Battery pack and electric device

Abstract

The application discloses a battery pack and an electric device. The battery pack comprises a plurality of battery cells, a sealing part of the battery cell comprises a first sealing part, a second sealing part and a third sealing part, a tab extends out of a battery cell shell from the first sealing part, the second sealing part is arranged on two opposite sides of a containing part in a second direction, the third sealing part extends from the second sealing part and connects the first sealing part and the second sealing part, the plurality of battery cells comprises adjacent first battery cells and second battery cells, the third sealing part of the first battery cell is arranged towards the third sealing part of the second battery cell, the third sealing part of the second battery cell is arranged towards the third sealing part of the first battery cell, and a first structural member is arranged between the third sealing parts of the adjacent first battery cells and second battery cells, and the first structural member comprises an insulating material. The first structural member separates the aluminum plastic films of the adjacent battery cells, limits an electronic circulation loop between the aluminum plastic films and the negative electrodes of the battery cells, and thus improves electrochemical corrosion and improves the safety performance of the battery cells and the battery pack.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery pack and a power consumption device. BACKGROUND

[0002] In the battery pack, the distance between the plurality of battery cells is close, and the side sealing part of the battery cell is prone to deformation, which can easily cause the side sealing part of the adjacent battery cell to be connected. Once the side sealing part of the adjacent battery cell is connected, an electronic circulation loop is formed between the aluminum plastic film and the negative electrode, the aluminum plastic film is oxidized and forms an alloy with the ions (such as lithium ions) in the electrolyte, which causes the battery cell to be electrochemically corroded, and affects the safety performance of the battery cell and the battery pack. SUMMARY

[0003] Therefore, the embodiments of the present application provide a battery pack and a power consumption device to improve the problem of electrochemical corrosion caused by the connection of the side sealing parts of adjacent battery cells.

[0004] In a first aspect, the embodiments of the present application provide a battery pack, comprising a plurality of battery cells and a first structure. The plurality of battery cells are arranged in a first direction, and each battery cell comprises an electrode assembly, a battery cell shell, and a tab. The tab is connected to the electrode assembly and extends out of the battery cell shell. The battery cell shell comprises a receiving part for accommodating the electrode assembly and a sealing part extending outward from the periphery of the receiving part. The sealing part comprises a first sealing part, a second sealing part, and a third sealing part. The tab extends out of the battery cell shell from the first sealing part. The second sealing part is arranged on the opposite sides of the receiving part in a second direction. The third sealing part extends from the second sealing part and connects the first sealing part and the second sealing part. The plurality of battery cells comprises adjacent first and second battery cells. The third sealing part of the first battery cell is arranged towards the third sealing part of the second battery cell. The third sealing part of the second battery cell is arranged towards the third sealing part of the first battery cell. The first structure comprises an insulating material. In the first direction, the first structure is arranged between the third sealing part of the adjacent first battery cell and the third sealing part of the second battery cell.

[0005] The first structure separates the aluminum plastic film of the adjacent first and second battery cells, thereby limiting the electronic circulation loop between the aluminum plastic film of one of the battery cells and the negative electrode of the other battery cell, improving the electrochemical corrosion, and facilitating the improvement of the safety performance of the battery cell and the battery pack.

[0006] Optionally, the battery pack further comprises a shell for accommodating the plurality of battery cells. The shell comprises a first wall, a second wall, and a plurality of side walls. The first wall and the second wall are arranged opposite to each other in a third direction. The first structure is arranged on the first wall. The first structure extends to between the third sealing parts of the adjacent first and second battery cells in the second direction.

[0007] Optionally, the first structural member comprises a first portion and a second portion, along the first direction, the first portion is arranged between the third sealing portions of the adjacent first and second battery cells, and the second portion is arranged between the first sealing portions of the adjacent first and second battery cells. Optionally, the first portion and the second portion are integrally formed as a plate-shaped insulating member with a small thickness, which facilitates the first structural member to enter between the adjacent first and second battery cells in the scenario of assembling the first wall and the side wall.

[0008] Optionally, along the first direction, the third sealing portion is located in the projection of the first portion, which facilitates the first portion to completely isolate the third sealing portions of the adjacent first and second battery cells and improves the isolation effect.

[0009] Optionally, along the third direction, the length of the portion of the first portion arranged between the third sealing portions is H1, and the length of the portion of the second portion arranged between the first sealing portions is H2, and H1 < H2. In the scenario of assembling the first wall and the side wall along the third direction, the second portion first enters between the first sealing portions of the adjacent first and second battery cells to achieve preliminary positioning, which facilitates the first portion to enter between the third sealing portions of the adjacent first and second battery cells.

[0010] Optionally, along the third direction, the length of the third sealing portion is H0, and H1 ≥ 5%*H0, which reduces the contact between the adjacent third sealing portions during manufacturing or transportation.

[0011] Optionally, the first structural member further comprises a third portion, the third portion connects the first portion and the second portion, and an inclined surface is arranged on the side of the third portion facing the battery cell, and the inclined surface forms an acute angle with the second direction. In the scenario of assembling the first wall and the side wall along the third direction, the inclined surface facilitates the first portion to enter between the third sealing portions of the adjacent first and second battery cells.

[0012] Optionally, the first wall comprises a plurality of side plates forming a receiving space, and the first structural member is arranged in the receiving space, and the first portion is connected with the side plates.

[0013] Optionally, the plurality of battery cells further comprises a third battery cell arranged adjacent to the second battery cell, and the third sealing portion of the third battery cell is arranged away from the third sealing portion of the second battery cell, and the battery pack further comprises a second structural member arranged on the first wall, along the first direction, the second structural member is arranged between the sealing portion connection of the second battery cell and the sealing portion connection of the third battery cell, and the sealing portion connection is the connection between the first sealing portion and the third sealing portion. The second structural member can separate the aluminum plastic film of the battery cell shell in the second battery cell and the third battery cell, and improve the electrochemical corrosion.

[0014] Optionally, in the first wall, the first structural member and the second structural member can be integrally formed insulating plates, and the first structural member and the second structural member are sequentially and spaced apart along the first direction. A through hole is arranged between the adjacent first structural member and the second structural member. The tab of the battery cell passes through the through hole and extends to the outside of the first wall. The through hole can facilitate rapid heat dissipation of the battery cell.

[0015] Optionally, the plurality of side walls include a first side wall and a second side wall oppositely arranged along the second direction, and the first structural member is arranged in at least one of the first side wall and the second side wall.

[0016] Optionally, the battery cell shell includes an aluminum plastic film.

[0017] Optionally, a through hole is arranged between the adjacent first structural member and the second structural member. The tab passes through the through hole and extends to the outside of the shell.

[0018] Optionally, the second structural member includes a fourth portion and a fifth portion. Along the first direction, the fourth portion is arranged between the sealing portion connecting portion of the second battery cell and the sealing portion connecting portion of the third battery cell, and the fifth portion is arranged between the first sealing portion of the second battery cell and the first sealing portion of the third battery cell.

[0019] Optionally, along the first direction, the orthographic projection of the sealing portion connecting portion is located in the orthographic projection of the fourth portion.

[0020] Optionally, the first structural member and the second structural member each include a convex portion, and the convex portion includes an inclined surface. An included angle between the inclined surface and the third direction is an acute angle.

[0021] Optionally, along the third direction, the length of the convex portion is not more than the length of the portion of the second portion arranged between the first sealing portions. The tab can be guided during the assembly process, which is conducive to the tab passing through the through hole.

[0022] Optionally, the plurality of battery cells are divided into a plurality of columns. Each column of battery cells includes a plurality of groups. Each group includes a first battery cell and a second battery cell. The shell is provided with a partition. Two adjacent columns of battery cells are separated by the partition. The partition can be used to separate the aluminum plastic films of the two adjacent columns of battery cells, thereby improving the electrochemical corrosion.

[0023] Optionally, along the first direction, the orthographic projection of the portion of the first portion arranged between the adjacent third sealing portions is located in the orthographic projection of the first sealing portion.

[0024] Optionally, the first structural member is made of an insulating material, such as plastic.

[0025] Optionally, the second structural member is made of an insulating material, such as plastic.

[0026] In a second aspect, an embodiment of the present application provides a power utilization device, which includes a load and the battery pack of any one of the above-mentioned embodiments. The battery pack supplies power to the load.

[0027] In the battery pack and the electric device of the present application, the insulating member is arranged between the side sealing parts of the adjacent battery cells, the aluminum plastic film of the adjacent battery cells is separated by the insulating member, and the electronic circulation loop between the aluminum plastic film and the negative electrode is limited, so as to improve the electrochemical corrosion and improve the safety performance of the battery cell and the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 and Figure 2 is a structural schematic diagram of the battery pack of an embodiment of the present application;

[0029] Figure 3 is a schematic diagram of the assembly of the battery cell module and the shell of an embodiment of the present application;

[0030] Figure 4 is a cross-sectional schematic diagram of the assembly of the first structural member and the second structural member and the battery cell module of an embodiment of the present application;

[0031] Figure 5 is another cross-sectional schematic diagram of the assembly of the first structural member and the second structural member and the battery cell module of an embodiment of the present application;

[0032] Figure 6 is a structural schematic diagram of the battery cell of an embodiment of the present application;

[0033] Figure 7 is a schematic diagram of the positions of two adjacent battery cells of the present application;

[0034] Figure 8 is a schematic diagram of the positions of a plurality of battery cells in the battery cell module of the present application;

[0035] Figure 9 is a structural schematic diagram of the first wall of an embodiment of the present application;

[0036] Figure 10 is an enlarged schematic diagram of the area indicated by the dashed line in Figure 9

[0037] Figure 11 is a structural schematic diagram of the protrusion indicated in Figure 9

[0038] Figure 12 is a partial structural schematic diagram of the battery pack of another embodiment of the present application;

[0039] Figure 13 is an enlarged schematic diagram of the area I indicated by the dashed line in Figure 12

[0040] Figure 14 is an enlarged schematic diagram of the area II indicated by the dashed line in Figure 12 DETAILED DESCRIPTION​​​​

[0041] In order to make the purposes, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly below in conjunction with embodiments and drawings. Obviously, the described embodiments are only some of the embodiments but not all. Based on the embodiments in the present application, the following various embodiments and their technical features can be combined with each other without conflict.

[0042] In specific scenarios, the battery pack includes but is not limited to all kinds of primary batteries, secondary batteries, fuel cells, solar cells and capacitor (for example, super capacitor) batteries. The battery pack can preferably be a lithium secondary battery, including but not limited to a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery and a lithium ion polymer secondary battery. Any cell in the battery pack includes but is not limited to a soft package cell.

[0043] First Embodiment

[0044] Please refer to Figures 1 to 9 , the battery pack 1 includes a cell module 10 and a first structural member 121. The cell module 10 includes a plurality of cells 11 stacked along a first direction x. The cell 11 includes an electrode assembly (not shown in the figure), a cell shell 12 and a tab 13. The tab 13 is connected to the electrode assembly and extends out of the cell shell 12. The first structural member 121 includes an insulating material. Optionally, the first structural member 121 is made of an insulating material, such as plastic. Optionally, the outer surface of the first structural member 121 is an insulating material.

[0045] The cell shell 12 includes a receiving portion 12a for receiving the electrode assembly (not shown in the figure) and a sealing portion 12b extending outward from the periphery of the receiving portion 12a. The sealing portion 12b includes a first sealing portion 12c, a second sealing portion 12d and a third sealing portion 12e, the tab 13 extends out of the cell shell 12 from the first sealing portion 12c, the second sealing portion 12d is arranged on the opposite sides of the receiving portion 12a along a second direction y, and the third sealing portion 12e extends from the second sealing portion 12d and connects the first sealing portion 12c and the second sealing portion 12d. The second direction y is perpendicular to the first direction x.

[0046] Please continue to refer to Figures 1 to 8The arrangement of the plurality of battery cells 11 can be as follows: two adjacent battery cells 11 form a group, and the two battery cells 11 include a first battery cell 111 and a second battery cell 112. The third sealing portion 12e of the first battery cell 111 is arranged on the side of the first sealing portion 12c of the first battery cell 11 close to the second battery cell 112, and the third sealing portion 12e of the second battery cell 112 is arranged on the side of the first sealing portion 12c of the second battery cell 112 close to the first battery cell 111. The third sealing portion 12e of the first battery cell 111 is arranged towards the third sealing portion 12e of the second battery cell 112, and the third sealing portion 12e of the second battery cell 112 is arranged towards the third sealing portion 12e of the first battery cell 111.

[0047] In each group, along the first direction x, the first structural member 121 is arranged between the third sealing portion 12e of the first battery cell 111 and the third sealing portion 12e of the second battery cell 112. The battery cell shell 12 includes an aluminum plastic film, and the first structural member 121 can be used to separate the aluminum plastic film of the first battery cell 111 and the second battery cell 112, thereby limiting the electronic circulation loop between the aluminum plastic film of one of them and the negative electrode of the other, improving the electrochemical corrosion, and being conducive to improving the safety performance of the battery cell 11 and the battery pack 1.

[0048] In the battery cell module 10, a plurality of battery cells 11 can be combined to form an effective power supply and / or charging unit of the battery pack 1 through series connection or parallel connection. The number of battery cells 11 can be determined according to the power demand. Optionally, as shown in FIG. 1B, the tab 13 of the plurality of battery cells 11 can be arranged on the same side of the battery pack 1, and in this case, the tabs 12 of the first battery cell 111 and the second battery cell 112 are also arranged on the same side of the battery pack 1. Figures 1 to 3

[0049] The battery cell 11 can also include electrolyte and the like arranged in the accommodating portion 12a. In the case where the battery cell 11 includes positive and negative electrodes, the electrode assembly includes positive and negative electrode plates and a separator arranged between the positive and negative electrode plates. The electrode assembly can be formed by winding or stacking a plurality of electrode plates, one end of the tab 13 extends into the battery cell shell 12 and is electrically connected to the electrode plate of the corresponding polarity, and the other end of the tab 13 extends out of the battery cell shell 12. The tab 13 includes a first tab 13a and a second tab 13b, the first tab 13a is a negative tab, and the second tab 13b is a positive tab, the first tab 13a is electrically connected to the negative electrode plate and extends from inside the battery cell shell 12 to outside the battery cell shell 12, and the second tab 13b is electrically connected to the positive electrode plate and extends from inside the battery cell shell 12 to outside the battery cell shell 12. In other embodiments, the first tab 13a can be a positive tab, and the second tab 13b can be a negative tab. In some cases, only one of them is described as an example to describe the structure of the tab 13 of the present application.

[0050] ​The cell shell 12 can be used to form the shape of the cell 11, and can also be used to define the appearance of the cell 11. The electrode assembly, electrolyte and other internal elements are contained in the accommodation portion 12a, and the internal elements are protected by the cell shell 12, thereby improving the protection effect and safety of the cell 11.

[0051] The sealing portion 12b can be used to seal and limit the leakage of electrolyte from the end portion and the entry of impurities such as water and oxygen outside the cell shell 12 into the accommodation portion 12a. The first sealing portion 12c can be used to seal the junction of the cell shell 12 and the tab 13.

[0052] Please refer to Figures 1 to 5 , the battery pack 1 further comprises a shell 30 for accommodating a plurality of cells 11, and the cell module 10 is generally rectangular as a whole. Optionally, the shell 30 comprises a first wall 31, a second wall 32 and four side walls, which comprise a first side wall 331, a second side wall 332, a third side wall 333 and a fourth side wall 334. The first wall 31 is arranged adjacent to the tab 13 of the cell 11, and the first wall 31 and the second wall 32 are arranged opposite to each other along the third direction z. The four side walls are connected between the first wall 121 and the second wall 122, the first side wall 331 and the second side wall 332 are arranged opposite to each other along the second direction y, and the third side wall 333 and the fourth side wall 334 are arranged opposite to each other along the first direction x. The second direction y is perpendicular to the plane in which the first direction x and the third direction z lie, and the first direction x and the third direction z can be perpendicular.

[0053] In some scenarios, the second wall 32 and the four side walls can be an integrally formed structure, and the first wall 31 is detachably connected to the side walls to accommodate and protect the cell module 10. For example, as shown in Figures 1 to 3 , the third side wall 333 and the fourth side wall 334 are provided with protrusions 33a, and the two side edges of the first wall 31 along the first direction x are provided with sockets 31a. The protrusions 33a are inserted into the corresponding sockets 31a, and the first wall 331 is installed and fixed on the side wall to form an accommodation cavity 30a. The number of sockets 31a and protrusions 33a can be multiple, which is beneficial to enhance the stability of the structural connection. It should be understood that Figures 1 to 3 , the number of sockets 31a and protrusions 33a shown is only for example.

[0054] A plurality of cells 11 can be arranged in the shell 30 in a predetermined manner, for example, the plurality of cells 11 are divided into a plurality of columns, each column of cells 11 comprises a plurality of groups, and each group comprises a first cell 111 and a second cell 112. The shell 30 is provided with a partition 30b, and two adjacent columns of cells 11 are separated by a partition 30b. Optionally, the partition 30b comprises an insulating member comprising an insulating material, and the partition 30b can be used to separate the aluminum plastic film of the two adjacent columns of cells 11 to improve the electrochemical corrosion.

[0055] The first structural member 121 is disposed on the first wall 31 and extends along a third direction z between the third sealing portion 12e of the adjacent first cell 111 and the third sealing portion 12e of the second cell 112. In some scenarios, for example, please refer to Figure 4 , Figure 5 , Figures 8 to 10 As shown, the first structural member 121 includes a first portion 121a and a second portion 121b. Along the first direction x, the first portion 121a is disposed between the third sealing portion 12e of adjacent first cells 111 and the third sealing portion 12e of adjacent cells 112, and the second portion 121b is disposed between the first sealing portion 12c of adjacent first cells 111 and the first sealing portion 12c of adjacent cells 112. Optionally, the first structural member 121 includes two first portions 121a, and the second portion 121b is disposed between the two first portions 121a. Optionally, the first portions 121a and the second portion 121b are plate-shaped insulating members, which facilitates the insertion of the first structural member 121 between the first cells 111 and the second cells 112 in scenarios where the first wall 31 is assembled with the side wall.

[0056] In some embodiments, along the first direction x, the orthographic projection of the third sealing portion 12e is at least partially located within the orthographic projection of the first portion 121a, which facilitates the first portion 121a to isolate the third sealing portion 12e of the adjacent first cell 111 and the third sealing portion 12e of the second cell 112, thereby improving the isolation effect and mitigating electrochemical corrosion.

[0057] like Figure 4 and Figure 5 As shown, along the third direction z, the length of the portion of the first part 121a between the third sealing portions 12e is H1, and the length of the portion of the second part 121b between the first sealing portions 12c is H2, and H1 < H2.

[0058] In the scenario where the first wall 31 is assembled with the side wall along the third direction z, the second part 121b first extends between the first sealing portions 12c of adjacent first cells 111 and second cells 112 for initial positioning, thereby facilitating the entry of the first part 121a between the third sealing portions 12e of adjacent first cells 111 and second cells 112. Optionally, along the first direction x, the orthographic projection of the portion of the first part 121a disposed between the third sealing portions 12e lies within the orthographic projection of the first sealing portion 12c.

[0059] In the third direction z, the length of the third sealing portion 12e is H0, which can be the length of the third sealing portion 12e protruding from the end face of the accommodating portion 12a. Optionally, H1≥5%*H0. In the scenario where the first wall 31 is assembled with the side wall in the third direction z, the first portion 121a extends into from the free end of the third sealing portion 12e, and the first portion 121a extends to a length between the third sealing portions 12e greater than or equal to 5% of the height of the third sealing portion 12e, which can reduce the contact between adjacent third sealing portions 12e during manufacturing or transportation.

[0060] Please refer to Figure 8 , Figure 9 and Figure 10 In an embodiment, the first structure 121 further comprises a third portion 121c disposed between the first portion 121a and the second portion 121b. The third portion 121c is provided with an inclined surface 121d facing one side of the battery cell 11, and the inclined surface 121d forms an acute angle with the second direction y. In the scenario where the first wall 31 is assembled with the side wall in the third direction z, the inclined surface 121d is beneficial to guide the first portion 121a into between the third sealing portion 12e of the adjacent first battery cell 111 and the third sealing portion 12e of the second battery cell 112.

[0061] Please continue to refer to Figures 1 to 5 The plurality of battery cells 11 further comprises a third battery cell 113, which is disposed adjacent to the second battery cell 112 for two groups adjacent in the first direction x. The third sealing portion 12e of the third battery cell 113 is disposed away from the third sealing portion 12e of the second battery cell 112, and it should be understood that in a single group, the third battery cell 113 can also be the first battery cell 111 or the second battery cell 112.

[0062] The first wall 31 can further be provided with a second structure 122 comprising an insulating material. In the first direction x, the second structure 122 is disposed between the sealing portion connecting portion 12f of the adjacent second battery cell 112 and the sealing portion connecting portion 12f of the third battery cell 113, and the sealing portion connecting portion 12f is the connecting portion of the first sealing portion 12c and the third sealing portion 12e. The second structure 122 can separate the aluminum plastic film of the battery cell shell 12 of the second battery cell 112 and the third battery cell 113, which is beneficial to improve the electrochemical corrosion. Optionally, the second structure 122 is made of an insulating material, such as plastic. Optionally, the outer surface of the second structure 122 is an insulating material.

[0063] In some scenarios, such as Figure 4 , Figure 5 and Figures 8 to 10As shown, the second structural member 122 includes a fourth portion 122a and a fifth portion 122b. The fourth portion 122a is arranged between the sealing portion joint 12f of the adjacent second cell 112 and the sealing portion joint 12f of the third cell 113 along the first direction x. The fifth portion 122b is arranged between the first sealing portion 12c of the adjacent second cell 112 and the first sealing portion 12c of the third cell 113. Optionally, the fourth portion 122a and the fifth portion 122b can be plate-shaped insulating structural members, which are beneficial for the second structural member 122 to enter between the second cell 112 and the third cell 113 in the scenario of assembling the first wall 31 with the side wall.

[0064] In an embodiment, the orthographic projection of the sealing portion joint 12f is at least partially located within the orthographic projection of the fourth portion 122a, which is beneficial for the fourth portion 122a to isolate the sealing portion joint 12f of the adjacent second cell 112 and the sealing portion joint 12f of the third cell 113, thereby improving the isolation effect and the electrochemical corrosion.

[0065] Along the third direction z, the length of the portion of the fourth portion 122a arranged between the sealing portion joints 12f is H21, and the length of the portion of the fifth portion 122b arranged between the first sealing portions 12c is H22, and H21 < H22. In the scenario of assembling the first wall 31 with the side wall along the third direction z, the fifth portion 122b first enters between the first sealing portions 12c of the adjacent second cell 112 and the third cell 113, which is beneficial for the fourth portion 122a to enter between the sealing portion joint 12f of the adjacent second cell 112 and the sealing portion joint 12f of the third cell 113.

[0066] Please refer to Figure 8 , Figure 9 and Figure 10 In an embodiment, the second structural member 122 further includes a sixth portion 122c arranged between the fourth portion 122a and the fifth portion 122b. The sixth portion 122c is provided with an inclined surface 122d on the side facing the cell 11, and the inclined surface 122d forms an acute angle with the second direction y. In the scenario of assembling the first wall 31 with the side wall along the third direction z, the inclined surface 122d is beneficial for guiding the fourth portion 122a to enter between the sealing portion joint 12f of the adjacent second cell 112 and the sealing portion joint 12f of the third cell 113.

[0067] In an embodiment, the first structural member 121 and the second structural member 122 are substantially the same.

[0068] Please continue to refer to Figures 1 to 10The first wall 31 can include a plurality of side plates 311 forming a receiving space, for example, four side plates 311 connected end to end to form a receiving space. The first structure 121 and the second structure 122 are arranged in the receiving space. Two first portions 121a of the first structure 121 are respectively connected with two side plates 311 arranged opposite along the second direction y, which facilitates isolation of the third sealing portion 12e of the adjacent first battery cell 111 and second battery cell 112. Two fourth portions 122a of the second structure 122 are respectively connected with two side plates 311 arranged opposite along the second direction y, which facilitates isolation of the sealing portion connection 12f of the adjacent second battery cell 112 and the sealing portion connection 12f of the third battery cell 113.

[0069] In the first wall 31, the first structure 121, the second structure 122, and other parts of the first wall 31 can be an insulating plate integrally formed, for example, by a low-pressure injection molding process. Along the first direction x, the first structure 121 and the second structure 122 are sequentially and spaced apart, and a through hole 124 is arranged between adjacent first structure 121 and second structure 122. The tab 13 of the battery cell 11 passes through the through hole 124 and extends out of the shell 30. The through hole 124 can facilitate rapid heat dissipation of the battery cell 11.

[0070] Please continue to refer to Figure 8 、 Figure 9 、 Figure 10 and Figure 11 The first structure 121 and the second structure 122 can be provided with a plurality of protrusions 123, and the protrusions 123 towards the side surface of the sealing portion 12b include an inclined surface 123a. Along the third direction z, the included angle a between the inclined surface 123a and the third direction z is an acute angle. In an embodiment, the protrusion 123 is arranged on the second portion 121b, and along the third direction z, the length of the protrusion 123 is not more than the length H2 of the portion of the second portion 121b arranged between the first sealing portions 12c. The protrusion 123 can guide the tab 13 during assembly, which facilitates the tab 13 passing through the through hole 124.

[0071] It should be understood that in other embodiments, one of the first structure 121 and the second structure 122 can be provided with the protrusion 123, and the other one can not be provided with the protrusion 123.

[0072] Optionally, along the third direction z, the thickness of any one of the first structure 121 and the second structure 122 can decrease, for example, the thickness of the second portion 121b of the first structure 121 decreases, and the thickness of the fifth portion 122b of the second structure 122 decreases.

[0073] Second embodiment

[0074] For structural elements with the same name, the same reference numerals are used in the embodiments of the present application. Based on the description of the foregoing embodiments, the main difference is that Figures 12 to 14 The first structure 121 is arranged on the first side wall 331 and the second side wall 332, and the first side wall 331 and the second side wall 332 are arranged opposite to each other along the second direction y. Along the first direction x, the first structure 121 is arranged between the third sealing part 12e of the adjacent first battery cell 111 and the third sealing part 12e of the second battery cell 112. Optionally, the first structure 121, the first side wall 331 and the second side wall 332 are integrally formed by an injection molding process.

[0075] The first structure 121 can include an insulating plate, and extends to between the third sealing part 12e of the adjacent first battery cell 111 and the third sealing part 12e of the second battery cell 112 along the second direction y.

[0076] Optionally, along the third direction z, the width of the first structure 121 gradually decreases, which is conducive to guiding the first structure 121 into between the third sealing part 12e of the adjacent first battery cell 111 and the second battery cell 112.

[0077] In the embodiment, along the third direction z, the length of the first structure 121 extending into between the third sealing part 12e of the adjacent first battery cell 111 and the second battery cell 112 is H1. The height H1 of the first structure 121 can still satisfy: H1≥5%*H0.

[0078] As shown in FIG. 1, Figures 12 to 14 The plurality of battery cells 11 are arranged in a column in the shell 30, and the plurality of battery cells 11 include a plurality of groups, and each group includes a first battery cell 111 and a second battery cell 112. The second structure 122 can be a side plate originally provided in the shell 30, and is arranged between two adjacent groups.

[0079] Another embodiment of the present application provides a power utilization device, which includes a load and the battery pack 1 of any of the foregoing embodiments, and the battery pack 1 supplies power to the load.

[0080] The power utilization device can be implemented in various specific forms. For example, in actual application scenarios, the power utilization device includes but is not limited to: a backup power supply, a drone, a unicycle, a two-wheeled or more than two-wheeled electric vehicle, a motorcycle, a bicycle, a lighting appliance, a toy, a power tool, a commercial or household energy storage system, etc.

[0081] Since the power utilization device has the battery pack 1 of any of the foregoing embodiments, the power utilization device can have the beneficial effects of the battery pack 1 of the corresponding embodiment.

[0082] The above merely describes some embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made by using the content of the specification and drawings is also included in the patent protection scope of the present application.

[0083] Without more limitations, the element defined by the sentence "including one" does not exclude the presence of another same element in the process, method, article or device including the element, in addition, the components, features, elements with the same name in different embodiments may have the same meaning or different meaning, and the specific meaning needs to be determined according to its explanation in the specific embodiment or further combined with the context in the specific embodiment.

[0084] In addition, in the description of the embodiments of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the technical solutions of the corresponding embodiments of the present application and simplifying the description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

[0085] Although the terms "first", "second", "third" and the like are used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. As used herein, the singular forms "a", "an" and "the" are intended to include plural forms as well. The terms "or" and "and / or" are interpreted as inclusive, or mean any one or any combination. Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

Claims

1. A battery pack, comprising a plurality of battery cells stacked along a first direction, each battery cell comprising an electrode assembly, a cell housing, and a tab connected to the electrode assembly and extending out of the cell housing, the cell housing comprising a receiving portion for receiving the electrode assembly and a sealing portion extending outward from a periphery of the receiving portion, the sealing portion comprising a first sealing portion, a second sealing portion, and a third sealing portion, the tab extending out of the cell housing from the first sealing portion, the second sealing portion being disposed on opposite sides of the receiving portion along a second direction, and the third sealing portion extending from the second sealing portion and connecting the first sealing portion and the second sealing portion, wherein the plurality of battery cells comprises a first battery cell and a second battery cell adjacent to each other, the third sealing portion of the first battery cell is disposed towards the third sealing portion of the second battery cell, and the third sealing portion of the second battery cell is disposed towards the third sealing portion of the first battery cell, wherein the battery pack further comprises a first structural member comprising an insulating material, the first structural member comprising a first portion and a second portion, the first portion being disposed between a free end of the third sealing portion of the first battery cell and a free end of the third sealing portion of the second battery cell along the first direction, and the second portion being disposed between the first sealing portion of the first battery cell and the first sealing portion of the second battery cell, and the second direction being perpendicular to the first direction. characterized in that The battery pack further comprises a housing accommodating the plurality of battery cells, the housing comprising a first wall, a second wall, and a plurality of side walls, the first wall and the second wall being disposed opposite to each other along a third direction, the first structural member being disposed on the first wall, the first structural member extending to between the third sealing portion of the first battery cell and the third sealing portion of the second battery cell along the second direction, the third direction being perpendicular to the first direction, and the second direction being perpendicular to a plane in which the first direction and the third direction lie. In the first direction, a projection of the third sealing portion is at least partially located within a projection of the first portion.

2. The battery pack of claim 1, wherein, In the third direction, a length of a portion of the first portion between the third sealing portions is H1, a length of a portion of the second portion between the first sealing portions is H2, and H1 < H2.

3. The battery pack of claim 2, wherein, The first structural member further comprises a third portion connecting the first portion and the second portion, the third portion being provided with an inclined surface towards one side of the battery cell, the inclined surface forming an acute angle with the second direction.

4. The battery pack of claim 2, wherein, The first wall comprises a plurality of side plates forming an accommodation space, the first structural member being disposed in the accommodation space, and the first portion being connected to the side plates.

5. The battery pack of claim 4, wherein, In the third direction, the length of the third sealing portion is H0, and H1≥5% H0.

6. The battery pack of claim 4, wherein, The plurality of battery cells further comprises a third battery cell disposed adjacent to the second battery cell, the third sealing portion of the third battery cell being disposed away from the third sealing portion of the second battery cell.

7. The battery pack of claim 2, wherein, The battery pack further comprises a second structural member disposed on the first wall, the second structural member being disposed between a sealing portion connection of the second battery cell and a sealing portion connection of the third battery cell along the first direction, the sealing portion connection being a connection between the first sealing portion and the third sealing portion.

8. The battery pack according to any one of claims 2 to 7, characterized by, ​ ​ 9. The battery pack of claim 1, wherein, The battery pack further includes a housing accommodating the plurality of battery cells, the housing including a first side wall and a second side wall oppositely arranged along a second direction, the first structural member being arranged at at least one of the first side wall and the second side wall.

10. The battery pack of claim 2, wherein, The battery cell housing includes an aluminum plastic film.

11. The battery pack of claim 8, wherein, The first structural member and the second structural member are provided with a through hole therebetween, the tab passing through the through hole and extending out of the first wall.

12. The battery pack of claim 8, wherein, The second structural member includes a fourth portion and a fifth portion, the fourth portion being arranged between the sealing portion connection of the second battery cell and the sealing portion connection of the third battery cell, and the fifth portion being arranged between the first sealing portion of the second battery cell and the first sealing portion of the third battery cell along the first direction.

13. The battery pack of claim 12, wherein, The normal projection of the sealing portion connection is located within the normal projection of the fourth portion along the first direction.

14. The battery pack of claim 8, wherein, The first structural member and the second structural member each include a convex portion, the convex portion including an inclined surface, an included angle between the inclined surface and the third direction being an acute angle.

15. An electrical device, characterized by The battery pack of any one of claims 1 to 14, the battery pack powering a load.

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