Battery packs and electrical equipment

Abstract

The embodiments of the present application relate to the field of battery technology, and in particular to a battery pack and an electrical device, wherein the battery pack includes a shell and a plurality of battery cells, the shell is provided with a cavity, the plurality of battery cells are accommodated in the cavity, and the shell is also provided with a plurality of through holes penetrating the shell; the battery cell includes a packaging bag, an electrode assembly and a pole ear, the packaging bag includes a main body, a top seal and a side seal, the electrode assembly is accommodated in the main body, one end of the pole ear is connected to the electrode assembly, the other end of the pole ear extends from the top seal and extends to the outside of the packaging bag, the side seal is connected to the main body, and the side seal of the battery cell is plugged into the through hole. Through the above-mentioned battery pack, the heat generated by the battery cell can be dissipated to the outside of the battery pack through the through hole. When a battery cell is overheated and bursts at the side seal, the overheated gas can be dissipated from the side seal and the through hole to the outside of the battery pack to prevent the heat generated by the battery cell from accumulating inside the battery pack.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] A battery pack is a device that converts external energy into electrical energy and stores it inside to power external devices (such as portable electronic devices) when needed. Generally, a battery pack includes multiple cells and a shell, and multiple cells are housed in the shell. The cell includes an electrode assembly, a tab and a packaging bag. The electrode assembly includes a positive electrode sheet and a negative electrode sheet that are arranged alternately in a cycle, and a separator disposed between the two and used to separate the two. The electrode assembly is housed in a packaging bag, and the packaging bag has a side seal. One end of the tab is connected to the electrode assembly, and the other end of the tab extends from the packaging bag. Among them, the cell is the main heat source and thermal runaway component inside the battery pack, and the heat generated by the cell can easily cause the cell to overheat. In the prior art, in order to alleviate the damage to the battery pack caused by the heat generated by the cell, two methods are usually used. One is to use a cathode, an anode, an electrolyte and a diaphragm material with high thermal stability to prepare the electrode assembly in the cell. The other is to quickly balance the heat of the cell to other components in the battery pack through metal or a heat-conductive colloid.

[0003] In the process of realizing the present application, the inventor of the present application found that: at present, in the prior art, the heat generated by the battery cells in the battery pack is still inside the battery pack, which easily causes the heat to accumulate inside the battery pack, and then will cause the battery pack to catch fire or even explode. Summary of the invention

[0004] In view of the above problems, an embodiment of the present application provides a battery pack and an electrical device, in which the heat generated by the battery cells in the battery pack is dissipated to the outside of the battery pack to avoid heat accumulation inside the battery pack.

[0005] According to one aspect of the embodiment of the present application, a battery pack is provided, comprising a shell and a plurality of battery cells, wherein the shell is provided with a cavity, wherein the plurality of battery cells are accommodated in the cavity, and wherein the plurality of battery cells are stacked along a first direction, and wherein the shell is further provided with a plurality of through holes penetrating the shell; wherein the battery cell comprises a packaging bag, an electrode assembly and a pole ear, wherein the packaging bag comprises a main body, a top seal and a side seal, wherein the electrode assembly is accommodated in the main body, wherein one end of the pole ear is connected to the electrode assembly, and the other end of the pole ear extends from the top seal and extends to the outside of the packaging bag, and wherein the side seal of the battery cell is plugged into the through hole. On the one hand, the heat generated by the battery cells in the battery pack can be dissipated to the outside of the battery pack through the through hole, and on the other hand, when a certain battery cell is overheated and ruptures at a weak side seal, the overheated gas can be dissipated to the outside of the battery pack from the side seal and the through hole, thereby preventing the heat generated by the battery cells from accumulating inside the battery pack and further preventing the battery pack from catching fire or even exploding. In addition, the side sealing edge of the battery cell is inserted into the through hole, so that the battery cell and the shell can be fixed to avoid damage to the battery cell caused by collision between the battery cell and the shell or between the battery cells.

[0006] In an optional manner, the side seal of the battery cell extends from the through hole to the outside of the shell. When a battery cell is overheated and ruptures at a weak side seal, the overheated gas can be directly dissipated from the side seal to the outside of the battery pack, so that the heat generated by the battery cell can be quickly dissipated to the outside of the battery pack.

[0007] In an optional manner, the battery pack further includes a first adhesive resin, which is filled between the side seal and the inner surface of the through hole, and is used to bond and fix the side seal and the inner surface of the through hole. By providing the first adhesive resin, the battery cell and the shell can be firmly fixed, further avoiding collisions between the battery cell and the shell and between the battery cells to cause damage to the battery cell.

[0008] In an optional manner, the shape of the inner surface of the through hole adapts to the shape of the outer surface of the side seal of the battery cell, thereby strengthening the fixation of the battery cell to the shell and further avoiding damage to the battery cell caused by collision between the battery cell and the shell and between the battery cells.

[0009] In an optional manner, the inner wall of the shell is provided with a plurality of fixing grooves, a through hole is located at the bottom of a fixing groove, and the main body of a battery cell is partially accommodated in a fixing groove, so that the fixation between the battery cell and the shell can be strengthened through the fixing groove and the through hole.

[0010] In an optional manner, the battery pack further includes a second adhesive resin, which is filled between the inner surface of the fixing groove and the main body of the battery cell, and is used to bond the main body of the battery cell to the inner surface of the fixing groove. By providing the second adhesive resin, the battery cell and the shell can be further firmly fixed, thereby avoiding collisions between the battery cell and the shell and between the battery cells, thereby preventing the battery cell from being damaged.

[0011] In an optional manner, the width of the side seal along the first direction is smaller than the width of the corresponding through hole along the first direction; the length of the side seal along the second direction is smaller than the length of the corresponding through hole along the second direction, wherein the second direction is perpendicular to the first direction, and the second direction is perpendicular to the top seal of the battery cell. That is, there is a certain gap between the side seal of the battery cell and the through hole, which, on the one hand, facilitates the insertion of the side seal of the battery cell into the through hole, and on the other hand, avoids damage to the side seal when the side seal is inserted into the through hole.

[0012] In an optional manner, the width of the through hole along the first direction ranges from 0.1 mm to 2 mm, thereby being able to meet the size requirements of the side sealing edges of most battery cells.

[0013] In an optional manner, the battery pack further includes a heat conductor, which is disposed between the main body of the battery cell and the shell, and the heat conductor is in contact with the main body of the battery cell and the shell, respectively. By providing the heat conductor, the heat generated by the battery cell is balanced and then dissipated to the outside of the battery pack, thereby extending the service life of the battery pack as a whole.

[0014] According to one aspect of an embodiment of the present application, there is provided an electrical device including the above-mentioned battery pack and a load, wherein the battery pack is used to supply power to the load, and the electrical device including the above-mentioned battery pack and the load has a long service life.

[0015] In an optional manner, the electrical equipment is at least one of an energy storage device, an electric vehicle, a drone, and an electric tool.

[0016] The beneficial effects of the embodiments of the present application are as follows: a battery pack and an electrical device are provided, the battery pack includes a shell and a plurality of cells, the cells include a packaging bag, an electrode assembly and a pole ear, the packaging bag includes a main body, a top seal and a side seal, the electrode assembly is accommodated in the main body, one end of the pole ear is connected to the electrode assembly, and the other end of the pole ear extends from the top seal of the main body and extends to the outside of the packaging bag. By arranging a plurality of through holes in the shell, and the side seals of the cells are plugged into the through holes, the heat generated by the cells can be dissipated to the outside of the battery pack through the through holes on the one hand, and on the other hand, when a cell is overheated and ruptures at a weak side seal, the overheated gas can be dissipated from the side seal and the through hole to the outside of the battery pack, thereby avoiding the heat generated by the cells from accumulating inside the battery pack and further avoiding the battery pack from catching fire or even exploding. In addition, the side seal of the cell is plugged into the through hole, so that the cell and the shell can be fixed, avoiding the cell from being damaged by collisions between the cell and the shell and between the cell and the cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0018] Figure 1 is a schematic diagram of a battery pack provided in an embodiment of the present application;

[0019] Figure 2 is an exploded schematic diagram of a battery pack provided in an embodiment of the present application;

[0020] Figure 3 is a schematic diagram of a battery cell provided in an embodiment of the present application;

[0021] Figure 4 is another schematic diagram of a battery cell provided in an embodiment of the present application;

[0022] Figure 5 is a cross-sectional view of a housing provided in an embodiment of the present application;

[0023] Figure 6 is another schematic diagram of a battery cell provided in an embodiment of the present application;

[0024] Figure 7 The embodiment of this application provides Figure 6 Enlarged view of middle part B;

[0025] Figure 8 The embodiment of this application provides Figure 1 Enlarged view of part A in the middle. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right", "inside", "outside" and similar expressions used in this specification are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used 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 "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0028] See also Figure 1 and Figure 2 The battery pack includes: a housing 10 and a plurality of battery cells 20 , wherein the plurality of battery cells 20 are received in the housing 10 and are stacked along a first direction D1 .

[0029] For the above-mentioned multiple battery cells 20, please refer to Figure 3 The battery cell 20 includes a packaging bag 21, an electrode assembly (not shown) and a tab 22. The packaging bag 21 includes a main body 211, a top seal 212 and a side seal 213. The top seal 212 and the side seal 213 are both connected to the main body. The electrode assembly is accommodated in the main body 211, one end of the tab 22 is connected to the electrode assembly, and the other end of the tab 22 extends from the top seal 212 of the main body 211 and extends to the outside of the packaging bag 21.

[0030] For the top edge seal 212 and the side edge seal 213, in some embodiments, please refer to Figure 4 The top sealing edge 212 is connected to the middle of the main body 211 in the first direction D1, and the side sealing edge 213 is connected to the middle of the main body in the first direction D1. Then, it is convenient to insert the side sealing edge 213 into the through hole 12.

[0031] For the housing 10, see Figure 2 and Figure 5 The housing 10 is provided with a cavity 11 , a plurality of through holes 12 communicating with the cavity 11 , and a plurality of fixing grooves 13 .

[0032] Regarding the above-mentioned through hole 12, the shape of the through hole 12 can be various, such as circular, elliptical or groove-shaped, and the present application does not make any specific limitation.

[0033] A plurality of battery cells 20 are accommodated in the cavity 11 .

[0034] The side seal 213 of the battery cell 20 is inserted into the through hole 12. By providing the through hole 12 in the shell 10, on the one hand, the side seal 213 of the battery cell 20 and the shell 10 can be easily fixed, thereby realizing the fixation of the battery cell 20 and the shell 10, so that when the battery pack is vibrated, the battery cell 20 and the shell 10, and the battery cells 20 and the battery cells 20 can be prevented from being damaged due to collision; on the other hand, the heat generated by the battery cell 20 can be dissipated from the through hole 12 to the outside of the battery pack, so that the battery cell 20 is not easy to overheat; on the other hand, when the battery cell 20 is overheated, the overheated battery cell 20 will generate a large amount of overheated gas, causing the packaging bag 2 of the battery cell 20 to be damaged. 1 bursts, since the side sealing edge 213 of the battery cell 20 is the weak area of ​​the battery cell 20, when the packaging bag 21 bursts, the side sealing edge 213 is burst first, and the overheated gas is released from the side sealing edge 213 and the through hole 12 to the outside of the battery pack, and other battery cells 20 in the battery pack will not be cascaded overheated due to the overheated gas generated by the overheated battery cell 20, which can avoid greater danger; on the other hand, when a battery cell 20 bursts due to overheating, when maintaining the battery pack, only the battery cell 20 that has burst due to overheating needs to be replaced, so the maintenance cost of the battery pack is low.

[0035] In some embodiments, see Figure 6 , Figure 7 and Figure 8 , the width b' of the side sealing edge 213 along the first direction D1 is less than the width b of the corresponding through hole 12 along the first direction D1. The first direction D1 is the direction in which the multiple battery cells 20 are stacked. The length a' of the side sealing edge 213 along the second direction D2 is less than the length a of the corresponding through hole 12 along the second direction D2, wherein the second direction D2 is perpendicular to the first direction D1, and the second direction D2 is perpendicular to the top sealing edge 212 of the main body 211 of the battery cell 20.

[0036] Since the sizes of the side seals 213 of different battery cells 20 are different, there is no specific limitation on the size of the through hole 12. The size of the through hole 12 is selected according to the size of the side seals 213 of the battery cell 20 accommodated in the shell 10, as long as the width b' of the side seal 213 along the first direction D1 is smaller than the width b of the corresponding through hole 12 along the first direction D1 and the length a' of the side seal 213 along the second direction D2 is smaller than the length a of the corresponding through hole 12 along the second direction D2.

[0037] Generally, the width b' of the side sealing edge 213 of the battery cell 20 along the first direction D1 ranges from 0.1 mm to 2 mm, and the width b of the through hole 12 along the first direction D1 ranges from 0.1 mm to 2 mm, and the width b' of the side sealing edge 213 of the battery cell 20 along the first direction D1 is smaller than the width b of the corresponding through hole 12 along the first direction D1.

[0038] In some embodiments, the side seal 213 of a battery cell 20 is inserted into a through hole 12 and extends from the through hole 12 to the outside of the housing 10, that is, the width c' of the side seal 213 of the battery cell 20 from the main body 211 of the battery cell 20 to the end of the side seal 213 away from the main body 211 (see Figure 7 ) is greater than the depth of the through hole 12, wherein the depth of the through hole 12 is the thickness of the shell 10 at the through hole 12, then after the side seal 213 ruptures, on the one hand, the overheated gas can be discharged to the outside of the battery pack as much as possible, and on the other hand, after the side seal 213 ruptures, if the electrolyte in the overheated battery cell 20 overflows, the overflowed electrolyte can overflow to the outside of the battery pack, and is not easy to flow into the battery pack along the inner surface of the through hole 12, thereby corroding other components in the battery pack, causing the battery pack to short-circuit and catch fire.

[0039] In some embodiments, in order to strengthen the fixation of the side seal 213 of the battery cell 20 and the shell 10, and to avoid damage to the battery cell 20 due to collision between the battery cell 20 and the shell 10, and between the battery cells 20 when the battery pack vibrates, the inner surface of the through hole 12 can be designed to be contoured, that is, the shape of the inner surface of the through hole 12 is the same as the outer surface of the side seal 213 of the battery cell 20 and the shape of a part of the main body 211 of the battery cell 20 corresponding to the through hole 12.

[0040] In some embodiments, in order to strengthen the fixation between the side seal 213 of the battery cell 20 and the shell 10 and to avoid damage to the battery cell 20 due to collision between the battery cell 20 and the shell 10 when the battery pack vibrates, a first adhesive resin (not shown) may be filled between the side seal 213 of the battery cell 20 and the inner surface of the through hole 12 so that the side seal 213 of the battery cell 20 and the inner surface of the through hole 12 are bonded and fixed by the first adhesive resin.

[0041] In some embodiments, in order to strengthen the fixation of the side seal 213 of the battery cell 20 and the shell 10, and to avoid damage to the battery cell 20 due to collision between the battery cell 20 and the shell 10 when the battery pack vibrates, the inner surface of the through hole 12 can be designed to be contoured, that is, the shape of the inner surface of the through hole 12 is the same as the outer surface of the side seal 213 of the battery cell 20 and the shape of a part of the main body 211 of the battery cell 20 corresponding to the through hole 12, and a first bonding resin (not shown) can be filled between the side seal 213 of the battery cell 20 and the inner surface of the through hole 12, so that the side seal 213 of the battery cell 20 and the inner surface of the through hole 12 are bonded and fixed by the first bonding resin.

[0042] Please note that Figure 2When the battery cell 20 includes two opposite side seals 213, the number of through holes 12 provided on the shell 10 is twice that of the battery cells 20, and the through holes 12 are distributed on two opposite sides of the shell 10. Then, the multiple battery cells 20 in the battery pack are stacked, and one side seal 213 of a battery cell 20 is plugged into a through hole 12 on one side of the shell 10, and the other side seal 213 of a battery cell 20 is plugged into another through hole 12 on the other side of the shell 10.

[0043] See also Figure 5 , a fixing groove 13 is provided on the inner wall of the shell 10, and the fixing groove 13 is connected with the cavity 11. That is, the fixing groove 13 is formed by the shell 10 being recessed from its inner wall toward the outer wall of the shell 10. A through hole 12 is located at the bottom of a fixing groove 13. A main body 211 of a battery cell 20 is partially accommodated in a fixing groove 13. When the main body 211 of the battery cell 20 is partially accommodated in the fixing groove 13, the side sealing edge 213 of the battery cell 20 is plugged into the through hole 12 located at the bottom of the fixing groove 13, and the battery cell 20 can be fixed to the shell 10 through the fixing groove 13 and the through hole 12.

[0044] In some embodiments, the inner wall of the fixing groove 13 can be designed to be contoured, that is, the shape of the inner wall of the fixing groove 13 is the same as the shape of the portion of the main body 211 of the battery cell 20 accommodated in the fixing groove 13, that is, the portion of the main body 211 of the battery cell 20 accommodated in the fixing groove 13 fits the inner wall of the fixing groove 13, thereby fixing the battery cell 20 and the shell 10, and further avoiding damage to the battery cell 20 due to collision between multiple battery cells 20 and the inner wall of the shell 10 or between battery cells 20 when the battery pack vibrates, thereby extending the life of the battery pack.

[0045] In some embodiments, in order to strengthen the fixation between the main body 211 of the battery cell 20 and the shell 10 and to avoid damage to the battery cell 20 due to collision between the battery cell 20 and the shell 10 when the battery pack vibrates, a second adhesive resin (not shown) may be filled between the main body 211 of the battery cell 20 and the inner wall of the fixing groove 13 so that the main body 211 of the battery cell 20 and the inner wall of the fixing groove 13 are bonded and fixed by the second adhesive resin.

[0046] It is understandable that while the second adhesive resin is filled between the main body 211 of the battery cell 20 and the inner wall of the fixing groove 13 , the first adhesive resin may also be filled between the side sealing edge 213 of the battery cell 20 and the inner surface of the through hole 12 .

[0047] It should be noted that in order to solve the problem in the prior art that the heat generated by the battery cell 20 in the battery pack still has an adverse effect on the battery pack in the battery pack, the fixing groove 13 may not be provided, but only a through hole 12 may be provided, and the side sealing edge 213 of the battery cell 20 may be inserted into the through hole 12 to dissipate the heat generated by the battery cell 20 to the outside of the battery pack through the through hole 12.

[0048] In some embodiments, in order to alleviate the damage to the battery pack caused by the heat generated by the battery cell 20, please refer to Figure 2 , a heat conductor 30 may be provided between the main body 211 of the battery cell 20 and the shell 10, and the heat conductor 30 is in contact with the main body 211 of the battery cell 20 and the shell 10 respectively, so that the heat generated by the battery cell 20 is conducted to the shell 10 through the heat conductor 30 on the one hand, and further dissipated to the outside of the battery pack, and on the other hand, the heat is balanced inside the battery pack, and then dissipated to the outside of the battery pack from the through hole 12, so that the heat accumulation at a certain battery cell 20 can be avoided, which may cause damage to the battery cell 20 at that location, and further quickly cause damage to the battery pack. That is, by providing the heat conductor 30 and the through hole 12, the heat generated by the battery cell 20 is balanced and then dissipated to the outside of the battery pack, so that the overall service life of the battery pack is long.

[0049] In some embodiments, the heat conducting member 30 may be thermally conductive silicone grease or thermally conductive metal.

[0050] It can be understood that in some embodiments, the thermal conductor 30 wraps the battery cell 20, thereby enhancing the conduction of heat generated by the battery cell 20 to the shell 10 and dissipation to the outside of the battery pack through the thermal conductor 30, and enhancing the balance of heat generated by the battery cell 20 inside the battery pack.

[0051] In order to facilitate the reader to understand the inventive concept of the embodiment of the present application, five specific battery packs are listed below, namely, battery pack 1, battery pack 2, battery pack 3, battery pack 4 and battery pack 5 for reference. The five battery packs listed have the same structure: the battery pack includes a shell and 16 cells, the 16 cells are stacked in the shell along the first direction, and the shell and the side seal of each cell are provided with through holes at positions corresponding to the side seal of each cell, and the side seal of the cell is plugged into the through hole; the width of the through hole is the size of the through hole in the first direction, the length of the through hole is the size of the through hole in the second direction, the second direction is a direction perpendicular to the first direction and the top seal of the cell, and the depth of the through hole is the thickness of the shell at the through hole; the thickness of the side seal of the cell is the width of the side seal along the first direction, the length of the side seal of the cell is the size of the side seal in the second direction, and the width of the side seal of the cell is the size from the main body of the cell to the end of the side seal away from the main body. The differences between battery pack 1, battery pack 2, battery pack 3, battery pack 4 and battery pack 5 are as follows.

[0052] Battery Pack 1: The width of the through hole is 1 mm, the length of the through hole is 102 mm, the depth of the through hole is 2 mm, the thickness of the side seal is 0.3 mm, the length of the side seal is 100 mm, and the width of the side seal is 2 mm.

[0053] Battery pack 2: The difference between battery pack 2 and battery pack 1 is that the side seals of the battery cells and the inner surface of the through hole are bonded by a first bonding resin.

[0054] Battery pack 3: The difference between battery pack 3 and battery pack 1 is that the inner surface of the through hole is contoured.

[0055] Battery pack 4: The difference between battery pack 4 and battery pack 1 is that the width of the through hole is 0.5 mm, the width of the side seal is 3 mm, a fixing groove is provided on the inner wall of the shell, and the inner wall of the fixing groove is contoured, the main body of the battery cell is partially accommodated in the fixing groove, and the main body of the battery cell and the inner wall of the fixing groove are bonded by a second adhesive resin.

[0056] Battery pack 5: The difference between battery pack 5 and battery pack 1 is that the width of the through hole is 0.5 mm, the width of the side seal is 1.5 mm, the inner surface of the through hole is contoured, a fixing groove is provided on the inner wall of the shell, and the inner wall of the fixing groove is contoured, the main body of the battery cell is partially accommodated in the fixing groove, the side seal of the battery cell and the inner surface of the through hole are bonded by a first adhesive resin, and the main body of the battery cell and the inner wall of the fixing groove are bonded by a second adhesive resin.

[0057] The above five specific battery packs, battery pack 1, battery pack 2, battery pack 3, battery pack 4 and battery pack 5, can all achieve the heat generated in the battery cells to be dissipated to the outside of the battery pack, and can all achieve the fixation of the battery cells and the shell. Among them, the heat generated by the battery cells in battery pack 1 and battery pack 3 can be dissipated to the outside of the battery pack through the through holes. When a battery cell is overheated and ruptures at the side seal, the overheated gas can be dissipated to the outside of the battery pack from the side seal and the through holes. Among them, the inner surface of the through hole of the shell of battery pack 3 is contoured, the inner wall of the fixing groove set on the shell of battery pack 4 is contoured, the inner surface of the through hole of battery pack 5 is contoured and the inner wall of the fixing groove is contoured, then battery pack 3, battery pack 4 and battery pack 5 can all achieve strong fixation of the battery cells and the shell. Among them, the side seals of the battery cells and the inner surfaces of the through holes in battery pack 2 are bonded by the first adhesive resin, the main body of the battery cells and the inner walls of the fixing grooves in battery pack 4 are bonded by the second adhesive resin, and the side seals of the battery cells and the inner surfaces of the through holes in battery pack 5 are bonded by the first adhesive resin and the main body of the battery cells and the inner walls of the fixing grooves are bonded by the second adhesive resin. Battery packs 2, 4 and 5 can also achieve strong fixation of the battery cells and the shells.

[0058] In the embodiment of the present application, the battery pack includes a shell 10 and a plurality of battery cells 20. By providing a plurality of through holes 12 in the shell 10 and inserting the side seal 213 of a battery cell 20 into a through hole 12, the heat generated by the battery cell 20 can be dissipated to the outside of the battery pack through the through hole 12. On the other hand, when a battery cell 20 is overheated and bursts at the weak side seal 213, the overheated gas can be dissipated from the side seal 213 and the through hole 12 to the outside of the battery pack, thereby preventing the heat generated by the battery cell 20 from accumulating inside the battery pack and further preventing the battery pack from catching fire or even exploding. In addition, the side seal 213 of the battery cell 20 is inserted into the through hole 12, so that the battery cell 20 can be fixed to the shell 10, avoiding the battery cell 20 from being damaged due to collisions between the battery cell 20 and the shell 10 and between the battery cell 20 and the battery cell 20.

[0059] The present application also provides an embodiment of an electric device, the electric device includes the above-mentioned battery pack and a load, and the battery pack is used to supply power to the load. The specific structure and function of the battery pack can be referred to the above-mentioned embodiment, which will not be described one by one here.

[0060] The electrical equipment may be at least one of an energy storage device, an electric vehicle, a drone, and an electric tool, or the electrical equipment may also be a mobile phone, a tablet, a unicycle or an electric vehicle with more than two wheels, etc.

[0061] For example, for the above-mentioned drone, the battery pack is mounted on the drone, and the battery pack is used to power loads on the drone including a flight system, a control system, and a camera system.

[0062] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not used as additional limitations on the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the present application; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present application.

Claims

1. A battery pack, comprising a shell and a plurality of battery cells, wherein the shell is provided with a cavity, the plurality of battery cells are accommodated in the cavity, and the plurality of battery cells are stacked along a first direction, characterized in that: The shell is further provided with a plurality of through holes penetrating the shell, and the through holes are exposed on the outside of the battery pack; The battery cell comprises a packaging bag, an electrode assembly and a tab; The packaging bag comprises a main body, a top seal and a side seal, the electrode assembly is accommodated in the main body, one end of the pole ear is connected to the electrode assembly, the other end of the pole ear extends from the top seal and extends outside the packaging bag, and the side seal of the battery cell is plugged into the through hole; The battery pack further includes a first bonding resin, which is filled between the side sealing edge and the inner surface of the through hole, and is used to bond and fix the side sealing edge and the inner surface of the through hole.

2. The battery pack according to claim 1, characterized in that: The side sealing edge of the battery core extends from the through hole to the outside of the shell.

3. The battery pack according to claim 1, characterized in that: The shape of the inner surface of the through hole adapts to the shape of the outer surface of the side sealing edge of the battery core.

4. The battery pack according to claim 3, characterized in that: The inner wall of the shell is provided with a plurality of fixing grooves, one of the through holes is located at the bottom of one of the fixing grooves, and the main body of one of the battery cells is partially accommodated in one of the fixing grooves.

5. The battery pack according to claim 4, characterized in that: It also includes a second adhesive resin, which is filled between the inner surface of the fixing groove and the main body of the battery cell, and is used to bond and fix the main body of the battery cell and the inner surface of the fixing groove.

6. The battery pack according to claim 1, characterized in that: The width of the side sealing edge along the first direction is smaller than the width of the corresponding through hole along the first direction; The length of the side sealing edge along the second direction is less than the length of the corresponding through hole along the second direction, wherein the second direction is perpendicular to the first direction, and the second direction is perpendicular to the top sealing edge of the battery cell.

7. The battery pack according to claim 6, characterized in that: The width of the through hole along the first direction ranges from 0.1 mm to 2 mm.

8. An electrical device, characterized in that: The invention comprises a battery pack and a load as described in any one of claims 1 to 7, wherein the battery pack is used to supply power to the load.

9. The electrical equipment according to claim 8, characterized in that: The electrical equipment is at least one of an energy storage device, an electric vehicle, a drone and an electric tool.

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