Battery packs and electrical devices

Abstract

This application relates to a battery pack and electrical device, including a housing, an explosion-proof valve, a detection component, and an insulation detection circuit. The housing includes a separated electrical zone and a drainage zone, which are connected to allow liquid to flow from the drainage zone to the electrical zone. The explosion-proof valve is located in the housing and is arranged corresponding to the drainage zone. The drainage zone guides the liquid entering through the explosion-proof valve to the electrical zone. The detection component is located in the electrical zone and includes a current-carrying conductor electrically connected to the high-voltage circuit of the battery pack. When liquid is present in the electrical zone, the current-carrying conductor can electrically connect to the housing via the liquid. The insulation detection circuit is electrically connected to the housing and is used to detect the insulation condition of the housing to determine the presence of liquid in the electrical zone. The technical solution of this application helps improve the reliability of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery packs and electrical devices. Background Technology

[0002] To meet the demands of various vehicle operating conditions and fast charging, lithium battery packs often have very high charging and discharging power. This can lead to excessively high cell temperatures, potentially causing thermal runaway. To mitigate the impact of thermal runaway, two measures can be taken: firstly, a liquid cooling plate can be added to the bottom of the battery pack housing to cool the batteries; secondly, an explosion-proof valve can be installed on the housing. In the event of thermal runaway, the explosion-proof valve opens to release pressure, promptly discharging the high-pressure, high-heat gases generated by the runaway and preventing the battery pack from exploding and causing a more serious safety accident.

[0003] Due to factors such as machining precision or external impact, when water leaks from the explosion-proof valve into the box, the accumulated liquid can easily lead to insulation failure of electrical components in the electrical area of ​​the battery pack, reducing the reliability of the battery pack. Utility Model Content

[0004] Therefore, it is necessary to provide a battery pack and power device to address the problem that electrical components inside the battery pack are prone to insulation failure due to liquid.

[0005] In a first aspect, this application provides a battery pack, comprising:

[0006] The enclosure includes a separated electrical area and a drainage area, which are connected to each other to allow liquid to flow from the drainage area to the electrical area;

[0007] An explosion-proof valve is installed in the housing and arranged corresponding to the drainage area, which is used to guide the liquid entering from the explosion-proof valve to the electrical area;

[0008] A detection component, located in the electrical zone, includes a current-passing conductor electrically connected to the high-voltage circuit of the battery pack, the current-passing conductor being electrically connected to the housing via liquid when liquid is present in the electrical zone;

[0009] An insulation detection circuit, electrically connected to the enclosure, is used to detect the insulation condition of the enclosure in order to determine whether liquid is present in the electrical area.

[0010] In some embodiments, a reinforcing beam is provided in the drainage area. The reinforcing beam is arranged on the flow path of liquid from the explosion-proof valve along the drainage area to the electrical area, and forms a flow passage for liquid to flow through.

[0011] In some embodiments, the flow passage includes a flow groove disposed at the bottom of the reinforcing beam, and / or the flow passage includes a flow gap formed by the bottom of the reinforcing beam and the housing.

[0012] In some embodiments, the detection component includes an insulating base, the insulating base having a liquid storage cavity, and an inlet hole and a detection hole both communicating with the liquid storage cavity, the detection hole penetrating the bottom of the insulating base to allow liquid in the liquid storage cavity to contact the housing, and the overcurrent conductor being disposed inside the insulating base and extending into the liquid storage cavity;

[0013] The insulation detection circuit is used to detect the insulation condition of the enclosure in order to determine whether there is liquid in the liquid storage chamber.

[0014] In some embodiments, the detection assembly includes a Hall sensor, a power bus, and a connecting bus located inside the insulating base. The power bus passes through and supports the Hall sensor. Both ends of the power bus are electrically connected to the connecting bus and are electrically connected to the high-voltage circuit via the connecting bus.

[0015] The overcurrent conductor securely connects the overcurrent bus and the Hall sensor.

[0016] In some embodiments, the insulating base is provided with a mounting surface, an upper accommodating cavity and a lower accommodating cavity located on opposite sides of the mounting surface, one end of the lower accommodating cavity penetrating the mounting surface, and the other end opposite to it communicating with the liquid storage cavity;

[0017] A portion of the Hall sensor is housed in the upper cavity, and another portion is housed in the lower cavity. The power bus passes through the upper cavity and is mounted on the mounting surface.

[0018] In some embodiments, the insulating base includes a mounting hole located on the side of the mounting surface opposite to the upper accommodating cavity, the mounting hole penetrating the mounting surface, and both the power bus and the connecting bus are provided with connecting holes;

[0019] The detection component also includes a fixing fastener, which passes through the connection hole on the power busbar and the connection busbar and is fixedly installed in the mounting hole.

[0020] In some embodiments, the mounting hole extends through the bottom of the insulating base, and in the height direction of the insulating base, the distance from the fixing fastener to the housing is greater than the distance from the overcurrent conductor to the housing.

[0021] In some embodiments, a partition rib is provided in the liquid storage cavity, which divides the liquid storage cavity into an independent first sub-cavity and a second sub-cavity. The liquid inlet and the detection hole are both connected to the first sub-cavity, and the overcurrent conductor extends into the first sub-cavity.

[0022] A portion of the Hall sensor extends into the second sub-cavity.

[0023] In some embodiments, a support beam is provided at the bottom of the enclosure, the support beam is located in the electrical area, and the insulating base is fixedly installed on the support beam.

[0024] In some embodiments, a sealing ring is provided between the support beam and the insulating seat, the sealing ring being positioned opposite the detection hole and compressed between the insulating seat and the support beam.

[0025] In some embodiments, the insulating seat is provided with a positioning groove on the side facing the support beam, the positioning groove is directly opposite the detection hole, and the sealing ring is positioned in the positioning groove.

[0026] Secondly, this application provides an electrical device including the battery pack described in the first aspect.

[0027] Compared with the prior art, the present application has the following specific beneficial effects:

[0028] The aforementioned battery pack and electrical devices utilize a drainage area to divert liquid that abnormally seeps into the explosion-proof valve to the electrical zone. In the electrical zone, a detection component's overcurrent conductor transmits current to the enclosure when liquid is present, causing the enclosure to become energized and uninsulated. This allows the insulation detection circuit to detect the presence of liquid in the electrical zone, alerting personnel for timely maintenance and preventing insulation failure of electronic components, thus improving the battery pack's reliability. Furthermore, by diverting the abnormally seeping liquid from the explosion-proof valve to the electrical zone for detection, if the amount of liquid seeping is small and does not reach or significantly affect the insulation of electronic components in the electrical zone, the insulation detection circuit will not detect the liquid, eliminating the need for battery pack maintenance and reducing maintenance costs. Attached Figure Description

[0029] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0030] Figure 1 This is a partial structural diagram of a battery pack according to some embodiments.

[0031] Figure 2 for Figure 1 Another view of the battery pack shown.

[0032] Figure 3 This is a schematic diagram of the structure of the reinforcing beam in some embodiments.

[0033] Figure 4 for Figure 1A schematic diagram of a portion of the internal structure of the battery pack shown.

[0034] Figure 5 This is a schematic diagram of the internal structure of the detection component in some embodiments.

[0035] Figure 6 for Figure 4 Enlarged view of point A in the middle.

[0036] The reference numerals in the detailed embodiments are as follows:

[0037] 100. Battery pack; 10. Housing; q1. Electrical area; q2. Current diversion area; q3. Battery area; 11. Reinforcing beam; 11a. Flow passage; a1. Flow groove; 12. Support beam; 13. Frame; 14. Divider beam; 15. Base plate; 20. Explosion-proof valve; 30. Detection assembly; 31. Current conductor; 32. Insulating seat; 32a. Liquid storage chamber; 32b. Liquid inlet; 32c. Detection hole; 32d. Mounting ear; 32e. Seat; 32f. Cover; 32g. Positioning groove; 33. Hall sensor; 34. Current busbar; 35. Connecting busbar; m. Mounting surface; r1. Upper accommodating cavity;

[0038] r2, lower accommodating cavity; k1, mounting hole; k2, connecting hole; 36, fixing fastener; 37, partition rib; z1, first sub-cavity; z2, second sub-cavity; 38, fastening fitting; 40, sealing ring. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that, where they appear, the terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] Furthermore, where applicable, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral part; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] It should be noted that, if an element is described as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is described as "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0045] In response to the problems mentioned in the background art, this application provides a battery pack and an electrical device.

[0046] The battery pack in this embodiment can be applied to electrical devices to provide power to them. These devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, etc. Taking a vehicle as an example, the battery can be located at the rear, front, or bottom of the vehicle. The battery can provide power for the vehicle's drive system and also for its control system.

[0047] In this embodiment, the battery pack includes a BMS (Battery Management System) and multiple battery cells. These battery cells can be electrically connected in series, parallel, or a combination of both, and communicate with the BMS via signal acquisition components. The BMS controls and monitors the operating status of each battery cell. Alternatively, multiple battery cells can first be connected to a module management system via signal acquisition components to form a battery module. These battery modules can then be electrically connected in series, parallel, or a combination of both, and together with the BMS, form the battery pack.

[0048] The battery cell involved in the embodiments of this application is the smallest unit in which an electrochemical reaction takes place in a battery, and can be a secondary battery or a primary battery. The battery cell can be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell can be cylindrical, flat, cuboid, or other shapes.

[0049] In some embodiments, the battery cell includes a housing, an end cap, and an electrode assembly. The housing and the end cap together form an internal space for accommodating the electrode assembly. Specifically, a receiving cavity may be formed within the housing, with at least one end open. The end cap closes to the open end of the housing to seal the receiving cavity, and the electrode assembly is mounted within the receiving cavity. The housing may be, but is not limited to, a metal housing, such as an aluminum housing or a steel housing.

[0050] Electrode assemblies typically include a positive electrode, a negative electrode, and a separator separating the positive and negative electrodes. An electrolyte can be injected into the battery cell, wetting the interior of the electrode assembly and providing ion migration pathways for electrochemical reactions, as well as conducting electricity. Electrode assemblies can be in the form of wound, stacked, etc. One or more electrode assemblies can be installed within a single battery cell.

[0051] The battery pack in the embodiments of this application is described below.

[0052] Figure 1 This is a partial structural schematic diagram of a battery pack 100 according to some embodiments. Figure 2 for Figure 1 Another view of the battery pack 100 shown.

[0053] Please refer to Figure 1 and Figure 2The battery pack 100 of this embodiment includes a housing 10, an explosion-proof valve 20, a detection component 30, and an insulation detection circuit (not shown). The housing 10 includes a phase-separated electrical zone q1 and a drainage zone q2, which are connected to allow liquid to flow from the drainage zone q2 to the electrical zone q1. The explosion-proof valve 20 is disposed in the housing 10 and is arranged corresponding to the drainage zone q2. The drainage zone q2 is used to guide the liquid entering from the explosion-proof valve 20 to the electrical zone q1. The detection component 30 is disposed in the electrical zone q1 and includes a current-carrying conductor 31 electrically connected to the high-voltage circuit of the battery pack 100. The current-carrying conductor 31 can electrically connect to the housing 10 via the liquid when liquid is present in the electrical zone q1. The insulation detection circuit is electrically connected to the housing 10 and is used to detect the insulation condition of the housing 10 to determine whether liquid is present in the electrical zone q1.

[0054] The housing 10 forms a receiving space, which is divided into an electrical area q1, a current-guiding area q2, and a battery area q3. Individual battery cells are arranged in the battery area q3. Understandably, the electrical area q1 and the current-guiding area q2 are arranged adjacent to each other. In a specific example, the electrical area q1 and the current-guiding area q2 are arranged on the same side of the length direction of the housing 10, and adjacent to each other in the width direction of the housing 10, which is a relatively reasonable layout. In one example, referring to… Figure 2 The housing 10 includes a frame 13 and a base plate 15. The frame 13 is arranged to enclose the edge of the base plate 15. The partition beam 14 is arranged on the base plate 15 and divides the space enclosed by the frame 13 into an electrical area q1, a current-draining area q2 and a battery area q3.

[0055] Electrical zone q1 is used to house devices and components such as BMS and BDU (Battery Disconnection Unit) that are electronic devices used to monitor and control the operating status of individual battery cells within the battery pack 100. Typically, a heat exchange assembly for regulating the temperature of the individual battery cells is installed within this space. The heat exchange medium flowing within the heat exchange assembly can be a heating medium or a cooling medium. Optionally, the heat exchange assembly includes heat exchange plates arranged in both electrical zone q1 and battery zone q3, capable of exchanging heat not only with the individual battery cells in battery zone q3 but also with the electronic devices in electrical zone q1.

[0056] To improve the safety of the battery pack 100, the BMS of the battery pack 100 is generally equipped with an insulation detection circuit to detect the insulation status of the housing 10. The insulation detection circuit in the embodiments of this application can adopt a conventional solution or be uniquely designed.

[0057] The high-voltage circuit of the battery pack 100 refers to the high-voltage circuit formed by the electrical connection between the positive and negative terminals of the individual battery cells. Specifically, the high-voltage circuit can be formed by connecting the battery individual cells (BDU). The detection component 30 located in the electrical zone q1 includes a current-carrying conductor 31 electrically connected to the high-voltage circuit. That is, the individual battery cells supply current to the current-carrying conductor 31, causing it to become energized. The current-carrying conductor 31 is typically made of metal. The current-carrying conductor 31 can be connected to the high-voltage circuit between the BDU and the positive terminal of the individual battery cells, or to the high-voltage circuit between the BDU and the negative terminal of the individual battery cells.

[0058] An explosion-proof valve 20 is installed outside the housing 10 and corresponds to the drainage area q2, which is connected to the electrical area q1. When external liquid enters the drainage area q2 through the explosion-proof valve 20, it can then enter the electrical area q1, which is connected to the drainage area q2. If the heat exchange medium in the heat exchange assembly leaks, it may also enter the electrical area q1. Under normal circumstances, the current-carrying conductor 31 is spaced from the bottom wall of the housing 10 in the electrical area q1. When the liquid in the electrical area q1 reaches a certain level, the liquid comes into contact with the current-carrying conductor 31, transferring the current on the conductor 31 to the housing 10, making the housing 10 energized. The insulation detection circuit detects that the housing 10 is in a non-insulated state, thus determining that liquid exists in the electrical area q1.

[0059] The aforementioned battery pack 100, on the one hand, diverts the liquid abnormally seeping into the explosion-proof valve 20 to the electrical zone q1 through the diversion zone q2. When liquid is present in the electrical zone q1, the overcurrent conductor 31 of the detection component 30 at the electrical zone q1 transmits current to the housing 10, making the housing 10 energized and uninsulated. Thus, the insulation detection circuit can determine that liquid is present in the electrical zone q1, so as to alert the staff to perform timely maintenance and avoid insulation failure of electronic components in the electrical zone q1, which helps to improve the reliability of the battery pack 100.

[0060] On the other hand, the liquid that abnormally seeps into the explosion-proof valve 20 is diverted to the electrical area q1 for detection. When the amount of liquid seepage is small and cannot flow into or flows to the electrical area q1 in small quantities, and does not affect the insulation of the electronic components in the electrical area q1, the insulation detection circuit will not detect the presence of liquid in the electrical area q1, thus eliminating the need to maintain the battery pack 100 and reducing the maintenance cost of the battery pack 100.

[0061] In addition, the BMS of the battery pack 100 is generally equipped with an insulation detection circuit for detecting the insulation of the enclosure 10. When there is abnormal leakage at the explosion-proof valve 20, the existing insulation detection circuit of the battery pack 100 can be used to determine whether there is liquid in the electrical area q1 without setting up a new insulation detection circuit, thus reducing the configuration cost of the battery pack 100.

[0062] In some embodiments, refer to Figure 1 and Figure 2A reinforcing beam 11 is provided in the diversion zone q2. The reinforcing beam 11 is arranged on the flow path of the liquid self-explosion valve 20 from the diversion zone q2 to the electrical zone q1, and forms a flow passage 11a for the liquid to flow through.

[0063] Multiple reinforcing beams 11 can be arranged within the drainage zone q2. These reinforcing beams 11 are arranged sequentially along the flow path of the liquid self-explosion valve 20 from the drainage zone q2 to the electrical zone q1. Each reinforcing beam 11 has a flow passage 11a at its bottom for liquid to pass through, so that the infiltrated liquid can smoothly enter the electrical zone q1.

[0064] The reinforcement beam 11 serves two purposes. First, it strengthens the structure of the housing 10, improves the impact resistance of the drainage area q2, and prevents the drainage area q2 from deforming after an impact, thus hindering the smooth flow of the infiltrated liquid to the electrical area q1. Second, in practical applications, conductors forming the high-voltage circuit (including copper busbars, wires, etc.) can be routed through the drainage area q2 and supported on the reinforcement beam 11.

[0065] Figure 3 This is a structural schematic diagram of the reinforcing beam 11 in some embodiments. Specifically, it can be, as shown in... Figure 3 As shown, the flow passage 11a includes a flow passage groove a1 disposed at the bottom of the reinforcing beam 11. That is, a flow passage groove a1 is recessed in the bottom surface of the reinforcing beam 11, and the flow passage groove a1 can penetrate through the bottom of the reinforcing beam 11 along the arrangement direction of the current diversion area q2 and the electrical area q1 (such as the width direction of the housing 10) to realize flow passage. At this time, using the flow passage groove a1 to form the flow passage 11a not only simplifies the structure, but also simplifies the installation of the reinforcing beam 11 in the current diversion area q2.

[0066] Specifically, the flow passage 11a may include a flow gap formed by the bottom of the reinforcing beam 11 and the housing 10 spaced apart. In practical applications, the housing 10 is divided into an electrical area q1, a current-guiding area q2, and a battery area q3 by a partition beam 14 disposed inside. The bottom of the partition beam 14 can be glued to the bottom of the housing 10, while the bottom of the reinforcing beam 11 is glued to the housing 10 and forms a flow gap with intervals between them. The side of the reinforcing beam 11 is fixedly connected to the housing 10 or the partition beam 14. In this case, the flow passage 11a is formed by the bottom of the reinforcing beam 11 spaced apart from the housing 10, eliminating the need for a separate processing step to form the flow passage 11a, thus improving the production efficiency of the battery pack 100.

[0067] Figure 4 for Figure 1 A partial internal structure diagram of the battery pack 100 shown.

[0068] In some embodiments, refer to Figure 4The detection component 30 includes an insulating base 32, which has a liquid storage chamber 32a, an inlet hole 32b and a detection hole 32c, both of which are connected to the liquid storage chamber 32a. The detection hole 32c extends through the bottom of the insulating base 32 to allow liquid in the liquid storage chamber 32a to contact the housing 10. A current-carrying conductor 31 is disposed inside the insulating base 32 and seeps into the liquid storage chamber 32a. The insulation detection circuit is used to detect the insulation condition of the housing 10 to determine whether there is liquid in the liquid storage chamber 32a.

[0069] The insulating base 32 is insulating and is used to electrically insulate the overcurrent conductor 31 from the outside, improving the safety of the battery pack 100. When liquid seeps into the electrical zone q1, the liquid can enter the liquid storage chamber 32a through the liquid inlet 32b of the insulating base 32. The bottom of the liquid storage chamber 32a is connected to a detection hole 32c, and the liquid in the liquid storage chamber 32a can flow from the detection hole 32c to the surface of the housing 10, and then come into contact with the housing 10. The liquid inlet 32b is usually located on the side of the insulating base 32.

[0070] The overcurrent conductor 31 extends into the liquid storage cavity 32a, and is spaced a certain distance from the bottom of the liquid storage cavity 32a. When the liquid level in the liquid storage cavity 32a rises to contact the overcurrent conductor 31, the liquid will cause the overcurrent conductor 31 and the electrical conductor of the box 10 to become uninsulated.

[0071] At this time, the insulating seat 32 can not only electrically isolate the overcurrent conductor 31 and the outside to avoid safety hazards such as electric shock to the staff, but also enable the overcurrent conductor 31 to come into contact with the liquid that has seeped into the electrical area q1, so as to realize the detection and judgment of whether the liquid is present.

[0072] Figure 5 This is a schematic diagram of the internal structure of the detection component 30 in some embodiments.

[0073] In some embodiments, refer to Figure 4 and Figure 5 The detection assembly 30 includes a Hall sensor 33, a power bus 34, and a connecting bus 35 located inside the insulating base 32. The power bus 34 passes through and supports the Hall sensor 33. Both ends of the power bus 34 are electrically connected to the connecting bus 35, and are electrically connected to the high-voltage circuit via the connecting bus 35. The power conductor 31 securely connects the power bus 34 and the Hall sensor 33.

[0074] The overcurrent busbar 34 and the connecting busbar 35 can be metal busbars such as copper or aluminum. The overcurrent busbar 34 is connected to the high-voltage circuit of the battery pack 100 through the connecting busbars 35 at both ends to allow current to pass through. The Hall sensor 33 detects the magnitude of the current in the high-voltage circuit by measuring the magnetic field generated by the current flowing through the overcurrent busbar 34.

[0075] The overcurrent conductor 31 can be a bolt, pin, or other fastener that secures the overcurrent busbar 34 and the Hall sensor 33. It not only secures the two but also conducts electricity to the liquid in the liquid storage chamber 32a to detect the presence of liquid in the liquid storage chamber 32a. This achieves multiple benefits and reduces the number of parts in the detection assembly 30.

[0076] Furthermore, by integrating the Hall sensor 33 and the overcurrent bus 34 onto the insulating base 32, the Hall sensor 33 can be installed and current can be detected, making the insulating base 32 play a more significant role.

[0077] Further in the embodiments, refer to Figure 5 The insulating base 32 has a mounting surface m, an upper accommodating cavity r1 located on opposite sides of the mounting surface m, and a lower accommodating cavity r2. One end of the lower accommodating cavity r2 passes through the mounting surface m, and the other end is connected to the liquid storage cavity 32a. A portion of the Hall sensor 33 is housed in the upper accommodating cavity r1, and another portion is housed in the lower accommodating cavity r2. The busbar 34 passes through the upper accommodating cavity r1 and is mounted on the mounting surface m.

[0078] The upper accommodating cavity r1, the lower accommodating cavity r2, and the liquid storage cavity 32a are arranged sequentially in the vertical direction. The mounting surface m is usually a plane, and the power busbar 34 is usually a straight busbar that fits against the mounting surface m.

[0079] The upper accommodating cavity r1 houses the current busbar 34 and the Hall sensor 33. The current busbar 34 is mounted on the mounting surface m, and the mounting surface m provides support to the Hall sensor 33 through the current busbar 34, thus ensuring the stable installation of the Hall sensor 33. The internal space of the insulating base 32 below the mounting surface m is used to form the lower accommodating cavity r2 to accommodate the Hall sensor 33, which reduces the overall height of the insulating base 32 and reduces the space occupied by the insulating base 32 in the battery pack 100.

[0080] Specifically, you can refer to Figure 5 The insulating base 32 includes a base body 32e and a cover 32f. The upper end surface of the base body 32e forms a mounting surface m. The lower accommodating cavity r2, the liquid storage cavity 32a, and the detection hole 32c are all disposed on the base body 32e. The cover 32f is assembled on the upper side of the base body 32e and forms an upper accommodating cavity r1. When assembling the detection assembly 30, the cover 32f is first removed from the base body 32e. Then, the Hall sensor 33 is placed in the lower accommodating cavity r2. Next, the overcurrent busbar 34 passes through the Hall sensor 33 and is supported on the mounting surface m. The overcurrent conductor 31 is used to fasten the overcurrent busbar 34 to the Hall sensor 33 and extends the overcurrent conductor 31 into the liquid storage cavity 32a. Then, the overcurrent busbar 34 is fixedly connected to the connecting busbars 35 at both ends. Finally, the cover 32f is assembled on the base body 32e.

[0081] Optionally, the edge of the base 32e is provided with mounting ears 32d, and mounting ears 32d are provided with assembly holes. The insulating base 32 is fixedly connected to the housing 10 by fasteners passing through the assembly holes.

[0082] Further in the embodiments, refer to Figure 5 The insulating base 32 includes a mounting hole k1 located on the side of the mounting surface m opposite to the upper accommodating cavity r1, the mounting hole k1 penetrating the mounting surface m. Both the current bus 34 and the connecting bus 35 are provided with connecting holes k2. The detection assembly 30 also includes a fixing fastener 36, which is provided with connecting holes k2 on the current bus 34 and the connecting bus 35 and is fixedly installed within the mounting hole k1.

[0083] The base 32e has a mounting hole k1. The fastener 36 can be a screw, bolt, pin, etc., which passes through the connecting holes k2 on both the connecting busbar 35 and the current-carrying busbar 34 and is then fixedly installed in the mounting hole k1. If the fastener 36 is a screw or bolt, the mounting hole k1 has an internal thread that mates with it. If the fastener 36 is a pin, the mounting hole k1 can be a smooth hole with an interference fit. In a specific example, a fastening fitting 38 is installed in the mounting hole k1, and the fastener 36 is connected to the fastening fitting 38. When the fastener 36 is a threaded part, the thread is machined on the fastening fitting 38 before assembly into the mounting hole k1, which is simpler than directly installing the threaded part into the mounting hole k1.

[0084] At this time, the power bus 34 and the connecting bus 35 are fastened by the cooperation of the fastener 36 with the mounting hole k1. The solution is simple and easy to implement.

[0085] Optionally, the mounting hole k1 is a blind hole. In one specific embodiment, refer to... Figure 5 The mounting hole k1 penetrates the bottom of the insulating base 32, that is, the mounting hole k1 is a through hole, which not only makes it convenient to machine threads in the mounting hole k1, but also makes it convenient to install the threaded sleeve.

[0086] Furthermore, referring to Figure 5 In the height direction of the insulating base 32, the distance from the fixing fastener 36 to the housing 10 is greater than the distance from the current-carrying conductor 31 to the housing 10. That is, the bottom of the fixing fastener 36 is set higher than the bottom of the current-carrying conductor 31. Since the mounting hole k1 penetrates the bottom of the insulating base 32, the liquid in the electrical area q1 can seep into the mounting hole k1 from the bottom of the insulating base 32. The fixing fastener 36 is often made of metal, and when it comes into contact with the liquid in the mounting hole k1, it can easily cause the housing 10 to become electrified. At this time, the fixing fastener 36 is set higher than the current-carrying conductor 31, so when the current-carrying conductor 31 conducts electricity to the housing 10 through the liquid, the fixing fastener 36 will not be electrically connected to the housing 10, which can improve the detection reliability of the detection component 30. Moreover, the length of the fixing fastener 36 can be designed to be shorter, reducing costs.

[0087] In one specific embodiment, reference is made to Figure 5 A partition rib 37 is provided inside the liquid storage chamber 32a, which divides the liquid storage chamber 32a into an independent first sub-chamber z1 and a second sub-chamber z2. The liquid inlet hole 32b and the detection hole 32c are both connected to the first sub-chamber z1, and the current-carrying conductor 31 extends into the first sub-chamber z1. A portion of the Hall sensor 33 extends into the second sub-chamber z2.

[0088] Given the structural characteristics of the Hall sensor 33, when installed in the lower accommodating cavity r2, a portion of the Hall sensor 33 extends into the liquid storage cavity 32a. To prevent the liquid in the liquid storage cavity 32a from wetting the Hall sensor 33 and affecting its performance, a second sub-cavity z2 is created using a partition rib 37 to isolate the liquid from the Hall sensor 33, thereby improving the reliability of the Hall sensor 33. Simultaneously, the partition rib 37 also provides some support for the Hall sensor 33, making its installation more stable.

[0089] Moreover, the second sub-cavity z2 reduces the liquid-containing space in the liquid storage cavity 32a, and the liquid level in the first sub-cavity z1 rises faster, allowing the overcurrent conductor 31 to contact the liquid more quickly. This makes it possible to detect liquid seepage into the electrical area q1 earlier.

[0090] Figure 6 for Figure 4 Enlarged view of point A in the middle.

[0091] In some embodiments, combined with Figure 5 and Figure 6 It is understood that a support beam 12 is provided at the bottom of the enclosure 10, and the support beam 12 is located in the electrical area q1. The insulating seat 32 is fixedly installed on the support beam 12. A sealing ring 40 is provided between the support beam 12 and the insulating seat 32. The sealing ring 40 is positioned opposite the detection hole 32c and compressed between the support beam 12 and the insulating seat 32.

[0092] In practical applications, the electronic devices in electrical zone q1 can be mounted on the support beam 12, with the bottom surface of electrical zone q1 spaced apart, reducing the risk of insulation failure due to liquid immersion of the electronic devices.

[0093] The detection hole 32c connects the liquid storage chamber 32a to the support beam 12. The liquid in the liquid storage chamber 32a can contact the support beam 12 through the detection hole 32c. The support beam 12 and the box body 10 are made of the same material. When the support beam 12 is energized, the box body 10 is energized.

[0094] A sealing ring 40 is provided between the insulating base 32 and the support beam 12. Under the sealing effect of the sealing ring 40, the liquid in the liquid storage chamber 32a cannot flow to other areas of the bottom surface of the insulating base 32 through the detection hole 32c, thereby increasing the liquid level rise speed in the liquid storage chamber 32a and improving the detection accuracy of the detection component 30.

[0095] Specifically, you can refer to Figure 6 The insulating base 32 is provided with a positioning groove 32g on the side facing the support beam 12. The positioning groove 32g is positioned opposite the detection hole 32c. The sealing ring 40 is positioned in the positioning groove 32g.

[0096] The depth of the positioning groove 32g is less than the thickness of the sealing ring 40 before compression, so that the sealing ring 40 can be compressed between the insulating seat 32 and the support beam 12. The positioning groove 32g is used to position the sealing ring 40 and prevent the sealing ring 40 from shifting, which would lead to unreliable sealing.

[0097] In addition, this application provides an electrical device including the battery pack 100 in the above embodiments, the battery pack 100 being used to provide electrical energy.

[0098] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0099] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery pack (100), characterized by, include: The housing (10) includes a phase-separated electrical area (q1) and a drainage area (q2) connected to allow liquid to flow from the drainage area (q2) to the electrical area (q1); An explosion-proof valve (20) is provided in the housing (10) and is arranged corresponding to the drainage area (q2). The drainage area (q2) is used to guide the liquid entering from the explosion-proof valve (20) to the electrical area (q1). The detection component (30), located in the electrical zone (q1), includes a current-carrying conductor (31) that is electrically connected to the high-voltage circuit of the battery pack (100), and the current-carrying conductor (31) is electrically connected to the housing (10) via the liquid when there is liquid in the electrical zone (q1); An insulation detection circuit is electrically connected to the housing (10) and is used to detect the insulation status of the housing (10) to determine whether there is liquid in the electrical area (q1).

2. The battery pack (100) according to claim 1, characterized in that, A reinforcing beam (11) is provided in the drainage area (q2). The reinforcing beam (11) is arranged on the flow path of liquid from the explosion-proof valve (20) along the drainage area (q2) to the electrical area (q1), and forms a flow passage (11a) for liquid to flow through.

3. The battery pack (100) according to claim 2, characterized in that, The flow passage (11a) includes a flow groove (a1) disposed at the bottom of the reinforcing beam (11), and / or the flow passage (11a) includes a flow gap formed by the bottom of the reinforcing beam (11) and the housing (10).

4. The battery pack (100) of claim 1, wherein, The detection component (30) includes an insulating base (32), which is provided with a liquid storage chamber (32a), and a liquid inlet (32b) and a detection hole (32c) that are both connected to the liquid storage chamber (32a). The detection hole (32c) penetrates the bottom of the insulating base (32) to allow the liquid in the liquid storage chamber (32a) to contact the housing (10). The overcurrent conductor (31) is disposed inside the insulating base (32) and extends into the liquid storage chamber (32a). The insulation detection circuit is used to detect the insulation of the housing (10) to determine whether there is liquid in the liquid storage chamber (32a).

5. The battery pack (100) according to claim 4, characterized in that, The detection component (30) includes a Hall sensor (33), a power bus (34), and a connecting bus (35) located inside the insulating base (32). The power bus (34) passes through and supports the Hall sensor (33). Both ends of the power bus (34) are electrically connected to the connecting bus (35) and are electrically connected to the high-voltage circuit through the connecting bus (35). The overcurrent conductor (31) securely connects the overcurrent bus (34) and the Hall sensor (33).

6. The battery pack (100) according to claim 5, characterized in that, The insulating base (32) is provided with an installation surface (m), an upper accommodating cavity (r1) and a lower accommodating cavity (r2) located on opposite sides of the installation surface (m). One end of the lower accommodating cavity (r2) passes through the installation surface (m), and the other end opposite to it is connected to the liquid storage cavity (32a). Part of the Hall sensor (33) is housed in the upper cavity (r1), and another part is housed in the lower cavity (r2). The power bus (34) passes through the upper cavity (r1) and is mounted on the mounting surface (m).

7. The battery pack (100) according to claim 6, characterized in that The insulating base (32) includes a mounting hole (k1) located on the side of the mounting surface (m) opposite to the upper accommodating cavity (r1), the mounting hole (k1) penetrates the mounting surface (m), and the power bus (34) and the connecting bus (35) are both provided with connecting holes (k2); The detection component (30) further includes a fixing fastener (36), which passes through the connection hole (k2) on the power bus (34) and the connection bus (35) and is fixedly installed in the mounting hole (k1); The mounting hole (k1) penetrates the bottom of the insulating base (32). In the height direction of the insulating base (32), the distance from the fixing fastener (36) to the housing (10) is greater than the distance from the overcurrent conductor (31) to the housing (10).

8. The battery pack (100) of claim 5, wherein, The liquid storage cavity (32a) is provided with a partition rib (37), which divides the liquid storage cavity (32a) into an independent first sub-cavity (z1) and a second sub-cavity (z2). The liquid inlet (32b) and the detection hole (32c) are both connected to the first sub-cavity (z1). The current-carrying conductor (31) extends into the first sub-cavity (z1). A portion of the Hall sensor (33) extends into the second sub-cavity (z2).

9. The battery pack (100) of claim 4, wherein, The bottom of the housing (10) is provided with a support beam (12), the support beam (12) is located in the electrical area (q1), and the insulating seat (32) is fixedly installed on the support beam (12); A sealing ring (40) is provided between the support beam (12) and the insulating seat (32). The sealing ring (40) is positioned opposite the detection hole (32c) and compressed between the insulating seat (32) and the support beam (12). The insulating base (32) is provided with a positioning groove (32g) on ​​the side facing the support beam (12). The positioning groove (32g) is directly opposite the detection hole (32c). The sealing ring (40) is positioned in the positioning groove (32g).

10. An electrical device, characterized by Includes the battery pack (100) as described in any one of claims 1 to 9.

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