Battery protection device, battery and electric equipment

Abstract

The utility model discloses a protection device of a battery, the battery and electric equipment. The protection device of the battery comprises an anode fuse and a cathode fuse, an airbag assembly; the triggering assemblies are electrically connected with the positive electrode fuse and the negative electrode fuse respectively, the triggering assemblies are located at the two ends of the air bag assembly respectively, and when the triggering assemblies are triggered, the triggering assemblies deform in the direction of the air bag assembly; the positive electrode fuse and the negative electrode fuse are respectively arranged at the positive electrode end and the negative electrode end of the battery, and the electric connection between the trigger assembly and the air bag assembly is controlled by utilizing the heat generated by the battery, so that when the internal temperature of the battery reaches a temperature threshold value, the trigger assembly can be electrically connected with the air bag assembly; and the internal circuit of the battery is timely disconnected, so that explosion caused by further fire of the battery can be avoided, and the battery is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a battery protection device, a battery and electrical equipment. Background Art

[0002] In the related technology, lithium-ion batteries have the advantages of high energy density, high capacity, small size, and environmental protection, and are currently widely used in the field of new energy vehicles. However, when abnormal conditions such as short circuits occur inside the battery, local thermal runaway usually occurs, and further induces other side reactions, the internal pressure of the battery increases, and in severe cases, explosions or fires and other safety accidents occur. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery protection device, which can disconnect the internal circuit of the battery in time when the internal temperature of the battery reaches a temperature threshold, thereby avoiding further fire and explosion of the battery, thereby protecting the battery.

[0004] The utility model further provides a battery.

[0005] The utility model further provides an electrical device.

[0006] According to the battery protection device of the utility model, it includes: a positive pole fuse and a negative pole fuse; an airbag assembly; a trigger assembly, wherein the trigger assembly is electrically connected to the positive pole fuse and the negative pole fuse respectively, and the trigger assembly is respectively located at the two ends of the airbag assembly, and when the trigger assembly is triggered, the trigger assembly is deformed in the direction of the airbag assembly so that the trigger assembly is in contact with and electrically connected to the airbag assembly.

[0007] According to the protection device of the utility model, a positive electrode fuse and a negative electrode fuse are respectively arranged at the positive and negative ends of the battery, and the heat generated by the battery is used to control the electrical connection between the trigger component and the airbag component. In this way, when the internal temperature of the battery reaches the temperature threshold, the internal circuit of the battery can be disconnected in time, thereby avoiding explosion caused by further fire of the battery and achieving protection of the battery.

[0008] In some examples of the utility model, the airbag assembly includes: a conductive shell; the trigger assembly includes: a connecting piece and a deformable piece, the connecting piece is electrically connected to the positive pole fuse and the negative pole fuse respectively, the deformable piece is electrically connected to the connecting piece, and when the trigger assembly is triggered, the deformable piece is deformed toward the conductive shell, contacts and electrically connects to the conductive shell.

[0009] In some examples of the present invention, the deformable member is connected to the connecting member by welding; or the deformable member is connected to the connecting member by adhesive bonding; or the deformable member is connected to the connecting member by a fastener.

[0010] In some examples of the present invention, the airbag assembly further includes: an airbag structural component, which is arranged on the inner side of the conductive shell, and a flame retardant component is arranged inside the airbag structural component; the trigger assembly further includes: a piercing component, which is connected to a side of the deformable component adjacent to the airbag structural component, and when the deformable component is deformed toward the conductive shell, the piercing component pierces the airbag structural component.

[0011] In some examples of the present invention, through holes are provided at both ends of the conductive shell, and when the piercing member pierces the airbag structural member, the flame retardant member is discharged through the through holes.

[0012] In some examples of the present invention, the deformable member deforms in a first direction, and in a second direction perpendicular to the first direction, the size of the through hole is a, and the size of the deformable member when not deformed is b, and the relationship between a and b is: a>b / 2.

[0013] In some examples of the present invention, the connecting member and the deforming member are metal members, and the airbag structural member is a silicone airbag member.

[0014] According to the battery of the utility model, it includes: a shell; a battery cell, wherein the battery cell is arranged in the shell, and a positive electrode ear and a negative electrode ear are arranged on the battery cell; a cover plate, wherein the cover plate is arranged on the shell, and a positive electrode column and a negative electrode column are arranged on the cover plate; the protection device of the battery described above, wherein the positive electrode fuse is electrically connected between the positive electrode ear and the positive electrode column, the negative electrode fuse is electrically connected between the negative electrode ear and the negative electrode column, and the airbag assembly and the trigger assembly are arranged on the cover plate.

[0015] In some examples of the present invention, a circulation channel is provided on the cover plate, a through hole is opened on the airbag assembly, the circulation channel is communicated with the through hole, and the circulation channel is communicated with the interior of the shell.

[0016] In some examples of the present invention, the battery further includes: an insulating member, wherein the insulating member is disposed between the positive electrode tab and the positive electrode column, and between the negative electrode tab and the negative electrode column.

[0017] In some examples of the present invention, the electrical device includes: the battery described above.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a schematic diagram of a battery according to an embodiment of the utility model;

[0021] Figure 2 is a schematic diagram of a battery protection device according to an embodiment of the utility model;

[0022] Figure 3 is a first partial schematic diagram of a battery according to an embodiment of the utility model;

[0023] Figure 4 It is a second partial schematic diagram of a battery according to an embodiment of the utility model.

[0024] Reference numerals:

[0025] 1. Battery protection device;

[0026] 10. Positive electrode fuse; 20. Negative electrode fuse; 30. Airbag assembly; 31. Conductive shell; 311. Through hole; 32. Airbag structure; 40. Trigger assembly; 41. Connector; 42. Deformation member; 43. Puncture member; 2. Shell; 3. Battery cell; 301. Positive electrode ear; 302. Negative electrode ear; 4. Cover plate; 401. Positive electrode column; 402. Negative electrode column; 403. Flow channel; 5. Insulator; 6. Battery. DETAILED DESCRIPTION

[0027] The embodiments of the present utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model are described in detail below.

[0028] Reference below Figure 1-Figure 4 A battery protection device 1 according to an embodiment of the present utility model is described.

[0029] like Figure 1 and Figure 2As shown, the battery protection device 1 according to the embodiment of the utility model includes: a positive fuse 10, a negative fuse 20, an airbag assembly 30 and a trigger assembly 40. Among them, the positive fuse 10 and the negative fuse 20 can both play a role in protecting the circuit to prevent the occurrence of circuit overload and short circuit. It should be noted that the positive fuse 10 can be electrically connected to the positive pole of the battery 6, and the negative fuse 20 can be electrically connected to the negative pole of the battery 6. The airbag assembly 30 is mainly used for electrical connection and gas storage. The trigger assembly 40 mainly plays a triggering role.

[0030] like Figure 1 and Figure 2 As shown, the trigger assembly 40 is electrically connected to the positive fuse 10 and the negative fuse 20 respectively, and the trigger assembly 40 is located at both ends of the airbag assembly 30 respectively. When the trigger assembly 40 is triggered, the trigger assembly 40 deforms in the direction of the airbag assembly 30 so that the trigger assembly 40 and the airbag assembly 30 are in contact and electrically connected. The trigger assembly 40 is electrically connected to the positive fuse 10 and the negative fuse 20 respectively. It should be noted that there can be two trigger assemblies 40, and the two trigger assemblies 40 can be connected in series with the positive fuse 10 and the negative fuse 20 respectively, so that the current can flow between the corresponding trigger assembly 40 and the positive fuse 10, and between the corresponding trigger assembly 40 and the negative fuse 20 respectively.

[0031] The two trigger assemblies 40 are arranged at both ends of the airbag assembly 30. This arrangement is more reasonable, and the trigger assemblies 40 can cooperate with the airbag assembly 30 from both sides of the airbag assembly 30. Specifically, when the internal temperature of the battery 6 is greater than or equal to the threshold temperature, the trigger assemblies 40 on both sides reach the trigger condition, and the trigger assemblies 40 on both sides will deform toward one side of the airbag assembly 30, so that the trigger assemblies 40 on both sides can contact and electrically connect with the airbag assembly 30. In this way, a current path is formed between the positive fuse 10, the trigger assembly 40, the airbag assembly 30, the trigger assembly 40 and the negative fuse 20, and the current can flow in the path. It should be noted that since the positive fuse 10 and the negative fuse 20 are respectively arranged at the positive terminal and the negative terminal of the battery 6, when the current flows between the paths, the battery 6 will be short-circuited, so that the positive fuse 10 and the negative fuse 20 will be disconnected due to the short circuit, and the internal circuit of the battery 6 will be broken, thereby avoiding the explosion caused by further fire of the battery 6 and achieving protection of the battery 6.

[0032] Therefore, by respectively arranging the positive electrode fuse 10 and the negative electrode fuse 20 at the positive and negative ends of the battery 6, and utilizing the heat generated by the battery 6 to control the electrical connection between the trigger assembly 40 and the airbag assembly 30, when the internal temperature of the battery 6 reaches the temperature threshold, the battery 6 can be short-circuited, and the internal circuit of the battery 6 can be disconnected in time, thereby avoiding the explosion caused by further fire of the battery 6 and achieving protection of the battery 6.

[0033] In addition, if Figure 3 and Figure 4 As shown, the airbag assembly 30 includes: a conductive shell 31; the trigger assembly 40 includes: a connector 41 and a deformable member 42, the connector 41 is electrically connected to the positive fuse 10 and the negative fuse 20 respectively, and the deformable member 42 is electrically connected to the connector 41. When the trigger assembly 40 is triggered, the deformable member 42 deforms toward the conductive shell 31, contacts with the conductive shell 31 and is electrically connected. Among them, the conductive shell 31 mainly plays a conductive role, and the conductive shell 31 can also form the external structure of the airbag assembly 30, so as to support the airbag assembly 30 and facilitate the installation of other corresponding components in the airbag assembly 30.

[0034] The connecting member 41 mainly plays a connecting role, and the deforming member 42 mainly plays a deformation triggering role. The connecting member 41 is connected to the positive fuse 10 and the negative fuse 20 respectively. Similarly, there are two connecting members 41, so that the positive fuse 10 can be electrically connected to the corresponding trigger assembly 40 through the corresponding connecting member 41. The negative fuse 20 can be electrically connected to the corresponding trigger assembly 40 through the corresponding connecting member 41.

[0035] The deformable member 42 is electrically connected to the connecting member 41. When the temperature inside the battery 6 reaches a threshold value, the deformable member 42 will be deformed by the heat and come into contact with the conductive shell 31, so that the deformable member 42 can be electrically connected to the conductive shell 31, and then the conductive shell 31 can be electrically connected to the positive fuse 10 and the negative fuse 20 on both sides. In this way, a current path can be formed between the positive fuse 10, the trigger component 40, the conductive shell 31, the trigger component 40 and the negative fuse 20, so that the battery 6 can be short-circuited and the internal circuit of the battery 6 can be disconnected.

[0036] In addition, the deformable member 42 is connected to the connecting member 41 by welding; or the deformable member 42 is connected to the connecting member 41 by bonding; or the deformable member 42 is connected to the connecting member 41 by fasteners. In other words, the fixing method between the deformable member 42 and the connecting member 41 can be in various forms. For example, the connection method between the deformable member 42 and the connecting member 41 can be welding, and the welding connection method can make the connection between the deformable member 42 and the connecting member 41 more stable. For another example, the connection method between the deformable member 42 and the connecting member 41 can be bonding, and the bonding connection method can make the connection between the deformable member 42 and the connecting member 41 more convenient and increase the assembly speed.

[0037] Furthermore, if Figure 3 and Figure 4 As shown, the airbag assembly 30 further includes an airbag structure 32, which is arranged inside the conductive shell 31, and a flame retardant is arranged inside the airbag structure 32; the trigger assembly 40 further includes a needle-piercing member 43, which is connected to the side of the deformable member 42 adjacent to the airbag structure 32, and when the deformable member 42 is deformed toward the conductive shell 31, the needle-piercing member 43 pierces the airbag structure 32. Among them, the airbag structure 32 mainly plays the role of storing gas. The airbag structure 32 is arranged inside the conductive shell 31, which is more reasonable, and the conductive shell 31 can be used to protect the airbag structure 32, and it is also convenient to install the airbag structure 32. The flame retardant mainly plays the role of flame retardancy. The flame retardant is arranged inside the airbag structure 32, which is convenient for storing the flame retardant. Since the airbag structure 32 is easy to break, it is also convenient to release the flame retardant later.

[0038] The needle-piercing member 43 mainly plays a piercing role. The needle-piercing member 43 is connected to the side of the deformable member 42 adjacent to the airbag structural member 32, so that the connection between the needle-piercing member 43 and the airbag assembly 30 can be more stable, and the needle-piercing member 43 can be closer to the airbag structural member 32, so that the needle-piercing member 43 and the airbag structural member 32 can be matched. Specifically, when the battery 6 is abnormal and the temperature rises to a threshold, the deformable member 42 deforms and contacts the conductive shell 31, causing the battery 6 to short-circuit and disconnect the battery 6. The needle-piercing member 43 will move toward the airbag structural member 32 under the drive of the deformable member 42 and pierce the airbag structural member 32, so that the flame retardant in the airbag structural member 32 will flow out, thereby preventing the battery 6 from burning. Among them, the flame retardant can be an inert flame-retardant gas such as helium.

[0039] In addition, if Figure 3 and Figure 4As shown, through holes 311 are provided at both ends of the conductive shell 31. When the piercing member 43 pierces the airbag structural member 32, the flame retardant is discharged through the through holes 311. Among them, the through holes 311 mainly play the role of piercing and discharging the flame retardant. Specifically, in the process of the deformable member 42 being heated and deformed, the piercing members 43 on both sides can respectively pierce the through holes 311 on both sides to cooperate with the airbag structural member 32 and pierce the airbag structural member 32. Since the airbag structural member 32 is pierced, the flame retardant inside the airbag structural member 32 will flow out through the puncture port, and then flow out of the conductive shell 31 through the through hole 311, so that the inside of the battery 6 can be flame-retarded. Through holes 311 are provided on both sides, which can increase the release speed of the flame retardant and facilitate flame retardancy.

[0040] In addition, if Figure 3 As shown, the deformable member 42 is deformed in the first direction, and in the second direction perpendicular to the first direction, the size of the through hole 311 is a, and the size of the deformable member 42 when not deformed is b, and the relationship between a and b is: a>b / 2. That is, in the second direction, the size of the through hole 311 and the size of the deformable member 42 when not deformed need to meet a certain range, that is: in the second direction, the size of the through hole 311 needs to be greater than half of the size of the deformable member 42 when not deformed, so that it can be ensured that after the deformable member 42 is deformed, it can contact with the conductive shell 31, so that when the temperature inside the battery 6 reaches the threshold, the battery 6 can be short-circuited, the battery 6 can be disconnected in time, and the flame retardant can be released for flame retardancy, and the deformable member 42 will not completely block the through hole 311.

[0041] It should be noted that the center of the deformable part 42 can be opposite to the upper side of the through hole 311. In this way, while ensuring that the needle-pierced part 43 can cooperate with the airbag structural part 32, the deformable part 42 can contact the upper side of the conductive shell 31 after deformation, thereby leaving a gap at the bottom of the through hole 311 to facilitate the flame retardant to flow out of the gap.

[0042] Specifically, the connector 41 and the deformable member 42 are metal parts, and the airbag structural member 32 is a silicone airbag member. In other words, both the connector 41 and the deformable member 42 can be metal structural members. The connector 41 is a metal structural member, which can transmit electrical energy and improve the structural strength of the connector 41, making it less prone to damage. It should be noted that the deformable member 42 can be made of memory metal, that is, the deformable member 42 will deform when heated, and will return to its original shape when the heat disappears. This arrangement is more reasonable, the structure is simple and convenient, and it can be reused. In addition, the airbag structural member 32 can be a silicone airbag member, which has the advantages of good corrosion resistance and a long service life.

[0043] like Figure 1As shown, the battery 6 according to the embodiment of the utility model includes: a shell 2, a battery cell 3, a cover plate 4 and a battery protection device 1. The battery cell 3 is arranged in the shell 2, and a positive electrode ear 301 and a negative electrode ear 302 are arranged on the battery cell 3. Among them, the positive electrode ear 301 and the negative electrode ear 302 can both play the role of electrical connection. The electric energy inside the battery cell 3 can flow out from the positive electrode ear 301, and after passing through the external components, it will flow back from the negative electrode ear 302 to the inside of the battery cell 3, so as to provide electric energy for the corresponding components. It should be noted that a positive electrode connecting piece is connected to the positive electrode ear 301, and a negative electrode connecting piece is connected to the negative electrode ear 302.

[0044] In addition, if Figure 1 and Figure 2 As shown, the cover plate 4 is covered on the housing 2, and the cover plate 4 is provided with a positive electrode column 401 and a negative electrode column 402. The cover plate 4 mainly plays the role of covering and installation. The cover plate 4 is arranged on the housing 2, so that the housing 2 can be sealed, thereby protecting the battery cell 3 inside the housing 2 and avoiding interference with the external environment. The positive electrode column 401 and the negative electrode column 402 can also play the role of electrical connection.

[0045] In addition, if Figure 1 and Figure 2 As shown, the positive electrode fuse 10 is electrically connected between the positive electrode ear 301 and the positive electrode column 401, the negative electrode fuse 20 is electrically connected between the negative electrode ear 302 and the negative electrode column 402, and the airbag assembly 30 and the trigger assembly 40 are arranged on the cover plate 4. It should be noted that a positive electrode lead-out sheet may be arranged on the positive electrode column 401, and a negative electrode lead-out sheet may be connected to the negative electrode column 402. The positive electrode fuse 10 is electrically connected between the positive electrode ear 301 and the positive electrode column 401. Specifically, the positive electrode ear 301 is electrically connected to the positive electrode connecting sheet, and the positive electrode connecting sheet and the positive electrode lead-out sheet are both electrically connected to the positive electrode fuse 10. In this way, a current path can be formed between the positive electrode ear 301, the positive electrode connecting sheet, the positive electrode fuse 10, the positive electrode lead-out sheet and the positive electrode column 401. It should be noted that the positive electrode column 401 and the cover plate 4 , as well as the negative electrode column 402 and the cover plate 4 , are both insulated from each other.

[0046] Similarly, the negative electrode fuse 20 is electrically connected between the negative electrode ear 302 and the negative electrode column 402. Specifically, the negative electrode ear 302 is electrically connected to the negative electrode connecting piece, and the negative electrode connecting piece and the negative electrode lead-out piece are both electrically connected to the negative electrode fuse 20. In this way, a current path can be formed between the negative electrode ear 302, the negative electrode connecting piece, the negative electrode fuse 20, the negative electrode lead-out piece and the negative electrode column 402.

[0047] Since the positive electrode column 401 is welded to the corresponding connector 41, and the negative electrode column 402 is also welded to the corresponding connector 41, when the deformable member 42 contacts the conductive shell 31, a current path can be formed between the positive electrode ear 301 and the negative electrode ear 302 of the battery 6, causing a short circuit in the battery 6, so that the inside of the battery 6 can be disconnected in time to protect the battery 6.

[0048] Furthermore, if Figure 2 As shown, a circulation channel 403 is provided on the cover plate 4, and a through hole 311 is provided on the airbag assembly 30. The circulation channel 403 is connected to the through hole 311, and the circulation channel 403 is connected to the interior of the shell 2. Among them, the circulation channel 403 mainly plays a circulation role. The circulation channel 403 is connected to the through hole 311, so that when the needle-piercing member 43 punctures the airbag structural member 32, the flame retardant inside the airbag structural member 32 will flow into the circulation channel 403 through the through hole 311. Because the circulation channel 403 is connected to the interior of the shell 2, the flame retardant can further enter the interior of the shell 2 through the circulation channel 403, so that the battery cell 3 inside the shell 2 can be flame-retarded to prevent the battery cell 3 from catching fire and exploding.

[0049] In addition, if Figure 1 and Figure 2 As shown, the battery 6 further includes an insulating member 5, which is disposed between the positive electrode ear 301 and the positive electrode column 401, and between the negative electrode ear 302 and the negative electrode column 402. The insulating member 5 mainly plays an insulating role and can protect the battery 6. Specifically, the insulating member 5 is disposed between the positive electrode ear 301 and the positive electrode column 401, and the insulating member 5 is disposed between the negative electrode ear 302 and the negative electrode column 402, so that a short circuit between the positive electrode ear 301 and the positive electrode column 401 and a short circuit between the negative electrode ear 302 and the negative electrode column 402 can be avoided, thereby protecting the battery 6.

[0050] The electrical equipment according to the embodiment of the utility model comprises: the battery 6 described in the above embodiment.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] In the description of the present utility model, "first feature" and "second feature" may include one or more of the features. In the description of the present utility model, "plurality" means two or more. In the description of the present utility model, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. In the description of the present utility model, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0054] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery protection device (1), characterized in that: include: A positive electrode fuse (10) and a negative electrode fuse (20); Airbag assembly (30); A trigger component (40), the trigger component (40) being electrically connected to the positive electrode fuse (10) and the negative electrode fuse (20), and the trigger component (40) being located at two ends of the airbag component (30), respectively. When the trigger component (40) is triggered, the trigger component (40) is deformed in the direction of the airbag component (30), so that the trigger component (40) and the airbag component (30) are in contact and electrically connected.

2. The battery protection device (1) according to claim 1, characterized in that: The airbag assembly (30) comprises: a conductive shell (31); The trigger assembly (40) comprises: a connecting piece (41) and a deforming piece (42); the connecting piece (41) is electrically connected to the positive electrode fuse (10) and the negative electrode fuse (20) respectively; the deforming piece (42) is electrically connected to the connecting piece (41); when the trigger assembly (40) is triggered, the deforming piece (42) deforms in the direction of the conductive shell (31), contacts with the conductive shell (31) and is electrically connected thereto.

3. The battery protection device (1) according to claim 2, characterized in that: The deformable member (42) is connected to the connecting member (41) by welding; or The deformable member (42) is bonded to the connecting member (41); or The deformable member (42) and the connecting member (41) are connected via a fastener.

4. The battery protection device (1) according to claim 2, characterized in that: The airbag assembly (30) further comprises: an airbag structural component (32), wherein the airbag structural component (32) is arranged on the inner side of the conductive shell (31), and a flame retardant component is arranged inside the airbag structural component (32); The trigger assembly (40) further comprises: a piercing member (43), wherein the piercing member (43) is connected to a side of the deformable member (42) adjacent to the airbag structural member (32), and when the deformable member (42) is deformed in the direction of the conductive shell (31), the piercing member (43) pierces the airbag structural member (32).

5. The battery protection device (1) according to claim 4, characterized in that: Through holes (311) are provided at both ends of the conductive shell (31), and when the piercing member (43) pierces the airbag structural member (32), the flame retardant member is discharged through the through holes (311).

6. The battery protection device (1) according to claim 5, characterized in that: The deformable member (42) is deformed in a first direction, and in a second direction perpendicular to the first direction, the size of the through hole (311) is a, and the size of the deformable member (42) when not deformed is b, and the relationship between a and b is: a>b / 2.

7. The battery protection device (1) according to claim 4, characterized in that: The connecting piece (41) and the deforming piece (42) are metal pieces, and the airbag structural piece (32) is a silicone airbag piece.

8. A battery (6), characterized in that: include: Housing (2); A battery cell (3), the battery cell (3) being arranged in the housing (2), and the battery cell (3) being provided with a positive electrode lug (301) and a negative electrode lug (302); A cover plate (4), the cover plate (4) being arranged on the shell (2), and the cover plate (4) being provided with a positive electrode column (401) and a negative electrode column (402); The battery protection device (1) according to any one of claims 1 to 7, wherein the positive electrode fuse (10) is electrically connected between the positive electrode ear (301) and the positive electrode column (401), the negative electrode fuse (20) is electrically connected between the negative electrode ear (302) and the negative electrode column (402), and the airbag assembly (30) and the trigger assembly (40) are arranged on the cover plate (4).

9. The battery (6) according to claim 8, characterized in that The cover plate (4) is provided with a circulation channel (403), the airbag assembly (30) is provided with a through hole (311), the circulation channel (403) is in communication with the through hole (311), and the circulation channel (403) is in communication with the interior of the shell (2).

10. The battery (6) according to claim 8, characterized in that Also includes: An insulating member (5), wherein the insulating member (5) is arranged between the positive electrode tab (301) and the positive electrode column (401), and between the negative electrode tab (302) and the negative electrode column (402).

11. An electrical device, characterized in that: include: The battery (6) according to any one of claims 8 to 10.

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