Battery pack circuit breaking unit and battery pack

Abstract

The utility model provides a battery pack circuit breaking unit and a battery pack, and relates to the technical field of batteries. The battery pack circuit breaking unit comprises an upper shell, an electric appliance assembly, a lower shell, a liquid cooling assembly, at least two copper bars and at least two flexible heat conduction pieces, the upper shell is connected with the lower shell, a containing cavity is defined by the upper shell and the lower shell together, and the electric appliance assembly is located in the containing cavity; the copper bars are embedded in the lower shell, one faces of the copper bars are electrically connected with the electric appliance assembly, the faces, away from the electric appliance assembly, of the copper bars are connected with the flexible heat conduction pieces in a one-to-one correspondence mode, and the faces, away from the copper bars, of the flexible heat conduction pieces are connected with the liquid cooling assembly. According to the battery pack circuit breaking unit and the battery pack, the flexible heat conduction piece is in full contact with the outer surface of the copper bar, the heat dissipation area of the copper bar is effectively increased, and the heat dissipation efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack disconnect unit and a battery pack. Background Art

[0002] The Battery Disconnect Unit (BDU) is a core component of new energy vehicles, ensuring the smooth charging and discharging of the battery system. When the power battery system is charging and discharging at high power, the various electrical components within the BDU generate significant heat, necessitating a heat dissipation device to ensure the BDU's safe and normal operation.

[0003] In the prior art, a liquid cooling plate is provided on the lower shell of the BDU. Multiple copper bars in the BDU pass through the lower shell and are in direct contact with the liquid cooling plate. When the temperature sensor in the BDU detects that the temperature is too high, the liquid cooling plate is turned on to dissipate heat.

[0004] However, since the surface of the copper busbar is not smooth and the thickness of different copper busbars in the BDU is different, the bottom surfaces of the copper busbars are not on the same horizontal plane. Therefore, the direct contact area between the copper busbar and the liquid cold plate is limited, and the heat dissipation effect is poor. Utility Model Content

[0005] The present application provides a battery pack circuit breaker unit and a battery pack, which are used to solve the problem that the direct contact area between the copper busbar of the existing battery pack circuit breaker unit and the liquid cooling plate is small and the heat dissipation effect is poor.

[0006] In one aspect, the present application provides a battery pack disconnect unit, comprising an upper housing, an electrical component, a lower housing, a liquid cooling component, at least two copper bars, and at least two flexible heat conducting members;

[0007] The upper shell is connected to the lower shell, and the upper shell and the lower shell together form a receiving cavity, and the electrical component is located in the receiving cavity;

[0008] The copper busbar is embedded in the lower housing, one side of the copper busbar is electrically connected to the electrical component, and the side of the copper busbar facing away from the electrical component is connected to the flexible heat-conducting parts one by one, and the side of each flexible heat-conducting part facing away from the copper busbar is connected to the liquid cooling component;

[0009] The liquid cooling assembly is connected to a side of the lower shell facing away from the upper shell.

[0010] In one possible implementation, the battery pack disconnect unit provided in the present application further includes a seal;

[0011] The liquid cooling assembly is connected to the lower shell, the sealing member is arranged between the liquid cooling assembly and the lower shell, the sealing member, the liquid cooling assembly and the lower shell together form a sealed cavity, and the flexible heat conductive member is located in the sealed cavity.

[0012] In one possible implementation, the battery pack disconnect unit provided in the present application has a plurality of mounting slots formed on a side of the lower shell facing away from the upper shell;

[0013] The mounting groove is correspondingly arranged around the circumference of the copper busbar, the flexible heat-conducting member is connected to the mounting groove, and the projection of the copper busbar toward the flexible heat-conducting member is located inside the flexible heat-conducting member.

[0014] In one possible implementation, the battery pack disconnect unit provided by the present application comprises a flexible heat-conducting member including a connecting portion and a heat-conducting portion;

[0015] The connecting portion is arranged around the peripheral side of the heat conducting portion, and the connecting portion is clamped with the mounting groove so that the heat conducting portion is pressed tightly on the copper busbar.

[0016] In one possible implementation, the battery pack disconnect unit provided by the present application has an electrical component including at least one temperature sensor;

[0017] The temperature sensor is set on the copper busbar, and the temperature sensor is used to detect the temperature of the copper busbar;

[0018] When the temperature is greater than or equal to the preset value, the liquid cooling component is turned on.

[0019] In one possible implementation, the battery pack disconnect unit provided in the present application has a liquid cooling assembly including a first liquid cooling plate and a second liquid cooling plate;

[0020] The first liquid cooling plate is connected to the sealing member, and a liquid outlet and a liquid inlet are provided on one of the first liquid cooling plate and the second liquid cooling plate, the first liquid cooling plate and the second liquid cooling plate form a liquid cooling cavity, and the liquid outlet and the liquid inlet are both in communication with the liquid cooling cavity;

[0021] The liquid outlet and the liquid inlet are both used to communicate with a supply device for the cooling medium, so that the cooling medium enters the liquid cooling cavity through the liquid inlet and flows out of the liquid cooling cavity through the liquid outlet.

[0022] In one possible implementation, the battery pack circuit breaker unit provided in the present application has a flow slot provided on the second liquid cooling plate;

[0023] The circulation groove and the first liquid cooling plate together form a liquid cooling cavity.

[0024] In one possible implementation, the battery pack circuit breaker unit provided in the present application has an epoxy resin protective layer on the outer surface of the copper busbar.

[0025] In one possible implementation, the battery pack disconnect unit provided in the present application has a plurality of buckles spaced apart on a circumference of one of the upper shell and the lower shell, and a plurality of hooks spaced apart on a circumference of the other of the upper shell and the lower shell;

[0026] The buckles and the hooks are connected in a one-to-one correspondence.

[0027] On the other hand, the present application provides a battery pack, comprising a battery pack body and any one of the above-mentioned battery pack disconnecting units arranged on the battery pack body.

[0028] The battery pack circuit breaker unit and battery pack provided by the present application, the battery pack circuit breaker unit is provided by setting an upper shell and a lower shell, and connecting the upper shell and the lower shell to form a receiving cavity together, the electrical component is arranged in the receiving cavity, the copper bar is embedded in the lower shell, the two opposite sides of the copper bar are respectively connected to the electrical component and the flexible heat conductor, the heat generated by the electrical component is transferred out through the copper bar, the two opposite sides of the flexible heat conductor are respectively connected to the copper bar and the liquid cooling component, and the liquid cooling component is connected to the lower shell to press the flexible heat conductor between the copper bar and the liquid cooling component. Due to the low hardness of the flexible heat conductor, after the flexible heat conductor is pressed, it can be fully contacted with the outer surface of the copper bar, that is, the liquid cooling component, effectively increasing the heat dissipation area of the copper bar, thereby improving the heat dissipation efficiency. At the same time, since the thickness and size of each copper bar may be different, the flexible heat conductor is set to at least two, and the flexible heat conductor corresponds to the copper bar one-to-one. Different flexible heat conductors can be selected according to the different shapes of the copper bar, thereby ensuring that each copper bar can be fully contacted with the flexible heat conductor, ensuring that each copper bar is effectively dissipated. Therefore, the battery pack circuit breaker unit provided in the present application effectively increases the heat dissipation area of the copper busbar and improves the heat dissipation effect by arranging a flexible heat-conducting member between the lower surface of each copper busbar and the liquid cooling assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 A schematic structural diagram of a battery pack disconnect unit provided in an embodiment of the present application;

[0031] Figure 2 for Figure 1 Exploded diagram;

[0032] Figure 3 A schematic structural diagram of the lower housing and electrical components of the battery pack disconnect unit provided in an embodiment of the present application;

[0033] Figure 4 A schematic structural diagram of the lower housing and the flexible heat-conducting member of the battery pack disconnect unit provided in an embodiment of the present application;

[0034] Figure 5 A schematic structural diagram of a liquid cooling assembly of a battery pack disconnect unit provided in an embodiment of the present application;

[0035] Figure 6 for Figure 4 A schematic diagram of the structure of the second liquid cooling plate of the middle liquid cooling assembly;

[0036] Figure 7 A schematic structural diagram of a flexible heat-conducting member of a battery pack disconnect unit provided in an embodiment of the present application;

[0037] Figure 8 for Figure 1 Structural diagram from another perspective;

[0038] Figure 9 for Figure 8 AA cross-section view.

[0039] Description of reference numerals:

[0040] 100-upper housing;

[0041] 110- buckle;

[0042] 120-accommodation cavity;

[0043] 200-Electrical components;

[0044] 210-temperature sensor;

[0045] 220-shunt;

[0046] 230-main negative relay;

[0047] 240-fast charge negative relay;

[0048] 250-fast charge positive relay;

[0049] 260-main positive relay;

[0050] 270-excitation fuse;

[0051] 300-lower housing;

[0052] 310-mounting slot;

[0053] 320-hook;

[0054] 400-liquid cooling assembly;

[0055] 410-first liquid cooling plate;

[0056] 420-second liquid cooling plate;

[0057] 421- circulation slot;

[0058] 430-liquid inlet;

[0059] 440-liquid outlet;

[0060] 500-copper busbar;

[0061] 600-flexible thermal conductor;

[0062] 610-connection part;

[0063] 620-heat conduction part;

[0064] 700-seals;

[0065] 710-Sealed cavity.

[0066] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0067] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0068] As shown in the background technology, in the prior art, the liquid cooling plate is connected to the lower shell of the battery pack circuit breaker unit, and heat is dissipated by making the copper busbar directly contact with the liquid cooling plate. However, since the copper busbar is not a regular shape, the plane in contact with the liquid cooling plate is not a smooth plane, resulting in the lower surface of the copper busbar not being able to fully contact with the liquid cooling plate, and the thickness of different copper busbars is also different. The surface of the liquid cooling plate is a complete plane. After the liquid cooling plate is connected to the lower shell, some copper busbars with lower thickness may not be able to contact the liquid cooling plate. Therefore, the method of direct contact of the copper busbar with the liquid cooling plate for heat dissipation will result in a smaller heat dissipation area of the copper busbar and poor heat dissipation effect.

[0069] In response to the above technical problems, an embodiment of the present application provides a battery pack disconnect unit and a battery pack, wherein the battery pack disconnect unit includes an upper shell, an electrical component, a lower shell, a liquid cooling component, at least two copper bars and at least two flexible heat conductive parts, wherein the upper shell and the lower shell are connected to form a receiving cavity together, the electrical component is arranged in the receiving cavity, the copper bar is embedded in the lower shell, the two opposite sides of the copper bar are electrically connected to the electrical component and the flexible heat conductive part respectively, the heat generated by the electrical component is transferred out through the copper bar, the two opposite sides of the flexible heat conductive part are connected to the copper bar and the liquid cooling component respectively, and the liquid cooling component is connected to the lower shell to press the flexible heat conductive part between the copper bar and the liquid cooling component. Since the hardness of the flexible heat conductive part is relatively low, after the flexible heat conductive part is pressed, it can be fully contacted with the outer surface of the copper bar, i.e., the liquid cooling component, effectively increasing the heat dissipation area of the copper bar, thereby improving the heat dissipation efficiency. At the same time, since the thickness and size of each copper busbar may vary, at least two flexible thermal conductors are provided, and the flexible thermal conductors correspond one to one with the copper busbars. Different flexible thermal conductors can be selected according to the different shapes of the copper busbars, thereby ensuring that each copper busbar is in full contact with the flexible thermal conductors and that each copper busbar is effectively dissipated. Therefore, the battery pack disconnect unit provided by this application effectively increases the heat dissipation area of the copper busbars and improves the heat dissipation effect by providing a flexible thermal conductor between the lower shell and the liquid cooling assembly.

[0070] The following specific embodiments are used to describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The following embodiments of the present application are described in conjunction with the accompanying drawings:

[0071] It should be noted that the battery pack disconnect unit provided in the embodiments of the present application can be applied to various different battery packs.

[0072] See also Figure 1 、 Figure 2 、 Figure 4 、 Figure 8 and Figure 9 As shown, the battery pack circuit breaker unit of the embodiment of the present application includes an upper shell 100, an electrical component 200, a lower shell 300, a liquid cooling component 400, at least two copper bars 500 and at least two flexible thermal conductive parts 600; the upper shell 100 is connected to the lower shell 300, and the upper shell 100 and the lower shell 300 together form a accommodating cavity 120, and the electrical component 200 is located in the accommodating cavity 120; the copper bar 500 is embedded in the lower shell 300, one side of the copper bar 500 is electrically connected to the electrical component 200, and the side of the copper bar 500 facing away from the electrical component 200 is connected to the flexible thermal conductive parts 600 one by one, and the side of each flexible thermal conductive part 600 facing away from the copper bar 500 is connected to the liquid cooling component 400; the liquid cooling component 400 is connected to the side of the lower shell 300 facing away from the upper shell 100.

[0073] In an embodiment of the present application, the upper shell 100 and the lower shell 300 are detachably connected, and the upper shell 100 and the lower shell 300 together form a accommodating cavity 120. The electrical component 200 is the main element for realizing the power distribution, protection and management functions of the battery pack circuit breaker unit. The specific structure of the electrical component 200 and the arrangement of its internal components are not limited in this embodiment of the present application. For example, the electrical component 200 includes a shunt 220, a temperature sensor 210, a main negative relay 230, a fast charging negative relay 240, a fast charging positive relay 250, a main positive relay 260 and an excitation fuse 270, wherein the shunt 220, the main negative relay 230, the fast charging negative relay 240, the fast charging positive relay 250 and the main positive relay 260 are respectively electrically connected to a copper bus 500, so the number and shape of the copper bus 500 are determined by the corresponding electrical components of the electrical component 200, and are not limited in this embodiment of the present application.

[0074] The electrical components 200 generate a significant amount of heat during use, so the copper busbars 500 are needed to transfer this heat to the liquid cooling assembly 400. The liquid cooling assembly 400 then dissipates the heat, ensuring that the electrical components 200 operate within a normal temperature range. Because each copper busbar 500 corresponds to a different electrical component, its size and thickness may vary. Furthermore, the copper busbars 500 themselves are not smooth and flat. Direct contact with the liquid cooling assembly 400 may result in a smaller contact area and poorer heat dissipation.

[0075] Therefore, a flexible thermal conductive member 600 is arranged between the copper busbar 500 and the liquid cooling assembly 400. One side of the flexible thermal conductive member 600 is connected to the copper busbar 500, and the other side of the flexible thermal conductive member 600 is connected to the liquid cooling assembly 400. The number of flexible thermal conductive members 600 corresponds to the number of copper busbars 500.

[0076] Among them, the flexible thermal conductive member 600 is a thermal conductive structure with low hardness. Its specific material is not limited in the embodiments of this application. For example, the flexible thermal conductive member 600 is a thermal conductive silicone pad. The thermal conductive silicone has good thermal conductivity and insulation. Therefore, the flexible thermal conductive member 600 can not only transfer heat from the copper bus 500 to the liquid cooling assembly 400, but also avoid the short circuit inside the battery pack circuit breaker unit caused by electrical conduction, which may cause damage to the battery pack circuit breaker unit, thereby improving the safety factor of the battery pack circuit breaker unit during use. At the same time, the thermal conductive silicone also has good high temperature resistance and waterproof properties. The flexible thermal conductive member 600 is set on the surface of the copper bus 500. Even when the temperature of the copper bus 500 is high, the flexible thermal conductive member 600 can still be used normally. The waterproof property of the thermal conductive silicone can also prevent the condensation formed by the contact between the hot air between the lower shell 300 and the liquid cooling assembly 400 and the liquid cooling assembly 400 from falling on the copper bus 500, thereby reducing the insulation and voltage resistance performance of the copper bus 500.

[0077] Furthermore, due to the low hardness of the flexible heat conductive member 600, after the lower shell 300 is connected to the liquid cooling assembly 400, the flexible heat conductive member 600 can be pressed between the copper busbar 500 and the liquid cooling assembly 400, and the flexible heat conductive member 600 will be slightly deformed, thereby making more complete contact with the surface of the copper busbar 500, thereby increasing the contact area between the copper busbar 500 and the flexible heat conductive member 600, increasing the heat dissipation area, and thus improving the heat dissipation efficiency. Among them, since the thickness and shape of each copper busbar 500 may be different, the shape and thickness of each flexible heat conductive member 600 can be adjusted according to its corresponding copper busbar 500. The embodiment of the present application does not impose any restrictions on this. It is sufficient to ensure that the flexible heat conductive member 600 is in full contact with both the copper busbar 500 and the liquid cooling assembly 400.

[0078] Thus, by arranging the flexible heat-conducting member 600 between the copper busbar 500 and the liquid cooling assembly 400, the heat dissipation area of the copper busbar 500 can be increased by increasing the contact area between the copper busbar 500 and the flexible heat-conducting member 600, thereby improving the overall heat dissipation efficiency. In addition, while improving the heat dissipation efficiency, the flexible heat-conducting member 600 can also ensure the insulation and voltage resistance performance of the copper busbar 500, thereby ensuring the safe and stable operation of the battery pack circuit breaker unit. Since the battery pack circuit breaker unit provided in the embodiment of the present application can increase the heat dissipation area of the copper busbar 500, under the premise of ensuring the same heat dissipation effect, the volume of the copper busbar 500 required for the battery pack circuit breaker unit provided in the embodiment of the present application is reduced, which is also beneficial to saving the production cost of the battery pack circuit breaker unit and reducing the space occupied by the copper busbar 500.

[0079] Among them, the copper busbar 500 can be embedded in the lower shell 300 through the injection molding process and form a whole with the lower shell 300. In this way, when assembling the battery pack circuit breaker unit, it is only necessary to install the various components of the electrical component 200 one by one on the copper busbar 500, without the need for additional reinforcement of the copper busbar 500, which can effectively improve the assembly efficiency of the battery pack circuit breaker unit and save assembly costs. A through groove can also be opened in the lower shell 300, and the copper busbar 500 can be embedded in the through groove. The specific connection method of the copper busbar 500 and the lower shell 300 is not limited in the embodiment of this application, and it is sufficient to ensure the normal operation of the electrical component 200 and a stable connection with the flexible heat conductive member 600.

[0080] In some possible implementations, see Figure 1 、 Figure 2 and Figure 9 As shown, the embodiment of the present application also includes a seal 700; the liquid cooling assembly 400 is connected to the lower shell 300, and the seal 700 is arranged between the liquid cooling assembly 400 and the lower shell 300. The seal 700, the liquid cooling assembly 400 and the lower shell 300 together form a sealed cavity 710, and the flexible thermal conductive member 600 is located in the sealed cavity 710.

[0081] In the specific implementation, since the flexible heat conductive member 600 has a certain thickness, there is a gap between the liquid cooling assembly 400 and the lower shell 300. When the temperature of the battery pack circuit breaker unit is high, hot air is formed between the lower shell 300 and the liquid cooling assembly 400. The contact of the hot air with the liquid cooling assembly 400 will form condensation. Since the air temperature between the lower shell 300 and the liquid cooling assembly 400 is higher than the air temperature outside the battery pack circuit breaker unit, air convection is formed between the lower shell 300 and the liquid cooling assembly 400, which will drive more Water vapor enters between the lower shell 300 and the liquid cooling assembly 400 and contacts the liquid cooling assembly 400 to form condensation. The condensation adheres to the lower shell 300 and the copper busbar 500 and may affect the insulation and voltage resistance performance of the copper busbar 500. Therefore, a seal 700 is provided between the liquid cooling assembly 400 and the lower shell 300. The seal 700, the liquid cooling assembly 400 and the lower shell 300 together form a sealed cavity 710, thereby preventing air convection, reducing the generation of condensation, and ensuring the safe and stable operation of the battery pack circuit breaker unit.

[0082] In some possible implementations, see Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, a plurality of mounting grooves 310 are provided on a surface of the lower shell 300 facing away from the upper shell 100 in the embodiment of the present application; the mounting grooves 310 are correspondingly arranged around the circumference of the copper busbar 500, the flexible thermal conductive member 600 is connected to the mounting grooves 310, and the projection of the copper busbar 500 toward the flexible thermal conductive member 600 is located inside the flexible thermal conductive member 600.

[0083] In some embodiments, the mounting groove 310 is provided along the edge of the copper busbar 500. The shape of the mounting groove 310 is consistent with that of the copper busbar 500. The flexible thermal conductive member 600 is engaged with the mounting groove 310, thereby being fixed to the lower housing 300 and tightly fitting with the copper busbar 500. The mounting groove 310 and the flexible thermal conductive member 600 both match the shape of the copper busbar 500, allowing the flexible thermal conductive member 600 to fully contact the copper busbar 500 and improve the efficiency of the flexible thermal conductive member 600. In addition, the engagement of the flexible thermal conductive member 600 with the mounting groove 310 facilitates improved assembly efficiency of the battery pack disconnect unit, and allows for quick replacement of the flexible thermal conductive member 600 if it is damaged.

[0084] In some possible implementations, see Figure 3 、 Figure 4 and Figure 7 As shown, the flexible heat-conducting member 600 of the embodiment of the present application includes a connecting portion 610 and a heat-conducting portion 620 ; the connecting portion 610 is arranged around the circumference of the heat-conducting portion 620 , and the connecting portion 610 is snap-fitted to the mounting groove 310 so that the heat-conducting portion 620 is pressed tightly against the copper bus 500 .

[0085] It can be understood that the shape of the flexible thermal conductive member 600 matches the copper busbar 500, and a connecting portion 610 is provided on the peripheral side of the flexible thermal conductive member 600. The connecting portion 610 is engaged with the mounting groove 310 on the peripheral side of the copper busbar 500, so that the flexible thermal conductive member 600 can completely cover the copper busbar 500, so that the thermal conductive portion 620 is in contact with the copper busbar 500, wherein the thermal conductive portion 620 can be provided as a raised structure to increase the pressure of the thermal conductive portion 620 on the copper busbar 500, so that the thermal conductive portion 620 can be better pressed on the copper busbar 500, thereby increasing the contact area between the copper busbar 500 and the thermal conductive portion 620, and improving the heat dissipation efficiency.

[0086] In some possible implementations, see Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the electrical component 200 of the embodiment of the present application includes at least one temperature sensor 210; the temperature sensor 210 is set on the copper bus 500, and the temperature sensor 210 is used to detect the temperature of the copper bus 500; when the temperature is greater than or equal to the preset value, the liquid cooling component 400 is turned on.

[0087] It should be noted that the number and installation position of the temperature sensors 210 can be determined according to the overall size and layout of the battery pack circuit breaker unit. The specific number is not limited in the embodiments of this application. For example, two temperature sensors 210 are provided, one at the negative pole and the other at the positive pole, which are respectively used to detect the temperature of the current flowing in and out. The two temperature sensors 210 are respectively connected to the two copper bars 500, and each temperature sensor 210 is electrically connected to the battery management system. When at least one temperature sensor 210 detects a temperature greater than or equal to a preset value, the battery management system controls the liquid cooling component 400 to turn on and start heat dissipation. When the temperature detected by each temperature sensor 210 is lower than the preset temperature value, the battery management system controls the liquid cooling component 400 to turn off, thereby ensuring that the battery pack circuit breaker unit always operates within a normal temperature range, thereby improving the safety and stability of the operation of the battery pack circuit breaker unit.

[0088] In some possible implementations, see Figures 1 to 5 As shown, the liquid cooling assembly 400 of the embodiment of the present application includes a first liquid cooling plate 410 and a second liquid cooling plate 420; the first liquid cooling plate 410 is connected to the seal 700, and a liquid outlet 440 and a liquid inlet 430 are opened on one of the first liquid cooling plate 410 and the second liquid cooling plate 420, and the first liquid cooling plate 410 and the second liquid cooling plate 420 form a liquid cooling cavity, and the liquid outlet 440 and the liquid inlet 430 are both connected to the liquid cooling cavity; the liquid outlet 440 and the liquid inlet 430 are both used to connect with the supply device of the cooling medium, so that the cooling medium enters the liquid cooling cavity through the liquid inlet 430 and flows out of the liquid cooling cavity through the liquid outlet 440.

[0089] In specific implementation, when the battery management system controls the liquid cooling component 400 to turn on, the cooling medium flows from the cooling medium supply device into the liquid cooling cavity, and then flows out of the liquid cooling cavity back to the cooling medium supply device to achieve circulation, ensuring that the first liquid cooling plate 410 remains in a low temperature state. The flexible heat conductor 600 is connected to the first liquid cooling plate 410 to transfer heat from the copper bus 500 to the first liquid cooling plate 410 to complete heat dissipation. When the liquid cooling component 400 is turned off, it is only necessary to stop injecting the cooling medium and discharge the cooling medium in the liquid cooling cavity.

[0090] In some possible implementations, see Figure 2 、 Figure 4 、 Figure 5 and Figure 6 As shown, a circulation groove 421 is provided on the second liquid cooling plate 420 of the embodiment of the present application; the circulation groove 421 and the first liquid cooling plate 410 together form a liquid cooling cavity.

[0091] It should be noted that the circulation groove 421 and the liquid cooling cavity of the first liquid cooling plate 410 are tubular structures, which can concentrate the cooling medium at the circulation groove 421. Under the condition of a certain flow rate per unit time, the cooling medium is concentrated through the circulation groove 421, which can increase the flow rate of the cooling medium, allowing it to take away heat faster and improve the heat dissipation efficiency.

[0092] Furthermore, the position of the circulation groove 421 can be set below the copper bus 500, so that the part with the lowest temperature of the first liquid cold plate 410 is in contact with the thermal conductive silicone pad, thereby achieving faster cooling and improving the cooling effect. The circulation groove 421 can be set to a U-shaped structure, a U-shaped structure, etc. Its specific shape is not limited in the embodiment of the present application, and it is sufficient to enable the cooling medium to flow through the bottom of the copper bus 500 as much as possible.

[0093] In some possible implementations, see Figure 2 and Figure 4 As shown, an epoxy resin protective layer is provided on the outer surface of the copper busbar 500 in the embodiment of the present application.

[0094] Specifically, the epoxy resin protective layer can be a layer of composite modified epoxy resin paint sprayed on the outer surface of the copper busbar 500. Epoxy resin has excellent heat resistance and electrical insulation, which can improve the pressure resistance and insulation of the copper busbar 500, thereby ensuring the safe and stable operation of the battery pack circuit breaker unit. At the same time, the composite modified epoxy resin paint also has the advantages of strong adhesion to metal and not easy to fall off. In actual production, a layer of composite modified epoxy resin paint can be sprayed on the copper busbar 500 first, and then the copper busbar 500 can be injection molded onto the lower shell 300 to complete the assembly of the copper busbar 500 and the lower shell 300. The epoxy resin protective layer can also be other forms of epoxy resin parts, which are not limited in this embodiment of the present application. It only needs to play a protective role on the copper busbar 500.

[0095] In some possible implementations, see Figure 1 and Figure 2 As shown, a plurality of clips 110 are arranged at intervals on the circumference of one of the upper shell 100 and the lower shell 300 of the embodiment of the present application, and a plurality of hooks 320 are arranged at intervals on the circumference of the other of the upper shell 100 and the lower shell 300; the clips 110 are connected with the hooks 320 in a one-to-one correspondence.

[0096] In some embodiments, the upper shell 100 and the lower shell 300 are detachably connected together by a snap 110 and a hook 320. When the battery pack circuit breaker unit is to be inspected, the upper shell 100 can be directly removed and the electrical component 200 in the accommodating cavity 120 can be inspected, thereby improving the inspection efficiency of the battery pack circuit breaker unit.

[0097] See also Figure 1 、 Figure 2 and Figure 9 As shown, an embodiment of the present application further provides a battery pack, comprising a battery pack body and any one of the above-mentioned battery pack disconnecting units arranged on the battery pack body.

[0098] Among them, the structure and working principle of the battery pack disconnect unit are described in detail in the above embodiments and will not be repeated here.

[0099] In the embodiment of the present application, the battery pack circuit breaker unit has high heat dissipation efficiency. By arranging the battery pack circuit breaker unit on the battery pack body, the safety and stability of the battery pack operation can be effectively improved.

[0100] In summary, the battery pack circuit breaker unit and battery pack provided in the embodiment of the present application, the battery pack circuit breaker unit includes an upper shell 100, an electrical component 200, a lower shell 300, a liquid cooling component 400, at least two copper bars 500 and at least two flexible heat conductive parts 600, the electrical component 200 is arranged in the accommodating cavity 120 surrounded by the upper shell 100 and the lower shell 300 and is connected to the copper bar 500, the electrical component 200 will generate a large amount of heat during use, the heat is transferred to the liquid cooling component 400 through the copper bar 500 to achieve heat dissipation, the flexible heat conductive part 600 is pressed between the copper bar 500 and the liquid cooling component 400, so that the two opposite sides of the flexible heat conductive part 600 are fully in contact with the copper bar 500 and the liquid cooling component 400, respectively, thereby increasing the heat dissipation area of the copper bar 500 and thereby improving the heat dissipation efficiency of the battery pack circuit breaker unit, thereby ensuring the safety and stability of the battery pack operation.

[0101] In the description of the embodiments of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0102] In the embodiments of the present application, any device or element referred to or implied must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise specifically specified.

[0103] The terms "first," "second," "third," "fourth," and so on (if any) in the description and claims of the embodiments of the present application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein, for example, can be implemented in an order other than those illustrated or described herein.

[0104] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0105] It will be understood that the various numerical numbers involved in the embodiments of the present application are merely distinctions for the convenience of description and are not intended to limit the scope of the embodiments of the present application.

[0106] It can be understood that in the embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0107] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0108] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery pack disconnect unit, characterized in that: It comprises an upper housing (100), an electrical component (200), a lower housing (300), a liquid cooling component (400), at least two copper bars (500), and at least two flexible heat conducting members (600); The upper shell (100) is connected to the lower shell (300), and the upper shell (100) and the lower shell (300) together form a receiving cavity (120), and the electrical component (200) is located in the receiving cavity (120); The copper busbar (500) is embedded in the lower housing (300), one side of the copper busbar (500) is electrically connected to the electrical component (200), one side of the copper busbar (500) facing away from the electrical component (200) is connected to the flexible heat-conducting members (600) in a one-to-one correspondence, and one side of each flexible heat-conducting member (600) facing away from the copper busbar (500) is connected to the liquid cooling component (400); The liquid cooling assembly (400) is connected to a side of the lower shell (300) facing away from the upper shell (100).

2. The battery pack disconnect unit according to claim 1, wherein: Also included is a seal (700); The liquid cooling component (400) is connected to the lower shell (300), the sealing member (700) is arranged between the liquid cooling component (400) and the lower shell (300), the sealing member (700), the liquid cooling component (400) and the lower shell (300) together form a sealed cavity (710), and the flexible heat conductive member (600) is located in the sealed cavity (710).

3. The battery pack disconnect unit according to claim 1, wherein: A plurality of mounting grooves (310) are provided on a surface of the lower shell (300) facing away from the upper shell (100); The mounting groove (310) is correspondingly arranged around the circumference of the copper busbar (500), the flexible heat-conducting member (600) is connected to the mounting groove (310), and the projection of the copper busbar (500) toward the flexible heat-conducting member (600) is located inside the flexible heat-conducting member (600).

4. The battery pack disconnect unit according to claim 3, wherein: The flexible heat-conducting member (600) comprises a connecting portion (610) and a heat-conducting portion (620); The connecting portion (610) is arranged around the circumference of the heat conducting portion (620), and the connecting portion (610) is engaged with the mounting groove (310) so that the heat conducting portion (620) is pressed tightly against the copper busbar (500).

5. The battery pack disconnect unit according to claim 1, wherein: The electrical component (200) includes at least one temperature sensor (210); The temperature sensor (210) is arranged on the copper busbar (500), and the temperature sensor (210) is used to detect the temperature of the copper busbar (500); When the temperature is greater than or equal to a preset value, the liquid cooling component (400) is turned on.

6. The battery pack disconnect unit according to claim 2, characterized in that: The liquid cooling assembly (400) comprises a first liquid cooling plate (410) and a second liquid cooling plate (420); The first liquid cooling plate (410) is connected to the sealing member (700), a liquid outlet (440) and a liquid inlet (430) are provided on one of the first liquid cooling plate (410) and the second liquid cooling plate (420), the first liquid cooling plate (410) and the second liquid cooling plate (420) form a liquid cooling cavity, and the liquid outlet (440) and the liquid inlet (430) are both in communication with the liquid cooling cavity; The liquid outlet (440) and the liquid inlet (430) are both used to communicate with a supply device for a cooling medium, so that the cooling medium enters the liquid cooling cavity through the liquid inlet (430) and flows out of the liquid cooling cavity through the liquid outlet (440).

7. The battery pack disconnect unit according to claim 6, characterized in that: A circulation groove (421) is provided on the second liquid cooling plate (420); The circulation groove (421) and the first liquid cooling plate (410) together form the liquid cooling cavity.

8. The battery pack disconnect unit according to any one of claims 1 to 7, characterized in that: An epoxy resin protective layer is provided on the outer surface of the copper busbar (500).

9. The battery pack disconnect unit according to any one of claims 1 to 7, characterized in that: A plurality of buckles (110) are provided at intervals on the circumference of one of the upper shell (100) and the lower shell (300), and a plurality of hooks (320) are provided at intervals on the circumference of the other of the upper shell (100) and the lower shell (300); The buckles (110) are engaged with the hooks (320) in a one-to-one correspondence.

10. A battery pack, characterized in that: The invention comprises a battery pack body and a battery pack circuit breaker unit according to any one of claims 1 to 9, which is arranged on the battery pack body.

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