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 BYD Company Limited on March 14, 2022, for the invention entitled "Battery Tray Assembly, Battery Pack, and 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 a battery tray assembly, a battery pack, and a vehicle. [Background technology]

[0003] In the prior art, the battery pack tray is made of a composite material, which has good insulation properties similar to plastics and can play a good role in protecting the battery pack during its operation. However, if the battery pack body is poorly sealed and water seeps into the pack, or if the electrolyte in the battery leaks, or if condensed water is generated in the pack body and accumulates in the tray, the current leakage detector cannot detect the presence of a conductive medium in the tray. If the electrolyte or water puddle in the tray soaks the battery pack for a long period of time, the aluminum case of the cell will be electrolyzed, which will seriously affect the service life of the battery. If the aluminum case is electrolyzed to a certain extent, it will cause the aluminum case of the battery to be perforated and leak, which will lead to more serious safety accidents. Therefore, it is necessary to detect whether a conductive medium exists 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 objective of the present application is to provide a battery tray assembly that is provided with a conductive member and can timely warn a user of the presence of a conductive medium between the tray and the battery pack, thereby allowing the user to find it in time and avoid 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 forms a mounting space configured to accommodate a battery pack, and is insulated from the battery pack, the conductive member is provided on the tray and at least a portion is located within the mounting space, one end of the conductive member is connected to a predetermined potential point, when a conductive medium is not present in the mounting space, the conductive member provides 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 conducts electricity between 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, and the first potential signal and the second potential signal indicate 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, and 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 indicating the presence of a conductive medium in the mounting space to the vehicle. By using this battery tray assembly, problems such as battery leakage or the presence of water puddles 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 embodiment, the battery pack being disposed in the mounting space, a first potential signal being formed between the battery pack and the predetermined potential point when no conductive medium is present in the mounting space, and a second potential signal being formed 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 or not a conductive medium is present in the mounting space. Since the battery pack according to the present application has the battery tray, leakage of electricity due to water accumulation or electrolyte leakage in the battery pack can be detected in a timely manner, and safety is high.

[0010] The vehicle of the present application includes the battery pack of the above embodiment, and since the vehicle of the present application is provided 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 description of the drawings]

[0012] [Figure 1] FIG. 2 is a diagram illustrating the principle of detecting a conductive medium by a battery tray assembly according to an embodiment of the present application. [Diagram 2] FIG. 2 is an exploded view of a battery pack according to an embodiment of the present application. [Diagram 3] FIG. 2 is a diagram showing a tray structure according to an embodiment of the present application. [Figure 4] FIG. 4 is a proportional diagram of the width of a cell and a conductive member according to an embodiment of the present application. [Diagram 5] 4 is a diagram showing the fitting of a conductive member and a tray according to an embodiment of the present application. FIG. [Figure 6] FIG. 2 is a cross-sectional view of a conductive fastener, a conductive member, and a lug according to an embodiment of the present disclosure 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 PREFERRED EMBODIMENTS

[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 illustrative and are only for interpreting the present application, and should not be understood as limiting the present application.

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

[0015] As shown in Fig. 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 to provide 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 specified potential point may generally be 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, and another conductive structure may be connected to one end of the conductive member 130, and the other conductive structure may connect the conductive member 130 to the specified potential point, or the conductive member 130 may be provided on the tray 110, and a part of the conductive member 130 may be provided within the mounting space 110a, and another part of the conductive member 130 may extend outside the mounting space 110a and be connected to the specified potential point, and this is not limited here.

[0016] In some embodiments, the battery pack 200 is provided on the tray 110, and the conductive member 130 is further provided on the tray 110. The battery pack has a battery management system, and the battery management system 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, so that the battery management system can detect a potential difference between the battery pack 200 and the conductive member 130. The conductive medium can pass a current, and when the conductive medium is not present in the mounting space 110a, the battery pack 200 and the conductive member 130 are disconnected, and the battery management system detects a potential difference between the battery pack 200 and the conductive member 130, i.e., a potential difference between the battery pack 200 and the predetermined potential point, and this potential difference is a potential difference during normal operation of the battery, and the battery management system converts the potential difference during normal operation of the battery into a first potential signal. 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. When a conductive medium is present in the mounting space 110a, the conductive medium is located between the assembled battery 200 and the tray 110, and the assembled battery 200, the conductive medium, the conductive member 130, and the predetermined potential point together form a current path, in which case the potential difference between the assembled battery 200 and the conductive member 130 detected by the battery management system changes due to the presence of the conductive medium, and this potential difference is the potential difference at the time of 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 in a battery pack having a battery management system, it is possible to detect the potential difference between the assembled battery 200 and the predetermined potential point, thereby determining whether or not a conductive medium is present in the battery pack.

[0017] In some other embodiments, in order to ensure that the battery pack does not leak electricity during normal operation, the tray 110 and the assembled battery 200 should be insulated to break the circuit; the insulating tray 110 is provided with a conductive member 130 capable of conducting electricity 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, and a potential difference is formed 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 further reports related information to the vehicle to warn the user, thereby avoiding the occurrence of a safety accident 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 puddle of water accumulated on the tray 110 contains conductive positive and negative ions, or other media capable of electrically connecting the battery pack 200 and the conductive member 130.

[0018] In the battery tray assembly 100 of the present application, the conductive member 130 is added 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 indicating the presence of a conductive medium in the mounting space 110a to the vehicle. By using the battery tray assembly 100, problems such as battery leakage or the presence of water puddles 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, and 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 of the battery tray assembly 100.

[0022] According to some embodiments of the present application, the tray 110 includes a ground member, the ground member is provided to be grounded, and one end of the conductive member 130 is electrically connected to the ground member. In some embodiments, the ground member is grounded, the potential of the ground member is zero, and the conductive member 130 is at the same potential as the vehicle ground through the ground 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, and 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 through the ground member.

[0023] According to some embodiments of the present application, as shown in Fig. 3, a plurality of conductive members 130 are provided on both sides of the tray 110 along the first direction, and the conductive members 130 are spaced apart from each other along the second direction, and the first direction and the second direction are perpendicular to each other. In some embodiments, the conductive members 130 are configured in a plurality of parts, and the plurality of conductive members 130 are distributed on both sides of the tray 110 at a distance from each other. When a conductive medium is present in the tray 110, the conductive medium flows due to the running of the vehicle. When the conductive medium flows between the conductive member 130 and the assembled battery 200, the conductive medium conducts a circuit between the assembled battery 200 and a predetermined potential point to form a potential difference. The battery management system detects the potential difference and converts it into a second potential signal, and when there is a change between the first potential signal and the second potential signal, the battery management system uploads the second potential signal to the vehicle to notify the user that a leakage current has occurred. The plurality of conductive members 130 provided in a distributed manner can improve the probability of detecting the conductive medium, and safety is better.

[0024] According to some embodiments of the present application, as shown in Fig. 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 has an elegant design, is easy to process, and has a high probability of detecting the conductive medium, thereby 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, and 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, and S2 and S satisfy 0.15 < S2 / S < 0.35. Since the distances at which the conductive medium reaches the two conductive members are close, when the conductive medium flows in the tray 110, it is easy to detect the presence of the 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 is configured as an insulating member on which the assembled battery 200 is placed, and the frame 112 is provided on the outer periphery of the bottom plate 111, and the frame 112 is configured as a grounded member. In some embodiments, the bottom plate 111 of the tray 110 forms an installation space 110a for accommodating the assembled battery 200, and the frame 112 is provided on the outer periphery of the bottom plate 111, and the frame 112 is provided in a grounded state and fixedly connected to the bottom plate 111. The frame 112 may be configured as a metal member, which can improve the rigidity of the tray 110 and can be connected to a vehicle body via a ground 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 a fixing point for connecting the battery tray to the vehicle body is provided on the lug 120, and the conductive member 130 can conduct between the lug 120 and the battery pack 200 when a conductive medium exists in the mounting space 110a. In some embodiments of the present application, the lug 120 is made of a metal material and can be conductive 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 portion of the conductive member 130 is provided within the mounting space 110a, and another portion 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 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 contacts and electrically connects with the lugs 120, 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 part of the conductive sheet is located on the bottom plate 111, a part of the conductive sheet is adjacent to or located within the mounting space 110a, and another part of the conductive sheet extends to the support protrusion 111a, and the conductive bolt penetrates the support protrusion 111a and is pressed against the other part of the conductive sheet, and then the conductive bolt is 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 the mounting space 110a or located 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 realize grounding.

[0031] 7, the bottom plate 111 includes a bottom plate body 1111, a side plate 1112, and a flange portion 1113. The side plate 1112 is provided on the outer periphery of the bottom plate body 1111 and defines a mounting space 110a for the battery pack together with the bottom plate body 1111. 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. The flange portion 1113 has a supporting 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 define the mounting space 110a, the flange portion 1113 extends along the outer edge of the side plate 1112 in a direction away from the mounting space 110a, a part of the conductive member 130 is provided on the bottom plate body 1111, and another part of the conductive member 130 extends along the side plate 1112 to the flange portion 1113 and contacts the supporting protrusion. The structure of the bottom plate 111 is set in this way, which makes it easy to place the battery and attach the conductive member 130.

[0032] According to some embodiments of the present application, as shown in Fig. 7, the frame 112 includes a front beam 1123, a rear beam 1124, and a side beam 1120, the front beam 1123 and the rear beam 1124 are fixed to the front and rear sides of the side beam 1120, respectively, and the side beam 1120 is configured in two, and each is connected to the end of the same side of the front beam 1123 and the rear beam 1124. The side beam 1120 includes an outer support part 1121 and an inner support part 1122, the outer support part 1121 is configured to support the flange part 1113, the height of the inner support part 1122 is smaller than the height of the outer support part 1121, the inner support part 1122 is located on the side facing the mounting space 110a of the outer support part 1121, and the inner support part 1122 is configured to support the bottom plate body 1111. In some embodiments, the front beam 1123 is provided at the front side of the bottom plate 111, the rear beam 1124 is provided at the outer periphery of the flange portion 1113 at the rear side of the bottom plate 111, the outer support portion 1121 and the 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, the inner support portion 1122 supports the bottom plate body 1111, the outer support portion 1121 is higher than the inner support portion 1122, and the height difference between the flange portion 1113 and the bottom plate body 1111 is formed to define the mounting space 110a of the battery. By providing the inner support portion 1122 and the outer support portion 1121, the load-bearing capacity of the bottom plate 111 can be improved, the rigidity of the bottom plate 111 can be increased, and deformation of the bottom plate 111 can be avoided.

[0033] In some embodiments of the present application, the bottom plate 111 and the frame 112 are bonded together with a structural adhesive, and the dimensional tolerance of the frame 112 can be absorbed by controlling the thickness of the structural adhesive. In addition, the frame 112 has good flatness, and the manufacturing accuracy of the frame 112 and the bottom plate 111 can be reduced by utilizing the feature that the structural adhesive can absorb the dimensional tolerance.

[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 away 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 entire pack becomes, and the greater the probability of resonance occurrence. The cross-sectional area S2 of the hollow cavity 1121a provided away 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 away 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 entire 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 out cavity 1121a adjacent to the inner support part 1122 is triangular, and the two angles defined by the inner side wall of the outer support part 1121 and the hollowed out cavity 1121a are α and β, respectively, and both angles of α and β are within a range of 50° to 70°, and are set to values ​​such that the cross section of the hollowed out cavity 1121a is an isosceles triangle, thereby improving the stability of the cross section of the hollowed out 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 tank is formed in the inner support 1122. In some embodiments, the water tank 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 tank and is temporarily stored therein, and the water tank absorbs or discharges the conductive medium, thereby reducing the conductive medium inside the battery pack, reducing the risk of the inside of the battery pack being leaked due to the conductive medium, and improving the safety of the battery pack.

[0039] According to some embodiments of the present application, as shown in Figures 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, and a part of the conductive member 130 is the bottom wall of the mounting space 110a, and another part of the conductive member 130 extends from the bottom plate 111 and contacts the frame 112 to be grounded. In some embodiments of the present application, the conductive member 130 may be thermocompressed to the bottom plate 111 by a hot pressing method to form a conductive path.

[0040] According to some embodiments of the present application, as shown in Figs. 5 and 6, a 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 the conductive fastener 140 fastens the tray 110 and the conductive member 130. In some embodiments, the conductive fastener 140 is conductive, and there is an electrical connection between the conductive member 130 and the conductive fastener 140, and the conductive fastener 140 fixes another 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 is formed with a first mounting hole configured to pass the conductive fastener 140, the tray 110 is formed with a second mounting hole configured to pass the conductive fastener 140, the first mounting hole and the second mounting hole are opposite each other, the conductive fastener 140 is provided to pass through the first mounting hole and the second mounting hole, respectively, and is grounded, and a pressing portion having a cross section larger than the first mounting hole is formed at the upper end of the conductive fastener 140, 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, in order to facilitate the conductive member 130 contacting the conductive medium in the mounting space 110a, a portion of the conductive member 130 is provided within the mounting space 110a and spaced apart from the assembled battery 200, or, in order to facilitate the conductive member 130 contacting 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 is raised or protruding to contact the conductive medium in the mounting space 110a, and the raised or 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, facilitating the conductive member 130 to contact the conductive medium in the mounting space 110a.

[0042] In some embodiments of the present application, as shown in Fig. 3, the ground member is fixedly connected to the tray 110, and another part of the conductive member 130 extends from the tray 110 and is connected to the ground member. In some embodiments, the part of the tray 110 on which the assembled battery 200 is placed is insulated and cannot be conductive, and another part of the conductive member 130 extends from the mounting space 110a of the tray 110 and is connected to the ground member, and the ground member is a predetermined potential point, so that 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 of the mounting space 110a to the outside of the tray 110, and when a conductive medium is present in the mounting space 110a, the assembled battery 200, the conductive member 130, and the predetermined potential point are electrically connected to each other, and the potential difference between the assembled battery 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, the lug 120 is formed on the outer periphery of the frame 112, and 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 provided in the installation space 110a, and the conductive member 130 is thermocompressed to the bottom plate 111 by a hot pressing method to form a conductive path. The bottom plate 111 includes a bottom plate main body 1111, a side plate 1112 and a flange portion 1113, the flange portion 1113 is higher than the bottom plate main body 1111, the side plate 1112 is inclined to connect the bottom plate main body 1111 and the flange portion 1113, a support protrusion 111a is formed on the outer periphery of the flange portion 1113, the conductive member 130 extends to the support protrusion 111a, and a second mounting hole is formed in the support protrusion 111a. The frame 112 includes a front beam 1123, a rear beam 1124, and a side beam 1120. The side beam 1120 includes an outer support part 1121 and an inner support part 1122. The outer support part 1121 supports the flange part 1113. The inner support part 1122 supports the bottom plate body 1111. Two hollow cavities 1121a are formed in the outer support part 1121. A water tank and a support groove 1122a are formed in the inner support part 1122. The conductive member 130 has a first mounting hole at a portion that contacts the supporting protrusion 111a, a third mounting hole is formed in the lug 120, and the conductive fastener 140 penetrates the three mounting holes to mount and electrically connect the conductive member 130 and the lug 120 of the tray 110. The conductive member 130 draws the potential of the mounting space 110a to the lug 120, forming an equipotential body. The multiple conductive members 130 are evenly 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] When no conductive medium exists in the mounting space 110a, the battery management system detects the potential difference between the assembled battery 200 and a predetermined potential point and converts it into a first potential signal. When a conductive medium exists in the mounting space 110a, the conductive medium flows due to the running of the vehicle, and when the conductive medium flows between the conductive member 130 and the assembled battery 200, the conductive medium conducts the circuit between the assembled battery 200 and the conductive member 130 to form a new potential difference, and the battery management system detects the change in the potential difference, converts the changed potential difference into a second potential signal, detects when there is a change between the first potential signal and the second potential signal, uploads it to the vehicle, and finally notifies that there is a conductive medium inside the battery and there is a possibility of leakage, and 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 according to any one of the above-mentioned embodiments, the battery pack 200 is provided in the mounting space 110a, and when no conductive medium is present in the mounting space 110a, a first potential signal is formed between the battery pack 200 and a 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. In some embodiments, the battery tray forms a mounting space 110a for mounting the battery pack 200, and when no conductive medium is present in the battery pack, a first potential signal is formed between the battery pack 200 and a predetermined potential point, and 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, a potential difference between the battery pack 200 and the predetermined potential point changes, and a second potential signal is formed, and both the first potential signal and the second potential signal can be transmitted to the vehicle, and by determining that there is a change in the potential signal, it is possible to know whether or not a conductive medium is present in the battery pack. Since the battery pack of the present application has the above-mentioned battery tray, it is possible to timely find the occurrence of leakage due to water accumulation or electrolyte leakage in the battery pack, and safety is high.

[0048] According to some embodiments of the present application, as shown in Figures 2-3, the battery pack further includes a battery management system. The battery management system detects a potential signal between the assembled battery 200 and a predetermined potential point to detect 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 assembled battery 200 and the predetermined potential point changes compared with the first potential signal, that is, a second potential signal is formed. The battery management system detects this change and transmits it to the vehicle, so that the user can timely find that the battery pack is leaking due to water accumulation or electrolyte leakage inside.

[0049] According to some embodiments of the present application, as shown in FIGS. 2 to 3, the battery pack 200 includes a plurality of single cells 210, the plurality of single cells 210 are arranged at intervals in the second direction, and the conductive member 130 is arranged opposite to 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 a short circuit by conducting two cells 210, by providing one conductive member 130 to face one cell 210, the safety of the battery pack 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 battery pack 200 in the second direction 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 cause a 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 in the battery pack 200 is charged, or the battery pack 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 electricity, 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 larger 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 a potential difference between the battery pack 200 and the ground member, and the battery management system converts the potential difference into a first potential signal and transmits it 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 both ends of the conductive medium resistance R1 and the conductive member resistance R2, and 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] The vehicle 1 according to the present application will be briefly described below.

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

[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 puddles 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, which improves the probability of detecting a conductive medium inside the vehicle 1 while it is moving, and ensures 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, which makes 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; and the battery tray assembly 100 is provided with a water tank, which can temporarily store the conductive medium in the battery pack, thereby preventing leakage of electricity in the battery pack, and improving the safety of the battery pack.

[0057] In the description of this specification, a description that refers to the terms "one embodiment," "some embodiments," "exemplary embodiments," "examples," "particular examples," or "some examples" means 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 of this specification, 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 objectives 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 Support protrusion 1111 Bottom plate body 1112 Side plate 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 pack 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), wherein the first potential signal and the second potential signal indicate the presence or absence of a conductive medium 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. 3. The battery tray assembly (100) of claim 1 or 2, wherein the tray (110) includes a grounding member, the grounding member being provided at a ground, and one end of the conductive member (130) is electrically connected to the grounding member.

4. The battery tray assembly (100) of any one of claims 1 to 3, characterized in that a plurality of conductive members (130) are provided on both sides of the tray (110) in a 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 any one of claims 1 to 4, wherein a 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 from each other in a second direction of the tray (110), The battery tray assembly (100) of any one of claims 1 to 5, characterized in that a length of the tray (110) in the second direction is S, a distance between the first conductive member (130) and one end of the tray (110) is S1, and a distance between the second conductive member (130) and the other end of the tray (110) is S2, satisfying 0.15<S1 / S<0.35 and 0.15<S2 / S<0.

35.

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) of any one of claims 1 to 6, characterized in that 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. The battery tray assembly (100) of any one of claims 1 to 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, and the conductive member (130) being connected to the lug (120).

9. The battery tray assembly (100) of any one of claims 1 to 8, characterized in that 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) is The base plate includes a bottom plate body (1111), a side plate (1112), and a flange portion (1113), The side plate (1112) is provided on the outer periphery of the bottom plate body (1111) and defines an installation space (110a) for the battery pack (200) together with the bottom plate body (1111); A battery tray assembly (100) as described in any one of claims 1 to 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 a side beam (1120); The front beam (1123) and the rear beam (1124) are provided opposite each other, The side beam (1120) is configured in two pieces, each of the side beams (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 any one of claims 1 to 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 main body (1111).

12. A battery tray assembly (100) as described in any one of claims 1 to 11, characterized in that a plurality of hollowed-out cavities (1121a) extending in the front-to-rear direction are formed within the outer support portion (1121), and the side walls between two adjacent hollowed-out cavities (1121a) are provided at an incline.

13. A battery tray assembly (100) as described in any one of claims 1 to 12, 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 on the underside of the bottom plate (111).

14. The battery tray assembly (100) of any one of claims 1 to 13, characterized in that a water reservoir is formed in the inner support portion (1122).

15. The battery tray assembly (100) according to any one of claims 1 to 14, characterized in that the conductive member (130) is integral with the bottom plate (111).

16. The battery tray assembly (100) of any one of claims 1 to 15, characterized in that the tray (110) is an insulating member, the battery tray assembly (100) further includes a conductive fastener (140), the conductive fastener (140) is 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 no conductive medium is 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, the battery management system detecting 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. 19. The battery pack according to claim 17 or 18, characterized in that the assembled battery (200) includes a plurality of unit cells (210), and the conductive member (130) is arranged opposite one of the unit cells (210) in a first direction of the battery tray.

20. The battery pack according to any one of claims 17 to 19, characterized in that a width in the second direction of a single cell (210) in the battery pack (200) is W1, a width in the second direction of the conductive member (130) is W2, and 0.25<W2 / W1<0.98 is satisfied.

21. The case of the unit cell (210) in the battery pack (200) is charged, or The battery pack according to any one of claims 17 to 20, characterized in that the assembled battery (200) is provided with a post pull-out member, the post pull-out 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 any one of claims 17 to 21.

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