Battery pack and electric equipment

Abstract

The invention discloses a battery pack and electric equipment, and the battery pack comprises a shell, a battery core assembly located in the shell, and a first fixing part used for bundling the battery core assembly. The shell comprises a first shell body and a second shell body which are fixed to each other. The battery cell assembly comprises a first end wall arranged along a first direction and a battery cell group, and the battery cell group comprises a plurality of battery cells arranged along the first direction; the first shell comprises a first opening for exposing part of the first end wall; the first fixing piece surrounds the outer side of the battery cell assembly in the first direction;

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] Under normal circumstances, the cycle life of lithium batteries is 300-500 charge and discharge cycles. Applying a certain amount of mechanical pressure to the battery cell can reduce the loss of active lithium, improve the battery's charge and discharge performance in the middle and late stages, and help inhibit the attenuation of battery capacity.

[0003] However, the mechanical supercharger structure of existing batteries takes up too much space and weighs too much, which limits the battery's usage scenarios and makes it impossible to apply it to lightweight products. Summary of the invention

[0004] One purpose of the embodiments of the present application is to provide a battery pack and an electrical device to improve the technical problem that existing battery packs are not suitable for lightweight applications.

[0005] According to the first aspect of the present application, the present application discloses a battery pack, including a housing, a cell assembly, a first fixing member and a connector. The housing includes a first shell and a second shell fixed to each other; the cell assembly is arranged in the housing, the cell assembly includes a first end wall and a cell group arranged along a first direction, the cell group includes a first end wall and a cell group arranged along a first direction, and the cell group includes a plurality of cells arranged along the first direction; the first housing includes a first opening, and a portion of the first end wall is exposed in the first opening; the first fixing member surrounds the outer side of the cell assembly along the first direction; the connector is arranged in the housing, and the connector is configured to be connected to an electrical device.

[0006] The first end wall reduces the area of ​​direct contact between the first fixing member and the battery cell shell, and reduces the pressure of the first fixing member directly acting on the battery cell shell. The first opening of the first shell allows the portion of the first end wall located in the first opening to act as a part of the shell, thereby improving the protection strength of the battery cell assembly, reducing the space occupied by the battery pack, and increasing the energy density of the battery pack.

[0007] In one or more optional embodiments above, the first end wall includes a first base and a first protrusion connected to the first base, and the first protrusion is located in the first opening; and the first fixing member is connected to the first base.

[0008] The thickness of the first protrusion is greater than that of the first base, and the structural strength of the first protrusion is higher. The first protrusion is exposed through the first opening, so that the first protrusion acts as the outer shell part corresponding to the area, protecting the coverage range of the first opening without increasing the overall size of the battery pack.

[0009] In one or more of the above optional embodiments, when the battery cell expands, the first opening is configured to provide a space for the first protrusion to move.

[0010] In one or more optional embodiments above, the first base includes a first sub-base and a second sub-base, the first protrusion connects the first sub-base and the second sub-base, and along the second direction, the first sub-base and the second sub-base are located on both sides of the first protrusion.

[0011] In one or more optional embodiments above, along a direction opposite to the first direction, the first protrusion is lower than the first shell body. The first protrusion does not protrude from the first shell body, thereby reducing the size of the battery pack.

[0012] In one or more optional embodiments above, the battery pack includes a second fixing member, the second fixing member surrounds the outer side of the battery cell assembly along the first direction, and the first fixing member and the second fixing member are located on both sides of the first protrusion along the second direction, and the second direction is perpendicular to the first direction. The battery cell assembly is balanced in force and has a more stable structure.

[0013] In one or more of the above optional embodiments, the battery cell assembly includes a second end wall, and along the first direction, the first end wall and the second end wall are arranged on both sides of the battery cell group; the second shell includes a second opening, and a portion of the second end wall is exposed in the second opening; the first fixing member surrounds the first end wall, the second end wall and the outside of the battery cell group along the first direction.

[0014] In one or more optional embodiments above, the second end wall includes a second base and a second protrusion connected to the second base, and the second protrusion is located in the second opening; the first fixing member is connected to the second base. The contact area between the first fixing member and / or the second fixing member and the battery cell housing is further reduced, and the pressure applied by the first fixing member and / or the second fixing member to cause the battery cell housing to deform is reduced. The portion of the second end wall located in the second opening can serve as a part of the outer shell, further improving the protection strength of the battery cell assembly, reducing the space occupied, and improving the energy density of the battery pack.

[0015] In one or more of the above optional embodiments, the second fixing member is connected to the second base.

[0016] In one or more optional embodiments above, the second base includes a third sub-base and a fourth sub-base, the second protrusion connects the third sub-base and the fourth sub-base, and along the second direction, the third sub-base and the fourth sub-base are located on both sides of the second protrusion.

[0017] In one or more of the above optional embodiments, when the battery cell expands, the second opening is configured to provide a space required for the second protrusion to move.

[0018] In one or more of the above optional embodiments, along the first direction, the second protrusion is lower than the second shell.

[0019] In one or more of the above optional embodiments, the first end wall is a carbon fiber plate, which improves the structural strength of the first end wall and reduces the overall weight of the battery pack.

[0020] In one or more of the above optional embodiments, the second end wall is a carbon fiber plate, which improves the structural strength of the second end wall and reduces the overall weight of the battery pack.

[0021] In one or more optional embodiments above, the battery cell assembly includes a buffer located between adjacent battery cells, and the buffer is configured to provide expansion space for the battery cells; in the second direction, the first end wall exceeds the buffer, wherein the second direction is perpendicular to the first direction.

[0022] When the battery pack is vibrated by external force, the buffer member prevents the first fixing member from loosening and plays a buffering role between the battery cells, thereby reducing the deformation of the side of the housing caused by force.

[0023] In one or more optional embodiments above, the battery pack includes a first adhesive member and a second adhesive member, and along the first direction, the first adhesive member adheres to the first fixing member and the first shell, and the second adhesive member adheres to the first fixing member and the second shell. The relative positions of the first fixing member, the second fixing member, the shell, and the battery cell group remain unchanged, reducing the risk of the first fixing member and the second fixing member falling off or shifting.

[0024] In one or more optional embodiments above, the battery cell is a soft-pack battery cell, the battery cell includes a shell, and the shell includes an aluminum-plastic film. The first end wall reduces the destructive effect of the first fixing member directly acting on the aluminum-plastic film, and strengthens the protection of multiple battery cells.

[0025] In one or more of the above optional embodiments, the first fixing member is a fiber tape.

[0026] In one or more of the above optional embodiments, the second fixing member is a fiber tape.

[0027] The fiber tape has strong elastic deformation ability and toughness. It has strong adhesion while also having ultra-high tensile strength and low elongation at break, which improves the reliability and service life of the battery pack.

[0028] According to a second aspect of the present application, the present application discloses an electrical device, comprising the above-mentioned battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] One or more embodiments are exemplarily described by the figures in the corresponding drawings, and these exemplary descriptions are not intended to limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements.

[0030] Figure 1 This is a schematic diagram of the overall structure of a battery pack in an embodiment of the present application;

[0031] Figure 2 An exploded diagram of a battery pack in an embodiment of the present application;

[0032] Figure 3 This is a schematic diagram of the structure of the first end wall in the embodiment of the present application;

[0033] Figure 4 This is a schematic diagram of the structure of the second end wall in the embodiment of the present application;

[0034] Figure 5 A top view of a battery pack in an embodiment of the present application;

[0035] Figure 6 for Figure 5 Middle AA section view;

[0036] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0037] Figure 8 for Figure 6 Enlarged view of point B in the middle.

[0038] The meaning of the symbols in the accompanying drawings:

[0039] Housing 1, first shell 11, first opening 111, second shell 12, second opening 121, third opening 13;

[0040] Battery cell group 2, battery cell 20;

[0041] The first end wall 3, the first base 30, the first sub-base 30a, the second sub-base 30b, and the first convex portion 31;

[0042] A first fixing member 41 and a second fixing member 42;

[0043] Buffer 5;

[0044] Connector 6, circuit board 60;

[0045] A first adhesive member 71, a second adhesive member 72, a third adhesive member 73, and a fourth adhesive member 74;

[0046] The second end wall 8 , the second base 80 , the third sub-base 80 a , the fourth sub-base 80 b , and the second convex portion 81 . DETAILED DESCRIPTION

[0047] In order to facilitate the understanding of the present invention, the present invention 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 another 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 another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Including" or "comprising" and similar words mean that the element or object appearing in front of the word covers the element or object listed after the word and its equivalent, without excluding other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Unless otherwise defined, the features such as "parallel", "perpendicular" and "same" used in the embodiments of the present invention include "parallel", "perpendicular", "same" and other situations in the strict sense, as well as "approximately parallel", "approximately perpendicular", "approximately the same" and other situations that contain a certain error. For example, the above-mentioned "approximately" may mean that the difference between the compared objects is within 10% or 5% of the average value of the compared objects. When the number of a component or element is not specifically specified in the following embodiments of the present invention, it means that the component or element may be one or more, or may be understood as at least one. "At least one" refers to one or more, and "plurality" refers to at least two.

[0048] 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 of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0049] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0050] A battery pack disclosed in an embodiment of the present application, such as Figure 1-Figure 3As shown, the battery pack includes a shell 1 and a battery assembly disposed in the shell 1. The shell 1 includes a first shell 11 and a second shell 12 fixed to each other; the battery cell assembly includes a first end wall 3 and a battery cell group 2 arranged along a first direction X, and the battery cell group 2 includes a plurality of battery cells 20 arranged along the first direction X. The number of battery cells 20 included in the battery cell group 2 can be two or more according to the actual requirements of the battery pack. The first end wall 3 is disposed between the outer side of the battery cell group 2 and the first shell 11, and the first shell 11 includes a first opening 111, and a portion of the first end wall 3 is exposed in the first opening 111. In this embodiment, the connection method between the first shell 11 and the second shell 12 is not limited, for example, a snap-fit ​​structure is used, adhesive fixation, or bolt fixation is used.

[0051] In some embodiments, the battery pack includes a first fixing member 41, which is arranged around the outside of the battery cell assembly along the first direction X. The battery cell assembly is bundled by the first fixing member 41, and pressure is applied to the battery cell group 2 to increase the charge and discharge cycle life of the battery cell 20.

[0052] The battery pack includes a connector 6, which is configured to be connected to an electrical device. The connector 6 is electrically connected to the electrodes of each battery cell 20, and the housing 1 includes a third opening 13 for exposing the connector 6. The battery cell assembly is provided with a circuit board 60 electrically connected to the electrodes of each battery cell 20, and the connector 6 is arranged on the circuit board 60, and the contacts of the connector 6 extend to the outside of the housing 1 through the third opening 13.

[0053] The first end wall 3 reduces the area of ​​direct contact between the first fixing member 41 and the shell of the battery cell 20, and reduces the pressure directly exerted by the first fixing member 41 on the battery cell shell. The first opening 111 provided in the first shell 11 enables the portion of the first end wall 3 located in the first opening 111 to act as a part of the shell 1, which can improve the protection strength of the battery cell assembly, reduce the space occupied by the battery pack, and improve the energy density of the battery pack.

[0054] In some embodiments, the battery cell 20 is a soft-pack battery cell, and the shell of the battery cell 20 includes an aluminum-plastic film. The first end wall 3 reduces the destructive effect of the first fixing member 41 directly acting on the aluminum-plastic film, and strengthens the protection of the multiple battery cells 20.

[0055] In some embodiments, the first end wall 3 is a carbon fiber board, which refers to high-strength and high-modulus fibers with a carbon content of more than 90%. The first end wall 3 is made of carbon fiber material to improve the structural strength of the first end wall 3 and reduce the overall weight of the battery pack.

[0056] In some embodiments, the first fixing member 41 is a fiber tape, which has strong elastic deformation ability and toughness, and has both strong adhesion and ultra-high tensile strength and low elongation at break, thereby improving the reliability and service life of the battery pack.

[0057] like Figure 2 As shown, the battery assembly includes a buffer 5 disposed between two adjacent battery cells 20. When the battery cell 20 expands, the buffer 5 generates elastic deformation. The pressure generated by the elastic deformation of the buffer 5 directly or indirectly acts on the first end wall 3, and then the first end wall 3 acts on the first fixing member 41, so that the first fixing member 41 is always in a tight state. When the battery pack is vibrated by external force, the buffer 5 limits the loosening of the first fixing member 41 and plays a buffering role between the battery cells 20. In addition, the battery cell 20 will expand to varying degrees when used for a long time, and the buffer 5 provides a certain expansion space for the battery cell 20.

[0058] In the second direction Y, the first end wall 3 exceeds the buffer 5. Along the second direction Y, the first end wall 3 exceeds the buffer 5, and along the direction opposite to the second direction Y, the first end wall 3 exceeds the buffer 5. The deformation caused by the side force of the housing 1 is reduced.

[0059] The second end wall 8 extends beyond the buffer member 5 along the second direction Y. The second end wall 8 extends beyond the buffer member 5 along the direction opposite to the second direction Y. The deformation caused by the side force of the housing 1 is reduced.

[0060] In some embodiments, the cushioning member 5 comprises foam.

[0061] like Figure 3 As shown, the first end wall 3 includes a first base 30 and a first convex portion 31 connected to the first base 30, and the first convex portion 31 is located in the first opening 111. The first convex portion 31 protrudes from the first base 30 in a direction opposite to the first direction X, the thickness of the first convex portion 31 is greater than the first base 30, and the first convex portion 31 and the first base 30 are integrally formed in a step structure. The first fixing member 41 is connected to the first base 30, and the pressure applied by the first fixing member 41 is dispersed to the first end wall 3 through the first base 30.

[0062] In some embodiments, Figure 3 As shown, the first base 30 includes a first sub-base 30a and a second sub-base 30b, and the first protrusion 31 connects the first sub-base 30a and the second sub-base 30b. Along the second direction Y, the first sub-base 30a and the second sub-base 30b are located on both sides of the first protrusion 31. In other embodiments, the first base 30 can be an integrated structure. The first fixing member 41 is connected to the first sub-base 30a.

[0063] The thickness of the first protrusion 31 is greater than that of the first base 30, and the structural strength of the first protrusion 31 is higher. The first protrusion 31 is exposed through the first opening 111, so that the first protrusion 31 acts as a part of the outer shell 1 corresponding to the area, and protects the coverage area of ​​the first opening 111, increases the external protection strength of the battery assembly, and improves the deformation resistance of the battery assembly.

[0064] like Figure 1 and Figure 7 As shown, along the direction opposite to the first direction X, the first protrusion 31 is lower than the first housing 11. Along the direction opposite to the first direction X, the first protrusion 31 does not protrude from the first opening 111, so that the first protrusion 31 does not increase the overall size of the battery pack. When the battery cell 20 expands, the first opening 111 provides space for the first protrusion 31 to move.

[0065] like Figure 2 As shown, the battery pack includes a second fixing member 42, which is arranged around the outer side of the battery cell assembly along the first direction X. The first fixing member 41 and the second fixing member 42 are respectively located on both sides of the first protrusion 31 along the second direction Y, wherein the second direction Y is perpendicular to the first direction X. The battery cell assembly is balanced in force and has a more stable structure. The second fixing member 42 is connected to the second sub-base 30b to fix the battery cell assembly.

[0066] In some embodiments, the second fixing member 42 is a fiber tape, which has strong elastic deformation ability and toughness, and has both strong adhesion and ultra-high tensile strength and low elongation at break, thereby improving the reliability and service life of the battery pack.

[0067] In another embodiment of the present application, Figure 2 and Figure 4 As shown, the battery cell assembly includes a second end wall 8 , and along the first direction X, the first end wall 3 and the second end wall 8 are arranged on both sides of the battery cell assembly 2 . The second housing 12 includes a second opening 121 , and a portion of the second end wall 8 is exposed in the second opening 121 .

[0068] In some embodiments, the structure of the second end wall 8 is the same as that of the first end wall 3, and the two are symmetrically arranged on both sides of the battery cell assembly along the first direction X. The second end wall 8 is arranged between the outer side of the battery cell group 2 and the second shell 12, and the first fixing member 41 surrounds the first end wall 3, the second end wall 8 and the outer side of the battery cell group 2 along the first direction X.

[0069] By providing the second end wall 8 at the other end of the battery cell assembly, the contact area between the first fixing member 41 and / or the second fixing member 42 and the battery cell housing is further reduced, and the pressure applied by the first fixing member 41 and / or the second fixing member 42 to cause the battery cell housing to deform is reduced. The portion of the second end wall 8 located in the second opening 121 can serve as a part of the housing 1, further improving the protection strength of the battery cell assembly, reducing the space occupied by the second end wall 8, and improving the energy density of the battery pack.

[0070] In some embodiments, the second end wall 8 is a carbon fiber board, which refers to high-strength and high-modulus fiber with a carbon content of more than 90%. The second end wall 8 is made of carbon fiber material to improve the structural strength of the second end wall 8 and reduce the overall weight of the battery pack.

[0071] like Figure 8 As shown, the second end wall 8 includes a second base 80 and a second protrusion 81 connected to the second base 80, and the second protrusion 81 is located in the second opening 121. The second base 80 and the second protrusion 81 are integrally in a step structure, the second protrusion 81 protrudes from the second base 80 along the first direction X, and the thickness of the second protrusion 81 is greater than that of the second base 80. The first fixing member 41 is connected to the second base 80. In this way, on one side of the battery cell assembly along the second direction Y, the first fixing member 41 surrounds the battery cell assembly along the first direction X through the first base 30 and the second base 80; on the other side of the battery cell assembly along the second direction Y, the second fixing member 42 surrounds the battery cell assembly along the first direction X through the first base 30 and the second base 80. The pressure applied by the first fixing member 41 and the second fixing member 42 directly acts on the first end wall 3 and the second end wall 8, thereby protecting the outer shell of the battery cell 20.

[0072] In some embodiments, Figure 4 As shown, the second base 80 includes a third sub-base 80a and a fourth sub-base 80b, and the second protrusion 81 connects the third sub-base 80a and the fourth sub-base 80b. Along the second direction Y, the third sub-base 80a and the fourth sub-base 80b are located on both sides of the second protrusion 81. In other embodiments, the second base 80 can be an integrated structure. The first fixing member 41 is connected to the second sub-base 80a, and the second fixing member 42 is connected to the second sub-base 80a.

[0073] The thickness of the second protrusion 81 is greater than that of the second base 80, and the structural strength of the second protrusion 81 is higher. The second protrusion 81 is exposed through the second opening 121, so that the second protrusion 81 acts as a part of the second shell 12, which protects the coverage area of ​​the second opening 121, increases the external protection strength of the battery assembly, and improves the deformation resistance of the battery assembly.

[0074] like Figure 8 As shown, along the first direction X, the second protrusion 81 is lower than the second housing 12. Along the first direction X, the second protrusion 81 does not protrude from the second opening 121, so that the second protrusion 81 does not increase the overall size of the battery pack, and when the battery cell 20 expands, the second opening 121 provides space for the second protrusion 81 to move.

[0075] In the battery assembly disclosed in this embodiment, since the restraining force of the fixing member 4 on the battery assembly mainly acts in the first direction X, the structural strength requirement of the housing 1 in the first direction X is the highest. The battery assembly is less deformed in the second direction Y, so the side structural strength requirement of the housing 1 is in the first direction X at the bottom. The first direction X and the second direction Y are perpendicular to each other. Therefore, in this embodiment, a hollow structure 14 is provided on the side of the housing 1 to reduce the overall weight of the battery assembly.

[0076] In some embodiments, the first fixing member 41 is fixedly connected to the housing 1. The battery assembly includes a first adhesive member 71 and a second adhesive member 72. Along the first direction X, the first adhesive member 71 is bonded to the first fixing member 41 and the first housing 11, and the second adhesive member 72 is bonded to the first fixing member 41 and the second housing 12. The relative positions between the first fixing member 41, the housing 1, and the battery cell group 2 remain unchanged, reducing the risk of the first fixing member 41 falling off or shifting.

[0077] In some embodiments, see Figure 7 and Figure 8 The first adhesive 71 adheres the first sub-base 30a to the first shell 11, and the second adhesive 72 adheres the third sub-base 80a to the second shell 12. The battery pack as a whole is more stable. The battery assembly includes a third adhesive 73 and a fourth adhesive 74. Along the first direction X, the third adhesive 73 adheres the second fixing member 42 to the first shell 11, and the fourth adhesive 74 adheres the second fixing member 42 to the second shell 12. The relative position between the second fixing member 42 and the shell 1 and the battery cell group 2 remains unchanged, reducing the second fixing member 42 from falling off or shifting.

[0078] In some embodiments, see Figure 7 and Figure 8 The third adhesive member 73 adheres the second sub-base 30b to the first shell 11, and the fourth adhesive member 74 adheres the fourth sub-base 80b to the second shell 12. This makes the battery pack more stable as a whole.

[0079] An embodiment of the present application discloses an electrical device, including the above-mentioned battery pack.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack, characterized in that: include: The housing comprises a first shell and a second shell fixed to each other; A battery cell assembly is disposed in the housing, the battery cell assembly comprises a first end wall and a battery cell group arranged along a first direction, the battery cell group comprises a plurality of battery cells arranged along the first direction; The first shell includes a first opening, and a portion of the first end wall is exposed in the first opening; A first fixing member, surrounding the outer side of the battery cell assembly along the first direction; A connector is provided on the housing, and the connector is configured to be connected to an electrical device.

2. The battery pack according to claim 1, characterized in that: The first end wall includes a first base and a first protrusion connected to the first base, and the first protrusion is located in the first opening; The first fixing member is connected to the first base.

3. The battery pack according to claim 2, characterized in that: In a direction opposite to the first direction, the first protrusion is lower than the first shell.

4. The battery pack according to claim 2 or 3, characterized in that: The battery pack includes a second fixing member, which surrounds the outer side of the battery cell assembly along the first direction. Along the second direction, the first fixing member and the second fixing member are located on both sides of the first protrusion, and the second direction is perpendicular to the first direction.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The battery cell assembly comprises a second end wall, and along the first direction, the first end wall and the second end wall are arranged on both sides of the battery cell group; The second shell includes a second opening, and a portion of the second end wall is exposed in the second opening; The first fixing member surrounds the first end wall, the second end wall and the outer side of the battery cell group along the first direction.

6. The battery pack according to claim 5, characterized in that: The second end wall includes a second base and a second protrusion connected to the second base, and the second protrusion is located in the second opening; The first fixing member is connected to the second base.

7. The battery pack according to claim 5 or 6, characterized in that: Along the first direction, the second protrusion is lower than the second shell.

8. The battery pack according to any one of claims 1 to 7, characterized in that: The first end wall is a carbon fiber plate.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The battery cell assembly includes a buffer located between adjacent battery cells, and the buffer is configured to provide expansion space for the battery cells; In the second direction, the first end wall exceeds the buffer member, and the second direction is perpendicular to the first direction.

10. The battery pack according to any one of claims 1 to 9, characterized in that: The battery pack includes a first adhesive member and a second adhesive member. Along the first direction, the first adhesive member bonds the first fixing member and the first shell, and the second adhesive member bonds the first fixing member and the second shell.

11. An electrical device comprising the battery pack according to any one of claims 1 to 10.

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