Battery cell unit, battery pack, and electrical equipment

Abstract

To provide a battery cell unit, a battery pack, and an electric apparatus that are advantageous for pressure blinking and have reduced adverse effect on the safety property of a battery cell.SOLUTION: A battery cell unit includes a battery cell including a battery cell case, and a bracket. The battery cell case has a body part, and a first encapsulation part. The bracket has a first portion. The first portion and the body part are aligned along a first direction. The first portion covers a part of a first connection part. The first portion has a first segment and a second segment. The first segment covers a part of a first edge face and a part of an outer face of the first connection part. The second segment is connected to the first segment. A first region is located outside of the second segment. When observed along a second direction, the first segment and the second segment form a notch. The notch is separate from the body part. The first region is located in the notch. The first direction is perpendicular to the second direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present application relates to the field of energy storage technology, and in particular to battery cell units, battery packs and electrical devices. [Background technology]

[0002] The battery cells in a battery pack are sealed to the battery cell case by a sealing part, and in the past it was common to cover the entire sealing part with a bracket or inject adhesive to protect the sealing part, but this is disadvantageous for releasing pressure inside the battery cell and affects the safety of the battery cell. Summary of the Invention

[0003] Therefore, it is necessary to provide a battery cell unit, a battery pack, and an electrical device that are advantageous in terms of pressure relief and can reduce the impact on the safety of the battery cells.

[0004] An embodiment of the present application provides a battery cell unit including a battery cell and a bracket. The battery cell includes an electrode assembly, a battery cell case, and an electrode terminal. The electrode terminal is connected to the electrode assembly and extends from the battery cell case. The battery cell case includes a main body and a first sealing portion. The electrode assembly is provided in the main body. The first sealing portion includes a first connection portion. The electrode terminal extends from the first connection portion through the battery cell case. The bracket includes a first portion. The first portion and the main body are aligned along a first direction. The first portion covers a portion of the first connection portion. The electrode terminal protrudes from the first portion. The first connection portion includes a first end surface. The first end surface includes a first region. The first portion includes a first segment and a second segment. The first segment covers a portion of the first end surface and a portion of the outer surface of the first connection portion. The second segment is connected to the first segment, and the first region is located outside the second segment. When viewed along the second direction, the first segment and the second segment form a notch. The notch is away from the main body portion. The first region is located within the notch. The first direction is perpendicular to the second direction. The first portion of the present application covers the first connection portion, providing increased protection for the first sealing portion and improving the sealing of the battery cell. By positioning the first region within the notch and the second segment connected to the first segment and positioning the first region outside the second segment, when the battery cell expands, the pressure inside the battery cell can impact the second segment first. This causes the second segment to protrude away from the first connection portion, and the pressure inside the battery cell is released through the first region within the notch, which is advantageous for pressure release and improves the safety of the battery cell unit.

[0005] Alternatively, in some embodiments of the present application, the first segment includes a first sub-segment and a second sub-segment. The first sub-segment and the second sub-segment are arranged at an interval along the third direction. The second segment connects the first sub-segment and the second sub-segment. The electrode terminal protrudes from the second sub-segment. The first direction, the second direction, and the third direction are perpendicular to each other.

[0006] Alternatively, in some embodiments of the present application, a second segment is provided between the first region and the main body portion along the first direction when viewed along the second direction, which is advantageous for depressurization.

[0007] Alternatively, in some embodiments of the present application, the first sealing portion includes a first folded portion and a second folded portion. The first connecting portion connects the first folded portion and the second folded portion. The first folded portion and the second folded portion are spaced apart along the third direction. The bracket includes a first side portion and a second side portion aligned along the third direction. The first portion connects the first side portion and the second side portion. The first side portion covers the first folded portion. The second side portion covers the second folded portion. When observed along the second direction, a portion of the first connecting portion is located between the first side portion and the second side portion in the third direction. Covering a portion of the first sealing portion with the bracket increases protection for the first sealing portion, and providing a portion of the first connecting portion between the main body portion and the first portion and between the first side portion and the second side portion provides an expansion space for the first sealing portion, which is advantageous for releasing pressure.

[0008] Alternatively, in some embodiments of the present application, when the distance between the electrode terminal and the notch along the third direction is L1 and the distance between the electrode terminal and the first side portion is L2, L1<1 / 2L2, which reduces the risk of gas pressure leaking from the first region in the notch damaging the electrode terminal and affects the connection of adjacent electrode terminals.

[0009] Alternatively, in some embodiments of the present application, by making the distance L3 between the notch and the electrode terminal smaller than the distance L4 between the notch and the first side portion, the amount of heat generated at the electrode terminal becomes higher, which is more advantageous for pressure relief.

[0010] Alternatively, in some embodiments of the present application, the second segment includes a first sub-segment and a second sub-segment, and the first segment and the second segment are provided on either side of the first connecting portion along the second direction.

[0011] Alternatively, in some embodiments of the present application, the first sub-segment and the second sub-segment are arranged such that when subjected to pressure inside the battery cell, the first sub-segment and the second sub-segment protrude in a direction away from the first connection portion, which is advantageous for releasing pressure.

[0012] Alternatively, in some embodiments of the present application, the first connection portion includes two second segments. The first and second segments form two notches when viewed in the second direction. In the third direction, the electrode terminal is located between the two notches. Providing two notches further facilitates pressure release, further improving the safety of the battery cell unit.

[0013] Alternatively, in some embodiments of the present application, when observed along the second direction, the width of the notch along the third direction gradually decreases along the first direction, which is advantageous for increasing the accommodation space of the notch, allowing it to accommodate more of the first connection portion and part of the first region, and is also advantageous for releasing pressure, thereby improving the safety of the battery cell unit.

[0014] Alternatively, in some embodiments of the present application, the main body includes a first wall. The first connecting portion is connected to the first wall. The bracket includes a second portion. The second portion covers a portion of the first wall and is advantageous for protection against the first sealing portion. The second portion and the second segment are spaced apart, which is advantageous for pressure relief.

[0015] Alternatively, in some embodiments of the present application, when observed along the second direction, the second portion, the first portion, the first side portion, and the second side portion surround each other to form a first space, and a portion of the first connection portion is located within the first space. The first portion, the first side portion, the second side portion, and the second portion protect the periphery of the first connection portion, thereby reducing the effect of expansion of the battery cell on the sealing performance of the first sealing portion.

[0016] Alternatively, in some embodiments of the present application, when observed along the second direction, the first space is a closed space, which is advantageous for depressurizing the battery cell.

[0017] Alternatively, in some embodiments of the present application, the bracket may include an insulating bracket to reduce the risk of shorting with the battery cells.

[0018] Alternatively, in some embodiments of the present application, the bracket is integrally molded with the battery cell, which is advantageous in improving the connection strength between the bracket and the battery cell.

[0019] Alternatively, in some embodiments of the present application, when observed along the second direction, the first connection portion connects the first end surface and includes a first connection region located within the notch, which is advantageous for improving pressure relief of the battery cell.

[0020] Alternatively, in some embodiments of the present application, when viewed along the second direction, the first connection portion includes a second connection region located within the first space, and the first connection region and the second connection region are spaced apart, which is advantageous for improving pressure relief of the battery cell.

[0021] Alternatively, in some embodiments of the present application, the second segment is U-shaped, which is advantageous for improving pressure relief of the battery cells.

[0022] Alternatively, in some embodiments of the present application, the notch has a U-shape when observed along the second direction, which is advantageous for improving pressure relief of the battery cell.

[0023] Alternatively, in some embodiments of the present application, the second segment exceeds the first segment in the first direction, so that when the battery cell expands, the pressure inside the battery cell can be applied to the second segment in advance, which is advantageous for releasing the pressure.

[0024] Alternatively, in some embodiments of the present application, when observed along the opposite direction to the second direction, the first segment and the second segment form a notch, the notch being spaced apart from the main body portion, and the first region being located within the notch, which is advantageous for depressurization.

[0025] Alternatively, in some embodiments of the present application, the distance H between the second segment and the first segment in the first direction satisfies H≧2 mm, so that the pressure inside the battery cell acts on the second segment first, which is advantageous for depressurization.

[0026] Alternatively, in some embodiments of the present application, when observed along the first direction, the second portion does not protrude from the main body portion in the second direction. When adjacent battery cell cases come into contact and are connected, a gap exists between the adjacent second portions, which reduces the effect of pressure on the second portions exerted between the adjacent battery cell cases and reduces the biasing force on the first sealing portion, which is advantageous for protecting the first sealing portion and for stabilizing the connection between the bracket and the battery cell.

[0027] Alternatively, in some embodiments of the present application, when observed along the first direction, the first side portion does not protrude from the main body portion in the second direction. The second side portion does not protrude from the main body portion. When adjacent battery cell cases come into contact and are connected, a gap exists between the adjacent first side portions and a gap exists between the adjacent second side portions. This reduces the influence of pressure mutually applied between the adjacent battery cell cases on the first side portions and the second side portions, reducing the biasing force on the first sealing portion, which is advantageous for protecting the first sealing portion and for stabilizing the connection between the bracket and the battery cell.

[0028] One embodiment of the present application provides a battery pack including an outer case and a plurality of battery cell units according to any of the above embodiments, with the plurality of battery cell units mounted in the outer case.

[0029] Alternatively, in some embodiments of the present application, the battery pack includes a sampling component connected to the electrode terminal, and the projection of the notch and the projection of the sampling component are spaced apart along the first direction, thereby reducing the impact on the sampling component when pressure is released.

[0030] One embodiment of the present application provides an electrical device including the battery pack of any of the above embodiments.

[0031] In the battery cell unit, battery pack, and electrical device of the present application, the first portion covers part of the first connection portion, thereby increasing protection for the first sealing portion and improving the sealing of the battery cell. The first region is located within the cutout, the second segment is connected to the first segment, and the first region is located outside the second segment. This allows the pressure inside the battery cell to impact the second segment first when the battery cell expands, causing the second segment to protrude away from the first connection portion, and the pressure inside the battery cell to be released through the first region within the cutout. This facilitates pressure release and improves the safety of the battery cell unit. [Brief explanation of the drawings]

[0032] [Figure 1] FIG. 1 shows a schematic diagram of a battery cell unit according to some embodiments. [Figure 2] FIG. 2 is a partially enlarged schematic diagram of the battery cell unit in FIG. [Figure 3] FIG. 3 is a schematic configuration diagram of a battery cell unit observed along the second direction Y in FIG. [Figure 4] FIG. 4 is a schematic diagram of a battery cell unit observed from a direction Y' opposite to the second direction Y in FIG. [Figure 5] FIG. 5 is a schematic diagram of a battery cell unit according to another embodiment. [Figure 6] FIG. 6 is a schematic configuration diagram of the battery cell unit as viewed from a second direction Y in FIG. [Figure 7] FIG. 7 is a schematic diagram showing an enlarged portion of the battery cell unit in FIG. [Figure 8] FIG. 8 is a schematic diagram of the battery cell unit as viewed from a direction Y′ opposite to the second direction Y in FIG. [Figure 9] FIG. 9 is a schematic configuration diagram of the battery cell unit from another perspective of FIG. [Figure 10] FIG. 10 is a partially enlarged schematic view of FIG. [Figure 11] FIG. 11 is a schematic cross-sectional view taken along line AA in FIG. [Figure 12] FIG. 12 is a partially enlarged schematic view of FIG. [Figure 13] FIG. 13 is an enlarged schematic view showing another state of the second segment of FIG. [Figure 14] FIG. 14 is a schematic diagram of a battery cell according to some embodiments. [Figure 15] FIG. 15 is an exploded schematic view of the battery cell in FIG. [Figure 16] FIG. 16 is a schematic diagram of an electrode assembly according to some embodiments. [Figure 17] FIG. 17 is an exploded view of a battery pack according to some embodiments. [Figure 18] FIG. 18 is a schematic diagram of a portion of a battery pack according to some embodiments. [Figure 19] FIG. 19 is a schematic configuration diagram of a part of the battery pack from another viewpoint of FIG. [Figure 20] FIG. 20 is a schematic diagram of an elastic member according to some embodiments, observed from a direction X' opposite to the first direction X. [Figure 21] FIG. 21 is a schematic diagram of a portion of an exterior case according to some embodiments. [Figure 22] FIG. 22 is a schematic diagram of an electrical device according to some embodiments. DETAILED DESCRIPTION OF THE INVENTION

[0033] The present application will now be further described with reference to the drawings. The following specific embodiments are illustrative and not limiting. They are intended to provide a basic understanding of the present application, and are not intended to identify key or critical elements of the present application or to limit the scope of protection. As long as there is no structural conflict, the technical features proposed in each embodiment can be arbitrarily combined.

[0034] When a component is considered to be "mounted" on another component, it may be directly attached to the other component, or there may be intermediate elements. When a component is considered to be "connected" to another component, it may be directly connected to the other component, or there may be intermediate elements.

[0035] The terms "perpendicular" and "equal" refer to an ideal state between two parts. In actual manufacturing or use, two parts may be close to being perpendicular or equal. For example, based on numerical descriptions, "perpendicular" refers to an angle between two lines that is 90°±10°. "Perpendicular" also refers to an angle between two planes that is 90°±10°. "Perpendicular" also refers to an angle between a line and a plane that is 90°±10°. Two parts described as "perpendicular" may be nearly straight or flat, rather than being absolutely straight or flat. Macroscopically, a part is considered "straight" or "flat" if its overall extension direction is a straight or flat line.

[0036] The term "parallel" refers to an ideal state between two parts. In actual manufacturing or use, two parts may be close to being parallel. For example, based on numerical descriptions, "parallel" refers to an angle between two lines of 180°±10°. "Parallel" also refers to an angle between two planes of 180°±10°. "Parallel" also refers to an angle between a line and a plane of 180°±10°. Two parts described as "parallel" may be nearly straight or planar, rather than an absolute straight line or plane. Macroscopically, parts are considered "straight" or "planar" if their overall extension direction is straight or planar.

[0037] Unless otherwise defined, the term "plurality" as used herein when describing the number of parts specifically means two or more than two of the parts.

[0038] In the third direction Z, it includes the third direction Z and the direction opposite to the third direction Z, in the first direction X it includes the first direction X and the direction opposite to the first direction X, and in the second direction Y it includes the second direction Y and the direction opposite to the second direction Y.

[0039] For convenience of explanation, some of the electrode terminals 11c are not bent.

[0040] 1 to 15, one embodiment of the present invention provides a battery cell unit 10 having a battery cell 11 and a bracket 12 connected to the battery cell 11. The battery cell 11 includes a battery cell case 11a, an electrode assembly 11b, and an electrode terminal 11c that connects the electrode assembly 11b and extends from the battery cell case 11a. The battery cell case 11a includes a main body 111 and a first sealing portion 112, and the electrode assembly 11b is provided in the main body 111. The first sealing portion 112 includes a first connecting portion 112a, and the electrode terminal 11c extends from the first connecting portion out of the battery cell case 11a.

[0041] The bracket 12 includes a first portion 121, and the first portion 121 and the main body portion 111 are aligned along the first direction X. The first portion 121 covers a portion of the first connecting portion 112a, and the electrode terminal 11c extends from the first portion 121. The first connecting portion 112a includes a first end surface 1121, and the first end surface 1121 includes a first region 1211a. The first portion 121 includes a first segment 121a and a second segment 121b, and the first segment 121a covers a portion of the first end surface 1121 and a portion of the outer surface of the first connecting portion, and the second segment 121b is connected to the first segment 121a, and the first segment 1121a is located outside the second segment 121b. When observed along the second direction Y, the first segment 121a and the second segment 121b form a cutout 12a spaced apart from the main body 111, and the first region 1121a is located within the cutout 12a. The first direction X is perpendicular to the second direction Y.

[0042] The first portion 121 of the present application covers a portion of the first connection portion 112a, providing increased protection for the first sealing portion 11 and improving the sealing of the battery cell 11. The first region 1121a is located within the cutout 12a, and the second segment 121b is connected to the first segment 121a. By positioning the first region 1121a outside the second segment 121b, when the battery cell 11 expands, the pressure inside the battery cell 11 can impact the second segment 121b first. This causes the second segment 121b to protrude away from the first connection portion 112a, and the pressure inside the battery cell 11 is released through the first region 1121a in the cutout 12a, which is advantageous for releasing pressure and improves the safety of the battery cell unit 10.

[0043] In some embodiments, when observed along the direction Y' opposite to the second direction Y, the first segment 121a and the second segment 121b form a notch 12a spaced apart from the main body 111, and the first region 1121a is located within the notch 12a. The first connection portion 112a can be pushed open in the second direction Y by the air pressure inside the battery cell case 11a, which is advantageous for releasing pressure.

[0044] In some embodiments, the second segment 121b is located between the first region 1121a and the main body 111 along the first direction X when viewed along the second direction Y, which is advantageous for depressurization.

[0045] In some embodiments, the second segment 121b extends beyond the first segment 121a in the first direction X, which is advantageous for depressurization.

[0046] 14 and 15, in some embodiments, the main body 111 has an accommodating space, and the main body 111 includes a first case 111a having a first recess 1111 and a second case 111b having a second recess 1112. The first case 111a is connected to the second case 111b to form the accommodating space. A portion of the electrode assembly 11b is provided in the first recess 1111 and a portion is provided in the second recess 1112. The circumferential side of the first case 111a extends outward to form a first extending edge 1113, and the circumferential side of the second case 111b extends outward to form a second extending edge 1114. When the first case 111a is connected to the second case 111b, the first extending edge 1113 and the second extending edge 1114 overlap and are sealed.

[0047] In some embodiments, the main body 111 has an accommodating space, and the main body 111 includes a first case 111a having a first recess 1111 and a flat second case 111b. The first case 111a is connected to the second case 111b to form the accommodating space. The electrode assembly 11b is disposed in the first recess 1111.

[0048] In some embodiments, the first extending edge 1113 and the second extending edge 1114 are overlapped and sealed to form two first sealing portions 112 and two second sealing portions 113. The two first sealing portions 112 are arranged along the first direction X, and the two second sealing portions 113 are arranged along the third direction Z, with one first sealing portion 112 connecting the two second sealing portions 113 and the other first sealing portion 112 connecting the two second sealing portions 113.

[0049] In some embodiments, the battery cell 11 has two electrode terminals 11c, one electrode terminal 11c extending from one first sealing portion 112 to the battery cell case 11a, and the other electrode terminal 11c extending from the other first sealing portion 112 to the battery cell case 11a.

[0050] In some embodiments, the main body 111 includes a first wall 111c, a second wall 111d, a third wall 111e, a fourth wall 111f, a fifth wall 111g, and a sixth wall 111h. The first wall 111c and the second wall 111d are aligned in a first direction X, with one first sealing portion 112 connected to the first wall 111c and the other first sealing portion 112 connected to the second wall 111d. The third wall 111e and the fourth wall 111f are aligned in a third direction Z, with one second sealing portion 113 connected to the third wall 111e and the other second sealing portion 113 connected to the fourth wall 111f. The fifth wall 111g and the sixth wall 111h are aligned in a second direction Y.

[0051] In some embodiments, the main body 111 includes two first walls 111c, two second walls 111d, and two first sealing portions 112. One first wall 111c connects the fifth wall 111g and the first sealing portion 112, and the other first wall 111c connects the sixth wall 111h and the first sealing portion 112. One second wall 111d connects the fifth wall 111g and the other first sealing portion 112, and the other second wall 111d connects the sixth wall 111h and the other first sealing portion 112. One electrode terminal 11c extends from one of the first sealing portions 112 through the battery cell case 11a, and the other electrode terminal 11c extends from the other first sealing portion 112 through the battery cell case 11a.

[0052] When observed along the first direction X, the two first walls 111c are located on opposite sides of the first sealing portion 112 in the second direction Y. When observed from the direction opposite to the first direction X, the two second walls 111d are located on opposite sides of the second sealing portion 113 in the third direction Z.

[0053] In some embodiments, the battery cell case 11a includes a protective layer, a metal layer, and a polymer layer stacked in this order. The protective layer protects the metal layer, reduces the risk of damage to the metal layer due to external forces, and slows the penetration of air from the external environment. The metal layer may be an aluminum foil layer or a steel foil layer. The polymer layer has a heat-melting property and can be used for package sealing. In some embodiments, the battery cell case 11a has a notch formed on the first end surface 1121, exposing the metal layer. In the present application, the first region 1121a is positioned outside the second segment 121b, and the first region 1121a can be used to detect whether the battery cell case 11a is damaged during injection.

[0054] 1 to 4, in some embodiments, the first segment 121a includes a first sub-segment 1211 and a second sub-segment 1212 spaced apart in the third direction Z. The second segment 121b connects the first sub-segment 1211 and the second sub-segment 1212, and the electrode terminal 11c protrudes from the second sub-segment 1212. The first sub-segment 1211, the second sub-segment 1212, and the second segment 121b form a notch 12a.

[0055] 5 to 8, in some embodiments, the first connection portion 112a includes two second segments 121b, and the first segment 121a and the second segment 121b form two notches 12a when observed along the second direction Y. In the third direction Z, the electrode terminal 11c is located between the two notches 12a.

[0056] In some embodiments, the first segment 121a includes a first sub-segment 1211, a second sub-segment 1212, and a third sub-segment 1213. The second sub-segment 1212 and the third sub-segment 1213 are spaced apart in the third direction Z, and the second sub-segment 1212 is located between the first sub-segment 1211 and the third sub-segment 1213. An electrode terminal 11c protrudes from the second sub-segment 1212. One second segment 121b connects the first sub-segment 1211 and the second sub-segment 1212, forming one notch 12a. The other second segment 121b connects the second sub-segment 1212 and the third sub-segment 1213, forming one notch 12a. When observed along the second direction Y, the electrode terminal 11c is located between the two notches 12a in the third direction Z. The first end surface 1121 includes a second region 1121b located within the other cutout 12a. Providing two cutouts 12a is more advantageous for releasing pressure, and the safety of the battery cell unit 10 can be further improved.

[0057] In some embodiments, the second segment 121b has a U-shape when viewed along the second direction Y.

[0058] In some embodiments, the cutout 12a has a U-shape when viewed along the second direction Y.

[0059] 10, 12, and 13, in some embodiments, the distance d1 between the second segment 121b and the main body 111 in the first direction X is smaller than the distance d2 between the first segment 121a and the main body 111. This allows the pressure inside the battery cell 11 to act on the second segment 121b first when the battery cell 11 expands, which is advantageous for releasing the pressure.

[0060] In some embodiments, the second segment 121b includes a first sub-segment 1214 and a second sub-segment 1215 provided on both sides of the first connection portion 112a in the second direction Y. When the battery cell 11 is not expanded, the first sub-segment 1214 and the second sub-segment 1215 are sandwiched on both sides of the first connection portion 112a so as to block a portion of the first connection portion 112a.

[0061] In some embodiments, the first sub-segment 1214 and the second sub-segment 1215 are arranged to expand in a direction away from the first connection portion 112a in response to the internal air pressure of the battery cell 11, and the internal air pressure of the battery cell 11 moves through the first connection portion 112a between the first sub-segment 1214 and the second sub-segment 1215 to the first connection portion 112a located within the notch 12a, and is then discharged to the external environment through the first region 1121a, thereby releasing the pressure.

[0062] Referring to FIG. 3, in some embodiments, in the first direction X, the distance H between the side of the second segment 121b away from the first segment 121a and the first segment 121a satisfies H≧2 mm, and the pressure inside the battery cell 11 acts on the first sub-segment 1214 and the second sub-segment 1215 first, causing the first sub-segment 1214 and the second sub-segment 1215 to expand, which is advantageous for depressurization.

[0063] 3 and 7, in some embodiments, when observed along the second direction Y, the width of the notch 12a along the third direction Z gradually decreases along the first direction X, which is advantageous for increasing the accommodation space of the notch 12a and allowing it to accommodate more of the first connection portion 112a and the first region 1121a, which is ultimately advantageous for depressurization and can improve the safety of the battery cell unit 10.

[0064] 1, 2, and 4, in some embodiments, the first sealing portion 112 has a first bent portion 112b and a second bent portion 112c, and the first connecting portion 112a connects the first bent portion 112b and the second bent portion 112c. The first bent portion 112b and the second bent portion 112c are spaced apart in the third direction Z.

[0065] In some embodiments, the bracket 12 includes a first side portion 122 and a second side portion 123, and the first portion 121 connects the first side portion 122 and the second side portion 123. The first side portion 122 and the second side portion 123 are spaced apart in the third direction Z. The first side portion 122 covers the first bent portion 112b, and the second side portion 123 covers the second bent portion 112c.

[0066] When observed along the second direction Y, a portion of the first connecting portion 112a is located between the main body 111 and the first portion 121 in the first direction X, and a portion of the first connecting portion 112a is located between the first side portion 122 and the second side portion 123 in the third direction Z. Covering a portion of the first sealing portion 112 with the bracket 12 increases protection for the first sealing portion 112, and providing a portion of the first connecting portion 112a between the main body 111 and the first portion 121 and between the first side portion 122 and the second side portion 123 provides an expansion space for the first sealing portion 112, which is advantageous for releasing pressure.

[0067] In some embodiments, the distance between the electrode terminal 11c and the notch 12a in the third direction Z is L1, specifically, the distance between the side of the electrode terminal 11c closer to the notch 12a and the side of the notch 12a closer to the electrode terminal 11c. The distance between the electrode terminal 11c and the first side 122 in the third direction Z is L2, specifically, the distance between the side of the electrode terminal 11c closer to the first side 122 and the side of the first side 122 farther from the electrode terminal 11c. By making L1<½L2, damage to the electrode terminal due to gas pressure leaking from the first region 1121a in the notch 12a is reduced, and the risk of affecting the connection of adjacent electrode terminals 11c is reduced.

[0068] In some embodiments, the distance L3 between the notch 12a and the electrode terminal 11c is shorter than the distance L4 between the notch 12a and the first side portion 122, which increases the amount of heat generated at the electrode terminal 11c and is more advantageous for pressure relief.

[0069] In some embodiments, the bracket 12 includes a second portion 124 that covers a portion of the first wall 111c and protects the main body 111. The first portion 121 has one end connected to the first side portion 122 and the other end connected to the second side portion 123, and the second portion 124 has one end connected to the first side portion 122 and the other end connected to the second side portion 123, which can further increase the structural strength of the bracket 12 and is also advantageous for protecting the first sealing portion 112. The second portion 124 and the second segment 121b are spaced apart.

[0070] In some embodiments, when observed along the second direction Y, the second portion 124, the first portion 121, the first side portion 122, and the second side portion 123 surround each other to form a first space, and a portion of the first connection portion 112a is located in the first space 12b. The first portion 121, the first side portion 122, the second side portion 123, and the second portion 124 protect the periphery of the first connection portion 112a, thereby reducing the impact of expansion of the battery cell 11 on the sealing performance of the first sealing portion 112.

[0071] In some embodiments, when viewed along the second direction Y, the first space 12b is a closed space, which is advantageous for depressurizing the battery cell 11.

[0072] In some embodiments, when viewed along the second direction Y, the first connection portion 112a includes a first connection region 112a1 to which the first end face 1121 is connected and which is located within the notch 12a, which is advantageous for improving pressure relief of the battery cell 11.

[0073] In some embodiments, when viewed along the second direction Y, the first connection portion 112a includes a second connection region 112a2 located within the first space 12b, and the first connection region 112a1 and the second connection region 112a2 are spaced apart, which is advantageous for improving pressure relief of the battery cell 11.

[0074] In some embodiments, when viewed along the second direction Y, the first connection portion 112a includes a second connection region 112a2 located within the first space 12b, and the first connection region 112a1 and the second connection region 112a2 are spaced apart, which is advantageous for improving pressure relief of the battery cell 11.

[0075] In some embodiments, when observed along the first direction X, the second portion 124 located between the fifth wall 111g and the sixth wall 111h does not protrude from the main body 111 in the second direction Y. The second portion 124 does not protrude from the fifth wall 111g in the second direction Y. The second portion 124 does not protrude from the sixth wall 111h in the second direction Y. When adjacent battery cell cases 11a come into contact and are connected, a gap is formed between the adjacent second portions 124, which reduces the effect of pressure applied between the adjacent battery cell cases 11a on the second portion 124 and reduces the biasing force on the first sealing portion 112, which is advantageous for protecting the first sealing portion 112 and stably connecting the battery cells 11 with the bracket 12.

[0076] In some embodiments, when observed along the first direction X, the first side portion 122 does not protrude from the main body portion 111 in the second direction Y, and the second side portion 123 does not protrude from the main body portion 111. When adjacent battery cell cases 11a come into contact and are connected, a gap exists between adjacent first side portions 122 and a gap exists between adjacent second side portions 123, which reduces the influence of pressure mutually applied between the adjacent battery cell cases 11a on the first side portions 122 and the second side portions 123 and reduces the biasing force on the first sealing portion 112, which is advantageous for protecting the first sealing portion 112 and stably connecting the battery cells 11 with the bracket 12.

[0077] 12 , in some embodiments, the electrode assembly 11b has a wound structure, and the electrode assembly 11b includes a first straight segment 1115, a second straight segment 1116, a first curved segment 1117, and a second curved segment 1118. The first straight segment 1115 connects the first curved segment 1117 and the second curved segment 1118, and the second straight segment 1116 connects the first curved segment 1117 and the second curved segment 1118. Along the third direction Z, the projection of the fifth wall 111g covers the projection of the first straight segment 1115, the projection of the sixth wall 111h covers the projection of the first straight segment 1115, the projection of the fifth wall 111g covers the projection of the second straight segment 1116, and the projection of the sixth wall 111h covers the projection of the second straight segment 1116, which is advantageous for applying pressure uniformly between the battery cells 11 and further improving the lifespan of the battery cells 11.

[0078] In some embodiments, along the third direction Z, the projection of the first side portion 122 and the projection of the first curved segment 1117 overlap, the projection of the first side portion 122 and the projection of the first straight segment 1115 are spaced apart, and the projection of the first side portion 122 and the projection of the second straight segment 1116 are spaced apart, which is advantageous for depressurizing the battery cell 11.

[0079] In some embodiments, along the third direction Z, the projection of the second side portion 123 and the projection of the second curved segment 1118 overlap, the projection of the second side portion 123 and the projection of the first straight segment 1115 are spaced apart, and the projection of the second side portion 123 and the projection of the second straight segment 1116 are spaced apart, which is advantageous for depressurizing the battery cell 11.

[0080] 1 , in some embodiments, the bracket 12 includes a first extension 125 extending from the first side 122, and the first extension 125 covers at least a portion of the third wall 111e. The first extension 125 protects the third wall 111e and the second sealing portion 113, and can increase the connection strength between the bracket 12 and the battery cell 11.

[0081] In some embodiments, the bracket 12 includes a second extension 126 extending from the second side 123, and the second extension 126 covers at least a portion of the fourth wall 111f. The second extension 126 protects the fourth wall 111f and the second sealing portion 113, and can increase the connection strength between the bracket 12 and the battery cell 11.

[0082] In some embodiments, the bracket 12 is integrally molded with the battery cell 11, which is advantageous in improving the connection strength between the bracket 12 and the battery cell 11. The bracket 12 may be integrally molded by low-pressure injection molding.

[0083] In some embodiments, the bracket 12 is an insulating bracket, which can reduce the risk of short circuiting with the battery cell 11.

[0084] In some embodiments, the battery cell unit 10 includes two brackets 12, one bracket 12 connecting a portion of the first sealing portion 112, and the other bracket 12 connecting a portion of the other first sealing portion 112. One electrode terminal 11c extends from the first sealing portion 112 and the bracket 12 along the first direction X, and the other electrode terminal 11c extends from the second sealing portion 113 and the bracket 12 along the direction opposite to the first direction X.

[0085] In some embodiments, the electrode terminals 11c located on the same side of two adjacent battery cell units 10 are connected to each other, and of the two adjacent brackets 12, the bracket 12 of one battery cell unit 10 has a notch 12a, while the bracket 12 of the other battery cell unit 10 does not have a notch 12a.

[0086] In some embodiments, the electrode terminals 11c located on the same side of two adjacent battery units 10 are connected to each other, and the two adjacent brackets 12 are both provided with the notches 12a.

[0087] 18 to 21, a battery pack 100 according to one embodiment of the present invention includes a plurality of battery units 10 arranged in the second direction Y, and an exterior case 20 in which the plurality of battery units 10 are disposed.

[0088] In some embodiments, when the battery unit 10 is installed within the exterior case 20, it is in a pressurized state.

[0089] In some embodiments, it is advantageous for the body portions 111 of adjacent battery cell cases 11a to be in contact and connected, and for the body portions 111 to be pressurized.

[0090] In some embodiments, there is pressure between the body portions 111 of adjacent battery cell cases 11a, causing the plurality of battery cells 10 to be pressurized, which is advantageous for improving the lifespan of the battery cell unit 10.

[0091] In some embodiments, when observed along the first direction X, the first portion 121 is located between the fifth wall 111g and the sixth wall 111h in the second direction Y. A first gap 12c exists between the first portions 121 of adjacent battery cells 11, and adjacent brackets 12 are spaced apart by the first gap 12c. When pressure is applied to the main bodies 111 of adjacent battery cells 11, the force received by the first sealing portion 112 is reduced, and protection of the first sealing portion 112 is improved.

[0092] In some embodiments, when observed along the first direction X, the first side portions 122 do not extend beyond the first extension portions 125 in the third direction Z, and a second gap 12d is formed between adjacent first side portions 122. When adjacent battery cell cases 11a are in contact with each other and connected and pressure is applied to each other, the second gap 12d between the two adjacent first side portions 122 can reduce the biasing force received by the first side portions 122, thereby reducing the biasing force received by the first sealing portion 112 and advantageously protecting the first sealing portion 112.

[0093] In some embodiments, when observed along the first direction X, the second side portions 123 do not extend beyond the second extension portions 126 in the direction opposite to the third direction Z, and a third gap 12e is formed between adjacent second side portions 123. When adjacent battery cell cases 11a are in contact with each other and connected and apply pressure to each other, the third gap 12e between the two adjacent second side portions 123 can reduce the biasing force received by the second side portions 123, and thus the biasing force received by the first sealing portion 112 can be reduced, which is more advantageous for protecting the first sealing portion 112.

[0094] 13 to 17, in some embodiments, the battery pack 100 further includes an elastic member 30 interposed between the battery cells 10 and the outer case 20, and the elastic member 30 applies pressure to the plurality of battery cells 10, causing the plurality of battery cells 10 to be in a pressurized state.

[0095] In some embodiments, the exterior case 20 includes a left wall 21, a right wall 22, a front wall 23, a rear wall 24, a top wall 25, and a bottom wall 26. The left wall 21 and the right wall 22 are aligned in a second direction Y, the front wall 23 and the rear wall 24 are aligned in a first direction X, and the bottom wall 26 and the top wall 25 are aligned in a third direction Z. The left wall 21 connects the front wall 23, the rear wall 24, the top wall 25, and the bottom wall 26, and the right wall 22 connects the front wall 23, the rear wall 24, the top wall 25, and the bottom wall 26 to form a storage space, in which the multiple battery cell units 10 and the elastic member 30 are disposed. The multiple battery cells 10 and the elastic member 30 are aligned in the second direction Y.

[0096] In some embodiments, the bottom wall 26 is provided with a first stopper portion 261 extending in the second direction Y and a second stopper portion 262 extending in the second direction Y. The first stopper portion 261 and the second stopper portion 262 are arranged side by side in the first direction X. The first stopper portion 261 and the second stopper portion 262 are protruding from the bottom wall 26 along the third direction Z. When the bracket 12 is installed inside the outer case 20, the bracket 12 is positioned between the first stopper portion 261 and the second stopper portion 262. When the battery cell 11 expands, the first stopper portion 261 and the second stopper portion 262 can restrict movement of the bracket 12 in the first direction X, which is advantageous for movement of the bracket 12 in the second direction Y.

[0097] In some embodiments, the top wall 25 is provided with a third stopper portion 251 extending in the second direction Y and a fourth stopper portion 252 extending in the second direction Y. The third stopper portion 251 and the fourth stopper portion 252 are provided side by side in the first direction X. The first stopper portion 261 and the third stopper portion 251 are provided along the third direction Z, and the second stopper portion 262 and the fourth stopper portion 252 are provided along the third direction Z. The third stopper portion 251 and the fourth stopper portion 252 are provided on the surface of the top wall 25 facing the bottom wall 26, protruding in the direction opposite to the third direction Z. When the bracket 12 is provided inside the outer case 20, the bracket 12 is located between the third stopper portion 251 and the fourth stopper portion 252. When the battery cell 11 expands, the third stopper portion 251 and the fourth stopper portion 252 can restrict movement of the bracket 12 in the first direction X, which is advantageous for movement of the bracket 12 in the second direction Y.

[0098] In some embodiments, the elastic member 30 includes a base 31 and a bent portion 32, the base 31 connects the bent portion 32, and the bent portion 32 fixedly connects the outer case 20. The base 31 is arranged so as to be able to apply pressure to the battery cell unit 10, and the bent portion 32 is arranged so as to provide an expansion space for the battery cell unit 10.

[0099] In some embodiments, when the battery cells 11 are not expanded, the elastic member 30 does not apply pressure to the battery cell unit 10, and when the battery cells 11 are expanded, the elastic member 30 applies pressure to the battery cells 11.

[0100] In some embodiments, when the battery cell 11 is not expanded, the elastic member 30 applies a pressure to the battery cell 11, and when the battery cell 11 is expanded, the elastic member 30 applies a greater pressure to the battery cell 11.

[0101] In some embodiments, the base 31 is connected to the main body 111 of the outermost battery cell 11. The base 31 is provided with a plurality of protrusions 311 spaced apart in the first direction X, and the protrusions 311 are recessed away from the main body 111 on the side of the base 31 facing the main body 111, thereby increasing the structural strength of the base 31 and reducing the risk of deformation of the base 31 due to uneven force applied to the base 31.

[0102] In some embodiments, the folding portion 32 includes a first folding portion 321 and a second folding portion 322 aligned in a direction opposite to the third direction Z, with the first folding portion 321 connecting one side of the base 31 and the second folding portion 322 connecting the other side of the base 31. The first folding portion 321 and the second folding portion 322 can act on the battery cell unit 10 via the base 31, and the first folding portion 321 and the second folding portion 322 can provide expansion space for the battery cell unit 10.

[0103] In some embodiments, the elastic member 30 includes a first connection segment 323 that connects the side of the first bending portion 321 that is away from the base portion 31, and the first connection segment 323 is fixed to the outer case 20, and the first bending portion 321 is fixed to the outer case 20 via the first connection segment 323, so that the biasing force received by the bending portion 32 can be transmitted to the outer case 20.

[0104] In some embodiments, the first connecting segment 323 is parallel to the base 31 and favors deformation of the elastic member 30 in the second direction Y.

[0105] In some embodiments, the elastic member 30 includes a second connecting segment 324 connecting one side of the second bent portion 322 that is away from the base portion 31, the second connecting segment 324 being fixed to the outer case 20, and the second bent portion 322 being fixed to the outer case 20 via the second connecting segment 324, so that the biasing force received by the bent portion 32 can be transmitted to the outer case 20. For example, the fixing may be by welding, adhesive fixing, abutting fixing, fastening fixing, screw fixing, etc.

[0106] In some embodiments, the second connecting segment 324 is parallel to the base 31 to favor deformation of the elastic member 30 in the second direction Y.

[0107] In some embodiments, the top wall 25 is provided with a first fixing portion (not shown), and along the second direction Y, the projection of the first connection segment 323 overlaps the projection of the first fixing portion, and the first connection segment 323 is fixed to the first fixing portion.

[0108] In some embodiments, the bottom wall 26 is provided with a second fixing portion 263, and a projection of the first connecting segment 323 overlaps a projection of the second fixing portion 263 along the second direction Y, and the first connecting segment 323 is fixed to the second fixing portion 263 by, for example, welding, adhesive, abutting, fastening, or screwing.

[0109] In some embodiments, the structural strength of the top wall 25 is greater than the structural strength of the elastic member 30, reducing the risk that the top wall 25 will be deformed by the biasing force applied to the first bent portion 321.

[0110] In some embodiments, the structural strength of the bottom wall 26 is greater than the structural strength of the elastic member 30, reducing the risk of the bottom wall 26 being deformed by the biasing force applied to the first bent portion 321.

[0111] In some embodiments, the thickness of the top wall 25 is greater than the thickness of the largest of the base 31, the first bent portion 321, and the first connecting segment 323, improving the structural strength of the top wall 25 and reducing the risk of the top wall 25 being deformed by the biasing force applied to the first bent portion 321.

[0112] In some embodiments, the thickness of the bottom wall 26 is greater than the thickness of the largest of the base 31, the first bent portion 321, and the first connecting segment 323, thereby improving the structural strength of the bottom wall 26 and reducing the risk of deformation of the bottom wall 26 due to the biasing force applied to the first bent portion 321.

[0113] In some embodiments, the first bending portion 321 includes a first bending segment 321a connecting the base 31 and a second bending segment 321b connecting the first bending segment 321a and the first connecting segment 323. The first bending section 321a and the base 31 form a first included angle A1, the second bending section 321b and the first connecting segment 323 form a second included angle B1, and the first bending section 321a and the second bending section 321b form a third included angle C1, where A1≧B1 is satisfied, which increases the deformation resistance of the first bending section 321a and is advantageous for reducing the risk of deformation of the elastic member 30 in the second direction Y.

[0114] In some embodiments, C1>A1, which is advantageous for improving the uniform deformation of the first bent portion 321.

[0115] In some embodiments, C1=2B1=2A1, which is advantageous for further improving the uniform deformation of the first bent portion 321.

[0116] In some embodiments, the second bent portion 322 includes a third bent segment 322a and a fourth bent segment 322b, where the third bent segment 322a connects the base portion 31 and the fourth bent segment 322b connects the third bent segment 322a to the second connecting segment 324. The third bent segment 322a and the base portion 31 form a first included angle A2, the fourth bent segment 322b and the second connecting segment 324 form a second included angle B2, and the third bent segment 322a and the fourth bent segment 322b form a third included angle C2, where A2≧B2 increases the deformation resistance of the third bent segment 322a and is advantageous in reducing the risk of deformation of the elastic member 30 in the second direction Y.

[0117] In some embodiments, C2>A2, which is advantageous for improving the uniform deformation of the first bent portion 321.

[0118] In some embodiments, C2=2B2=2A2, which is advantageous for improving the uniform deformation of the first bent portion 321.

[0119] In some embodiments, the first bent portion 321 and the second bent portion 322 have the same configuration, which is advantageous for uniformly receiving force and uniformly deforming.

[0120] Alternatively, the second bent portion 322 is provided at the same angle as the first bent portion 321. When a force is applied to the first bent portion 321 and the second bent portion 322, the force is applied evenly and the first bent portion 321 and the second bent portion 322 are deformed evenly, reducing the risk of rotation of the elastic member 30 due to uneven deformation. Alternatively, A1=A2, B1=B2, and C1=C2.

[0121] Referring to FIG. 1 , in some embodiments, the battery pack 100 has a circuit board 50 between the elastic member 30 and the right wall 22. The circuit board 50 is connected to the sampling assembly 40 and can receive data collected by the sampling assembly 40. The circuit board 50 includes a BMS (Battery Management System) assembly, which includes multiple electronic components that perform functions such as control, protection, communication, power calculation, signal transmission, and power transmission of the battery cells 11. Alternatively, the circuit board 50 includes a flexible printed circuit (FPC). Alternatively, the circuit board 50 includes a printed circuit board (PCB), which has multiple leads (not shown) provided thereon.

[0122] In some embodiments, the battery pack 100 includes a sampling assembly 40 that connects either of the electrode terminals 11c of two adjacent battery cells 11 that are flex-connected, and the sampling assembly 40 is capable of collecting at least one of the voltage, current, and temperature of the battery cell 11.

[0123] In some embodiments, the sampling assembly 40 includes a sampling component 41 and a sampling line 42 that connects the sampling component 41 to the circuit board 50, and the sampling line 42 connects one of the electrode terminals 11c of two adjacent battery cells 11 that are bent and connected. Alternatively, the sampling component 41 is connected to the electrode terminal 11c by welding. The projection of the sampling component 41 and the projection of the notch 12a are spaced apart along the first direction X, which reduces the impact on the sampling component 41 during pressure release.

[0124] 22 , the present application also provides an electric device 200 using the above-described battery pack 100. In one embodiment, the electric device 200 of the present application is, but is not limited to, a drone, a backup power supply, an electric vehicle, an electric motorcycle, an electrically assisted bicycle, a power tool, a large-scale home battery pack, or the like.

[0125] The above examples are provided to illustrate the present application, but are not intended to limit the present application. If they fall within the substantial spirit of the present application, they will be included within the disclosure of the present application. [Explanation of symbols]

[0126] 100 battery packs 10 Battery cell unit 11 Battery Cells 11a battery cell case 11b Electrode assembly 11c electrode terminal 111 Main body 111a Case 1 111b Case 2 111c 1st wall 111d 2nd wall 111e 3rd wall 111f 4th wall 111g 5th wall 111h 6th wall 1111 First recess 1112 Second recess 1113 1st extension side 1114 2nd extension side 1115 First straight segment 1116 Second straight segment 1117 First curved segment 1118 Second curved segment 112 first sealing portion 112a First connection part 112a1 First connection area 112a2 Second connection area 1121 1st end face 1121a 1st area 1121b Second area 112b First bending portion 112c Second bending part 113 Second sealing portion 12 Bracket 12a Notch 12b 1st space 12c First gap 12d Second gap 12e Third Gap 121 Part 1 121a 1st segment 1211 1st sub-segment 1212 Second sub-segment 1213 3rd sub-segment 121b Second Segment 1214 1st sub-segment 1215 Second sub-segment 122 First side 123 Second Side 124 Part 2 124 1st extension part 126 Second extension part 20 outer case 21 Left Wall 22 Right wall 23 Front wall 24 Back wall 25 Ceiling wall 251 Third stopper part 252 4th stopper part 26 Bottom wall 261 First stopper part 262 Second stopper part 263 Second fixed part 30 Elastic member 31 Base 32 Bending section 321 First bending part 321a First bending segment 321b Second bending segment 322 Second bending part 322a Third bending segment 322b Fourth bend segment 323 First connecting segment 324 Second Connection Segment 40 Sampling Assembly 41 Sampling Parts 42 Sampling Line 50 Circuit Board 200 Electrical Equipment X, first direction Y 2nd direction Z, direction 3

Claims

1. A battery cell unit, the battery cell unit including a battery cell and a bracket, the battery cell includes an electrode assembly, a battery cell case, and an electrode terminal, the electrode terminal being connected to the electrode assembly and extending from the battery cell case; the battery cell case includes a main body portion and a first sealing portion, the electrode assembly is provided in the main body portion, the first sealing portion includes a first connection portion, and the electrode terminal extends from the first connection portion through the battery cell case; the bracket includes a first portion, the first portion and the main body portion are aligned along a first direction, the first portion covers a part of the first connection portion, and the electrode terminal protrudes from the first portion; the first connection portion includes a first end surface, and the first end surface includes a first region; the first portion includes a first segment and a second segment, the first segment covering a part of the first end surface and a part of an outer surface of the first connection portion, the second segment being connected to the first segment, and the first region being located outside the second segment; When viewed along a second direction, the first segment and the second segment form a notch, the notch is spaced from the main body portion, and the first region is located within the notch; the second segment includes a second first sub-segment and a second second sub-segment, and the second first sub-segment and the second second sub-segment are provided on both sides of the first connection portion along the second direction; The battery cell unit, wherein the first direction is perpendicular to the second direction.

2. 2. The battery cell unit of claim 1, wherein the first segment includes a first first sub-segment and a first second sub-segment, the first first sub-segment and the first second sub-segment being arranged at an interval along a third direction, the second segment connecting the first first sub-segment and the first second sub-segment, the electrode terminal protruding from the first second sub-segment, and the first direction, the second direction, and the third direction being perpendicular to each other.

3. The battery cell unit according to claim 1 , wherein, when viewed along the second direction, the second segment is provided between the first region and the main body portion along the first direction.

4. the first sealing portion includes a first bent portion and a second bent portion, the first connection portion connects the first bent portion and the second bent portion, and the first bent portion and the second bent portion are spaced apart from each other along the third direction, 3. The battery cell unit of claim 2, wherein the bracket includes a first side portion and a second side portion aligned along the third direction, the first portion connecting the first side portion and the second side portion, the first side portion covering the first bent portion, and the second side portion covering the second bent portion, and when observed along the second direction, a portion of the first connection portion is located between the first side portion and the second side portion in the third direction.

5. The distance between the electrode terminal and the notch along the third direction is L １ and the distance between the electrode terminal and the first side portion is L ２ and L １ <1 / 2L ２ 5. The battery cell unit according to claim 4, wherein:

6. 2. The battery cell unit according to claim 1, wherein the second first sub-segment and the second second sub-segment are arranged such that, when subjected to pressure inside the battery cell, the second first sub-segment and the second second sub-segment protrude in a direction away from the first connection portion.

7. 3. The battery cell unit according to claim 2, wherein the first connection portion includes two second segments, and when observed along the second direction, the first segment and the second segment form two notches, and in the third direction, the electrode terminal is located between the two notches.

8. 3 . The battery cell unit according to claim 2 , wherein, when observed along the second direction, the width of the notch along the third direction gradually decreases along the first direction.

9. 5. The battery cell unit according to claim 4, wherein the main body portion includes a first wall, the first connection portion is connected to the first wall, and the bracket includes a second portion, the second portion covering a portion of the first wall.

10. 10. The battery cell unit of claim 9, wherein, when observed along the second direction, the second portion, the first portion, the first side portion, and the second side portion surround each other to form a first space, and a portion of the first connection portion is located within the first space.

11. The battery cell unit according to claim 10 , wherein the first space is a closed space when viewed along the second direction.

12. The battery cell unit according to claim 1 , wherein the bracket includes an insulating bracket.

13. The battery cell unit according to any one of claims 1 to 11, wherein the bracket is integrally molded with the battery cell.

14. 12. The battery cell unit according to claim 1, wherein, when observed along the second direction, the first connection portion includes a first connection region that connects the first end surface and is located within the cutout.

15. The battery cell unit according to claim 1 , wherein the second segment is U-shaped.

16. The battery cell unit according to claim 1 , wherein the second segment extends beyond the first segment in the first direction.

17. 12. The battery cell unit of claim 1, wherein when observed along a direction opposite to the second direction, the first segment and the second segment form a notch, the notch being spaced apart from the main body portion, and the first region being located within the notch.

18. 12. The battery cell unit according to claim 1, wherein a distance H between the second segment and the first segment in the first direction satisfies H≧2 mm.

19. A battery pack including an outer case, 12. A battery pack, wherein the battery cell unit further includes a plurality of battery cell units according to claim 1, and the plurality of battery cell units are provided in the exterior case.

20. 20. The battery pack of claim 19, wherein the battery pack includes a sampling component connected to the electrode terminal, and a projection of the notch and a projection of the sampling component are spaced apart along the first direction.

21. An electrical device comprising the battery pack according to claim 19.

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