Fuse, battery pack and electric equipment

Abstract

The utility model relates to the technical field of fuses, and provides a fuse, a battery pack and electric equipment, the fuse comprises a high-voltage connecting piece, an igniter and a cutter part, the high-voltage connecting piece is used for being electrically connected with a high-voltage circuit, the cutter part is located between the igniter and the high-voltage connecting piece, and the cutter part is arranged close to the igniter. The device further comprises a pressure detector and a controller, the pressure detector is used for detecting the air pressure around the fuse, the controller is electrically connected with the igniter and the pressure detector, and the controller is used for conveying high-voltage current to the igniter when the air pressure is higher than a preset value so that the igniter can detonate. Therefore, the cutter piece is pushed to move towards the high-voltage connecting piece and cut off the high-voltage connecting piece. According to the fuse provided by the embodiment of the invention, signal propagation paths can be effectively reduced, and the trigger speed of the fuse can be effectively accelerated, so that the response speed of the fuse is effectively improved, and the safety of a battery is improved.

Description

Technical Field

[0001] This application relates to the field of fuse technology, and more particularly to a fuse, battery pack and electrical equipment. Background Technology

[0002] Battery packs are typically equipped with fuses, which are used to cut off the high-voltage circuit in the battery pack in case of abnormal conditions, in order to reduce or avoid safety accidents.

[0003] The fuse is typically electrically connected to the battery management controller. A pressure sensor, also electrically connected to the battery management controller, is also installed in the battery pack. The pressure sensor detects the air pressure within the battery pack. When the pressure sensor detects that the air pressure exceeds a preset value, it sends a signal to the battery management controller, causing the controller to trigger the fuse, thereby breaking the high-voltage circuit in the battery pack.

[0004] However, after the pressure sensor detects an abnormal air pressure inside the battery pack, it still needs to go through the battery management controller to trigger the fuse, which results in a slow response speed and reduces the response efficiency of the fuse. Utility Model Content

[0005] This application provides a fuse, a battery pack, and an electrical device that can effectively accelerate the triggering speed of the fuse, thereby effectively improving the response speed of the fuse and enhancing battery safety.

[0006] One aspect of this application provides a fuse for use in a battery, comprising:

[0007] A high-voltage connector, used for electrical connection with a high-voltage circuit;

[0008] Ignition device;

[0009] A cutting component is located between the igniter and the high-voltage connecting piece, and the cutting component is positioned close to the igniter;

[0010] A pressure detector for detecting the air pressure around the fuse;

[0011] The controller is electrically connected to the igniter and the pressure detector. When the gas pressure is higher than a preset value, the controller is used to deliver a high-voltage current to the igniter so that the igniter is ignited, thereby pushing the cutter to move toward the high-voltage connecting piece and cut off the high-voltage connecting piece.

[0012] This embodiment of the application places a pressure detector inside the fuse and electrically connects the pressure detector to the controller within the fuse. When the pressure detector detects that the gas pressure inside the battery pack exceeds a preset value, it can directly send a signal to the controller in the fuse to trigger the igniter. This eliminates the need to transmit the signal to the battery management controller, which then sends the signal to the fuse. In other words, by eliminating the need for the battery management controller, the signal propagation path is effectively reduced, significantly accelerating the fuse's triggering speed and thus improving the fuse's response speed and battery safety.

[0013] In one possible implementation, a first connecting line is also included, one end of which is electrically connected to the igniter and the other end of which is electrically connected to the battery management controller.

[0014] In one possible implementation, a second connecting wire is also included, one end of which is electrically connected to the igniter and the other end of which is used for electrical connection to the vehicle airbag.

[0015] In one possible implementation, a housing is also included, the housing having a sealed cavity in which both the igniter and the cutter are located.

[0016] In one possible implementation, the housing includes:

[0017] Upper casing,

[0018] The upper cover covers the upper housing, and a first receiving cavity is provided between the upper housing and the upper cover, with the controller located within the first receiving cavity.

[0019] In one possible implementation, the upper housing has a second receiving cavity formed on the side opposite to the cover, and the igniter is located within the second receiving cavity.

[0020] In one possible implementation, the housing further includes:

[0021] An intermediate housing is connected to the upper housing. The intermediate housing has a third receiving cavity, which is connected to the second receiving cavity. The cutting element is located in the third receiving cavity.

[0022] In one possible implementation, a cutter retainer is also included, which is located within the third receiving cavity;

[0023] The cutter holder has a cutter receiving cavity, which communicates with the second receiving cavity, and at least a portion of the cutter is located within the cutter receiving cavity.

[0024] In one possible implementation, the cutter includes a cutter end and a body end connected to each other;

[0025] Along the body end to the cutter end, the cross-sectional size of the cutter gradually decreases, and the size of the end of the body end away from the cutter end is larger than the cross-sectional size of the cutter receiving cavity;

[0026] The body end is engaged at one end of the cutter receiving cavity near the second receiving cavity, and the cutter end is located in the cutter receiving cavity and extends toward the high-voltage connecting piece.

[0027] In one possible implementation, the intermediate housing has a positioning step, and the cutter fixing member has a limiting portion that mates with the positioning step, the limiting portion abutting against the positioning step.

[0028] In one possible implementation, the housing further includes:

[0029] The lower housing is connected to the intermediate housing and has a fourth receiving cavity that is connected to the cutter receiving cavity. At least a portion of the high-pressure connecting piece is located within the fourth receiving cavity.

[0030] In one possible implementation, the high-voltage connecting piece includes a central portion and connecting portions located on both sides of the central portion;

[0031] The middle part is located inside the fourth receiving cavity, and the connecting part extends out of the lower housing to be connected to the high-voltage circuit.

[0032] In one possible implementation, the thickness of the intermediate portion is less than the thickness of the connecting portion.

[0033] A second aspect of this application provides a battery pack including any of the fuses described above;

[0034] The battery pack has a high-voltage circuit, which is electrically connected to the high-voltage connecting piece in the fuse.

[0035] A third aspect of this application provides an electrical device including the battery pack described above. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of a fuse provided in an embodiment of this application;

[0038] Figure 2 This is a schematic diagram of a fuse with its top cover removed, provided in an embodiment of this application.

[0039] Figure 3 A cross-sectional view of a fuse provided in an embodiment of this application;

[0040] Figure 4 An exploded view of a fuse provided in an embodiment of this application;

[0041] Figure 5 Wiring diagram of the fuse scheme provided in the embodiments of this application;

[0042] Figure 6 A control logic diagram of a fuse provided in an embodiment of this application;

[0043] Figure 7 This is a control flowchart of a fuse provided in an embodiment of this application.

[0044] Figure label:

[0045] 100-Fuse;

[0046] 110 - Outer shell; 111 - Upper shell; 1111 - First receiving cavity; 1112 - Second receiving cavity;

[0047] 112 - Top cover;

[0048] 113-Intermediate shell; 1131-Third receiving cavity; 1132-Positioning step;

[0049] 114 - Lower housing; 1141 - Fourth receiving cavity;

[0050] 120 - High-voltage connecting piece;

[0051] 130 - Ignition device; 131 - First connecting wire; 132 - Second connecting wire;

[0052] 140 - Cutting blade; 141 - Cutting blade end; 142 - Body end;

[0053] 150-Controller;

[0054] 160 - Pressure detector;

[0055] 170 - Cutter fixing part; 171 - Cutter receiving cavity; 172 - Limiting part. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0057] This application provides a battery pack and an electrical device including the battery pack, wherein the vehicle can be a car, bus, or truck. For example, the vehicle can be an electric vehicle, a pure electric vehicle, a hybrid electric vehicle, a range-extended electric vehicle, a plug-in hybrid electric vehicle, a new energy vehicle, or any vehicle with a battery.

[0058] The following explanation uses a vehicle as an example of an electrical appliance.

[0059] The vehicle may also include a body, axles, and a motor, wherein the battery pack, axles, and motor may all be mounted on the body. The battery pack may be electrically connected to the motor, and the motor may be connected to the axle. The battery pack provides power to the motor, enabling it to rotate. During rotation, the motor drives the axle to rotate, thus allowing the vehicle to move.

[0060] The battery pack may include a fuse, which can disconnect the high-voltage circuit in the battery in the event of an accident, thereby reducing or preventing the accident from happening.

[0061] As described in the background section above, fuses are typically electrically connected to the battery management controller. A pressure sensor, also electrically connected to the battery management controller, is also installed in the battery pack. The pressure sensor detects air pressure within the battery pack. When the pressure sensor detects that the air pressure exceeds a preset value, it sends a signal to the battery management controller, causing the controller to trigger the fuse, thereby breaking the high-voltage circuit in the battery pack.

[0062] However, after the pressure sensor detects an abnormal air pressure inside the battery pack, it still needs to go through the battery management controller to trigger the fuse, which is slow and reduces the response speed of the fuse.

[0063] To address the aforementioned issues, this application provides a fuse by incorporating a pressure detector within the fuse and electrically connecting it to a controller within the fuse. When the pressure detector detects that the gas pressure within the battery pack exceeds a preset value, it can directly send a signal to the controller within the fuse to trigger the igniter. This eliminates the need to transmit the signal to the battery management controller, which then sends the signal to the fuse. In other words, by bypassing the battery management controller, the signal propagation path is effectively reduced, significantly accelerating the fuse's triggering speed and thus improving its response time and battery safety.

[0064] The fuses provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0065] Figure 1 This is a schematic diagram of the structure of a fuse provided in an embodiment of this application. Figure 2 This is a schematic diagram of a fuse with its top cover removed, provided in an embodiment of this application. Figure 3 This is a cross-sectional view of a fuse provided in an embodiment of this application.

[0066] This application provides a fuse 100, which can be installed inside a battery pack. See [link to relevant documentation]. Figure 1 and Figure 2 As shown, fuse 100 may include a high-voltage connecting piece 120, which can be used for electrical connection to a high-voltage circuit. For example, see... Figure 1 and Figure 2 As shown, the portion of the high-voltage connecting piece 120 extending outside the fuse 100 can be used for electrical connection with a high-voltage circuit.

[0067] See Figure 3 As shown, the fuse 100 may further include an igniter 130 and a cutter 140. The cutter 140 may be located between the igniter 130 and the high-voltage connecting piece 120, and the cutter 140 may be positioned close to the igniter 130. When the igniter 130 is detonated, it can push the cutter 140 to move rapidly toward the high-voltage connecting piece 120 to cut off the high-voltage connecting piece 120, thereby disconnecting the high-voltage circuit in the battery pack.

[0068] Specifically, the battery pack may also include a pressure detector 160 and a controller 150. The pressure detector 160 can be used to detect the air pressure around the fuse 100. For example, the pressure detector can be a pressure sensor. The fuse 100 can be located inside the battery pack, so the pressure detector 160 can detect the air pressure inside the battery pack.

[0069] The controller 150 can be electrically connected to the igniter 130 and the pressure detector 160. The gas pressure detected by the pressure detector 160 can be transmitted to the controller 150. The controller 150 can be used to deliver a high-voltage current to the igniter 130 when the gas pressure detected by the pressure detector is higher than a preset value, so that the igniter 130 is ignited. After detonation, the igniter 130 can push the cutter 140 to move towards the high-voltage connecting piece 120 and cut off the high-voltage connecting piece 120.

[0070] In other words, when the pressure detector 160 located inside the fuse 100 detects that the air pressure exceeds a preset standard value, it will directly send a signal to the controller 150 in the fuse 100 to trigger the igniter 130 to detonate. This eliminates the need to transmit the signal to the battery management controller, which then sends the signal to the fuse 100. This effectively reduces the signal propagation path, speeds up the triggering of the fuse 100, and thus effectively improves the response speed of the fuse 100.

[0071] In this embodiment, a pressure detector 160 is placed inside the fuse 100 and electrically connected to a controller 150 within the fuse 100. When the pressure detector 160 detects that the gas pressure inside the battery pack exceeds a preset value, it can directly send a signal to the controller 150 in the fuse 100 to trigger the igniter 130. This eliminates the need to transmit the signal to the battery management controller, which then sends the signal to the fuse 100. In other words, by eliminating the need for the battery management controller, the signal propagation path is effectively reduced, significantly accelerating the triggering speed of the fuse 100 and thus improving its response speed and battery safety.

[0072] Figure 4 This is an exploded view of a fuse provided in an embodiment of this application. Figure 5 This is a wiring diagram for a fuse provided in an embodiment of this application. Figure 6 This application provides a control logic diagram for a fuse. Figure 7 This is a control flowchart of a fuse provided in an embodiment of this application.

[0073] See Figure 3 and Figure 4 As shown, the fuse 100 may further include a first connecting line 131, one end of which is electrically connected to the igniter 130, and the other end is used to electrically connect to the battery management controller. The battery manager can send a trigger signal to the fuse 100 through the first connecting line 131, so that the igniter 130 in the fuse 100 can be detonated, thereby pushing the cutter 140 to cut off the high-voltage electrical connection piece.

[0074] For example, see Figure 5As shown, the battery management controller can be electrically connected to other sensors in the vehicle. When the vehicle is involved in an accident, the sensors on the vehicle can detect abnormal signals and transmit the signals to the battery management controller. The battery management controller can also send a trigger signal to the fuse 100 so that the high-voltage circuit in the battery pack can be cut off in time, preventing the battery pack from exploding in case of an accident, thus helping to improve the safety of the battery pack.

[0075] See also Figure 4 As shown, the fuse 100 may further include a second connecting wire 132, one end of which is electrically connected to the igniter 130, and the other end is used for electrical connection to the vehicle airbag. For example, in combination with Figure 5 As shown, when the vehicle's airbags are triggered in an unexpected situation, the airbags can send a trigger signal to the fuse 100 so that the high-voltage connecting piece 120 in the fuse 100 can be disconnected in time. This reduces or avoids safety accidents such as the battery pack exploding due to the high-voltage circuit connection in an unexpected situation, and helps to improve the safety of the battery pack and the vehicle.

[0076] See Figure 6 As shown, in this embodiment of the application, the fuse 100 can be controlled by the internal pressure sensor and the external battery management controller so that the fuse 100 disconnects the high-voltage circuit in an emergency to improve battery safety.

[0077] For details, see Figure 7 As shown, fuse 100 can be detonated through at least three paths: a pressure sensor located inside fuse 100, the airbag, and other sensors. Specifically, when the pressure sensor inside fuse 100 detects an abnormal signal, it can directly input a high-voltage current to ignite 130 to detonate ignite 130, thereby cutting off the high-voltage connection piece 120. When the airbag detects a collision signal, it can input a signal to the battery management controller, which can then input a high-voltage current to ignite 130 to detonate it, thereby cutting off the high-voltage connection piece 120. When other sensors detect abnormal signals, such as overcurrent signals, they can also transmit signals to the battery management controller, enabling the battery management controller to input a high-voltage current to ignite 130 to detonate it, thereby cutting off the high-voltage connection piece 120.

[0078] See also Figure 3 and Figure 4As shown, the fuse 100 may further include a housing 110, which has a sealed cavity in which the igniter 130 and the cutter 140 are both located. When the igniter 130 is detonated, it generates a large shock wave in all directions. This shock wave pushes the cutter 140 toward the high-voltage connecting piece 120, thereby severing the high-voltage connecting piece 120. By placing both the igniter 130 and the cutter 140 within the sealed cavity, the shock wave generated after the igniter 130 detonates can be prevented from overflowing to the outside of the housing 110, thus avoiding any adverse impact on the safety of the battery pack. Moreover, by placing both the igniter 130 and the cutter 140 within the sealed cavity, the cavity of the housing 110 can be prevented from communicating with the outside, thus preventing the shock wave generated by the igniter 130 from overflowing and reducing the pushing force on the cutter 140. This helps to increase the pushing force on the cutter 140 and improve the response speed of the fuse 100.

[0079] See also Figure 3 and Figure 4 As shown, the outer casing 110 may include an upper casing 111 and an upper cover 112. The upper cover 112 may cover the upper casing 111, and a first receiving cavity 1111 may be formed between the upper casing 111 and the upper cover 112. The controller 150 may be located within the first receiving cavity 1111. The first receiving cavity 1111 provides a receiving space for the controller 150, providing sealed protection for the controller 150, reducing or preventing controller 150 malfunctions, thereby effectively improving the reliability and stability of the controller 150's operation.

[0080] See also Figure 3 and Figure 4 As shown, a second receiving cavity 1112 can be formed on the side of the upper housing 111 facing away from the upper cover 112, and the igniter 130 can be located within the second receiving cavity 1112. For example, as shown in the figure, the middle part of the upper housing 111 can be recessed towards the controller 150 to form the second receiving cavity 1112, and the igniter 130 can be located within the second receiving cavity 1112. The second receiving cavity 1112 and the first receiving cavity 1111 can be independent of each other, which can isolate the igniter 130 from the controller 150, reducing or avoiding damage to the controller 150 after the igniter 130 detonates, thus improving the protection of the controller 150.

[0081] See also Figure 3 and Figure 4As shown, the outer casing 110 may further include an intermediate casing 113, which may be connected to the upper casing 111. The intermediate casing 113 may have a third receiving cavity 1131, which may be connected to the second receiving cavity 1112. The cutter 140 may be located within the third receiving cavity 1131. The third receiving cavity 1131 provides space for the cutter 140. When the igniter 130 is detonated, the shock wave generated by the igniter 130 can propagate through the second receiving cavity 1112 to the third receiving cavity 1131, thereby impacting the cutter 140 within the receiving cavity. This pushes the cutter 140 toward the high-voltage connecting piece 120 to cut off the high-voltage connecting piece 120.

[0082] By connecting the third receiving cavity 1131 with the second receiving cavity 1112, the shock wave generated by the igniter 130 can quickly reach the cutter 140 to push it. This effectively improves the pushing effect on the cutter 140 and helps to enhance the response of the fuse 100.

[0083] See also Figure 3 and Figure 4 As shown, the fuse 100 may further include a cutter retainer 170, which may be located within a third receiving cavity 1131. For example, the cutter retainer 170 may be connected to the intermediate housing 113. The cutter retainer 170 may have a cutter receiving cavity 171, which may communicate with a second receiving cavity 1112. At least a portion of the cutter member 140 may be located within the cutter receiving cavity 171.

[0084] The cutter retainer 170 can provide a limit for the cutter 140 so that the cutter 140 can be kept in the original position before the igniter 130 is detonated, thereby reducing or avoiding the accidental fall of the cutter 140 when the igniter 130 is not detonated, and helping to improve the reliability and stability of the cutter 140 setting.

[0085] For details, see Figure 4 As shown, the cutter 140 may include a cutter end 141 and a body end 142 connected to each other. The cross-sectional size of the cutter 140 may gradually decrease from the body end 142 to the cutter end 141. For example, as shown in the figure, the cross-sectional shape of the cutter 140 may be triangular. The cutter end 141 has the smallest cross-sectional size and is the sharpest, and can be used to cut the high-voltage connecting piece 120.

[0086] The dimension of the end of the body 142 furthest from the cutter end 141 is larger than the cross-sectional dimension of the cutter receiving cavity 171. The body end 142 of the cutter 140 can be engaged at the end of the cutter receiving cavity 171 near the second receiving cavity 1112, and the cutter end 141 can be located in the cutter receiving cavity 171 and extend towards the high-pressure connecting piece 120. Since the dimension of the end of the cutter body 142 furthest from the cutter end 141 is larger than the cross-sectional dimension of the receiving cavity, the body end 142 can be engaged outside the cutter receiving cavity 171, so that the cutter fixing member 170 can provide limiting and fixing for the cutter 140. This can effectively reduce or avoid the cutter 140 from falling off, thereby effectively improving the reliability and firmness of the cutter 140 installation.

[0087] See also Figure 3 As shown, the intermediate housing 113 may have a positioning step 1132, and the cutter fixing member 170 may have a limiting part 172 that cooperates with the positioning step 1132. The limiting part 172 can abut against the positioning step 1132. Through the cooperation between the positioning step 1132 and the limiting part 172, the cutter fixing member 170 can be limited and fixed in the height direction of the fuse 100. This can prevent the cutter fixing member 170 from falling off, which helps to improve the reliability and firmness of the cutter fixing member 170 in the intermediate housing 113, thereby effectively improving the reliability and stability of the cutter member 140.

[0088] See also Figure 3 and Figure 4 As shown, the outer casing 110 may further include a lower casing 114, which may be connected to the intermediate casing 113. The lower casing 114 may have a fourth receiving cavity 1141, which may be connected to the cutter receiving cavity 171. At least a portion of the high-voltage connecting piece 120 may be located within the fourth receiving cavity 1141. When the igniter 130 is detonated, it can push the cutter 140 to move. At this time, under the shock wave of the igniter 130, the cutter 140 may move from the third receiving cavity 1131 to the fourth receiving cavity 1141 to cut the high-voltage connecting piece 120 within the fourth receiving cavity 1141, thereby cutting off the high-voltage circuit.

[0089] By connecting the fourth receiving cavity 1141 with the third receiving cavity 1131, the cutter 140 can smoothly move from the third receiving cavity 1131 to the fourth receiving cavity 1141 to cut the high-pressure connecting piece 120 inside the fourth receiving cavity 1141. This effectively reduces or avoids jamming of the cutter 140 during movement, helping to improve the reliability and stability of the cutter 140's movement.

[0090] The high-voltage connector 120 may include a central portion (not shown in the figure) and connecting portions located on both sides of the central portion. The central portion may be located within the fourth receiving cavity 1141, and the connecting portions may extend outside the lower housing 114 to connect to the high-voltage circuit. Only the connecting portions located outside the lower housing are shown in the figure; the central portion inside the lower housing is not shown.

[0091] This allows the high-voltage circuit within the battery pack to be connected via the high-voltage connecting piece 120, enabling the high-voltage circuit to function properly. When the igniter 130 detonates, it can push the cutter 140 to sever the middle portion of the high-voltage connecting piece 120, thus disconnecting the connecting parts on both sides of the middle portion and breaking the high-voltage circuit.

[0092] The thickness of the middle section can be less than that of the connecting section. This effectively reduces the structural strength and rigidity of the middle section, making it easier for the cutter 140 to cut it. It reduces or avoids cutting failures by the cutter 140, ensuring accurate cutting of the high-voltage connecting piece 120. This effectively reduces or avoids fuse 100 failure, thereby significantly improving the reliability and stability of the fuse 100.

[0093] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0094] In the description of this utility model, it should be understood that the terms "comprising" and "having" as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0095] Unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fuse for use in a battery, characterized in that, include: A high-voltage connecting piece (120) is used for electrical connection with a high-voltage circuit; Ignition device (130); A cutting blade (140) is located between the igniter (130) and the high-voltage connecting piece (120), and the cutting blade (140) is positioned close to the igniter (130). A pressure detector (160) is used to detect the air pressure around the fuse; A controller (150) is electrically connected to the igniter (130) and the pressure detector (160). The controller (150) is used to deliver a high-voltage current to the igniter (130) when the air pressure is higher than a preset value, so as to ignite the igniter (130) and thereby push the cutter (140) to move toward the high-voltage connecting piece (120) and cut off the high-voltage connecting piece (120).

2. The fuse according to claim 1, characterized in that, It also includes a first connecting line (131), one end of which is electrically connected to the igniter (130), and the other end is used to be electrically connected to the battery management controller.

3. The fuse according to claim 1 or 2, characterized in that, It also includes a second connecting line (132), one end of which is electrically connected to the igniter (130), and the other end is used to electrically connect to the vehicle airbag.

4. The fuse according to claim 1 or 2, characterized in that, It also includes a housing (110) having a sealed cavity, in which the igniter (130) and the cutter (140) are both located.

5. The fuse according to claim 4, characterized in that, The outer casing (110) includes: Upper shell (111), The upper cover (112) covers the upper housing (111), and there is a first receiving cavity (1111) between the upper housing (111) and the upper cover (112), and the controller (150) is located in the first receiving cavity (1111).

6. The fuse according to claim 5, characterized in that, The upper housing (111) has a second receiving cavity (1112) on the side opposite to the upper cover (112), and the igniter (130) is located in the second receiving cavity (1112).

7. The fuse according to claim 6, characterized in that, The outer casing (110) also includes: The intermediate housing (113) is connected to the upper housing (111). The intermediate housing (113) has a third receiving cavity (1131) which is connected to the second receiving cavity (1112). The cutter (140) is located in the third receiving cavity (1131).

8. The fuse according to claim 7, characterized in that, It also includes a cutter retainer (170) located within the third receiving cavity (1131); The cutter holder (170) has a cutter receiving cavity (171) that communicates with the second receiving cavity (1112), and at least a portion of the cutter (140) is located within the cutter receiving cavity (171).

9. The fuse according to claim 8, characterized in that, The cutting blade (140) includes a cutting blade end (141) and a body end (142) connected to each other; Along the body end (142) to the cutter end (141), the cross-sectional size of the cutter (140) gradually decreases, and the size of the end of the body end (142) away from the cutter end (141) is larger than the cross-sectional size of the cutter receiving cavity (171); The body end (142) is engaged at one end of the cutter receiving cavity (171) near the second receiving cavity (1112), and the cutter end (141) is located in the cutter receiving cavity (171) and extends toward the high-voltage connecting piece (120).

10. The fuse according to claim 8 or 9, characterized in that, The intermediate housing (113) has a positioning step (1132), and the cutter fixing member (170) has a limiting part (172) that cooperates with the positioning step (1132), and the limiting part (172) abuts against the positioning step (1132).

11. The fuse according to claim 8 or 9, characterized in that, The outer casing (110) also includes: The lower housing (114) is connected to the intermediate housing (113). The lower housing (114) has a fourth receiving cavity (1141) which is connected to the cutter receiving cavity (171). At least a portion of the high-pressure connecting piece (120) is located in the fourth receiving cavity (1141).

12. The fuse according to claim 11, characterized in that, The high-voltage connecting piece (120) includes a middle part and connecting parts located on both sides of the middle part; The middle part is located inside the fourth receiving cavity (1141), and the connecting part extends out of the lower housing (114) to be connected to the high voltage circuit.

13. The fuse according to claim 12, characterized in that, The thickness of the middle part is less than the thickness of the connecting part.

14. A battery pack, characterized in that, Includes the fuse as described in any one of claims 1 to 13 above; The battery pack has a high-voltage circuit that is electrically connected to the high-voltage connecting piece (120) in the fuse.

15. An electrical appliance, characterized in that, Includes the battery pack as described in claim 14.

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