Battery pack and electric equipment

Abstract

The invention discloses a battery pack and electric equipment. The battery pack comprises a first shell, a battery cell assembly, a first buffer piece, a first bonding piece, glue pouring resin and a first pressure relief part. The battery cell assembly is arranged in the first shell, the battery cell assembly comprises a plurality of battery cells, each battery cell comprises a battery cell shell, and the plurality of battery cells comprise a first battery cell and a second battery cell which are adjacently arranged; the first buffering piece comprises a first surface and a second surface which are oppositely arranged. The first buffer part is arranged between the first battery cell and the second battery cell; the first bonding piece is used for bonding the first surface and the battery core shell of the first battery core; the glue pouring resin is arranged in the first shell, the glue pouring resin is bonded with the battery cell assembly, the first buffer piece and the first shell, the glue pouring resin is bonded with the second surface and the battery cell shell of the second battery cell, and the peel strength between the first bonding piece and the battery cell shell of the first battery cell is larger than that between the glue pouring resin and the second surface. And the first pressure relief part is configured to discharge gas in the first shell, so that the condition that the battery pack is swelled is reduced.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery pack and electrical equipment. Background Art

[0002] The battery pack is usually sealed with potting glue. When using potting glue, it is easy for the potting glue to react with the foam to produce gas in a high temperature environment, or the battery cell to produce gas, causing the battery pack to swell and affect the use of the battery pack. Summary of the invention

[0003] In view of this, it is necessary to provide a battery pack and an electrical device to improve the problem of battery pack swelling.

[0004] An embodiment of the present application provides a battery pack, including a first shell, a battery cell assembly, a first buffer, a first adhesive, a potting resin and a first pressure relief portion. The battery cell assembly is arranged in the first shell, the battery cell assembly includes a plurality of battery cells, each battery cell includes a battery cell shell, and the plurality of battery cells include a first battery cell and a second battery cell arranged adjacently. The first buffer includes a first surface and a second surface arranged oppositely. The first buffer is arranged between the first battery cell and the second battery cell. The first adhesive adheres the first surface and the battery cell shell of the first battery cell. The potting resin is arranged in the first shell, the potting resin adheres the battery cell assembly, the first buffer and the first shell, the potting resin adheres the second surface and the battery cell shell of the second battery cell, and the peel strength between the first adhesive and the battery cell shell of the first battery cell is greater than the peel strength between the potting resin and the second surface. The first pressure relief portion is configured to discharge gas in the first shell. When the potting resin reacts with the first buffer component to generate gas, or the battery cell is depressurized to generate gas, the peel strength between the first adhesive and the battery cell shell of the first battery cell is greater than the peel strength between the potting resin and the second surface. The gas pushes apart the potting resin and the first buffer component to form an exhaust channel, and is discharged from the first pressure relief portion, thereby reducing swelling of the battery pack.

[0005] In one or more of the above optional embodiments, the plurality of battery cells are stacked along a first direction, and the first surface and the second surface are arranged opposite to each other along the first direction.

[0006] In one or more optional embodiments above, the battery pack includes an insulating member, and the insulating member includes a vertical portion extending out of the potting resin. The vertical portion includes two first regions and at least one second region arranged along the second direction, and the second region is located between the first regions along the second direction, so as to reduce the entry of the potting resin into the second region, facilitate exhaust, and reduce the risk of damage to the bottom wall of the shell when the gas opens the second region and the outermost battery shell. The battery pack includes a second adhesive member, and the second adhesive member is bonded to the first region and the outermost battery shell, and an exhaust channel is formed between the second region and the outermost battery shell.

[0007] In one or more optional embodiments above, the insulating member includes a horizontal portion, the horizontal portion is connected to the vertical portion. The battery cell housing includes a housing bottom wall, and a portion of the horizontal portion is in contact with and connected to the housing bottom wall, which facilitates gas to enter between the horizontal portion and the housing bottom wall from the exhaust channel, and forms an exhaust channel between the horizontal portion and the housing bottom wall.

[0008] In one or more optional embodiments above, the horizontal portion includes two third regions and at least one fourth region, and along the second direction, the fourth region is located between the third regions, which reduces the entry of the potting resin into the fourth region, is conducive to exhaust, and reduces the risk of damage to the bottom wall of the shell when the gas opens the horizontal portion and the bottom wall of the shell. The battery pack includes a third adhesive, and the third adhesive is bonded to each bottom wall of the shell and the third region, which is conducive to fixing the battery cell and the insulating member and forming an exhaust channel between the fourth region and the bottom wall of the shell.

[0009] In one or more optional embodiments above, the battery pack includes a second buffer member, and along the third direction, the second buffer member is located on the side of the horizontal portion away from the bottom wall of the shell, and the potting resin adheres the second buffer member, the first shell and the horizontal portion. The horizontal portion includes a first opening provided in the fourth area, and along the third direction, the first opening penetrates the horizontal portion, which is conducive to exhausting the gas generated by the reaction between the potting resin and the second buffer member. Along the third direction, the projection of the first opening is separated from the projection of the second buffer member, which reduces the shielding of the first opening by the second buffer member, which is conducive to exhaust.

[0010] In one or more of the above optional embodiments, the insulating member comprises a polycarbonate film.

[0011] In one or more optional embodiments above, the battery pack includes a circuit board, the battery cell includes an electrode terminal extending out of the battery cell housing, the circuit board and the battery cell housing are arranged along a third direction, the electrode terminal is connected to the circuit board, and along the third direction, the potting resin covers a side of the circuit board away from the battery cell housing.

[0012] In one or more optional embodiments above, the first pressure relief portion includes a breathable membrane and an exhaust port, the exhaust port penetrates the first shell, and the breathable membrane is connected to the first shell and covers the exhaust port.

[0013] An embodiment of the present application provides an electrical device, comprising the battery pack in any one of the above embodiments.

[0014] In the above-mentioned battery pack and electrical equipment, when the potting resin reacts with the first buffer component to generate gas, or the battery cell is depressurized to generate gas, the peel strength between the first adhesive and the battery cell shell of the first battery cell is greater than the peel strength between the potting resin and the second surface, and the gas pushes open the potting resin and the first buffer component to form an exhaust channel, and is discharged from the first pressure relief part, thereby reducing the swelling of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a battery pack in some embodiments of the present application is shown.

[0016] Figure 2 A schematic diagram of an exploded view of a battery pack in some embodiments of the present application is shown.

[0017] Figure 3 A schematic diagram of the structure of some battery packs in some embodiments of the present application is shown.

[0018] Figure 4 A schematic diagram of the structure of a portion of a battery pack from another perspective in some embodiments of the present application is shown.

[0019] Figure 5 A schematic diagram of the structure of some battery packs in some embodiments of the present application is shown.

[0020] Figure 6 A schematic diagram of the structure of some battery packs in some embodiments of the present application is shown.

[0021] Figure 7 A schematic diagram of the structure of the insulating member in some embodiments of the present application is shown.

[0022] Figure 8 Shows Figure 2 An enlarged schematic diagram of the middle portion of the first shell.

[0023] Fig. 9 A schematic diagram of the structure of electrical equipment in some embodiments of the present application is shown.

[0024] Description of main component symbols:

[0025] Battery Pack 100

[0026] First housing 10

[0027] Accommodation space 10a

[0028] Exhaust port 10b

[0029] Top wall 10c

[0030] Bottom wall 10d

[0031] First Shell 11

[0032] Second shell 12

[0033] first recess 13

[0034] second recess 14

[0035] First channel 14a

[0036] Air outlet 14b

[0037] First recessed area 141

[0038] Second recessed area 142

[0039] Battery cell assembly 20

[0040] Battery 21

[0041] Battery shell 211

[0042] Housing bottom wall 211a

[0043] Electrode terminal 212

[0044] The first buffer member 30

[0045] First surface 30a

[0046] Second surface 30b

[0047] First adhesive member 40

[0048] Glue filling resin 50

[0049] The first pressure relief portion 60

[0050] Breathable membrane 61

[0051] Shield 62

[0052] Insulation 70

[0053] Vertical portion 71

[0054] First Area 711

[0055] Second area 712

[0056] Extension 713

[0057] Horizontal portion 72

[0058] First opening 72a

[0059] The third area 721

[0060] Fourth Area 722

[0061] The second buffer member 80

[0062] Second housing 110

[0063] Second pressure relief portion 110a

[0064] Second adhesive member 102

[0065] The third adhesive member 103

[0066] Circuit board 105

[0067] Electrical equipment 200

[0068] First direction X

[0069] Second direction Y

[0070] The third direction Z

[0071] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0072] The technical solutions in the embodiments of the present application will be described below in conjunction with the 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 the embodiments.

[0073] When a component is considered to be “provided on” another component, it can be directly provided on the other component or there may be a component in between. When a component is considered to be “connected to” another component, it can be directly connected to the other component or there may be a component in between.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0075] It can be understood that the term "perpendicular" is used to describe an ideal state between two components. In actual production or use, there may be a state between the two components that is approximately perpendicular or equal. For example, in combination with numerical descriptions, perpendicularity may refer to the angle between two straight lines being in the range of 90°±10°, perpendicularity may also refer to the dihedral angle between two planes being in the range of 90°±10°, and perpendicularity may refer to the angle between a straight line and a plane being in the range of 90°±10°. The two components described as "perpendicular" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic perspective, a component can be considered a "straight line" or a "plane" if the overall extension direction is a straight line or a plane.

[0076] Unless otherwise defined, when the term "plurality" is used to describe the number of components, it specifically means that the components are two or more.

[0077] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0078] See also Figures 1 to 4 An embodiment of the present application provides a battery pack 100 , including a first shell 10 and a battery cell assembly 20 , wherein the battery cell assembly 20 is disposed in the first shell 10 .

[0079] In some embodiments, the battery cell assembly 20 includes a plurality of battery cells 21, and each battery cell 21 includes a battery cell housing 211. The plurality of battery cells 21 include a first battery cell 21a and a second battery cell 21b that are adjacently disposed.

[0080] In some embodiments, the battery pack 100 includes a first buffer 30 disposed between the first battery cell 21a and the second battery cell 21b, and includes a first surface 30a and a second surface 30b disposed opposite to each other. The first buffer 30 is configured to provide expansion space for the battery cell 21.

[0081] In some embodiments, the battery pack 100 includes a first adhesive member 40, and the first adhesive member 40 is bonded to the first surface 30a and the cell housing 211 of the first cell 21a. Optionally, the first adhesive member 40 includes a double-sided adhesive.

[0082] In some embodiments, the battery pack 100 includes a potting resin 50, which is disposed in the first shell 10. The potting resin 50 bonds the battery cell assembly 20, the first buffer 30, and the first shell 10. The potting resin bonds the second surface 30b and the battery shell 211 of the second battery cell 21b. The peel strength between the first adhesive 40 and the battery shell 211 of the first battery cell 21a is greater than the peel strength between the potting resin 50 and the second surface 30b.

[0083] In some embodiments, the battery pack 100 includes a first pressure relief portion 60 , and the first pressure relief portion 60 is configured to discharge gas in the first housing 10 .

[0084] When the potting resin 50 reacts with the first buffer member 30 to generate gas, or the battery cell 21 releases pressure to generate gas, the gas pushes apart the potting resin 50 and the first buffer member 30 to form an exhaust channel A, and is discharged from the first pressure relief portion 60 to reduce swelling of the battery pack 100.

[0085] In some embodiments, a first buffer 30 is disposed between every two adjacent battery cells 21 in the plurality of battery cells 21. In other embodiments, a first buffer 30 is disposed between some adjacent battery cells 21, and a first buffer 30 is not disposed between some adjacent battery cells 21.

[0086] In some embodiments, the first cushioning member 30 includes polypropylene foam.

[0087] In some embodiments, the potting resin 50 includes polyurethane potting resin.

[0088] In some embodiments, the plurality of battery cells 21 are stacked along the first direction X, and the first surface 30 a and the second surface 30 b are oppositely disposed along the first direction X.

[0089] See also Figure 2 In some embodiments, the first housing 10 includes a first housing 11 and a second housing 12 arranged along a second direction Y, the first housing 11 is connected to the second housing 12, and a receiving space 10a is formed. The battery cell assembly 20 is disposed in the receiving space 10a. The first direction X is perpendicular to the second direction Y.

[0090] See also Figure 2 and Figure 8 In some embodiments, the first pressure relief portion 60 includes a breathable membrane 61 and an exhaust port 10b, the breathable membrane 61 is connected to the first shell 10 and covers the exhaust port 10b, and the exhaust port 10b penetrates the first shell 10 along the third direction Z. The exhaust port 10b is connected to the accommodating space 10a. The gas is discharged to the external space of the first shell 10 through the exhaust port 10b and the breathable membrane 61. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. Optionally, the exhaust port 10b is provided in the first shell 11. Optionally, the exhaust port 10b is provided in the second shell 12.

[0091] In some embodiments, the first shell 10 includes a top wall 10 c and a bottom wall 10 d that are oppositely arranged along a third direction Z, and the first pressure relief portion 60 is arranged on the top wall 10 c . The third direction Z is perpendicular to the first direction X.

[0092] In some embodiments, the first housing 10 includes a first recess 13 , and the exhaust port 10 b penetrates the first recess 13 along the third direction Z. The air permeable membrane 61 is disposed in the first recess 13 .

[0093] In some embodiments, the first housing 10 includes a second recess 14 , and the first recess 13 is formed by a bottom depression of the second recess 14 .

[0094] In some embodiments, the first pressure relief portion 60 includes a shielding member 62 disposed in the second recess 14 , and the shielding member 62 covers the breathable membrane 61 along the third direction Z. A gap is provided between the shielding member 62 and the breathable membrane 61 , and the gap communicates with the external space of the first housing 10 .

[0095] In some embodiments, along the third direction Z, the second recess 14 includes a first recess area 141 , and the shielding member 62 covers the first recess area 141 and forms a first channel 14 a that communicates with the gap between the shielding member 62 and the gas permeable membrane 61 .

[0096] In some embodiments, along the third direction Z, the second recess 14 includes a second recess area 142 connected to the first recess area 141 , and along the third direction Z, the shielding member 62 is separated from the second recess area 142 and forms an air outlet 14b, which is connected to the external space of the first shell 10 .

[0097] When the gas generated by the reaction between the potting resin 50 and the first buffer member 30 is discharged, the gas enters the gap between the shielding member 62 and the breathable membrane 61 from the exhaust port 10b, passes through the breathable membrane 61, and is discharged from the outlet 14b to the external space of the first shell 10 through the first channel 14a.

[0098] In some embodiments, the potting resin is poured into the first housing 10 through the exhaust port 10 b , and after being cured, the potting resin bonds the battery cell assembly 20 , the first buffer 30 and the first housing 10 .

[0099] See also Figures 2 to 7 , Figure 7 1 is a schematic diagram of a partial structure of a battery pack 100, wherein A1 is an additional auxiliary line, and A1 represents the approximate height of the potting resin in the first housing 10. The battery pack 100 includes an insulating member 70, and the insulating member 70 includes a vertical portion 71, and the vertical portion 71 extends out of the potting resin 50 to facilitate exhaust.

[0100] In some embodiments, along the first direction X, the vertical portion 71 connects a side of the outermost battery cell casing 211 facing away from other battery cells 21 .

[0101] In some embodiments, the vertical portion 71 includes two first regions 711 and at least one second region 712 arranged along the second direction Y. Along the second direction Y, the second region 712 is located between the first regions 711, which reduces the entry of the potting resin 50 into the second region 712, is conducive to exhaust, and reduces the risk of damage to the bottom wall 211a of the shell when the gas opens the second region 712 and the outermost battery shell 211. In some embodiments, the battery pack 100 includes a second adhesive 102, and the second adhesive 102 adheres the first region 711 and the outermost battery shell 211, and an exhaust channel C is formed between the second region 712 and the outermost battery shell 211.

[0102] In some embodiments, the insulating member 70 includes two vertical portions 71 spaced apart along the first direction X, and the battery cell assembly 20 is located between the two vertical portions 71 along the first direction X. One of the vertical portions 71 is bonded to one of the outermost battery cell housings 211 through the second adhesive 102, and the other vertical portion 71 is bonded to the other outermost battery cell housing 211 through the second adhesive 102.

[0103] In some embodiments, the insulating member 70 includes a horizontal portion 72, and the horizontal portion 72 is connected to the vertical portion 71. The battery cell housing 211 includes a housing bottom wall 211a, and a portion of the horizontal portion 72 is in contact with and connected to the housing bottom wall 211a, which facilitates gas to enter between the horizontal portion 72 and the housing bottom wall 211a from the exhaust channel A, and an exhaust channel B is formed between the horizontal portion 72 and the housing bottom wall 211a.

[0104] In some embodiments, the horizontal portion 72 includes two third areas 721 and at least one fourth area 722. Along the second direction Y, the fourth area 722 is located between the third areas 721, thereby reducing the entry of the potting resin 50 into the fourth area 722, facilitating exhaust, and reducing the risk of damage to the bottom wall 211a of the shell when the gas opens the horizontal portion 72 and the bottom wall 211a of the shell.

[0105] In some embodiments, the battery pack 100 includes a third adhesive 103, which bonds each shell bottom wall 211a and two third regions 721, which is beneficial to fix the battery cell 21 and the insulating member 70 and form an exhaust channel B between the fourth region 722 and the shell bottom wall 211a.

[0106] In some embodiments, the horizontal portion 72 includes a first opening 72 a disposed in the fourth region 722 . Along the third direction Z, the first opening 72 a penetrates the horizontal portion 72 .

[0107] In some embodiments, the battery pack 100 includes a second buffer member 80, and along the third direction Z, the second buffer member 80 is located on the side of the horizontal portion 72 away from the bottom wall 211a of the shell, and the potting resin 50 bonds the second buffer member 80, the first shell 10 and the horizontal portion 72. The gas generated by the reaction between the potting resin 50 and the second buffer member 80 enters the exhaust channel B through the first opening 72a, and enters the exhaust channel C from the exhaust channel B, which is conducive to exhaust.

[0108] In some embodiments, along the third direction Z, the projection of the first opening 72 a is separated from the projection of the second buffer member 80 , so as to reduce the shielding of the first opening 72 a by the second buffer member 80 , which is beneficial to exhaust.

[0109] In some embodiments, along the third direction Z, the projection of the second buffer member 80 is separated from the projection of the fourth area 722 , which further reduces the shielding of the first opening 72 a by the second buffer member 80 , and is beneficial to exhaust.

[0110] In some embodiments, the second cushioning member 80 includes polypropylene foam.

[0111] In some embodiments, the insulating member 70 includes a polycarbonate film.

[0112] In some embodiments, the battery cell 21 includes an electrode terminal 212 and an electrode assembly (not shown). The electrode assembly is disposed in the battery cell housing 211 . The electrode terminal 212 is connected to the electrode assembly and extends out of the battery cell housing 211 .

[0113] In some embodiments, the battery pack 100 includes a circuit board 105 , the circuit board 105 and the battery cell housing 211 are arranged along a third direction Z, and the electrode terminal 212 is connected to the circuit board 105 .

[0114] In some embodiments, along the third direction Z, the potting resin 50 covers a side of the circuit board 105 facing away from the battery cell housing 211 .

[0115] In some embodiments, the vertical portion 71 includes an extension portion 713, and the extension portion 713 protrudes from the circuit board 105. Along the third direction Z, the extension portion 713 is bent toward a side of the circuit board 105 away from the battery cell housing 212 to facilitate assembly.

[0116] Optionally, the circuit board 105 includes a BMS component (Battery Management System), which includes multiple electronic components. The multiple electronic components can realize functions such as control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell 21.

[0117] Optionally, the circuit board 105 includes a flexible printed circuit (FPC). Optionally, the circuit board 105 includes a printed circuit board (PCB).

[0118] See also Figure 1 and Figure 2 In some embodiments, the battery pack 100 includes a second shell 110 , the first shell 10 is located in the second shell 110 , and the second shell 110 is provided with a second pressure relief portion 110 a .

[0119] When the battery pack 100 is venting, when the potting resin 50 reacts with the first buffer member 30 to generate gas, or when the battery cell 21 is depressurized to generate gas, the gas pushes open the potting resin 50 and the second surface 30b to form an exhaust channel A, and the gas enters the exhaust channel B formed between the horizontal portion 72 and the bottom wall 211a of the shell from the exhaust channel A, and the gas enters the exhaust channel C formed between the vertical portion 71 and the outermost battery cell shell 211 from the exhaust channel B, and the gas enters the exhaust port 10b from the exhaust channel C, passes through the breathable membrane 61 into the gap between the shielding member 62 and the breathable membrane 61, and is discharged to the external space of the battery pack 100 through the first channel 14a, the air outlet 14b and the second pressure relief portion 110a.

[0120] When the potting resin 50 reacts with the second buffer member 80 to generate gas, the gas enters between the horizontal portion 72 and the bottom wall 211a of the shell through the first opening 72a, and forms an exhaust channel B. The gas enters the exhaust channel C formed between the vertical portion 71 and the outermost battery cell shell 211 from the exhaust channel B. The gas enters the exhaust port 10b from the exhaust channel C, passes through the breathable membrane 61, enters the gap between the shielding member 62 and the breathable membrane 61, and is discharged to the external space of the battery pack 100 through the first channel 14a, the air outlet 14b and the second pressure relief portion 110a.

[0121] See also Fig. 9 The present application provides an electric device 200 using the above-mentioned battery pack 100. In one embodiment, the electric device 200 of the present application may be, but is not limited to, a drone, a backup power supply, an electric car, an electric motorcycle, an electric power-assisted bicycle, an electric tool, a large household battery, and the like.

[0122] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application, and are not used as limitations on the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A battery pack, characterized in that: include: a first shell; A battery cell assembly is disposed in the first shell, the battery cell assembly includes a plurality of battery cells, each of the battery cells includes a battery cell shell, and the plurality of battery cells include a first battery cell and a second battery cell that are adjacently disposed; A first buffer member, comprising a first surface and a second surface arranged opposite to each other, wherein the first buffer member is arranged between the first battery cell and the second battery cell; a first adhesive member, bonding the first surface and a cell shell of the first cell; A potting resin is disposed in the first shell, the potting resin is bonded to the battery cell assembly, the first buffer and the first shell, the potting resin is bonded to the second surface and the battery cell shell of the second battery cell, and the peel strength between the first adhesive and the battery cell shell of the first battery cell is greater than the peel strength between the potting resin and the second surface; The first pressure relief portion is configured to discharge the gas in the first shell.

2. The battery pack according to claim 1, wherein: The plurality of battery cells are stacked along a first direction, and the first surface and the second surface are arranged opposite to each other along the first direction.

3. The battery pack according to claim 1 or 2, characterized in that: The battery pack includes an insulating member, wherein the insulating member includes a vertical portion extending out of the potting resin, The vertical portion includes two first regions and at least one second region arranged along a second direction, and the second region is located between the first regions along the second direction; The battery pack includes a second adhesive member, the second adhesive member is bonded to the first region and the outermost battery cell shell, and an exhaust channel is formed between the second region and the outermost battery cell shell.

4. The battery pack according to claim 3, characterized in that: The insulating member includes a horizontal portion, the horizontal portion connecting the vertical portion; The battery cell case includes a case bottom wall, and a portion of the horizontal portion is in contact with and connected to the case bottom wall.

5. The battery pack according to claim 4, characterized in that: The horizontal portion includes two third areas and at least one fourth area, and along the second direction, the fourth area is located between the third areas; The battery pack includes a third adhesive member that bonds each of the housing bottom walls and the third region.

6. The battery pack according to claim 5, characterized in that: The battery pack includes a second buffer member, and along the third direction, the second buffer member is located on a side of the horizontal portion away from the bottom wall of the shell, and the potting resin bonds the second buffer member, the first shell and the horizontal portion; The horizontal portion includes a first opening provided in the fourth region, and the first opening penetrates the horizontal portion along the third direction; Along the third direction, a projection of the first opening is separated from a projection of the second buffer member.

7. The battery pack according to any one of claims 3 to 6, characterized in that: The insulating member includes a polycarbonate film.

8. The battery pack according to any one of claims 3 to 7, characterized in that: The battery pack includes a circuit board, the battery cell includes an electrode terminal extending out of the battery cell housing, the circuit board and the battery cell housing are arranged along a third direction, and the electrode terminal is connected to the circuit board; Along the third direction, the potting resin covers a side of the circuit board facing away from the battery cell housing.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The first pressure relief portion includes a breathable membrane and an exhaust port, the exhaust port passes through the first shell, and the breathable membrane is connected to the first shell and covers the exhaust port.

10. An electrical device, characterized in that: A battery pack comprising the battery pack as claimed in any one of claims 1 to 9.

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