Battery pack and electric equipment

Abstract

The utility model discloses a battery pack. The battery pack comprises a box body with an accommodating cavity and a cover body which covers the box body along a first direction to seal the accommodating cavity, the circuit board assembly, the isolation piece and the battery cell are sequentially arranged in the containing cavity in the first direction. The accommodating cavity is divided into a first chamber and a second chamber which are sealed with each other by the separator; the circuit board assembly is located in the first cavity, the battery cell comprises a main body and a tab which are connected, the main body is located in the second cavity, and the tab penetrates through the separator and is connected with the circuit board assembly. When the main body is subjected to thermal runaway, sprayed corrosive gas, electrolyte and other impurities are blocked by the separator and only move in the second chamber or break through an air leakage structure of the battery pack, so that the gas, the electrolyte and the like are prevented from rushing into the first chamber; therefore, damage such as gas impact or electrolyte corrosion to the circuit board assembly is avoided, destructiveness during thermal runaway is reduced, and safety is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a battery pack and an electrical device. Background Art

[0002] Current battery packs are usually formed by arranging multiple single cells in a battery box in a certain pattern. The use scenarios of battery packs are complex and changeable, and thermal runaway of single cells may occur during use.

[0003] When thermal runaway occurs, a single cell will produce more volatile gases and spray electrolyte. Since the battery case is sealed inside, these gases and impurities will exert greater impact pressure on the battery case during the escape process, especially in the battery pack composed of soft-pack cells. The pressure generated by the gas and impurities is more dangerous. If the gas and impurities are sprayed from the top of the battery pack, it will cause serious damage to the electrical components on the top of the battery pack, which is very destructive to the battery pack. Utility Model Content

[0004] The present application provides a battery pack and electrical equipment to reduce the situation in which gas and pressure that may occur when the battery pack is under thermal runaway and break through the top of the battery to cause damage to electrical components.

[0005] A battery pack has a first orientation and includes:

[0006] A box body having a containing cavity;

[0007] A cover body, which is covered on the box body along the first direction to close the accommodating cavity;

[0008] A circuit board assembly and a battery cell, wherein the cover, the circuit board assembly and the battery cell are sequentially arranged along the first direction, and the circuit board assembly and the battery cell are accommodated in the accommodation cavity;

[0009] an isolating member disposed in the accommodating cavity, wherein the isolating member divides the accommodating cavity into a first chamber and a second chamber which are arranged along the first direction and sealed with each other;

[0010] The circuit board assembly is located in the first chamber, the battery cell includes a main body and a tab connected to each other, the main body is located in the second chamber, and the tab passes through the isolation piece and is connected to the circuit board assembly.

[0011] To implement the above technical solution, the isolation component isolates the accommodating cavity into two independently sealed first and second chambers, and the location where the battery cell is damaged and thermal runaway occurs is the main body. When thermal runaway occurs in the main body, the ejected corrosive gas and impurities such as electrolyte are blocked by the isolation component and will only flow in the second chamber or break through the venting structure of the battery pack, preventing these gases and electrolytes from rushing into the first chamber, thereby avoiding damage such as gas impact or electrolyte corrosion to the circuit board assembly, thereby reducing the destructiveness during thermal runaway and improving safety.

[0012] As one of the optional embodiments of the present scheme, the inner surface of the box body has an inner circumferential side surface parallel to the first direction, the outer circumferential side of the isolation member is sealedly connected to the inner circumferential side surface, the isolation member is provided with an avoidance hole for the pole ear to pass through, and the inner side surface of the avoidance hole is sealedly connected to the pole ear.

[0013] To implement the above technical solution, a specific structure of the isolation member is proposed in detail. The isolation member is sealed and fixedly connected to the inner peripheral side surface parallel to the first direction, which is relatively easy to process and manufacture.

[0014] As one of the optional embodiments of the present solution, a clamping portion is provided on the inner circumferential side surface, and the clamping portion and the isolating member form a clamping fit in a direction perpendicular to the first direction to limit the movement of the isolating member along the first direction.

[0015] To implement the above technical solution, the clamping portion can be a recessed groove arranged on the inner side surface or a protrusion arranged on the inner side surface toward the battery cell. The clamping portion and the isolating member are used to form a clamping fit to further improve the stability of the connection between the isolating member and the inner side surface, thereby improving the connection strength between the isolating member and the inner side surface and improving stability.

[0016] As one of the optional embodiments of the present solution, the isolation member is a glue layer formed by solidification of glue.

[0017] As one of the optional embodiments of the present solution, the box body includes a plurality of side panels parallel to the first direction, the side panels are provided with glue injection holes connected to the accommodating cavity, and the isolation member is provided to block the glue injection holes.

[0018] To implement the above technical solution, in the traditional technology, a glue injection hole is opened on the cover body, and the glue injection operation is performed from a first direction. However, this process requires the use of glue-blocking foam to block the glue to prevent the glue from flowing into the bottom of the box body, and finally the glue injection hole must be sealed, which will increase the cost and make the process complicated. During the glue layer processing, the glue is injected from the side panel, and the fluidity of the glue is used to achieve glue layer coverage, which effectively saves processing costs and improves processing convenience.

[0019] As one of the optional embodiments of the present scheme, the battery pack has a second direction and a third direction, the first direction, the second direction and the third direction intersect each other, the side panel includes a first side panel facing each other in the second direction and a second side panel facing each other in the third direction, the size of the second side panel in the second direction is larger than the size of the first side panel in the third direction, and the glue injection hole is opened on the first side panel.

[0020] As one of the optional embodiments of the present scheme, a plurality of battery cells are provided, and the plurality of battery cells are arranged in affixed manner along the third direction to form a battery cell module. An insulating plate is provided between the battery cell module and the inner peripheral side surface, and the insulating plate is located on the side of the isolation member away from the cover body. The insulating plate abuts against the inner peripheral side surface on one side of the third direction, and abuts against the outer side surface of the battery cell module on the other side of the third direction.

[0021] As one of the optional embodiments of this solution, the box body is further provided with a pressure relief member, the pressure relief member is connected to the second chamber, the pressure relief member has a rupture limit pressure P1, the isolation member has a rupture limit pressure P2, and P1 <P2。

[0022] To implement the above technical solution, the function of the pressure relief component is that when the gas pressure in the second chamber is too high, the gas can break through the pressure relief component and leak out, thereby avoiding the risk of the gas breaking through the isolation component, further ensuring the safety of the circuit board assembly in the first chamber.

[0023] As one of the optional embodiments of the present scheme, the box body includes a bottom plate arranged facing the cover body in the first direction, the bottom plate is provided with a snap-in groove on a side facing the cover body, the side plate is snap-fitted in the snap-in groove, and the pressure relief member is the bottom plate.

[0024] To implement the above technical solution, a specific structure of a pressure relief piece is proposed, and when the bottom plate is subjected to a large pressure, it will separate from the side plate, thereby achieving the effect of pressure relief.

[0025] As one of the optional embodiments of the present solution, the side panel is clamped in the clamping groove, and the side panel and the clamping groove are connected by gluing.

[0026] On the other hand, the present application also discloses an electrical device, which includes: a battery pack as described above.

[0027] One of the above technical solutions has the following advantages or beneficial effects:

[0028] 1. An isolator is provided in the battery pack, and the isolator isolates the accommodating cavity into two mutually independently sealed first and second chambers. The location where the battery cell is damaged and thermal runaway occurs is the main body. When thermal runaway occurs in the main body, the ejected corrosive gas and impurities such as electrolyte are blocked by the isolator and will only flow in the second chamber or break through the gas release structure of the battery pack, thereby preventing the gas and electrolyte from rushing into the first chamber, thereby avoiding gas impact or electrolyte corrosion and other damage to the circuit board assembly, thereby reducing the destructiveness during thermal runaway and improving safety;

[0029] 2. Setting the injection holes on the narrow side panels of the battery pack enables side injection of glue instead of injecting glue from the cover side as in traditional technology, thereby improving the injection efficiency and reducing the use of glue blocking foam, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0031] Figure 1 is an overall structural diagram of the battery pack provided in Example 1 of the present application;

[0032] Figure 2 is an exploded structural diagram of a battery pack provided in Example 1 of the present application;

[0033] Figure 3 It is an exploded structural diagram provided in Example 1 of the present application, mainly used to show the positional relationship between the battery cell, the circuit board assembly and the isolation member;

[0034] Figure 4 This is a cross-sectional view provided in Example 1 of the present application for showing the positional relationship between the battery cell and the circuit board assembly after the isolation member is deleted;

[0035] Figure 5a is a cross-sectional view of the connection relationship between the isolation member and the box body in one embodiment provided by the present application;

[0036] Figure 5b is a cross-sectional view of the connection relationship between the isolation member and the box body in another embodiment provided by the present application;

[0037] Figure 6 is a cross-sectional view of another shape structure of the isolation member provided in the present application;

[0038] Figure 7 is a cross-sectional view provided in an embodiment of the present application for showing a channel;

[0039] Figure 8 It is a cross-sectional view provided in an embodiment of the present application for showing the glue injection state.

[0040] Reference numerals: 1, box body; 11, accommodating chamber; 111, first chamber; 112, second chamber; 12, inner peripheral side; 121, clamping portion; 1a, side plate; 1a1, first side plate; 1a2, second side plate; 1a21, exhaust hole; 1b, bottom plate; 1b1, clamping groove;

[0041] 2. Cover body;

[0042] 3. Circuit board assembly;

[0043] 4. Soft-pack battery cell; 41. Main body; 42. Tab;

[0044] 5. Isolation piece; 51. Avoidance hole;

[0045] 6. Glue injection hole;

[0046] 7. Battery cell module; 8. Insulation board; 9. Pressure relief component; 15. Channel;

[0047] Z, first direction; X, second direction; Y, third direction. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article, unless otherwise specified, generally indicates that the associated objects before and after are in an "or" relationship.

[0050] The following is combined with Figure 1-8 The present application is further described.

[0051] Reference Figure 1 and Figure 2, is a battery pack disclosed in an embodiment of the present application, and the battery pack has a first direction Z, a second direction X and a third direction Y that intersect each other. The battery pack includes a box body 1 and a cover body 2, the box body 1 has a accommodating cavity 11, and the cover body 2 is covered on the box body 1 from the first direction Z to close the accommodating cavity 11. The battery pack also includes a circuit board assembly 3, an isolating member 5 and a soft-pack battery cell 4 arranged in the accommodating cavity 11, and the cover body 2, the circuit board assembly 3, the isolating member 5 and the soft-pack battery cell 4 are arranged in sequence along the first direction Z. Among them, a plurality of soft-pack battery cells 4 are provided, and a plurality of soft-pack battery cells 4 are stacked along the third direction Y to form a battery cell module 7. Among them, the circuit board assembly 3 in this embodiment refers to a circuit mainboard for realizing functions such as electrical conduction and charge and discharge control.

[0052] Reference Figure 3 and Figure 4 , the isolating member 5 separates the accommodating chamber 11 into a first chamber 111 and a second chamber 112. The first chamber 111 and the second chamber 112 are arranged along the first direction Z and sealed with each other. The first chamber 111 is close to the cover body 2, while the second chamber 112 is far away from the cover body 2. The circuit board assembly 3 is located in the first chamber 111. The soft-pack battery cell 4 includes a connected main body 41 and a tab 42. The main body 41 is located in the second chamber 112. The tab 42 is fixedly connected to one end of the main body 41 close to the circuit board assembly 3. The tab 42 penetrates the isolating member 5 and is electrically connected to the circuit board assembly 3 to achieve electrical conduction. Correspondingly, an avoidance hole 51 for the tab 43 to penetrate is opened on the isolating member 5. Among them, in this embodiment, the main body 41 refers to the whole body including the aluminum-plastic film and the core disposed inside the aluminum-plastic film.

[0053] The above setting enables the isolation member 5 to isolate the accommodating cavity 11 into two independently sealed first chambers 111 and second chambers 112. The location where the soft-pack battery cell 4 is damaged and thermal runaway occurs is the packaging portion of the main body 41. When the main body 41 undergoes thermal runaway, the ejected corrosive gas and impurities such as electrolyte are blocked by the isolation member 5 and will only flow in the second chamber 112 or break through the venting structure of the battery pack, thereby preventing the gas and electrolyte from rushing into the first chamber 111, thereby avoiding damage such as gas impact or electrolyte corrosion to the circuit board assembly 3, thereby reducing the destructiveness during thermal runaway and improving safety.

[0054] Reference Figure 2 and Figure 3 In this embodiment, the inner surface of the housing 1 has an inner peripheral side surface 12 parallel to the first direction Z, the outer peripheral side of the isolating member 5 is sealed and connected to the inner peripheral side surface 12, the isolating member 5 is provided with an avoidance hole 51 for the pole lug 42 to pass through, and the inner side surface of the avoidance hole 51 is sealed and connected to the pole lug 42. The isolating member 5 is sealed and fixedly connected to the inner peripheral side surface 12 parallel to the first direction Z, which is relatively easy to process and manufacture.

[0055] It should be noted that, in some other optional embodiments, the edge of the isolating member 5 may not be connected to the inner peripheral side surface 12, but may be connected to a side surface of the cover body 2 close to the circuit board assembly 3, for example Figure 6 The shape of the separator 5 is not limited to a flat plate, and the separator 5 can finally cooperate with the soft-pack battery cell 4 to separate the accommodating cavity 11 into two mutually sealed first chambers 111 and second chambers 112 .

[0056] It should be noted that in this embodiment, the spacer 5 is a glue layer formed after the glue solidifies, because the glue layer is easier to process and has a lower cost in the production process. However, in other optional embodiments, the spacer 5 can also be a solid structural layer such as a plastic part, as long as the spacer 5 and the inner peripheral side 12 are sealed and the avoidance hole 51 of the spacer 5 and the tab 42 are sealed to separate the accommodating cavity 11 into two mutually sealed first chambers 111 and second chambers 112.

[0057] It should be noted that in this embodiment, the spacer 5 is arranged on the shoulder of the main body 41 of the soft-pack battery cell 4, that is, the spacer 5 is arranged on the side of the main body 41 close to the circuit board assembly 3 and the side of the spacer 5 close to the main body 41 is in contact with the main body 41. Considering the influence of the expansion factor during the use of the soft-pack battery cell 4, a gap can also be left between the side of the spacer 5 close to the main body 41 and the main body 41 to buffer the expansion of the soft-pack battery cell 4. In addition, in other optional embodiments, the spacer 5 can also cover part of the main body 41.

[0058] Reference Figure 5a and Figure 5b In some optional embodiments, a clamping portion 121 is provided on the inner peripheral side surface 12, and the clamping portion 121 forms a clamping fit with the isolation member 5 in a direction perpendicular to the first direction Z to limit the movement of the isolation member 5 along the first direction Z. Figure 5a In the embodiment, the clamping portion 121 is configured as a raised portion on the inner peripheral side surface 12 facing the soft-pack battery core 4, and a recessed portion that matches the raised portion is configured on the spacer 5. The clamping engagement between the raised portion and the recessed portion enhances the stability of the connection between the spacer 5 and the box body 1. Figure 5b In the embodiment, the snap-fit ​​portion 121 is configured as a recessed groove on the inner peripheral side surface 12 facing away from the soft-pack battery core 4 , and the edge of the isolating member 5 is snap-fitted into the recessed groove to form a snap-fit ​​fit to improve the stability of the connection between the isolating member 5 and the inner peripheral side surface 12 .

[0059] When thermal runaway occurs in the main body 41 of the soft-pack battery cell 4, generally two situations will occur. The first is that the amount of gas released is small, and in this case, only the air pressure in the second chamber 112 will increase. The clamping fit formed between the isolation member 5 and the inner peripheral side surface 12 can effectively improve the connection stability of the isolation member 5, so as to ensure that the gas is not sufficient to damage the isolation member 5 to avoid damage to the circuit board assembly 3 in this case.

[0060] The second situation is that the amount of gas released is large, resulting in an increase in gas pressure. At this time, a pressure relief structure needs to be set on the battery pack to avoid damage to the isolation member 5. The pressure relief structure will be introduced in detail below.

[0061] Referring to Figure 4 , a pressure relief member 9 is also provided on the box body 1, and the pressure relief member 9 is communicated with the second chamber 112. In this embodiment, the connection between the bottom plate 1b and the side plate 1a forms the above-mentioned pressure relief member 9. When the gas pressure in the second chamber 112 is too high, the gas can break through the pressure relief member 9 and leak out, thus avoiding the risk of the gas breaking through the isolation member 5 and further ensuring the safety of the circuit board assembly 3 in the first chamber 111. In some other alternative embodiments, it is not excluded that the pressure relief member 9 is a weak structure provided on the box body 1 or a similar structure such as an explosion-proof valve. To ensure the realization of the above effects, it is stipulated in the design that the pressure relief member 9 has a rupture limit pressure P1, and the isolation member 5 has a rupture limit pressure P2, and P1 < P2. It should be noted that the rupture of the above-mentioned pressure relief member 9 refers to the destruction of the pressure relief member 9 itself or the destruction of the connection position between the pressure relief member 9 and the box body 1 so that the gas in the second chamber 112 can leak out. The same applies to the rupture of the isolation member 5. As for the design of the above rupture limit pressure, it can be set conventionally by the thickness, material strength, etc. of the isolation member 5.

[0062] Back to Figure 1 and Figure 2, the formation principle of the spacer 5 as a glue layer is explained below in combination with the structure of the battery pack. The box body 1 includes a side panel 1a parallel to the first direction Z and a bottom panel 1b located at the end of the side panel 1a away from the cover body 2, and the side panel 1a is connected to the bottom panel 1b. Among them, the side panel 1a includes two first side panels 1a1 facing each other in the second direction X and two second side panels 1a2 facing each other in the third direction Y. The adjacent first side panels 1a1 and the second side panels 1a2 are integrally connected, and the size of the second side panel 1a2 in the second direction X is greater than the size of the first side panel 1a1 in the third direction Y. A snap-in groove 1b1 is provided on one side of the bottom panel 1b facing the cover body 2, and the side panel 1a is snapped into the snap-in groove 1b1 and fixed by glue. A glue injection hole 6 connected to the accommodating cavity 11 is provided on the first side panel 1a1. The position of the glue injection hole 6 is flush with the spacer 5 in the first direction Z. The spacer 5 blocks the setting of the glue injection hole 6, that is, the glue injection hole 6 is connected to the first chamber 111. In order to discharge the gas in the accommodating cavity 11 during glue injection so as to make the glue injection smoother, an exhaust hole 1a21 is also provided on the second side plate 1a2, and the exhaust hole 1a21 is connected to the second chamber 112. An insulating plate 8 is provided between the battery cell module 7 and the inner peripheral side surface 12, and the insulating plate 8 is located on the side of the isolation member 5 away from the cover body 2. Two insulating plates 8 are provided and are respectively arranged on both sides of the battery cell module 7 in the third direction. One side of the insulating plate 8 in the third direction Y abuts against the inner peripheral side surface 12, and the other side of the insulating plate 8 in the third direction Y abuts against the outer side surface of the battery cell module 7.

[0063] In the conventional technology, the glue injection hole 6 is opened on the cover 2. When injecting glue, the first direction Z is parallel to the gravity direction. Then the operator performs the glue injection operation from the first direction Z. However, this process requires the use of glue blocking foam to block the glue to prevent the glue from flowing under the box 1, and finally the glue injection hole 6 must be blocked, which will increase the production cost and make the process complicated. Figure 7 and Figure 8 During the production process, the box 1 is Figure 1 The state in the dumped Figure 8 The state is such that the axis of the glue injection hole 6 is parallel to the direction of gravity, and then the operator injects glue into the accommodating cavity 11 through the glue injection hole 6, forming a channel 15 between the two tabs 42 spaced apart in the third direction Y, and the glue flows, diffuses, and covers along the channel 15, and finally forms a complete glue layer under the barrier effect of the insulating plate 8, effectively saving processing costs and improving processing convenience. The setting of the glue injection hole 6 on the narrow first side plate 1a1 can reduce the diffusion path of the glue in the third direction Y, so that the glue can be better formed.

[0064] It should be noted that, in this embodiment, the aluminum-plastic films between adjacent soft-packed battery cells 4 are connected by gluing to achieve fixation. In other optional embodiments, the soft-packed battery cells 4 may also be replaced by square batteries or the like.

[0065] On the other hand, the present application also discloses an electrical device, which includes: a battery pack as described above.

[0066] The above description is only a partial implementation method of the embodiments of the present application and does not constitute any form of limitation on the application. The protection scope of the embodiments of the present application is not limited thereto. Any simple modifications, equivalent changes and modifications that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the embodiments of the present application should be covered within the protection scope of the embodiments of the present application.

Claims

1. A battery pack having a first direction (Z), characterized in that: include: A box body (1) having a containing cavity (11); A cover body (2) is arranged on the box body (1) along the first direction (Z) to close the accommodating cavity (11); A circuit board assembly (3) and a soft-pack battery cell (4), wherein the cover body (2), the circuit board assembly (3) and the soft-pack battery cell (4) are arranged in sequence along the first direction (Z), and the circuit board assembly (3) and the soft-pack battery cell (4) are accommodated in the accommodation cavity (11); an isolating member (5) disposed in the accommodating chamber (11), the isolating member (5) dividing the accommodating chamber (11) into a first chamber (111) and a second chamber (112) arranged along the first direction (Z) and sealed from each other; The circuit board assembly (3) is located in the first chamber (111), the soft-pack battery cell (4) comprises a main body (41) and a pole ear (42) connected to each other, the main body (41) is located in the second chamber (112), and the pole ear (42) passes through the isolation member (5) and is connected to the circuit board assembly (3).

2. The battery pack according to claim 1, characterized in that: The inner surface of the box body (1) has an inner peripheral side surface (12) parallel to the first direction (Z), the outer peripheral side of the isolation member (5) is sealedly connected to the inner peripheral side surface (12), the isolation member (5) is provided with an avoidance hole (51) for the pole ear (42) to pass through, and the inner side surface of the avoidance hole (51) is sealedly connected to the pole ear (42).

3. The battery pack according to claim 2, characterized in that: A snap-fitting portion (121) is provided on the inner peripheral side surface (12), and the snap-fitting portion (121) forms a snap-fitting fit with the isolating member (5) in a direction perpendicular to the first direction (Z) for limiting the movement of the isolating member (5) along the first direction (Z).

4. The battery pack according to claim 1, wherein: The isolation member (5) is a glue layer formed by solidification of glue.

5. The battery pack according to claim 2 or 3, characterized in that: The box body (1) comprises a plurality of side panels (1a) parallel to the first direction (Z), the side panels (1a) being provided with glue injection holes (6) communicating with the accommodating cavity (11), and the isolation member (5) being arranged to block the glue injection holes (6).

6. The battery pack according to claim 5, having a second direction (X) and a third direction (Y), wherein the first direction (Z), the second direction (X) and the third direction (Y) intersect each other, and wherein: The side panel (1a) comprises a first side panel (1a1) facing each other in the second direction (X) and a second side panel (1a2) facing each other in the third direction (Y), the size of the second side panel (1a2) in the second direction (X) being larger than the size of the first side panel (1a1) in the third direction (Y), and the glue injection hole (6) is provided on the first side panel (1a1).

7. The battery pack according to claim 6, characterized in that: The soft-packed battery cells (4) are provided in plurality, and the plurality of soft-packed battery cells (4) are arranged in a close connection along the third direction (Y) to form a battery cell module (7). An insulating plate (8) is provided between the battery cell module (7) and the inner peripheral side surface (12). The insulating plate (8) is located on the side of the isolation member (5) facing away from the cover body (2). The insulating plate (8) is in contact with the inner peripheral side surface (12) on one side of the third direction (Y), and the insulating plate (8) is in contact with the outer side surface of the battery cell module (7) on the other side of the third direction (Y).

8. The battery pack according to claim 5, characterized in that: The box body (1) is also provided with a pressure relief member (9), the pressure relief member (9) is in communication with the second chamber (112), the pressure relief member (9) has a rupture limit pressure P1, the isolation member (5) has a rupture limit pressure P2, and P1 <P2。 9. The battery pack according to claim 8, characterized in that: The box body (1) comprises a bottom plate (1b) arranged facing the cover body (2) in the first direction (Z), a snap-in groove (1b1) is provided on a side of the bottom plate (1b) facing the cover body (2), the side plate (1a) is snap-fitted into the snap-in groove (1b1), and the pressure relief member (9) is the bottom plate (1b).

10. The battery pack according to claim 9, characterized in that: The side plate (1a) is clamped in the clamping groove (1b1), and the side plate (1a) and the clamping groove (1b1) are connected by gluing.

11. An electrical device, characterized in that: include: A battery pack as claimed in any one of claims 1 to 10.

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