Battery disconnect unit

Abstract

A battery disconnect unit according to the present application includes a BDU housing, an electronic relay module having an electronic switching device and disposed on a charge and discharge line of a battery within the BDU housing, the electronic switching device capable of selective switching operations that block current flow in the charge and discharge line, a heat sink provided with a structure that encloses at least a portion of the electronic relay module and formed of a material capable of heat exchange with the electronic relay module, and a cooling plate disposed in contact with the heat sink and configured to enable a flow of a refrigerant in the cooling plate.

Description

Technical Field

[0001] This disclosure relates to a battery disconnection unit, and more particularly, to a battery disconnection unit designed to use an electronic relay module without the risk of contact soldering, and to properly manage the temperature of the electronic relay module.

[0002] This application claims priority to Korean Patent Application No. 10-2020-0136057, filed in Korea on October 20, 2020, the disclosure of which is incorporated herein by reference. Background Technology

[0003] Large-capacity battery packs are installed in electric vehicles (EVs), hybrid electric vehicles (HVs), and the like to power their operation.

[0004] The battery pack is connected to a load or charger via a battery disconnect unit. A load is a device that receives power from the battery pack, such as a motor or inverter.

[0005] like Figure 1 As shown, the battery disconnection unit includes: a high-potential relay 10, which is installed on the line connecting the positive terminal of the battery pack B to the positive terminal of the load L; and a low-potential relay 20, which is installed on the line connecting the negative terminal of the battery pack B to the negative terminal of the load L.

[0006] When battery pack B is electrically connected to load L, a large voltage from battery pack B is suddenly applied to load L, causing a surge current to flow first to load L. This surge current can cause irreversible damage by applying an electric shock to load L.

[0007] Therefore, the battery disconnection unit includes: an RC circuit including a pre-charge resistor 40 and a capacitor 50; and a pre-charge relay 30 connected in parallel with a high-potential relay 10.

[0008] When battery pack B and load L are intended to be electrically connected to each other, low-potential relay 20 and pre-charge relay 30 are first turned on. Then, the current output from battery pack B flows through the RC circuit to capacitor 50, and the magnitude of the current flowing through capacitor 50 gradually decreases over time.

[0009] When the pre-charge relay 30 is turned on and the current reaches a level that does not affect the pre-charge target voltage of the load L, the high-potential relay 10 is turned on next, and then the pre-charge relay 30 is turned off, thereby completing the electrical connection between the battery pack B and the load L.

[0010] Electromechanical relays that control the interruption of metal contacts by using the excitation force of a magnetic coil and the restoring force of a spring have been widely used as high-potential relays, low-potential relays, and pre-charge relays.

[0011] However, electromechanical relays are prone to failure due to spring malfunction and contact corrosion, and contact damage or welding may occur whenever a large current is switched on or off. Furthermore, electromechanical relays consume a lot of power, generate a lot of heat, have a high failure rate, are bulky, heavy due to most of their components being made of metal, and are relatively expensive.

[0012] Due to these drawbacks of electromechanical relays, electronic relays, which use electronic devices such as insulated-gate bipolar transistors (IGBTs) or field-effect transistors (FETs) to power on or off, have been used as an alternative to electromechanical relays in recent years. However, even in the case of electronic relays, the electronic devices can be damaged if the heat generated by the high current supply is not properly managed, thus requiring a cooling device for electronic relays. Constructing an effective cooling device is not easy. Summary of the Invention

[0013] Technical issues

[0014] This disclosure is designed to address the problems of the prior art; therefore, this disclosure aims to provide a battery disconnection unit including a cooling device for effectively cooling an electronic relay, as a battery disconnection unit using an electronic relay.

[0015] The technical problems to be solved by this disclosure are not limited to those described above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description of this disclosure.

[0016] Technical solutions

[0017] In one aspect of this disclosure, a battery disconnection unit is provided, comprising: a BDU housing; an electronic relay module mounted on a battery charging / discharging circuit within the BDU housing, the electronic relay module including an electronic switching device capable of selectively blocking current flow in the charging / discharging circuit; a heat sink having a structure surrounding at least a portion of the electronic relay module and formed of a material capable of heat exchange with the electronic relay module; and a cooling plate configured to contact the heat sink and to allow refrigerant to flow within the cooling plate.

[0018] The electronic relay module may include: a first electronic relay mounted on a line connecting the positive terminal of the battery to the positive terminal of an external device; a second electronic relay mounted on a line connecting the negative terminal of the battery to the negative terminal of an external device; and a gate driver connected to the first and second electronic relays and configured to control the switching operation of the electronic switching device.

[0019] The gate driver can be implemented as a printed circuit board, and the board surface of the gate driver can be configured to be perpendicular to the first electronic relay or the second electronic relay.

[0020] The heat sink may include an upper shroud and a lower shroud, which are configured to be connected to each other. The lower shroud may be configured as a block, comprising: three first protrusions respectively located on two edges and a central region of the lower shroud; and two first receiving grooves concavely formed on both sides of the first protrusions located on the central region. The upper shroud may be configured as a block, comprising three second protrusions and two second receiving grooves, the three second protrusions and the two second receiving grooves corresponding vertically to the three first protrusions and two first receiving grooves of the lower shroud. A first electronic relay and a second electronic relay may be respectively constrained in the spaces formed by the two first receiving grooves and the two second receiving grooves.

[0021] The first heat transfer pad can be disposed on the surface of the first receiving groove and the surface of the second receiving groove.

[0022] Thermal interface material (TIM) can be placed between the lower surface of the lower cover and the cooling plate.

[0023] The cover may have an upper surface with a raised and recessed pattern structure.

[0024] Each electronic switching device can be an insulated gate bipolar transistor (IGBT) or a metal-oxide-semiconductor field-effect transistor (MOSFET).

[0025] The BDU housing may include a lower housing and a top cover, which are configured to be connected to each other. A heat sink may be fixedly disposed above the lower housing, and a cooling plate may be fixedly disposed below the lower housing, with a portion of the lower housing below the heat sink open to allow the heat sink and the cooling plate to contact each other.

[0026] The battery disconnect unit may further include: a refrigerant supply pipe connected to one side of the cooling plate; and a refrigerant discharge pipe connected to the other side of the cooling plate.

[0027] In another aspect of this disclosure, a battery pack including the aforementioned battery disconnection unit is provided.

[0028] In another aspect of this disclosure, an electric vehicle including the aforementioned battery pack is provided.

[0029] Beneficial effects

[0030] According to aspects of this disclosure, a battery disconnect unit comprising a cooling device for effectively cooling an electronic relay can be provided as a battery disconnect unit using an electronic relay.

[0031] The battery disconnect unit according to this disclosure eliminates concerns about contact welding and can be made smaller and lighter than conventional battery disconnect units because it uses an electronic relay with an electronic switching device instead of a large electromechanical relay.

[0032] The effects of this disclosure are not limited to those described above, and those skilled in the art to which this disclosure pertains will clearly understand any effects not mentioned through this specification and the accompanying drawings. Attached Figure Description

[0033] Figure 1 This is a circuit diagram of a traditional relay circuit unit located between the battery pack and the load.

[0034] Figure 2 This is a perspective view of a battery disconnection unit according to an embodiment of the present disclosure.

[0035] Figure 3 The top cover has been omitted. Figure 2 A plan view of the battery disconnect unit.

[0036] Figure 4 This is an exploded perspective view of an electronic relay module according to an embodiment of the present disclosure.

[0037] Figure 5 yes Figure 4 A combined perspective view of the electronic relay module.

[0038] Figure 6 yes Figure 4 A perspective view of the cooling structure of the electronic relay module.

[0039] Figure 7 This is a conceptual diagram of the cooling structure of an electronic relay module according to an embodiment of the present disclosure. Detailed Implementation

[0040] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Before description, it should be understood that the terminology used in the specification and appended claims should not be construed as limited to its general and dictionary meaning, but rather should be interpreted based on the meaning and concepts corresponding to the technical aspects of the present disclosure, on the basis of allowing the inventors to appropriately define the terms for best interpretation. Therefore, the descriptions presented herein are merely preferred examples for illustrative purposes only and are not intended to limit the scope of the present disclosure; thus, it should be understood that other equivalents and modifications may be made thereto without departing from the scope of the present disclosure.

[0041] Because the embodiments of this disclosure are provided to explain the disclosure more fully to those skilled in the art, the shapes and dimensions of the components in the drawings may be exaggerated, omitted, or shown schematically for clarity. Therefore, the dimensions or proportions of each component do not perfectly reflect its actual size or proportions.

[0042] Figure 2 This is a perspective view of a battery disconnection unit according to an embodiment of the present disclosure. Figure 3 The top cover has been omitted. Figure 2 A plan view of the battery disconnect unit. Figure 4 This is an exploded perspective view of an electronic relay module according to an embodiment of the present disclosure, and Figure 5 yes Figure 4 A combined perspective view of the electronic relay module.

[0043] Referring to these figures, the battery disconnection unit according to an embodiment of the present disclosure includes a BDU housing 100, an electronic relay module 200, a heat sink 300, a cooling plate 400, a refrigerant supply pipe 500, and a refrigerant discharge pipe 600.

[0044] The BDU housing 100 includes a lower housing 110 and a top cover 120, which are configured to be assembled with each other. The BDU housing 100 can be manufactured by, for example, injection molding of a plastic resin.

[0045] The lower housing 110 has a box shape with an open top and is configured to allow the installation of an electronic relay module 200, a current sensor, a pre-charge resistor 240, multiple busbars 114, cables, etc. For example, as shown, various electrical components can be securely mounted to the lower housing 110 using bolts / nuts, etc.

[0046] The top cover 120 has an open lower surface and can be combined and mounted on the lower housing 110.

[0047] For example, the lower housing 110 may include a support rod 111 that protrudes upward in the form of a column at four corner areas, and the top cover 120 may include four mounting portions 121 that are formed flat to contact the upper end surface of the support rod 111 face-to-face. Holes are further formed in the four mounting portions 121, and the top cover 120 can be securely connected to the lower housing 110 when hexagonal bolts B are inserted into these holes and tightened to the support rod 111.

[0048] After the lower housing 110 is connected to the top cover 120, the BDU housing 100 can be configured to have a sealed shape, except for an opening for the entry of the cable or busbar 114 and for connecting to the underside of the cooling plate 400 for cooling the electronic relay module 200. The opening for the entry of the cable or busbar 114 is used to form a charging / discharging line or connection for a connector on the side of the BDU housing 100, which will be described later.

[0049] According to the present embodiment, the battery disconnect unit is a component of the battery pack and can be installed inside the battery pack housing (not shown) that constitutes the battery pack. The battery disconnect unit may include four supports 112 located below the lower ends of the four corners of the lower housing 110, such that these four supports 112 can be used when the battery disconnect unit is installed inside the battery pack housing.

[0050] The electronic relay module 200 can be installed on the battery charging / discharging circuit inside the BDU housing 100. The battery refers to the individual secondary battery cells included in the battery pack; the battery discharging circuit refers to the wiring that connects the battery to a device receiving power from the battery (such as a motor or inverter in an electric vehicle); and the battery charging circuit refers to the wiring that connects a charger external to the battery pack to the battery.

[0051] The electronic relay module 200 includes an electronic switching device and selectively blocks the flow of current in the battery's charging / discharging circuit, thereby stably supplying power from the high-voltage battery to, for example, a motor, or interrupting the power supply.

[0052] Traditional electromechanical relay modules include, for example, a main relay, a pre-charge relay, and a pre-charge resistor. The main relay supplies or blocks power between the high-voltage battery and the motor, while the pre-charge relay and pre-charge resistor prevent damage to the device due to initial current. In the electronic relay module 200 according to this disclosure, an electronic switching device functions as both the main relay and the pre-charge relay of the electromechanical relay.

[0053] An electronic switching device is a semiconductor switching device used for on or off control, and may include one or more metal-oxide-semiconductor field-effect transistors (MOSFETs) or one or more insulated-gate bipolar transistors (IGBTs).

[0054] For details, please refer to Figure 4 The electronic relay module 200 according to this embodiment includes a first electronic relay 210, a second electronic relay 220 and a gate driver 230.

[0055] The first electronic relay 210 includes: a first IGBT circuit unit; a first device housing 211 for protecting the first IGBT circuit unit; and first terminals 212 and 213 extending from the first IGBT circuit unit to the outside of the first device housing 211. The second electronic relay 220 includes: a second IGBT circuit unit configured to have a circuit such that current is induced in the opposite direction to that of the first IGBT circuit unit; a second device housing 221 surrounding the second IGBT circuit unit; and second terminals 222 and 223 extending from the second IGBT circuit unit to the outside of the second device housing 221. The first electronic relay 210 and the second electronic relay 220 may be configured to be substantially identical in appearance to each other.

[0056] The first electronic relay 210 is connected via bus bar 114 to the positive terminal B(+) of the battery and the positive terminal HV+ of the external device to selectively block current flow in the high-potential line. The second electronic relay 220 is connected via another bus bar 114 to the negative terminal B(-) of the battery and the negative terminal HV- of the external device to selectively block current flow in the low-potential line.

[0057] In the first electronic relay 210, the first terminal 212 of the two first terminal portions 212 and 213 can be connected to the positive terminal B+ of the battery via a busbar 114, and the first terminal 213 of the two first terminal portions 212 and 213 can be electrically connected to the positive terminal HV+ of an external device via another busbar 114. In the second electronic relay 220, the second terminal 223 of the two second terminal portions 222 and 223 can be connected to the negative terminal B- of the battery via another busbar 114, and the second terminal 222 of the two second terminal portions 222 and 223 can be electrically connected to the negative terminal HV- of an external device via another busbar 114.

[0058] The gate driver 230 is connected to the first electronic relay 210 and the second electronic relay 220 to control the switching operation of the electronic switching device.

[0059] The gate driver 230 is capable of communicating with the battery management system (BMS) and can be configured to turn electronic switching devices on or off based on signals received from the BMS.

[0060] The gate driver 230 can be connected to the first electronic relay 210 and the second electronic relay 220 via the metal pin P.

[0061] In particular, the gate driver 230 according to this embodiment can be implemented as a printed circuit board (PCB), and the board surface of the gate driver 230 can be arranged perpendicular to the first electronic relay 210 or the second electronic relay 220.

[0062] For example, such as Figure 4 As shown, the gate driver 230 can be uprightly arranged to the left of the first electronic relay 210 and the second electronic relay 220, and can be integrally formed with the first electronic relay 210 and the second electronic relay 220 via metal pins P formed of rigid material. The gate driver 230 can be stably and vertically arranged on the lower housing 110 via a support 260, which is configured such that one end of the support 260 is bolted to the lower housing 110 and the other end of the support 260 is bolted to the gate driver 230.

[0063] The gate driver 230 may include a busbar channel portion O, which is configured to have a partially recessed lower end. The busbar 114 forming the charging / discharging line may pass through the busbar channel portion O and may be connected to the first terminal portion 213 of the first electronic relay 210 or the second terminal portion 223 of the second electronic relay 220 without bypassing the gate driver 230.

[0064] According to the above structure, the area of ​​the lower housing 110 can be utilized more extensively. In other words, when the PCB-shaped gate driver 230 is arranged perpendicular to the bottom surface of the lower housing 110, space for mounting other components can be ensured, and wiring can be made easier. For example, as Figure 3 As shown, since the gate driver 230 is placed upright, it is easy to arrange components such as the precharge resistor 240 and the fuse 250 next to each other and simply connect them with cables.

[0065] The heat sink 300 is a component used to cool and protect the electronic relay module 200, and may be formed of a material capable of heat exchange with the electronic relay module 200, and may be configured to have a structure that surrounds the first electronic relay 210 and the second electronic relay 220.

[0066] Come back for reference Figure 4 and Figure 5 According to this embodiment, the heat sink 300 may include a lower cover 310 and an upper cover 320 that are connected to each other, and the lower cover 310 and the upper cover 320 may be formed of a material with excellent thermal conductivity, such as aluminum or graphite.

[0067] The lower cover 310 can be configured as a block shape, the lower cover 310 including: three first protrusions 311, 312 and 313, the three first protrusions 311, 312 and 313 being located at two edges and the center of the lower cover 310 respectively; and two first receiving grooves 314 and 315, the two first receiving grooves 314 and 315 being concavely formed on both sides of the first protrusion 312 at the center of the lower cover 310.

[0068] The upper cover 320 can be configured as a block shape, and the upper cover 320 includes three second protrusions 321, 322 and 323 and two second receiving grooves 324 and 325. The three second protrusions 321, 322 and 323 and the two second receiving grooves 324 and 325 correspond in the vertical direction to the three first protrusions 311, 312 and 313 and the two first receiving grooves 314 and 315 of the lower cover 310, respectively.

[0069] The first electronic relay 210 and the second electronic relay 220 can be mounted on the two first receiving grooves 314 and 315 of the lower cover 310. At this time, the heat transfer pad 330 can be placed on the corresponding surface of the first receiving groove to eliminate the thermal contact resistance caused by the surface roughness difference between the lower cover 310, the first electronic relay 210 and the second electronic relay 220, thereby increasing the thermal conductivity.

[0070] The upper portion of the first electronic relay 210 and the upper portion of the second electronic relay 220 can be covered by the upper cover 320. At this time, additional heat transfer pads 330 can be arranged on the upper portions of the first electronic relay 210 and the second electronic relay 220, and the upper portion of these additional heat transfer pads 330 can be covered by the upper cover 320. The three first protrusions 311, 312, and 313 of the lower cover 310 can be fastened to the three second protrusions 321, 322, and 323 of the upper cover 320 using bolts B. A plate-shaped gasket W can be added between the first protrusions 311, 312, and 313 and the second protrusions 321, 322, and 323 to disperse impact forces during bolt tightening.

[0071] According to this structure, the first electronic relay 210 and the second electronic relay 220 can be respectively confined within the space formed by two first receiving grooves 314 and 315 and two second receiving grooves 324 and 325. Since the heat sink 300 has a structure that surrounds the first electronic relay 210 and the second electronic relay 220, the heat sink 300 can quickly absorb heat when it is generated in the first electronic relay 210 and the second electronic relay 220.

[0072] The heat dissipation structure of the heat sink will now be described. According to this embodiment, the heat sink 300 can be cooled by convection and conduction. In other words, referring to... Figure 6 and Figure 7 According to this embodiment, the heat sink 300 can be configured to achieve convection heat dissipation through its upper part and its front, rear, left and right sides, and to achieve conduction heat dissipation by contacting the cooling plate 400 with its lower part.

[0073] To maximize the effect of convective heat dissipation, the upper surface of the upper cover 320 of the heat sink 300 may have a structure with an embossed pattern 327. In other words, convective heat dissipation is promoted by further increasing the contact area between the upper cover 320 and the atmosphere.

[0074] To conduct heat dissipation, a cooling plate 400, which serves as a cryogenic body with a temperature lower than that of the heat sink 300, comes into contact with the lower surface of the lower cover 310 of the heat sink 300. In this case, a thermal interface material (TIM) can be placed between the lower cover 310 and the cooling plate 400. A material with good thermal conductivity can be used as the TIM 340, such as thermal paste, ceramic-mixed silicone resin, or carbon nanotubes. It may be advantageous for the TIM 340 to be in the form of an adhesive pad rather than a liquid when the lower cover 310 is adhesively fixed to the cooling plate 400.

[0075] The cooling plate 400 may include a flow path formed as a hollow structure (through which refrigerant can flow) and may be configured as a plate-like body. The heat sink 400 is arranged below the heat sink 300 to cool the heat sink 300.

[0076] The refrigerant supply pipe 500 and the refrigerant discharge pipe 600 can be connected to one side or the other side of the cooling plate 400, respectively. The refrigerant supply pipe 500 and the refrigerant discharge pipe 600 can be connected to a refrigerant supply main pipe (not shown) and a refrigerant discharge main pipe (not shown) used for cooling secondary battery cells in a conventional battery pack.

[0077] The refrigerant supply pipe 500 and the refrigerant discharge pipe 600 can communicate with the flow path within the cooling plate 400. The refrigerant can be cooling water, which is introduced into the cooling plate 400 via the refrigerant supply pipe 500 to absorb the heat dissipated through the heat sink 300, and is discharged from the cooling plate 400 via the refrigerant discharge pipe 600.

[0078] The flow rate of refrigerant introduced into the cooling plate 400 via the refrigerant supply pipe 500 can be controlled by the BMS. For example, a temperature sensor capable of measuring the temperature of the electronic relay module 200 can be included in the lower housing 110, and the data measured by the temperature sensor can be transmitted to the BMS. The BMS can adjust the flow rate of refrigerant supplied to the cooling plate 400 according to the temperature of the electronic relay module 200.

[0079] According to this embodiment, the heat sink 300 is fixedly arranged on the upper part of the lower housing 110, and the cooling plate 400 is fixedly arranged on the lower part of the lower housing 110. The bottom of the lower housing 110 below the heat sink 300 is open.

[0080] Additionally, in the battery disconnection unit according to this embodiment (see...) Figure 2 and Figure 3 The heat sink 300 surrounding the first electronic relay 210 and the second electronic relay 220 is fixedly arranged on the upper part of the lower housing 110 using bolts, and a bracket BK for mounting components is provided on the upper part of the heat sink 300. The bracket BK for mounting components supports the pre-charge resistor 240 and covers the upper surface of the heat sink 300, but a predetermined separation space is formed between the bracket BK and the heat sink 300, thereby allowing the heat sink 300 to dissipate heat through convection. The bottom of the lower housing 110 below the heat sink 300 can be partially open. Through this open structure, the lower surface of the heat sink 300 can contact the upper surface of the cooling plate 400.

[0081] The battery disconnect unit according to this disclosure eliminates concerns about contact welding and can be manufactured to be smaller and lighter than conventional battery disconnect units. This is because the battery disconnect unit includes an electronic relay module 200 using electronic switching devices instead of a large electromechanical relay. Furthermore, the electronic switching devices of the electronic relay module 200 can be managed to maintain optimal temperatures, thereby improving the operational reliability and lifespan characteristics of the electronic switching devices.

[0082] In addition to the battery disconnection unit described above, the battery pack according to this disclosure may further include: one or more battery modules; various devices (not shown) for controlling the charging / discharging of the battery modules, such as a BMS, a current sensor, and a fuse; and a battery pack housing for housing them.

[0083] The battery pack according to this disclosure can be applied to vehicles such as electric vehicles or hybrid electric vehicles. In other words, a vehicle according to this disclosure can be configured to have the battery disconnection unit described above according to embodiments of this disclosure and a battery pack including the battery disconnection unit.

[0084] This disclosure has been described in detail. However, it should be understood that while the detailed description and specific examples indicate preferred embodiments of this disclosure, they are given by way of illustration only, as various changes and modifications within the scope of this disclosure will become apparent to those skilled in the art from this detailed description.

[0085] At the same time, although terms such as up, down, left and right are used in this specification to indicate direction, these terms are for descriptive convenience only, and it will be apparent to those skilled in the art that these terms may vary depending on the position of the object or the position of the observer.

Claims

1. A battery disconnection unit, comprising: BDU casing; An electronic relay module is installed on the charging / discharging circuit of the battery within the BDU housing, and the electronic relay module includes an electronic switching device capable of selectively blocking the current flow in the charging / discharging circuit. A heat sink, the heat sink having a structure that surrounds at least a portion of the electronic relay module, and being formed of a material capable of heat exchange with the electronic relay module; as well as A cooling plate, configured to contact the heat sink and to allow refrigerant to flow within the cooling plate. The BDU housing includes a lower housing and a top cover, which are connected to each other. The heat sink is fixedly mounted above the lower outer casing. The cooling plate is fixedly disposed below the lower housing, and The lower housing has a portion that is open below the heat sink, allowing the heat sink and the cooling plate to come into contact with each other.

2. The battery disconnection unit according to claim 1, wherein, The electronic relay module includes: A first electronic relay is installed on a line that connects the positive terminal of the battery to the positive terminal of an external device; A second electronic relay is installed on the line that connects the negative terminal of the battery to the negative terminal of the external device; and A gate driver is connected to the first electronic relay and the second electronic relay and is configured to control the switching operation of the electronic switching device.

3. The battery disconnection unit according to claim 2, wherein, The gate driver is implemented as a printed circuit board, and the board surface of the gate driver is configured to be perpendicular to the first electronic relay or the second electronic relay.

4. The battery disconnection unit according to claim 2, wherein, The heat sink includes an upper cover and a lower cover, which are connected to each other. The lower cover is configured as a block, comprising: three first protrusions respectively on two edges and a central region of the lower cover; and two first receiving grooves concavely formed on both sides of the first protrusion located in the central region. The upper cover is configured as a block, comprising three second protrusions and two second receiving grooves, the three second protrusions and the two second receiving grooves corresponding vertically to the three first protrusions and the two first receiving grooves of the lower cover. The first electronic relay and the second electronic relay are respectively constrained in the space formed by the two first receiving grooves and the two second receiving grooves.

5. The battery disconnection unit according to claim 4, wherein, The first heat transfer pad is disposed on the surface of the first receiving groove and the surface of the second receiving groove.

6. The battery disconnection unit according to claim 4, wherein, A thermal interface material is disposed between the lower surface of the lower cover and the cooling plate.

7. The battery disconnection unit according to claim 4, wherein, The upper cover has an upper surface with a raised and recessed pattern structure.

8. The battery disconnection unit according to claim 1, wherein, Each of the electronic switching devices is an insulated gate bipolar transistor (IGBT) or a metal-oxide-semiconductor field-effect transistor (MOSFET).

9. The battery disconnection unit according to claim 1, further comprising: A refrigerant supply pipe is connected to one side of the cooling plate; And a refrigerant discharge pipe, which is connected to the other side of the cooling plate.

10. A battery pack comprising a battery disconnect unit according to any one of claims 1 to 9.

11. An electric vehicle comprising a battery pack according to claim 10.

Images