Relay and battery pack

Abstract

The utility model discloses a relay and a battery pack, and relates to the technical field of batteries. The relay comprises a shell, an output terminal and a heating piece, the shell is provided with a containing cavity, the output terminal penetrates through the shell, at least part of the output terminal extends into the containing cavity, a groove is formed in the cavity wall of the containing cavity, at least part of the groove surrounds the output terminal, the heating piece is arranged in the groove, and at least part of the circumferential direction of the output terminal is wrapped with the heating piece. The heating element is used for heating the output terminal; therefore, the heating element is stably arranged in the groove on the shell of the relay to heat the output terminal of the relay, so that the output terminal is prevented from being condensed in a humid and cold environment, the insulating property of the relay is improved, the corrosion of condensate water to elements in the relay is reduced, and the safety performance of the relay is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a relay and a battery pack. Background Technology

[0002] Temperature has a significant impact on battery health; both excessively high and low temperatures can negatively affect battery performance and lifespan. Especially in low-temperature environments, the activity of the battery electrolyte decreases, leading to a reduction in charge and discharge efficiency. Therefore, temperature compensation structures are typically used to control battery temperature.

[0003] However, in cold and humid regions, water vapor can easily condense inside the battery in alternating hot and cold environments. This is especially true for relays with a temperature compensation structure, as their metal terminals and internal metal parts have high thermal conductivity. When the temperature is low, they can cool down rapidly and condense on the surface, which reduces the insulation performance of the relay. Furthermore, the condensate can corrode the internal components of the relay, reducing its safety performance. Utility Model Content

[0004] This application aims to provide a relay and battery pack that can solve the problem in related technologies where relays in temperature-compensating structures are prone to condensation in cold and humid environments, reducing the insulation and safety performance of the relays.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a relay, comprising: a housing, an output terminal, and a heating element. The housing has a receiving cavity, the output terminal passes through the housing, and at least a portion of the output terminal extends into the receiving cavity. The cavity wall of the receiving cavity has a groove, at least a portion of which surrounds the output terminal. The heating element is disposed in the groove and covers at least a circumferential portion of the output terminal. The heating element is used to heat the output terminal.

[0007] Optionally, a plurality of output terminals are provided, and the plurality of output terminals are spaced apart on the housing, with each output terminal covered by the heating element.

[0008] Optionally, the relay further includes an electrical connector that passes through the housing. One end of the electrical connector is electrically connected to a plurality of the heating elements, and the other end of the electrical connector is adapted to be electrically connected to a power source to energize the plurality of heating elements.

[0009] Optionally, it further includes a filler material layer disposed within the groove, wherein the heating element is at least partially embedded in the filler material layer.

[0010] Optionally, it further includes a thermally conductive adhesive layer, which is disposed between the heating element and the output terminal, and is used for bonding and heat conduction between the heating element and the output terminal.

[0011] Optionally, the heating element is an electric heating film.

[0012] Optionally, the heating power P of the heating element satisfies: 0.1 W / cm² 2 ≤P≤1W / cm 2 .

[0013] Secondly, embodiments of this application provide a battery pack including: any of the relays described above.

[0014] Optionally, the battery pack further includes a battery module, a control module, and a temperature sensor. The battery module is electrically connected to the heating element, the control module is electrically connected to both the battery module and the heating element, and the temperature sensor is electrically connected to the control module. The temperature sensor is used to sense the temperature inside the battery pack, and the control module is used to control the connection between the battery module and the heating element based on the temperature.

[0015] Optionally, it also includes a resistance heating film, wherein the resistance heating film and the relay are electrically connected to the battery module, the resistance heating film is thermally connected to the battery module, the resistance heating film is used to heat the battery module, and the relay is used to control the on / off connection between the resistance heating film and the battery module.

[0016] In the embodiments of this application, the relay includes a housing, an output terminal, and a heating element. The housing has a receiving cavity, the output terminal passes through the housing, and at least a portion of the output terminal extends into the receiving cavity. The cavity wall has a groove, at least a portion of which surrounds the output terminal. The heating element is disposed in the groove and covers at least a circumferential portion of the output terminal. The heating element is used to heat the output terminal. In this way, the heating element is stably installed in the groove on the housing of the relay to heat the output terminal of the relay, thereby preventing condensation of the output terminal in a humid and cold environment, improving the insulation performance of the relay, and reducing the corrosion of internal components by condensate, thereby improving the safety performance of the relay.

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

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of a relay according to an embodiment of this application;

[0020] Figure 2 This is a partial structural schematic diagram of a relay according to an embodiment of this application;

[0021] Figure 3 According to the embodiments of this application, along Figure 1 Sectional view of line AA in the middle;

[0022] Figure 4 According to the embodiments of this application, along Figure 1 Sectional view of the middle BB line;

[0023] Figure 5 This is a partial schematic diagram of a battery pack according to an embodiment of this application.

[0024] Figure label:

[0025] 1: Relay; 11: Housing; 111: Receiving cavity; 1111: Groove; 1112: Filling material layer; 12: Output terminal; 13: Heating element; 14: Electrical connector; 2: Control module. Detailed Implementation

[0026] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] Before explaining the relays and battery packs provided in the embodiments of this application, the application scenarios of the relays and battery packs provided in the embodiments of this application will be specifically described:

[0031] Currently, in the field of battery technology, a heating circuit is typically incorporated into battery packs to heat the battery modules and ensure normal output in low-temperature environments. This heating circuit generally consists of a relay 1, a fuse, and a resistance heating film. In low-temperature environments, the control unit closes the relay, energizing the resistance heating film to heat the battery modules. However, in cold and humid regions, due to high humidity, the alternating hot and cold temperatures within the relay 1 can lead to condensation on its output terminals 12 and its interior. Condensation on the output terminals 12 reduces the insulation performance of the relay 1 and can corrode its internal components, increasing friction in the actuator and potentially causing jamming, thus reducing the relay 1's performance and safety.

[0032] Therefore, this application provides a relay and a battery pack. The relay and battery pack provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0033] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a relay 1 according to some embodiments of this application includes: a housing 11, an output terminal 12, and a heating element 13. The housing 11 has a receiving cavity 111. The output terminal 12 passes through the housing 11, and at least a portion of the output terminal 12 extends into the receiving cavity 111. The cavity wall of the receiving cavity 111 has a groove 1111, and the groove 1111 at least partially surrounds the output terminal 12. The heating element 13 covers at least a circumferential portion of the output terminal 12 and is used to heat the output terminal 12.

[0034] In this embodiment, the heating element 13 is stably installed in the groove 1111 on the housing 11 of the relay 1 to heat the output terminal 12 of the relay 1, thereby preventing condensation of the output terminal 12 in a humid and cold environment, improving the insulation performance of the relay 1, and reducing the corrosion of the internal components of the relay 1 by condensate, thereby improving the safety performance of the relay 1.

[0035] In specific applications, relay 1 is an electromagnetic relay, which can be at least one of a current relay, a voltage relay, or an intermediate relay. Those skilled in the art can configure it according to actual needs, and this application does not impose any restrictions on it.

[0036] It should be explained that the output terminal 12 is a terminal used for electrical connection, specifically referring to the metal terminal in the relay 1 that functions as a normally open contact, normally closed contact, and changeover contact. Heating the output terminal 12 by the heating element 13 can reduce the possibility of condensation forming on the output terminal 12. The output terminal 12 passes through the housing 11, and at least a portion of the output terminal 12 extends into the receiving cavity 111. For example, a portion of the output terminal 12 may be exposed outside the housing 11, while another portion extends into the receiving cavity 111.

[0037] In practical applications, in addition to the housing 11 and the output terminal 12, the relay 1 also includes a main body. The main body uses an internal actuator to connect or disconnect the output terminal 12 based on the control signal, so as to connect or disconnect the circuit in which the relay 1 is located. Generally speaking, the input circuit in the main body is used to receive the control signal, and the actuator is used to drive the output terminal 12 to make a corresponding displacement. Both the input circuit and the actuator are set inside the housing 11.

[0038] Understandably, since the output terminals 12 are mostly metal terminals with high thermal conductivity, when the relay 1 is in a humid and cold region, the output terminals 12 are prone to cooling down to below the dew point temperature of the surrounding air. This can lead to condensation forming on the output terminals 12 before and after energization, thereby reducing the insulation performance of the relay 1 or causing corrosion of the output terminals 12. The dew point temperature refers to the temperature at which air reaches saturation under constant water vapor content and pressure.

[0039] Specifically, the heating element 13 covers at least a portion of the circumferential direction of the output terminal 12, such as... Figure 2 As shown, specifically, the heating element 13 covers the part of the output terminal 12 that is not electrically connected, so that while heating the output terminal 12, it does not affect the normal use of the output terminal 12. The heating element 13 can be attached to one side of the output terminal 12 or wrapped around the outer periphery of the output terminal 12, etc., as long as heat can be transferred to the output terminal 12 and condensation is prevented from forming on the output terminal 12.

[0040] Understandably, the heating element 13 can be at least one of the following: heating wire, PTC (Positive Temperature Coefficient) heating element, conductive coating, heating film, electromagnetic coil, etc. Those skilled in the art can make the settings according to actual needs, and this application does not limit it.

[0041] Understandably, by providing a groove 1111 on the cavity wall of the receiving cavity 111 of the housing 11, the heating element 13 can be stably installed in the groove 1111, thereby improving the stability of the heating element 13 and thus improving the reliability and safety of the relay 1.

[0042] In specific applications, such as Figure 3 and Figure 4 As shown, part of the output terminal 12 extends out of the housing 11 to connect with external components, and the other part extends into the receiving cavity 111 to connect with the internal components of the relay 1. A groove 1111 is provided on the cavity wall of the receiving cavity 111 of the housing 11, so that the housing 11 can protect and insulate the heating element 13 in the groove 1111.

[0043] Understandably, the number of recesses 1111 corresponds to the number of output terminals 12, for example: Figure 3 and Figure 4 As shown, there are 4 output terminals 12, and therefore 4 grooves 1111.

[0044] It should be explained that the depth of the groove 1111 depends on the thickness of the housing 11, which is sufficient to ensure the installation of the heating element 13 and that the heating element 13 can heat the output terminal 12.

[0045] Specifically, the groove 1111 at least partially surrounds the output terminal 12. The output terminal 12 may extend from the middle of the groove 1111, and the heating element 13 may be disposed in the groove 1111 and surround the circumferential surface of the output terminal 12. Alternatively, the groove 1111 may surround one side of the output terminal 12, and the heating element 13 may be disposed in the groove 1111 and contact one side of the output terminal 12, thereby heating the output terminal 12. Of course, the specific form of the groove 1111 is sufficient to heat the output terminal 12 when the heating element 13 is installed therein. Those skilled in the art can make the setting according to actual needs, and this application does not limit it in this regard.

[0046] In some embodiments of this application, the relay 1 further includes a mounting component, which is fixedly connected to the housing 11 or the output terminal 12, and the heating element 13 is disposed within the mounting component. Thus, the heating element 13 is fixedly installed using an independent mounting component, ensuring the stability of the heating element 13.

[0047] Specifically, the heating element 13 can be fixed by the groove 1111 on the housing 11 or by the mounting part. The specific form can be set by those skilled in the art according to actual needs, and this application does not limit it.

[0048] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments of this application, multiple output terminals 12 are provided, and the multiple output terminals 12 are spaced apart on the housing 11, with each output terminal 12 covered by a heating element 13.

[0049] In this embodiment, by covering each output terminal 12 with a heating element 13, each output terminal 12 can be heated in a cold and humid environment, reducing the possibility of condensation and thus further improving the insulation performance and usability of the relay 1.

[0050] In specific applications, the number of output terminals 12 can be set to any number, such as 2, 3, 4, 5, 6, 7, or 8. Multiple output terminals 12 are spaced apart in the housing 11 to ensure electrical isolation between adjacent output terminals 12.

[0051] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments of this application, the relay 1 further includes an electrical connector 14, which is disposed in the housing 11. One end of the electrical connector 14 is electrically connected to a plurality of heating elements 13, and the other end of the electrical connector 14 is adapted to be electrically connected to a power source to supply power to the plurality of heating elements 13.

[0052] In this embodiment, multiple heating elements 13 can be powered simultaneously by the electrical connector 14, so that the heating elements 13 can heat the output terminal 12 when needed, and the electrical connector 14 is fixed by passing through the housing 11.

[0053] In specific applications, the electrical connector 14 can be a wire, copper busbar, or other connector that can electrically connect the power supply and the heating element 13. Those skilled in the art can make the configuration according to actual needs, and this application does not impose any restrictions on it.

[0054] Understandably, the electrical connector 14 includes a positive connector and a negative connector, exemplarily, such as... Figure 2 , Figure 3 and Figure 5 As shown, the positive terminal connector is connected in series with two heating elements 13, and the negative terminal connector is connected in series with two other heating elements 13, forming a current loop to supply power to each heating element 13, wherein an insulating connection is formed between the positive terminal connector and the negative terminal connector.

[0055] It should be explained that the other end of the electrical connector 14 is adapted to be electrically connected to a power source, which can be an external independent power source. When the relay 1 is used in the heating circuit of the battery pack, the power source specifically refers to the battery module of the battery pack.

[0056] like Figure 4 As shown, in some embodiments of this application, the relay 1 further includes a filling material layer 1112, which is disposed in the groove 1111, and the heating element 13 is at least partially embedded in the filling material layer 1112.

[0057] In this embodiment of the application, by providing a filling material layer 1112 in the groove 1111, the heating element 13 can be fixed, thereby improving the stability of the heating element 13.

[0058] In specific applications, the filling material layer 1112 can be the same material as the shell 11, such as rigid plastic; or it can be insulating adhesive, so as to fix the heating element 13 while insulating and isolating the heating element 13. Of course, other materials that can fix the heating element 13 and insulate and isolate the heating element 13 are also acceptable.

[0059] It should be explained that, in practical applications, when the filling material layer 1112 is disposed in the groove 1111, the heating element 13 is at least partially embedded in the filling material layer 1112, thereby fixing the heating element 13; of course, the filling material layer 1112 can also abut against the heating element 13, thereby fixing and limiting the heating element 13.

[0060] In some embodiments of this application, the relay 1 further includes a conductive adhesive layer disposed between the heating element 13 and the output terminal 12. The conductive adhesive layer is used for bonding and heat conduction between the heating element 13 and the output terminal 12.

[0061] In this embodiment, the heating element 13 and the output terminal 12 are bonded together by a conductive adhesive layer, which improves the connection stability between the heating element 13 and the output terminal 12 on the one hand, and improves the thermal conductivity between the heating element 13 and the output terminal 12 on the other hand.

[0062] In specific applications, the conductive adhesive layer can be an organic conductive adhesive, such as polyamide, polyurethane, polyester, etc.; or it can be at least one of inorganic conductive adhesives, carbon black conductive adhesives, silver paste conductive adhesives, carbon nanotube conductive adhesives, etc., as long as it can play a role in bonding and thermal conduction. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0063] It should be explained that the conductive adhesive layer can improve the thermal conductivity between the heating element 13 and the output terminal 12, so that more heat from the heating element 13 is conducted to the output terminal 12, rather than conducting too much heat to the filling material layer or the groove wall of the groove 1111, thereby improving safety and reliability.

[0064] In some embodiments of this application, the heating element 13 is an electric heating film.

[0065] In this embodiment, by setting the heating element 13 as an electric heating film, the space occupied by the heating element 13 is reduced while providing sufficient heat to the output terminal 12, thereby improving the utilization rate of the internal space of the relay 1.

[0066] In specific applications, the electric heating film can be at least one of metal heating film, carbon fiber heating film, graphene heating film, etc. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0067] In some embodiments of this application, the heating power P of the heating element 13 satisfies: 0.1 W / cm² 2 ≤P≤1W / cm 2 .

[0068] In this embodiment, by setting the heating power P of the heating element 13 within a reasonable range, the output terminal 12 can be heated while avoiding the risk of other components in contact with the heating element 13 being melted or deformed due to excessively high temperatures.

[0069] Understandably, when the heating power P of heating element 13 is less than 0.1 W / cm 2When the heating area of ​​the heating element 13 remains unchanged, the heating capacity may be insufficient, thus failing to heat all parts of the output terminal 12. Increasing the heating area of ​​the heating element 13 would cause it to occupy too much space and reduce the working area of ​​the output terminal 12. Furthermore, when the heating power P of the heating element 13 is greater than 1 W / cm², the heating capacity may be insufficient, preventing all parts of the output terminal 12 from being heated. 2 On the one hand, this will cause excessive heat from the heating element 13, resulting in waste; on the other hand, it may cause the heating temperature to be too high, which may cause the parts in contact with the heating element 13 to melt and deform.

[0070] In specific applications, the heating power P of the heating element 13 can be set to 0.1 W / cm². 2 0.2W / cm 2 0.3W / cm 2 0.4W / cm 2 0.5W / cm 2 0.6W / cm 2 0.7W / cm 2 0.8W / cm 2 0.9W / cm 2 1W / cm 2 Any value or any value between two values.

[0071] It should be explained that the specific heating power P of the heating element 13 is related to the size of the output terminal 12 and the thickness of the housing 11 of the relay 1. The size of the output terminal 12 limits the contact area between the heating element 13 and the output terminal 12, while the thickness of the housing 11 limits the groove depth of the recess 1111, which in turn also limits the contact area between the heating element 13 and the output terminal 12. For example, taking the heating element 13 as an electric heating film, when the contact area between the heating element 13 and the output terminal 12 is 5mm x 1.5mm = 7.5mm x 10mm... -2 cm 2 The heating power P of heating element 13 is 0.1W / ~1W / cm. 2 At that time, it can be calculated that the total heating power of the heating element 13 is in the range of 30mW to 300mW, which can meet the requirements of the output terminal 12 of the relay 1 within a certain temperature range, avoid the generation of condensate, and at the same time avoid the temperature of the receiving cavity 111 of the relay 1 from dropping suddenly, thereby generating condensate in the receiving cavity 111 and causing corrosion to the internal components of the relay 1.

[0072] In some embodiments of this application, a battery pack is also proposed, including a relay 1 as described in any of the above embodiments.

[0073] In this embodiment, the relay 1 includes a housing 11, an output terminal 12, and a heating element 13. The output terminal 12 passes through the housing 11, and the heating element 13 covers at least a portion of the output terminal 12, serving to heat the output terminal 12. By providing the heating element 13 on the output terminal 12 of the relay 1, condensation on the output terminal 12 in a humid and cold environment is prevented, improving the insulation performance of the relay 1 and reducing the corrosion of internal components by condensate, thereby enhancing the safety performance of the relay 1.

[0074] like Figure 5 As shown, in some embodiments of this application, the battery pack further includes a battery module, a control module 2, and a temperature sensor. The battery module is electrically connected to the heating element 13. The control module 2 is electrically connected to both the battery module and the heating element 13. The temperature sensor is electrically connected to the control module 2. The temperature sensor is used to sense the temperature inside the battery pack. The control module 2 is used to control the on / off connection between the battery module and the heating element 13 based on the temperature.

[0075] In this embodiment, the control module 2 can control the connection and disconnection between the battery module and the heating element 13 based on temperature. That is, it can control whether the heating element 13 works or not according to the temperature inside the battery pack, thereby turning on the heating element 13 when needed, improving the operational flexibility of the heating element 13 and reducing the energy waste of the battery module.

[0076] In specific applications, the control module 2 can be an independent circuit board, or it can be the battery management system (BMS) inside the battery pack. Of course, it can also be other single-chip microcomputers or microcontrollers that can receive and control signals. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0077] Understandably, the control module 2 senses the internal temperature of the battery pack through a temperature sensor. When the temperature is too low, for example, below 0°C, the control module 2 controls the heating element 13 to connect to the battery module and the heating element 13 works. When the temperature reaches a certain threshold, for example, 25°C, the control module 2 controls the heating element 13 to disconnect from the battery module and the heating element 13 stops working to prevent the temperature of the output terminal 12 from becoming too high.

[0078] Specifically, the temperature sensor can be a sensor originally used inside the battery pack to monitor the temperature of the battery module, or it can be a separate sensor set up to monitor the internal temperature of the battery pack, thereby determining whether the heating element 13 is turned on or off.

[0079] Of course, the temperature sensor can be at least one of thermocouple sensors, thermistors, semiconductor temperature sensors, infrared temperature sensors, etc. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0080] In practical applications, the temperature sensor can sense the internal temperature of the battery pack or directly sense the internal temperature of the housing cavity 111 of the relay 1. As long as the internal temperature is kept low, when condensation occurs at the output terminal 12, a signal can be fed back to the control module 2, and the control module 2 can activate the heating element 13.

[0081] In some embodiments of this application, the battery pack further includes a resistive heating film, the resistive heating film and relay 1 are electrically connected to the battery module, the resistive heating film is thermally connected to the battery module, the resistive heating film is used to heat the battery module, and the relay 1 is used to control the on / off connection between the resistive heating film and the battery module.

[0082] In this embodiment, the resistive heating film, relay 1, and battery module are electrically connected within the battery pack to form a heating circuit. The resistive heating film is thermally connected to the battery module. This heating circuit heats the battery module through the resistive heating film, thereby enabling the battery module to operate within a suitable range and improving the efficiency and lifespan of the battery pack.

[0083] Understandably, when the temperature is too low, the electrolyte inside the battery module becomes viscous, the activity of the active materials inside the battery module decreases, the electrochemical reaction slows down, and the internal resistance increases, thus causing a sharp decrease in the capacity of the battery module. Therefore, heating the battery module through a heating circuit improves the safety and performance of the battery pack.

[0084] In specific applications, the resistance heating film can be at least one of metal heating film, carbon fiber heating film, graphene heating film, etc. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0085] Understandably, the battery pack can be at least one of lithium battery packs, nickel-metal hydride battery packs, or lead-acid battery packs, and those skilled in the art can configure it according to actual needs. This application does not impose any restrictions on this.

[0086] It should be explained that a battery pack generally includes a battery box and multiple battery modules housed within the battery box. The battery box consists of an upper body and a lower body, with the upper body covering the lower body to form a closed space for accommodating the battery modules. Multiple battery modules can be arranged in any configuration within the battery box.

[0087] Preferably, in this application, the battery pack refers to a power battery pack.

[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0089] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A relay (1) characterized in that, The relay (1) comprises a shell (11), an output terminal (12) and a heating element (13), the shell (11) is provided with a receiving cavity (111), the output terminal (12) is arranged in the shell (11), and at least part of the output terminal (12) extends into the receiving cavity (111); a groove (1111) is arranged on the cavity wall of the receiving cavity (111), the groove (1111) at least partially surrounds the output terminal (12), and the heating element (13) is arranged in the groove (1111); and the heating element (13) is wrapped around at least part of the circumference of the output terminal (12) and is used for heating the output terminal (12). A plurality of output terminals (12) are arranged in the shell (11) at intervals, and the heating element (13) is wrapped around each output terminal (12).

2. The relay (1) according to claim 1, characterized in that The relay (1) further comprises an electrical connecting element (14) arranged in the shell (11), one end of the electrical connecting element (14) is electrically connected to the plurality of heating elements (13), and the other end of the electrical connecting element (14) is adapted to be electrically connected to a power source to supply power to the plurality of heating elements (13).

3. The relay (1) according to claim 2, characterized in that A filling material layer (1112) is further arranged in the groove (1111), and the heating element (13) is at least partially embedded in the filling material layer (1112).

4. The relay (1) according to any one of claims 1 to 3, characterized in that A thermally conductive adhesive layer is further arranged between the heating element (13) and the output terminal (12), and is used for bonding and heat conduction between the heating element (13) and the output terminal (12).

5. A relay (1) according to any one of claims 1-3, characterized in that The heating element (13) is an electric heating film.

6. A relay (1) according to any one of claims 1-3, characterized in that The relay (1) according to any one of claims 1-7.

7. The relay (1) according to claim 6, characterized in that The heating power P of the heating element (13) satisfies: 0.1 W / cm 2 ≤ P ≤ 1 W / cm 2 .

8. A battery pack, characterized by, The battery pack further comprises a battery module, a control module (2) and a temperature sensor, the battery module is electrically connected to the heating element (13), the control module (2) is electrically connected to the battery module and the heating element (13) respectively, the temperature sensor is electrically connected to the control module (2), the temperature sensor is used for sensing the temperature in the battery pack, and the control module (2) is used for controlling the on-off between the battery module and the heating element (13) based on the temperature.

9. The battery pack of claim 8, wherein, The battery pack further comprises an electric resistance heating film, the electric resistance heating film, the relay (1) and the battery module are electrically connected, the electric resistance heating film is in heat conduction connection with the battery module, the electric resistance heating film is used for heating the battery module, and the relay (1) is used for controlling the on-off between the electric resistance heating film and the battery module.

10. The battery pack of claim 9, wherein, ​

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