Battery pack and electric equipment

Abstract

The embodiment of the utility model discloses a battery pack and electric equipment. The battery pack comprises a box body, a plurality of single batteries, a first protection part and a first adhesive layer, the box body is provided with a containing cavity and a first inner wall located in the containing cavity, the multiple single batteries are contained in the containing cavity, a gap is formed between every two adjacent single batteries, and each single battery is provided with a first surface facing the first inner wall; the first protection piece is arranged on the first surfaces of the two adjacent single batteries and seals a gap between the two adjacent single batteries; the first adhesive layer is arranged between the first inner wall and the first surface and between the first inner wall and the first protection piece. According to the embodiment of the invention, the gap is sealed by the protective part, the first adhesive layer is prevented from entering the gap, and the first adhesive layer is completely filled between the first inner wall of the box body and the first surfaces of the plurality of single batteries, so that the thickness of the first adhesive layer is more controllable.

Description

Technical Field

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

[0002] During the assembly of the battery pack, a glue layer is first applied to the first inner wall of the box body, and then a plurality of single cells are placed in the box body as a whole, and the bottom surface of the single cell is bonded to the first inner wall of the box body through the glue layer, thereby fixing the position of the single cell.

[0003] In a battery pack, a gap is usually provided between adjacent cells to dissipate heat from the cells. During the assembly process, part of the glue layer enters the gap, causing the thickness of the glue layer to be uncontrollable. Utility Model Content

[0004] The embodiments of the present application provide a battery pack and an electrical device, which prevent the glue layer from entering the gap between adjacent single cells and improve the yield of battery assembly.

[0005] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions: In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0006] On the one hand, a battery pack is provided, which includes a box, a plurality of single cells, a first protective member, and a first adhesive layer. The box has a receiving cavity and a first inner wall located in the receiving cavity, a plurality of single cells are received in the receiving cavity, a gap is provided between two adjacent single cells, and each single cell has a first surface facing the first inner wall; the first protective member is provided on the first surface of two adjacent single cells and closes the gap between the two adjacent single cells; the first adhesive layer is provided between the first inner wall and the first surface, and between the first inner wall and the first protective member; wherein the area of ​​the first surface of the single cell is S1, the orthographic projection area of ​​the first protective member on the first surface of the single cell is Sa, and 1%<Sa / S1<25%.

[0007] In addition to or as an alternative to one or more of the features disclosed above, the box body has a third direction, the box body has a second inner wall located in the accommodating cavity, the gap extends along the third direction, the second inner wall and the first inner wall are arranged opposite to each other along the third direction, and the plurality of single cells also have a second surface facing the second inner wall. The battery pack also includes a second protective member and a second adhesive layer. The second protective member is arranged on the second surface of two adjacent single cells and closes the gap between the two adjacent single cells; the second adhesive layer is arranged between the second inner wall and the second surface, and between the second inner wall and the second protective member; wherein the area of ​​the second surface of the single cell is S2, and the orthographic projection area of ​​the second protective member on the second surface of the single cell is Sc, 1%<Sc / S2<25%.

[0008] In addition to one or more of the features disclosed above, or as an alternative, multiple single cells are arranged in multiple rows and columns, and the gap includes a first gap formed along a first direction and a second gap formed along a second direction; the first protective member includes a plurality of first protective components extending along the first direction and a second protective component extending along the second direction, wherein the first protective component covers the first gap and the second protective component covers the second gap; the first direction, the second direction and the third direction intersect with each other, the first direction is the length direction of the single cell, the second direction is the width direction of the single cell, and the third direction is the height direction of the single cell.

[0009] In addition to or as an alternative to one or more of the features disclosed above, the first guarding component and the second guarding component are an integrally formed grid-like structure that is interconnected.

[0010] In addition to or as an alternative to one or more of the features disclosed above, the thickness of the first protective member is t mm, satisfying: 0.1<t<0.3.

[0011] In addition to or instead of one or more of the features disclosed above, the battery pack further comprises a third adhesive layer, the third adhesive layer being adhered to the first surface and a side of the first protective member facing the first surface, and / or the third adhesive layer being adhered to the second surface and a side of the second protective member facing the second surface.

[0012] In addition to or as an alternative to one or more of the features disclosed above, the first surface includes a first connecting surface and a second connecting surface, the first protective member is connected to the first connecting surface, the first adhesive layer covers a side of the first protective member facing away from the single cell and is connected to the second connecting surface, and / or the second surface includes a third connecting surface and a fourth connecting surface, the second protective member is connected to the third connecting surface, and the second adhesive layer covers a side of the second protective member facing away from the single cell and is connected to the fourth connecting surface.

[0013] In addition to or as an alternative to one or more of the features disclosed above, the battery pack further includes a limiting member, which is protruding from a side of the first protective member facing the first adhesive layer and is embedded in the first adhesive layer.

[0014] In addition to or as an alternative to one or more of the features disclosed above, the first protective member has a through hole, and the first adhesive layer is penetrated through the through hole and bonded to the first surface.

[0015] In addition to or as an alternative to one or more of the features disclosed above, the battery pack further includes a separator, wherein the separator is embedded in the gap, and the separator is connected to the third adhesive layer.

[0016] In addition to or as an alternative to one or more of the features disclosed above, the battery pack includes a heat exchange member, which is disposed in the gap and connected to the surface of the single battery, and the isolation member abuts against the heat exchange member.

[0017] In addition to or as an alternative to one or more features disclosed above, multiple single cells are arranged in multiple rows and columns, several rows and columns of single cells form a battery group, the battery pack includes multiple battery groups, and each battery group is correspondingly provided with a first protective member.

[0018] On the other hand, an electrical device is provided, the electrical device comprising any of the above-mentioned battery packs.

[0019] One of the above technical solutions has the following advantages or beneficial effects:

[0020] In the embodiment of the present application, the single cell is bonded to the box body through the first adhesive layer. There is a gap between two adjacent single cells, and the gap is closed by the first protective member to prevent the first adhesive layer from entering the gap. When assembling the battery pack, the first adhesive layer is completely filled between the first inner wall of the box body and the first surfaces of the plurality of single cells, so that the thickness of the first adhesive layer is more controllable, thereby improving the assembly quality of the battery pack; at the same time, based on the area of ​​the first surface of the single cell being S1, the orthographic projection area of ​​the first protective member on the first surface of the single cell being Sa, which satisfies the relationship of 1%<Sa / S1<25%, and can well control the area ratio of the first protective member occupying the first surface, thereby ensuring that the first adhesive layer and the first surface have sufficient bonding area, thereby ensuring the bonding strength of the first adhesive layer to the single cell, thereby further improving the assembly quality of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0022] Figure 1 is a top view of an embodiment of a battery pack of the present application;

[0023] Figure 2 is a three-dimensional exploded view of an embodiment of a battery pack of the present application;

[0024] Figure 3 is a cross-sectional view of an embodiment of a battery pack of the present application;

[0025] Figure 4 It is a schematic diagram of the projection of the first protective member on the surfaces of two adjacent single cells in one embodiment of the battery pack of the present application;

[0026] Figure 5 It is a schematic diagram of the projection of the second protective member on the surfaces of two adjacent single cells in an embodiment of the battery pack of the present application;

[0027] Figure 6 It is a three-dimensional structural schematic diagram of a partial structure of an embodiment of a battery pack of the present application;

[0028] Figure 7 It is a schematic diagram of a state where a first protective member and a single battery are separated in an embodiment of a battery pack of the present application;

[0029] Figure 8 is a cross-sectional view of an embodiment of a battery pack of the present application;

[0030] Fig. 9 yes Figure 8 An enlarged view of the partial view H1 in FIG.

[0031] Fig.10 It is a three-dimensional structural schematic diagram of a partial structure of an embodiment of a battery pack of the present application;

[0032] Fig.11 yes Fig.10 A top view of a partial structure of the battery pack shown;

[0033] Fig.12 yes Fig.10 H2-H2 cross-sectional view in;

[0034] Fig.13 It is a three-dimensional structural schematic diagram of a partial structure of an embodiment of a battery pack of the present application;

[0035] Fig.14 yes Fig.13 H3-H3 sectional view in FIG.

[0036] Fig.15 It is a cross-sectional view of the local structure of an embodiment of the battery pack of the present application.

[0037] Description of reference numerals: 101-box; 103-accommodation chamber; 105 single battery; 106-battery pack; 107-pole; 108-explosion-proof valve; 111-first surface; 112-first connection surface; 113-second connection surface; 114-second surface; 115-first gap; 116-second gap; 117-gap; 118-third surface; 119-first protective component; 120-second protective component; 121-first Protective member; 123-first adhesive layer; 127-third adhesive layer; 128-second adhesive layer; 129-limiting member; 1331-first inner wall; 1332-second inner wall; 135-through hole; 139-heat exchange member; 141-third surface; 147-frame; 149-bottom plate; 151-top plate; 155-third connecting surface; 153-fourth connecting surface; 157-isolating member; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] See also Figures 1 to 3 . Figure 1 It is a top view of an embodiment of a battery pack of the present application. Figure 2It is a three-dimensional exploded view of an embodiment of the battery pack of the present application. Figure 3 It is a cross-sectional view of an embodiment of a battery pack of the present application.

[0043] For the convenience of introduction, the following definition is made: the battery pack has a first direction X, a second direction Y, and a third direction Z, any two of which are perpendicular to each other. In a usage scenario, the first direction X and the second direction Y are located in a horizontal plane, and the third direction Z is opposite to the direction of gravity.

[0044] In some embodiments, a battery pack includes a case 101, a plurality of single cells 105, a first adhesive layer 123, and a first protective member 121. The case 101 has a receiving cavity 103 and a first inner wall 1331 located in the receiving cavity 103. A plurality of single cells 105 are received in the receiving cavity 103. A gap 117 is provided between two adjacent single cells 105. Each single cell 105 has a first surface 111 facing the first inner wall 1331. The first protective member 121 is provided on the first surfaces 111 of two adjacent single cells 105, and closes the gap 117 between the two adjacent single cells 105. The first adhesive layer 123 is provided between the first inner wall 1331 and the first surface 111, and between the first inner wall 1331 and the first protective member 121, and is used to fix the single cells 105.

[0045] The box 101 is used as the structural body of the battery pack to install the remaining components of the battery pack. In some embodiments, the box 101 includes a top plate 151, a bottom plate 149 and a frame 147. The top plate 151 and the bottom plate 149 are spaced apart along the third direction Z. The frame 147 is sandwiched between the top plate 151 and the bottom plate 149. The top plate 151, the bottom plate 149 and the frame 147 are arranged to form the accommodating cavity 103. The first inner wall 1331 is located on the top plate 151 or the bottom plate 149. Specifically, in Figures 1 to 3 In the illustrated embodiment, the first inner wall 1331 is located on the side of the top plate 151 facing the bottom plate 149. In other embodiments, the first inner wall 1331 may also be located on the side of the bottom plate 149 facing the top plate 151. The specific structure of the box body 101 is not limited thereto.

[0046] In some embodiments, the single cell 105 is a secondary battery. A secondary battery refers to a battery that can be used continuously by activating the active material by charging after discharge. Generally, a secondary battery includes a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte. During the battery charge and discharge process, active ions are embedded and released back and forth between the positive electrode sheet and the negative electrode sheet. The separator is arranged between the positive electrode sheet and the negative electrode sheet to play an isolation role. The electrolyte plays the role of conducting ions between the positive electrode sheet and the negative electrode sheet.

[0047] The specific shape of the single battery 105 can be a square battery (such as Figures 1 to 3As shown in FIG. 1 , it can also be a cylindrical battery or a battery of other shapes. In the following, a square battery is taken as an example for introduction.

[0048] In some embodiments, the single cell 105 has a first surface 111, a second surface 114, and a third surface 118. The first surface 111 and the second surface 114 are disposed opposite to each other along the third direction Z, and the third surface 118 is connected between the first surface 111 and the second surface 114 and is disposed around the first surface 111 and the second surface 114. Specifically, the third surface 118 includes two large surfaces disposed opposite to each other and two side surfaces disposed opposite to each other, and the large surfaces and the side surfaces are alternately connected in the circumferential direction of the single cell 105. The first surface 111 faces the top plate 151, and the second surface 114 faces the bottom plate 149. A gap 117 is formed between the third surfaces 118 of two adjacent single cells 105.

[0049] In some embodiments, the first protection member 121 is made of insulating material.

[0050] In a battery pack assembly scenario, the process of assembling the battery pack is as follows:

[0051] In the embodiment of the present application, since the gap 117 is closed, during the assembly process, the glue forming the first glue layer 123 cannot enter the gap 117 and is entirely located between the first inner wall 1331 and the first surface 111. Thus, the thickness T1 of the first glue layer 123 is more controllable, and the uniformity of the thickness is also more controllable. The thickness T1 of the first glue layer 123 affects the bonding stability of the single battery 105.

[0052] Please also read Figure 4 . Figure 4 1 is a schematic diagram of the projection of the first protective member 121 on the surfaces of two adjacent single batteries 105 in an embodiment of the battery pack of the present application.

[0053] The area of ​​the first surface 111 of the single battery 105 is S1, and the orthographic projection area of ​​the first protection member 121 on the first surface 111 of the single battery 105 is Sa, which satisfies 1%<Sa / S1<25%.

[0054] The orthographic projection is a projection formed by taking the first surface 111 as the projection surface and the normal direction of the first surface 111 as the projection direction. Figure 4 In the figure, for easy distinction, the orthographic projection area of ​​the first protection member 121 on the first surface 111 of the single battery 105 is shown by hatching.

[0055] exist Figure 4In the embodiment shown, the orthographic projection areas formed by the first protection member 121 on the first surfaces 111 of two adjacent single cells 105 are equal. It should be noted that the equal projection areas of the two are only an example, and in some other embodiments, the areas of the two may be unequal.

[0056] Please continue reading Figures 1 to 3 In some embodiments, the box body 101 has a third direction Z, and the box body 101 has a second inner wall 1332 located in the accommodating cavity 103. The gap 117 extends along the third direction Z, the second inner wall 1332 and the first inner wall 1331 are arranged opposite to each other along the third direction Z, and the plurality of single cells 105 also have a second surface 114 facing the second inner wall 1332. The battery pack also includes a second protective member 125 and a second adhesive layer 128. The second protective member 125 is disposed on the second surface 114 of two adjacent single cells 105, and closes the gap 117 between the two adjacent single cells 105. The second adhesive layer 128 is disposed between the second inner wall 1332 and the second surface 114, and between the second inner wall 1332 and the second protective member 125.

[0057] Specifically, the first inner wall 1331 is located on the side of the top plate 151 facing the bottom plate 149, and the second inner wall 1332 is located on the side of the bottom plate 149 facing the top plate 151. In other embodiments, the second inner wall 1332 may be located on the side of the top plate 151 facing the bottom plate 149, and the first inner wall 1331 may be located on the side of the bottom plate 149 facing the top plate 151.

[0058] Both ends of the single battery 105 in the third direction Z are bonded to the case 101 , thereby further improving the firmness of the single battery 105 mounted on the case 101 .

[0059] Please also read Figure 5 . Figure 5 Schematic diagram of the projection of the second protective member 125 on the surfaces of two adjacent single batteries 105 in an embodiment of the battery pack of the present application.

[0060] The area of ​​the second surface 114 of the single battery 105 is S2, the orthographic projection area of ​​the second protection member 125 on the second surface 114 of the single battery 105 is Sc, and 1%<Sc / S2<25%.

[0061] The orthographic projection is a projection formed by taking the second surface 114 as the projection surface and the normal direction of the second surface 114 as the projection direction. Figure 5 In the figure, for easy distinction, the orthographic projection area of ​​the second protection member 125 on the second surface 114 of the single battery 105 is shown by hatching.

[0062] exist Figure 5In the illustrated embodiment, the orthographic projection areas formed by the second protection member 125 on the second surfaces 114 of two adjacent single cells 105 are equal. It should be noted that the equal projection areas of the two are only an example, and in some other embodiments, the areas of the two may be unequal.

[0063] For the convenience of description, the following definitions are made: Q1=Sa / S1, Q2=Sc / S2.

[0064] To verify the impact of the values ​​of Q1 and Q2 on the battery pack, the following test was performed.

[0065] The battery packs were produced using an automated assembly line. 100 samples were selected from each battery pack in each embodiment and each comparative example.

[0066] According to the content of 8.2.1 of GB 38031, the battery pack is subjected to random vibration test in the third direction Z, and then to fixed frequency vibration in the third direction Z; after completing the vibration test, it is kept still for 2 hours and the data is recorded. If the first adhesive layer 123 is cracked or the position of the first protective member 121 is displaced or misaligned, it is recorded as a defective product, otherwise it is recorded as a good product.

[0067] The measurement results of various embodiments and comparative examples are shown in the following table.

[0068] Table 1:

[0069] <![CDATA[Sa / mm 2 ]]> <![CDATA[S1 / mm 2 ]]> Q1 / ％ <![CDATA[Sc / mm 2 ]]> <![CDATA[S2 / mm 2 ]]> Q2 / ％ t / mm Sample yield Example 1 1101 6925.2 15.90 / / / 0.2 90％ Example 2 705 6925.2 10.18 / / / 0.2 100％ Example 3 870 6925.2 12.56 / 0.2 100％ Example 4 170 6925.2 2.45 / / / 0.2 60％ Example 5 70 6925.2 1.01 / / / 0.2 50％ Comparative Example 1 50 6925.2 0.72 / / / 0.2 45％ Comparative Example 2 2001 6925.2 28.89 / / / 0.2 35％ Example 6 1101 6925.2 15.90 1101 6925.2 / 0.2 90％ Example 7 1101 6925.2 15.90 702 6925.2 / 0.2 100％ Example 8 1101 6925.2 15.90 865 6925.2 15.90 0.2 100％ Example 9 1101 6925.2 15.90 165 6925.2 10.14 0.2 60％ Example 10 1101 6925.2 15.90 72 6925.2 12.49 0.2 50％ Embodiment 11 1101 6925.2 15.90 65 6925.2 2.38 0.2 30％ Example 12 1101 6925.2 15.90 1901 6925.2 1.04 0.2 45％ Embodiment 13 1101 6925.2 15.90 / / 0.94 0.10 90％ Embodiment 14 1101 6925.2 15.90 / / 27.45 0.30 100％ Embodiment 15 1101 6925.2 15.90 / / / 0.05 30％ Example 16 1101 6925.2 15.90 / / / 0.6 95％

[0070] As can be seen from Table 1, when the value of Q1 is too small, the overlap between the first protective member 121 and the first surface 111 is relatively small, and the first protective member 121 is prone to misalignment. When the value of Q1 is too large, the bonding area between the first adhesive layer 123 and the single battery 105 is relatively small, which reduces the firmness of the single battery 105 installed on the box 101, and the first adhesive layer 123 is prone to cracking. The value range of Q1 in the embodiment of the present application is relatively reasonable, so that the battery pack can meet the predetermined effect; when the value of Q2 is too small, the overlap between the first protective member 121 and the second surface 114 is relatively small, and the second protective member 125 is prone to misalignment. When the value of Q2 is too large, the bonding area between the second adhesive layer 128 and the single battery 105 is relatively small, which reduces the firmness of the single battery 105 installed on the box 101, and the second adhesive layer 128 is prone to cracking. The value range of Q2 in the embodiment of the present application is relatively reasonable, so that the battery pack can meet the predetermined effect.

[0071] Please also read Figure 6 . Figure 6 It is a three-dimensional structural schematic diagram of the local structure of an embodiment of the battery pack of the present application.

[0072] In some embodiments, the plurality of single cells 105 are arranged in multiple rows and columns, and the gap 117 includes a first gap 115 formed along a first direction X and a second gap 116 formed along a second direction Y. The first direction X, the second direction Y, and the third direction Z intersect each other. Specifically, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The first direction X is the length direction of the single cell 105, the second direction Y is the width direction of the single cell 105, and the third direction Z is the height direction of the single cell 105.

[0073] The first gap 115 and the second gap 116 have different sizes due to their different formation methods and functions. The details are as follows.

[0074] In some embodiments, the battery pack further includes a plurality of heat exchangers 139, which are sandwiched between two adjacent single cells 105. Along the third direction Z, the heat exchangers 139 have a height difference with the first surfaces 111 of the two adjacent single cells 105, that is, the height of the heat exchangers 139 is lower than the height of the first surface 111, so that a first gap 115 is formed between two adjacent single cells 105. Specifically, in some embodiments, the heat exchangers 139 are heat conductive members, such as some liquid cooling plates or heating plates, that is, the heat transfer efficiency of the heat exchangers 139 is high, for example, the heat exchangers 139 are made of aluminum or aluminum alloy. The heat exchangers 139 are in contact with the single cells 105 and can transfer heat, for example, the heat exchangers 139 transfer the heat of the single cells 105 to the outside to dissipate the heat of the single cells 105, or transfer the heat from the outside to the single cells 105 to heat the single cells 105.

[0075] In some embodiments, there is no object between the opposite surfaces of two adjacent single batteries 105 , thereby forming a gap 116 . In an application scenario, the gap 116 is used for air flow to dissipate heat from the single batteries 105 .

[0076] Please also read Figure 7 . Figure 7 It is a schematic diagram of a state where the first protective member 121 and the single battery 105 are separated in an embodiment of the battery pack of the present application.

[0077] In the case where the gap 117 includes a first gap 115 formed along the first direction X and a second gap 116 formed along the second direction Y, the first prevention member 121 may have the following structure.

[0078] In some embodiments, the first protection member 121 includes a plurality of first protection components 119 extending along the first direction X and second protection components 120 extending along the second direction Y, wherein the first protection components 119 cover the first gaps 115 and the second protection components 120 cover the second gaps 116 .

[0079] Furthermore, in some embodiments, the first protective component 119 and the second protective component 120 are an integrally formed grid-like structure connected to each other. Specifically, they can be integrally formed by injection molding. In an assembly scenario, the first protective component 121 is entirely covered on the gap 117, so that the assembly efficiency can be improved. In other embodiments, the first protective component 119 and the second protective component 120 are split structures. In an assembly scenario, the first protective component 119 is first covered on the first gap 115, and then the second protective component 120 is covered on the second gap 116. With this arrangement, each time the covering operation is performed, the action is simpler, and it is also convenient to improve the success rate of assembly.

[0080] In addition, when the battery pack has the second protective member 125 , the specific structure of the second protective member 125 may refer to the first protective member 121 , and will not be described in detail herein.

[0081] The specific manner in which the first protection member 121 closes the gap 117 is described below.

[0082] See also Figure 8 and Fig. 9 . Figure 8 It is a cross-sectional view of an embodiment of a battery pack of the present application. Fig. 9 yes Figure 8 An enlarged view of the partial view H1 in FIG.

[0083] Figure 8 In the illustrated embodiment, the pole 107 and the explosion-proof valve 108 of the single battery 105 are both arranged on one side of the second surface 114 , and the second surface 114 is spaced apart from the second inner wall 1332 (without the second adhesive layer 128 ), and the single battery 105 is bonded to the first inner wall 1331 through the first adhesive layer 123 .

[0084] In some embodiments, the first protective member 121 is connected to the first surfaces 111 of two adjacent single cells 105 and covers the gap 117. Specifically, the first protective member 121 is disposed along the third direction Z on the side of the single cell 105 facing the first inner wall 1331, and is respectively attached to the first surfaces 111 of the two adjacent single cells 105. The first protective member 121 overlaps the edge of the first surface 111 of one of the single cells 105 at the gap 117, and overlaps the edge of the first surface 111 of the other single cell 105 at the gap 117. Specifically, the first surface 111 includes a first connection surface 112 and a second connection surface 113. The first protective member 121 is connected to the first connection surface 112, and the first adhesive layer 123 covers the side of the first protective member 121 away from the single cell 105 and is connected to the second connection surface 113.

[0085] The first protection member 121 is connected to the first surface 111 , and can fix the position of the first protection member 121 to prevent the first protection member 121 from moving during the assembly of the battery pack.

[0086] When the first protection member 121 is attached to the surface of the single battery 105 , the following improvements are made to achieve the connection between the first protection member 121 and the single battery 105 .

[0087] In some embodiments, the battery pack further includes a third adhesive layer 127, and the third adhesive layer 127 is adhered to the first surface 111 and the side of the first protective member 121 facing the first surface 111. The materials of the first adhesive layer 123 and the third adhesive layer 127 may be the same or different. Due to different fixing objects, in some embodiments, the bonding strength of the third adhesive layer 127 is lower than the bonding strength of the first adhesive layer 123.

[0088] In some other embodiments, the battery pack further includes a fastener (not shown), which connects the first protective member 121 to the box structure of the battery pack, such as the box frame or the crossbeam or longitudinal beam of the box. Optionally, the fastener is a screw or a buckle.

[0089] In some other embodiments, the first protection member 121 is connected to the single battery 105 by magnetic adsorption.

[0090] The connection method between the first protection member 121 and the single battery 105 is not limited to the above example, and other reasonable connection methods are also possible.

[0091] In addition, when the battery pack has a second protective member 125, the second protective member 125 is bonded to the second surface 114 via a third adhesive layer 127. Figure 5 The second surface 114 includes a third connection surface 155 and a fourth connection surface 153. The second protective member 125 is connected to the third connection surface 155. The second adhesive layer 128 covers the side of the second protective member 125 away from the single battery 105 and is connected to the fourth connection surface 153. The manner in which the second protective member 125 closes the gap 117 can refer to the manner in which the first protective member 121 closes the gap 117, and will not be repeated here.

[0092] Please continue reading Figure 8 and Fig. 9 In some embodiments, the thickness of the first protective member 121 is t mm, satisfying: 0.1<t<0.3, further, 0.12≤t≤0.2.

[0093] Specifically, the thickness of the first protective member 121 is the dimension of the first protective member 121 in the third direction Z. If the thickness of the first protective member 121 is too large, it will affect the space utilization of the battery pack and cause the cost of the first protective member 121 to be too high. If the thickness of the first protective member 121 is too small, the structural strength of the first protective member 121 will be weakened, which will cause the first protective member 121 to deform at the gap 117, affecting the effect of the first protective member 121 blocking the first adhesive layer 123 from entering the gap 117. Specifically, the value of t is 0.11, 0.12, 0.15, 0.17, 0.2, 0.25, 0.29 or a range consisting of any two of them.

[0094] In one detection scenario, after the first protective member 121 is removed from the battery pack, the first adhesive layer 123 on the surface of the first protective member 121 is cleaned, and the thickness of the first protective member 121 at multiple locations is measured with a vernier caliper and the average value is taken to obtain the thickness of the first protective member 121.

[0095] In addition, when the battery pack has the second protective member 125 , the thickness of the second protective member 125 may be set with reference to the thickness of the first protective member 121 .

[0096] Please continue reading Figure 8 and Fig. 9 In some embodiments, the width of the gap 117 is A mm, and the first protective member 121 is disposed in the width direction of the gap 117 ( Fig. 9 The dimension of the first direction (X) is B mm, satisfying: 1<B / A<5, further, 1.05≤B / A≤1.3. Specifically, the value of B / A is 1.02, 1.05, 1.09, 1.12, 1.15, 1.17, 1.19, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5 or a range consisting of any two of them.

[0097] In one detection scenario, after the first protective member 121 is removed from the battery pack, the first adhesive layer 123 on the surface of the first protective member 121 is cleaned, and the dimensions of the first protective member 121 at multiple locations in the width direction of the gap 117 are measured with a vernier caliper and the average value is taken to obtain the dimension of the first protective member 121 in the width direction of the gap 117. Optionally, 3, 5 or other number of measuring points can be selected on the first protective member 121 at a certain interval to measure the dimension of the first protective member 121 in the width direction of the gap 117. In one detection scenario, after the first protective member 121 is removed from the battery pack, the debris in the gap 117 is cleaned, and the width dimensions of the gap 117 at multiple locations are measured with a vernier caliper and the average value is taken to obtain the width dimension of the gap 117. Optionally, 3, 5 or other number of measuring points can be selected at different locations in the gap 117 at a certain interval to measure the width dimension of the gap 117.

[0098] In addition, when the battery pack has the second protection member 125 , the width relationship between the second protection member 125 and the gap 117 may be set with reference to the width relationship between the first protection member 121 and the gap 117 .

[0099] Please continue reading Figure 8 and Fig. 9 The larger the size of the first connection surface 112 in the first direction X, the easier it is to assemble the first protective member 121 to the single battery 105, but this will cause the size of the second connection surface 113 in the first direction X to decrease, thereby reducing the bonding strength of the single battery 105. In order to facilitate the assembly of the first protective member 121 and minimize the impact on the bonding strength of the single battery 105, the following improvements are also made.

[0100] See also Figures 10 to 12 . Fig.10 It is a three-dimensional structural schematic diagram of the local structure of an embodiment of the battery pack of the present application. Fig.11 yes Fig.10 A top view of the partial structure of the battery pack is shown. Fig.12 yes Fig.10 H2-H2 section view in.

[0101] In some embodiments, the first protective member 121 has a through hole 135, and the first adhesive layer 123 is disposed in the through hole 135 and adhered to the first surface 111. Specifically, the first adhesive layer 123 covers the first protective member 121 and the first surface 111, and the first protective member 121 has a through hole 135, and the first adhesive layer 123 is adhered to the first surface 111 through the through hole 135. The shape of the through hole 135 can be circular, oval, rectangular or other irregular shapes. The number of through holes 135 can be set as needed.

[0102] By providing the through holes 135 , the contact area between the first adhesive layer 123 and the first surface 111 can be increased, thereby improving the bonding strength of the single battery 105 .

[0103] In addition, when the battery pack has the second protection member 125 , the second protection member 125 may also be provided with the through hole 135 .

[0104] See also Fig.13 and Fig.14 . Fig.13 It is a three-dimensional structural schematic diagram of the local structure of an embodiment of the battery pack of the present application. Fig.14 yes Fig.13 H3-H3 section view in.

[0105] In some embodiments, the battery pack further includes an isolator 157, which is embedded in the gap 117 and connected to the third adhesive layer 127. By providing the isolator 157, it is possible to further prevent debris from entering the gap 117. At the same time, the isolator 157 can also form a physical support for the first protective member 121 to prevent the first protective member 121 from deforming at the gap 117.

[0106] In some embodiments, the battery pack includes a heat exchange member 139, which is disposed in the gap 117 and connected to the surface of the single battery 105, and the isolating member 157 abuts against the heat exchange member 139. Specifically, the heat exchange member 139 is sandwiched between two adjacent single batteries 105, and a gap 117 is formed between the two adjacent single batteries 105. The isolating member 157 abuts against the heat exchange member 139 along the third direction Z. When assembling the battery pack, even if the first protective member 121 squeezes the isolating member 157, the blocking of the heat exchange member 139 can ensure that the position of the isolating member 157 in the third direction Z is stable.

[0107] See also Fig.15 . Fig.15 It is a cross-sectional view of the local structure of an embodiment of the battery pack of the present application.

[0108] In some embodiments, the battery pack further includes a stopper 129 . The stopper 129 is protrudingly disposed on a side of the first protective member 121 facing the first adhesive layer 123 and is embedded in the first adhesive layer 123 .

[0109] The dimension of the limiting member 129 in the third direction Z can limit the minimum thickness of the first adhesive layer 123 at the location corresponding to the limiting member 129 .

[0110] In some embodiments, the stopper 129 abuts against the first inner wall 1331 of the box 101 and the first protective member 121 along the third direction Z. Therefore, the size of the stopper 129 in the third direction Z is the thickness of the first adhesive layer 123 at the corresponding stopper 129. In addition, under the abutment of the stopper 129, the first protective member 121 can be closely attached to the first surface 111, thereby preventing the first adhesive layer 123 from entering the gap 117 through the gap between the first protective member 121 and the first surface 111.

[0111] In some embodiments, the stopper 129 and the first protection member 121 are integrally formed, so that the stopper 129 can be more easily assembled.

[0112] In some embodiments, there are multiple limiting members 129 , and the multiple limiting members 129 are configured to be distributed at intervals on the projections of the first surface 111 .

[0113] See also Figure 2 and Figure 7 .

[0114] In some embodiments, multiple single cells 105 are arranged in multiple rows and columns to form a battery pack 106 . Several rows and columns of single cells 105 form a battery pack 106 . The battery pack includes multiple battery packs 106 , and each battery pack 106 is provided with a corresponding first protective member 121 .

[0115] Specifically, Figure 2 In the illustrated embodiment, the first direction X is perpendicular to the second direction Y. A plurality of single cells 105 are arranged in an array along the first direction X and the second direction Y, respectively. Figure 2 In the illustrated embodiment, the number of the battery pack 106 is one. In other embodiments, the number of the battery pack 106 may also be two, three, or more than four.

[0116] The embodiment of the present application also provides an electric device. The electric device is, for example, a new energy vehicle. The electric device includes a battery pack of any of the above embodiments. Since the electric device includes all the technical features of the battery pack, the electric device also includes all the technical effects of the battery pack, which will not be repeated here.

[0117] In summary, the battery pack and electrical equipment provided in the embodiments of the present application close the gap 117 through the first protective member 121, thereby preventing the first adhesive layer 123 from entering the gap 117, so that the first adhesive layer 123 is completely filled between the first inner wall 1331 of the box body 101 and the first surface 111 of the plurality of single cells 105, thereby making the thickness of the first adhesive layer 123 more controllable.

[0118] The introduction provided in the above steps is only used to help understand the method, structure and core idea of ​​the present application. For ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A battery pack, characterized in that: include: A box body, the box body having a containing cavity and a first inner wall located in the containing cavity, A plurality of single cells, the plurality of single cells are accommodated in the accommodation cavity, a gap is provided between two adjacent single cells, and each of the single cells has a first surface facing the first inner wall; a first protective member, the first protective member being disposed on the first surface of two adjacent single cells and closing the gap between the two adjacent single cells; a first adhesive layer, the first adhesive layer being disposed between the first inner wall and the first surface, and between the first inner wall and the first protective member; The area of ​​the first surface of the single battery is S1, the orthographic projection area of ​​the first protective element on the first surface of the single battery is Sa, and 1%<Sa / S1<25%.

2. The battery pack according to claim 1, characterized in that: The box body has a third direction, the box body has a second inner wall located in the accommodating cavity, the gap extends along the third direction, the second inner wall and the first inner wall are arranged opposite to each other along the third direction, and the plurality of single cells further have a second surface facing the second inner wall; the battery pack further includes: a second protective member, the second protective member being disposed on the second surfaces of two adjacent single cells and closing the gap between the two adjacent single cells; a second adhesive layer, the second adhesive layer being disposed between the second inner wall and the second surface, and between the second inner wall and the second protective member; The area of ​​the second surface of the single battery is S2, the orthographic projection area of ​​the second protective element on the second surface of the single battery is Sc, and 1%<Sc / S2<25%.

3. The battery pack according to claim 1, characterized in that: The plurality of single cells are arranged in a plurality of rows and columns, and the gaps include a first gap formed along a first direction and a second gap formed along a second direction; The first protection member includes a plurality of first protection components extending along the first direction and a second protection component extending along the second direction, wherein the first protection components cover the first gaps and the second protection components cover the second gaps; The first direction, the second direction and the third direction intersect each other, the first direction is the length direction of the single battery, the second direction is the width direction of the single battery, and the third direction is the height direction of the single battery.

4. The battery pack according to claim 3, characterized in that: The first protection component and the second protection component are an integrally formed grid structure that is interconnected.

5. The battery pack according to claim 1, characterized in that: The thickness of the first protective member is t mm, satisfying: 0.1<t<0.

3.

6. The battery pack according to claim 2, characterized in that: The battery pack further comprises: A third adhesive layer is adhered to the first surface and a side of the first protective member facing the first surface, and / or the third adhesive layer is adhered to the second surface and a side of the second protective member facing the second surface.

7. The battery pack according to claim 2, characterized in that: The first surface includes a first connection surface and a second connection surface, the first protective member is connected to the first connection surface, the first adhesive layer covers a side of the first protective member facing away from the single cell and is connected to the second connection surface, and / or the second surface includes a third connection surface and a fourth connection surface, the second protective member is connected to the third connection surface, the second adhesive layer covers a side of the second protective member facing away from the single cell and is connected to the fourth connection surface.

8. The battery pack according to claim 1, characterized in that: The battery pack further comprises: A limiting member is protrudingly arranged on a side of the first protective member facing the first adhesive layer and is embedded in the first adhesive layer.

9. The battery pack according to claim 1, characterized in that: The first protective member has a through hole, and the first adhesive layer is passed through the through hole and bonded to the first surface.

10. The battery pack according to claim 6, characterized in that: The battery pack further includes an isolating member, which is embedded in the gap and connected to the third adhesive layer.

11. The battery pack according to claim 10, characterized in that: The battery pack comprises: A heat exchange member is disposed in the gap and connected to the surface of the single battery, and the isolation member abuts against the heat exchange member.

12. The battery pack according to claim 1, characterized in that: The plurality of single cells are arranged in a plurality of rows and columns, and a plurality of rows and columns of single cells form a battery group. The battery pack includes a plurality of the battery groups, and each battery group is correspondingly provided with a first protective member.

13. An electrical equipment, characterized in that: The electrical device comprises a battery pack as claimed in any one of claims 1 to 12.

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