Battery rubber frame and battery assembly

Abstract

The embodiment of the utility model discloses a battery rubber frame and a battery assembly, the battery rubber frame comprises a frame and a bearing part, and the frame defines an accommodating space. The frame is divided into a weight reduction section along the circumferential direction of the accommodating space, the weight reduction section is provided with a weight reduction hole, the weight reduction hole extends towards the accommodating space, the battery rubber frame is provided with a reference plane, the normal direction of the reference plane is parallel to the extending direction of the weight reduction hole, the total orthographic projection area of the weight reduction hole on the reference plane is S1 mm < 2 >, and the orthographic projection area of the weight reduction section on the reference plane is S2 mm < 2 >, and 17.26% < = S1 / S2 < = 24.86%. According to the battery rubber frame provided by the embodiment of the invention, by arranging the lightening holes, the weight of the battery assembly is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery rubber frame and a battery assembly. Background Art

[0002] The laptop battery assembly includes a battery plastic frame, a battery cell and a circuit board arranged in the battery plastic frame. The battery plastic frame, as a structural main body, can protect the battery cell and ensure that each component in the laptop battery assembly is in a predetermined position.

[0003] As a component of portable notebook computers, the laptop battery assembly is undoubtedly one of the core competitiveness of the laptop battery assembly when the capacity and power are the same. In the laptop battery assembly, in addition to the battery cell, the battery frame is the component with the largest weight. Utility Model Content

[0004] The embodiments of the present application provide a battery rubber frame and a battery assembly to reduce their weight.

[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 rubber frame is provided, which has a first direction, a second direction and a third direction which are perpendicular to each other, and includes a frame and a bearing portion, the frame is surrounded to form a accommodating space, the bearing portion is accommodated in the accommodating space, and both ends in the second direction are respectively connected to the frame. The accommodating space is used to accommodate a circuit board which is overlapped with the bearing portion in the first direction, and the accommodating space is also used to accommodate a battery cell which is located on one side of the circuit board in the third direction. The frame divides the accommodating space into a weight-reducing section along the circumference of the accommodating space, and the weight-reducing section is provided with weight-reducing holes, which extend toward the accommodating space, and the battery rubber frame has a reference plane, the normal of the reference plane is parallel to the extension direction of the weight-reducing holes, and the total orthographic projection area of ​​the weight-reducing holes on the reference plane is S1mm 2 , the orthographic projection area of ​​the weight-reducing section on the reference plane is S2mm 2 , 17.26%≤S1 / S2≤24.86%.

[0007] In addition to one or more of the above-disclosed features, the weight-reducing section includes a first connection portion, a second connection portion, and a support rib. The second connection portion is spaced apart from the first connection portion in the first direction; the support rib is connected between the first connection portion and the second connection portion, and the support rib has weight-reducing holes on both sides in the first direction and weight-reducing holes on both sides in the circumferential direction.

[0008] In addition to one or more features disclosed above, the battery rubber frame has a fourth direction and a fifth direction, which are respectively parallel to the reference plane and are respectively inclined relative to the circumferential direction, and the inclination directions are opposite; the support ribs include a first sub-section and a second sub-section. The first sub-section extends along the fourth direction, one end of the first sub-section is connected to the first connecting section, and the other end is connected to the second connecting section; the second sub-section extends along the fifth direction, one end of the second sub-section is connected to the first connecting section, and the other end is connected to the second connecting section; wherein the first sub-section and the second sub-section intersect, and the intersection is respectively located in the middle area of ​​the first sub-section and the second sub-section, and the intersection has weight-reducing holes on both sides in the first direction, and the intersection has weight-reducing holes on both sides in the circumferential direction.

[0009] In addition to one or more features disclosed above, the battery frame has a sixth direction and a seventh direction, the sixth direction and the seventh direction are respectively parallel to the reference plane, the sixth direction is perpendicular to the fourth direction, and the seventh direction is perpendicular to the fifth direction; in the first direction, the first connecting part has a first edge away from the second connecting part, and the second connecting part has a second edge away from the first connecting part, and the minimum spacing between the first edge and the second edge is D1mm; the minimum dimension of the first connecting part in the first direction is D2mm, D2≥0.22*D1; the minimum dimension of the second connecting part in the first direction is D3mm, D3≥0.22*D1; the minimum dimension of the first sub-part in the sixth direction is D4mm, D4≥0.14*D1; the minimum dimension of the second sub-part in the seventh direction is D5mm, D5≥0.14*D1.

[0010] In addition to one or more of the features disclosed above,

[0011] There are multiple weight reduction segments, which are arranged and connected in sequence in the circumferential direction. Two adjacent weight reduction segments are respectively the first weight reduction segment and the second weight reduction segment. The first connecting portion in the first weight reduction segment is connected to the first connecting portion in the second weight reduction segment, the second connecting portion in the first weight reduction segment is connected to the second connecting portion in the second weight reduction segment, the second sub-portion in the first weight reduction segment is connected to the first sub-portion in the second weight reduction segment, and the first sub-portion in the first weight reduction segment is connected to the second sub-portion in the second weight reduction segment.

[0012] In addition to one or more of the features disclosed above, the frame is a rectangular frame, including two long sides and two short sides, the long sides and the short sides are alternately connected, the long sides extend along the third direction, and the short sides extend along the second direction; the load-bearing parts are respectively connected to the two long sides; the weight-reducing section is located on the long side or the short side; when the weight-reducing section is located on the long side, the normal of the reference plane is parallel to the second direction, and the circumferential direction is the third direction; when the weight-reducing section is located on the short side, the normal of the reference plane is parallel to the third direction, and the circumferential direction is the second direction.

[0013] In addition to one or more of the features disclosed above, it also includes a pocket edge, which is convexly arranged on the surface of the long side facing the accommodating space; in the first direction, the battery cell is arranged on one side of the pocket edge; and the surface of the short side facing the accommodating space is a flat surface.

[0014] In addition to one or more of the features disclosed above, the bearing portion is provided with a plurality of first through holes, each of the first through holes penetrates the bearing portion in a first direction, and the plurality of first through holes are distributed on the bearing portion.

[0015] On the other hand, a battery assembly is also provided, the battery assembly comprising a battery frame, a circuit board and a battery cell. The battery frame is any of the above-mentioned battery frames. The circuit board is accommodated in the accommodation space, and in a first direction, the circuit board and the bearing portion overlap. The battery cell is accommodated in the accommodation space and is located on one side of the circuit board in a third direction.

[0016] In addition to one or more of the features disclosed above, the battery assembly also includes an insulating film, which includes a main body and a side portion. The main body covers a side surface of the battery cell in a first direction, the side portion is connected to the main body and folded relative to the main body, and the side portion is adhered to a side surface of the frame facing away from the accommodating space and covers the weight reduction section.

[0017] In addition to one or more of the features disclosed above, the battery assembly also includes a cover plate accommodated in the accommodating space. In a first direction, the cover plate is arranged on the side of the circuit board facing away from the bearing portion. The cover plate is provided with a plurality of second through holes, each of which penetrates the cover plate in the first direction. The plurality of second through holes are distributed on the cover plate.

[0018] One of the above technical solutions has the following advantages or beneficial effects:

[0019] The frame in the battery plastic frame is divided into a weight-reducing section along the circumference of the accommodating space, and the weight-reducing section is provided with a weight-reducing hole, which extends toward the accommodating space. By providing the weight-reducing hole, the weight of the battery plastic frame can be reduced. By limiting the proportion of the opening area of ​​the weight-reducing hole, the structural strength of the battery plastic frame can be ensured while achieving weight reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of a battery assembly of the present application;

[0022] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of the battery assembly shown with some parts omitted;

[0023] Figure 3 yes Figure 1 a three-dimensional exploded view of the battery assembly shown;

[0024] Figure 4 yes Figure 1 A schematic diagram of the three-dimensional structure of the battery plastic frame in the battery assembly shown;

[0025] Figure 5 yes Figure 4 An enlarged view of the partial view A in FIG.

[0026] Figure 6 yes Figure 4 A front view of a plurality of continuous weight-reducing sections in the battery rubber frame shown;

[0027] Figure 7 yes Figure 6 A schematic diagram of a weight loss section;

[0028] Figure 8 yes Figure 6 A schematic diagram showing that the corner of a lightening hole in a lightening section is not rounded;

[0029] Fig. 9 yes Figure 1 A schematic diagram of the three-dimensional structure of the insulating film and battery rubber frame in the battery assembly in the assembled state;

[0030] Fig.10 yes Figure 1 A schematic diagram of the three-dimensional structure of the insulating film and battery rubber frame in the battery assembly shown in the exploded state;

[0031] Fig.11 is a schematic diagram of a battery rubber frame in another embodiment of a battery assembly of the present application;

[0032] Fig.12 yes Fig.11 An enlarged view of the partial view B in FIG.

[0033] Fig.13 is a schematic diagram of a cover plate in yet another embodiment of a battery assembly of the present application;

[0034] Fig.14 This is the data of the battery assembly drop test in the embodiment of this application.

[0035] Explanation of reference numerals: 10-battery rubber frame; 110-frame; 111-weight-reducing hole; 112-weight-reducing section; 113-first connecting portion; 1131-first edge; 114-second connecting portion; 1141-second edge; 115-support ribs; 1151-first sub-portion; 1152-second sub-portion; 116-long side; 117-short side; 118-accommodating space; 1181a-first placement area; 1181b-first placement area; 1182-second placement area Area; 120-bearing part; 121-first through hole; 130-pocket edge; 20-circuit board; 30-battery cell; 40-connector; 50-cover plate; 510-second through hole; 60-insulating film; 610-main body; 620-side part; 630-edge part; 70-insulating part; X-third direction; Z-first direction; Y-second direction; F4-fourth direction; F5-fifth direction; F6-sixth direction; F7-seventh direction; P-reference plane. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] Laptop battery components are battery components used in laptops. With the same capacity and power, smaller weight is undoubtedly one of the core competitiveness of laptop battery components. Naturally, lightweighting of laptop battery components has become a key research and development direction.

[0039] Laptop battery components have a wide variety of categories and designs, but what they all have in common is that the weight of the battery cell accounts for about 90% of the total weight of the laptop battery component, the weight of the battery frame accounts for about 6% of the total weight of the laptop battery component, and other components account for the remaining 4%. Therefore, in addition to the battery cell that guarantees capacity and power, the battery frame becomes the most ideal object for weight reduction.

[0040] In each embodiment of the battery assembly described below in the present application, the battery assembly can be applied to laptop computers, pen-type computers, mobile computers, e-book players, portable phones, portable fax machines, portable copiers, portable printers, head-mounted stereo headphones, video recorders, portable CD players, calculators, portable recorders, radios, backup power supplies, cameras, etc.

[0041] As a mature technical means, topological optimization can reasonably distribute materials and ultimately obtain a force transmission path that meets the design requirements, so that the most ideal strength structure after weight reduction can be obtained. In the following embodiments, the thin-wall reinforcement design and local deformation problems are studied based on the topological optimization method, and a reasonable lightweight structure of the battery rubber frame is obtained.

[0042] See also Figures 1 to 3 . Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of a battery assembly of the present application. Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of the battery assembly with some parts omitted. Figure 3 yes Figure 1 3D exploded view of the battery assembly shown.

[0043] For the convenience of description, the following definition is made: the battery assembly has a first direction Z, a second direction Y and a third direction X which are perpendicular to each other.

[0044] The battery assembly includes a battery plastic frame 10 , a circuit board 20 , a battery cell 30 , a connector 40 , a cover plate 50 , an insulating member 70 and an insulating film 60 .

[0045] The battery plastic frame 10 is used as the structural body of the battery assembly to install the other components of the battery assembly. The battery plastic frame 10 is surrounded to form an accommodating space 118. The accommodating space 118 can be divided into a first placement area 1181a, a first placement area 1181b and a second placement area 1182. The first placement area 1181a and the first placement area 1181b are respectively located on opposite sides of the second placement area 1182 in the third direction X.

[0046] The circuit board 20 is accommodated in the second placement area 1182 of the accommodation space 118. In the third direction X, the circuit board 20 is substantially located in the middle area of ​​the battery plastic frame 10.

[0047] The connector 40 is connected to the circuit board 20 for electrical connection with the outside world. The connector 40 is not necessary, and in other embodiments, the connector 40 may not be provided.

[0048] The number of battery cells 30 is four. Two of the battery cells 30 are stacked in the first placement area 1181a in the first direction Z and are located on one side of the circuit board 20 in the third direction X. The other two battery cells 30 are stacked in the first placement area 1181b in the first direction Z and are located on the other side of the circuit board 20 in the third direction X. Each battery cell 30 is accommodated in the accommodation space 118 and is electrically connected to the circuit board 20. The thickness direction of the battery cell 30 is the first direction Z.

[0049] In some other embodiments, the number of the battery cells 30 may also be two, and the two battery cells 30 are respectively located on both sides of the circuit board 20 in the third direction X. In some other embodiments, the number of the battery cells 30 may also be six, eight or more.

[0050] In some other embodiments, the number of battery cells 30 on both sides of the circuit board 20 in the third direction X may also be different, and can be specifically set according to needs.

[0051] In other embodiments, the circuit board 20 may also be located at one end of the battery plastic frame 10 in the third direction X, and correspondingly, all the battery cells 30 are located on the same side of the circuit board 20. That is, the accommodating space 118 is divided into a first placement area 1181a and a second placement area 1182. The first placement area 1181a is located on one side of the second placement area 1182 in the third direction X.

[0052] In some embodiments, the battery cell 30 is a soft pack battery. A soft pack battery is a lithium ion battery using a soft pack material. Compared with a traditional steel shell lithium ion battery, it is lighter, thinner and more flexible. The outer packaging of a soft pack battery usually uses soft materials such as aluminum plastic film and aluminum foil to make the battery lighter and thinner, and can be customized according to product requirements.

[0053] In some embodiments, two adjacent battery cells 30 stacked in the first direction Z are fixedly connected by double-sided tape.

[0054] The cover plate 50 is accommodated in the accommodation space 118 and is stacked with the circuit board 20 in the first direction Z. The cover plate 50 covers the circuit board 20 to prevent other objects from damaging the circuit board 20 .

[0055] The insulating member 70 is attached to one side of the battery plastic frame 10 in the first direction Z and covers the battery cell 30. In some embodiments, the insulating member 70 is a polycarbonate sheet.

[0056] The insulating film 60 is attached to the other side of the battery plastic frame 10 in the first direction Z, and wraps the outer peripheral side of the battery plastic frame 10. The insulating film 60 covers the battery cell 30. In some embodiments, the insulating film 60 is a Mylar film.

[0057] To achieve the purpose of weight reduction, in the embodiment of the present application, while ensuring that the structural strength of the battery plastic frame 10 meets the use requirements, a weight reduction hole 111 is provided on the battery plastic frame 10. The details are as follows.

[0058] Please also read Figures 4 to 6 . Figure 4 yes Figure 1 A schematic diagram of the three-dimensional structure of the battery plastic frame 10 in the battery assembly is shown. Figure 5 yes Figure 4 An enlarged view of detail view A in FIG. Figure 6 yes Figure 4 A front view of a plurality of continuous weight-reducing sections 112 in the battery plastic frame 10 is shown. Figure 6 The boundary of the weight reduction section 112 is outlined by a dotted frame.

[0059] The battery plastic frame 10 includes a frame 110 and a carrying portion 120 .

[0060] The frame 110 is arranged to form a receiving space 118. Specifically, the frame 110 is a rectangular frame. The frame 110 includes two long sides 116 and two short sides 117, the long sides 116 and the short sides 117 are alternately connected, the long sides 116 extend along the third direction X, and the short sides 117 extend along the second direction Y. In other embodiments, the frame 110 can also be selected into other suitable shapes according to actual needs, such as a circular shape or an irregular shape.

[0061] The carrying portion 120 is accommodated in the accommodating space 118. Both ends in the second direction Y are connected to the frame 110 respectively. The carrying portion 120 forms the second placement area 1182 on the side facing the accommodating space 118, and the rest of the accommodating space 118 forms the first placement area 1181a and the first placement area 1181b. Specifically, when the frame 110 is a rectangular frame, the carrying portion 120 is connected to the two long sides 116 respectively. In the third direction X, the carrying portion 120 is spaced apart from the two short sides 117 respectively. In the first direction Z, the circuit board 20 and the carrying portion 120 overlap.

[0062] The frame 110 is divided into weight-reducing sections 112 along the circumference of the accommodation space 118. Specifically, the frame 110 may be provided with multiple weight-reducing sections 112 at one of the circumferences of the accommodation space 118, and the multiple weight-reducing sections 112 are sequentially arranged and connected in the circumference. The frame 110 may also be provided with only one weight-reducing section 112 at one of the circumferences of the accommodation space 118.

[0063] Each weight-reducing section 112 is provided with a weight-reducing hole 111. The weight-reducing hole 111 extends toward the accommodation space 118. The battery assembly has a reference plane P. The normal of the reference plane P is parallel to the extension direction of the weight-reducing hole 111. The total orthographic projection area of ​​the weight-reducing hole 111 on the reference plane P is S1mm 2 The orthographic projection area of ​​the weight-reducing section 112 on the reference plane P is S2mm 2 , battery cell 17.26%≤S1 / S2≤24.86%.

[0064] When the frame 110 is a rectangular frame, the weight-reducing section 112 is located at the long side 116 or the short side 117. When the weight-reducing section 112 is located at the long side 116, the normal direction of the reference plane P is parallel to the second direction Y. Correspondingly, the circumferential direction of the accommodation space 118 is the third direction X. When the weight-reducing section 112 is located at the short side 117, the normal direction of the reference plane P is parallel to the third direction X, and correspondingly, the circumferential direction of the accommodation space 118 is the second direction Y.

[0065] exist Figure 1 In the battery assembly shown, the long side 116 and the short side 117 of the frame 110 are both provided with a weight-reducing section 112, thereby making the weight-reducing area of ​​the frame 110 more evenly distributed in the circumferential direction of the accommodating space 118. In other embodiments, the weight-reducing section 112 may also be provided only on the long side 116, or only on the short side 117, as required.

[0066] When the frame 110 is a circular frame, the circumferential direction of the accommodating space 118 is the circumferential direction.

[0067] exist Figure 1 In the battery assembly shown, the weight-reducing hole 111 passes through the frame 110, that is, the weight-reducing hole 111 is a through hole. Usually, the battery plastic frame 10 is produced by injection molding. The thickness of the frame 110 is small, and the weight-reducing hole 111 is set to pass through the frame 110, which makes it easier to manufacture the molding mold. In some other embodiments, the weight-reducing hole 111 may not pass through the frame 110, that is, the weight-reducing hole 111 is in the form of a blind hole, which can also achieve the purpose of weight reduction.

[0068] When the battery plastic frame 10 is produced by injection molding, in order to facilitate the molding of the weight-reducing hole 111 , the corner of the weight-reducing hole 111 is designed to be an arc transition.

[0069] When the battery plastic frame 10 is produced by injection molding, the weight-reducing hole 111 is designed to have a certain draft angle to facilitate the molding of the weight-reducing hole 111. Specifically, the inner wall surface of the weight-reducing hole 111 is inclined relative to the extension direction of the weight-reducing hole 111, and the opening diameter of the weight-reducing hole 111 on the outer peripheral wall surface of the frame 110 is larger than the opening diameter of the weight-reducing hole 111 on the inner peripheral wall surface of the frame 110.

[0070] In the embodiment of the present application, the frame 110 in the battery plastic frame 10 is divided into a weight-reducing section 112 along the circumference of the accommodating space 118, and the weight-reducing section 112 is provided with a weight-reducing hole 111, and the weight-reducing hole 111 extends toward the accommodating space 118. By providing the weight-reducing hole 111, the weight of the battery plastic frame 10 can be reduced. By limiting the proportion of the opening area of ​​the weight-reducing hole 111, the structural strength of the battery plastic frame 10 can be ensured while achieving weight reduction.

[0071] See also Figure 7 and Figure 8 . Figure 7 yes Figure 6 Schematic diagram of a weight reduction section 112. Figure 8 yes Figure 6 The schematic diagram shows that the corner of the lightening hole 111 in the lightening section 112 is not rounded. Figure 7 In the embodiment, the corners of the weight-reducing holes 111 are formed by arc transition, which makes the shape of the support ribs 115 unclear. In order to make the shape of the support ribs 115 more obvious, Figure 8 The figure shows that the corners of the lightening hole 111 are not rounded.

[0072] The weight-reducing section 112 includes a first connection portion 113, a second connection portion 114, and a support rib 115. The second connection portion 114 is spaced apart from the first connection portion 113 in the first direction Z. The support rib 115 is generally in an "X" shape. The support rib 115 is connected between the first connection portion 113 and the second connection portion 114, and the support rib 115 has a weight-reducing hole 111a and a weight-reducing hole 111b on both sides in the first direction Z, and has a weight-reducing hole 111c and a weight-reducing hole 111d on both sides in the circumferential direction.

[0073] For the convenience of description, it is defined that: the battery assembly has a fourth direction F4 and a fifth direction F5, the fourth direction F4 and the fifth direction F5 are respectively parallel to the reference plane P, and are respectively inclined relative to the circumferential direction, and the inclination directions are opposite. Figure 8 In the figure, the circumferential direction is the third direction X, so the fourth direction F4 and the fifth direction F5 are respectively inclined relative to the third direction X, and the inclination directions are opposite. The battery assembly also has a sixth direction F6 and a seventh direction F7, which are respectively parallel to the reference plane P, the sixth direction F6 is perpendicular to the fourth direction F4, and the seventh direction F7 is perpendicular to the fifth direction F5. Specifically, the angle between the fourth direction F4 and the fifth direction F5 is 60°, and the angle between the fourth direction F4 and the third direction X is 30°.

[0074] Specifically, the support rib 115 includes a first sub-portion 1151 and a second sub-portion 1152. The first sub-portion 1151 extends along the fourth direction F4, one end of the first sub-portion 1151 is connected to the first connection portion 113, and the other end is connected to the second connection portion 114. The second sub-portion 1152 extends along the fifth direction F5, one end of the second sub-portion 1152 is connected to the first connection portion 113, and the other end is connected to the second connection portion 114. The first sub-portion 1151 and the second sub-portion 1152 intersect, and the intersection 1153 is located in the middle area of ​​the first sub-portion 1151 and the second sub-portion 1152. The intersection 1153 has a weight-reducing hole 111a and a weight-reducing hole 111b on both sides in the first direction Z, and has a weight-reducing hole 111c and a weight-reducing hole 111d on both sides in the circumferential direction.

[0075] Specifically, the weight-reducing holes 111a, 111b, 111c, and 111d are respectively in the shape of isosceles triangles (arc transition is not considered), wherein the weight-reducing holes 111a and 111b are symmetrically arranged about the intersection 1153, and the weight-reducing holes 111c and 111d are symmetrically arranged about the intersection 1153.

[0076] In the first direction Z, the first connection portion 113 has a first edge 1131 away from the second connection portion 114, and the second connection portion 114 has a second edge 1141 away from the first connection portion 113, and the minimum distance between the first edge 1131 and the second edge 1141 is D1mm. The minimum dimension of the first connection portion 113 in the first direction Z is D2mm, D2≥0.22*D1. The minimum dimension of the second connection portion 114 in the first direction Z is D3mm, D3≥0.22*D1. The minimum dimension of the first sub-portion 1151 in the sixth direction F6 is D4mm, D4≥0.14*D1. The minimum dimension of the second sub-portion 1152 in the seventh direction F7 is D5mm, D5≥0.14*D1.

[0077] When a plurality of weight-reducing sections 112 are sequentially arranged and connected in the circumferential direction, two adjacent weight-reducing sections 112 are respectively the first weight-reducing section 112a and the second weight-reducing section 112b, the first connection portion 113 in the first weight-reducing section 112a is connected to the first connection portion 113 in the second weight-reducing section 112b, the second connection portion 114 in the first weight-reducing section 112a is connected to the second connection portion 114 in the second weight-reducing section 112b, the second subsection 1152 in the first weight-reducing section 112a is connected to the first subsection 1151 in the second weight-reducing section 112b, and the first subsection 1151 in the first weight-reducing section 112a is connected to the second subsection 1152 in the second weight-reducing section 112b. The weight-reducing hole 111d formed in the first weight-reducing section 112a is connected to the weight-reducing hole 111c formed in the second weight-reducing section 112b.

[0078] In one detection scenario, a vernier caliper is used to detect the values ​​of the above dimensions. Among them, regarding the value of D4, auxiliary lines can be made on the outer wall or inner wall of the frame 110 to show the shape of the weight-reducing hole 111 when no arc transition is set, and then the value of D4 is measured based on the auxiliary lines. Specifically, the auxiliary lines serve as extension lines of the sides of the weight-reducing hole 111, and the corners of the weight-reducing hole 111 are displayed through the auxiliary lines. Similarly, the value of D5 can be measured using the same method.

[0079] See also Fig. 9 and Fig.10 . Fig. 9 yes Figure 1 The three-dimensional structure diagram of the insulating film 60 and the battery plastic frame 10 in the battery assembly is shown in the assembled state. Fig.10 yes Figure 1 The three-dimensional structure schematic diagram of the insulating film 60 and the battery plastic frame 10 in the battery assembly is shown in a disassembled state.

[0080] In some embodiments, the insulating film 60 includes a main body 610, a side portion 620 and an edge portion 630. The main body 610 covers a side surface of the battery cell 30 in the first direction Z. The side portion 620 is connected to the main body 610 and is folded relative to the main body 610. The side portion 620 is adhered to a side surface of the frame 110 that is away from the accommodating space 118 and covers the weight reduction section 112. The edge portion 630 is connected to an edge of the side portion 620 that is away from the main body 610 and is folded relative to the main body 610. The edge portion 630 is adhered to a side surface of the insulating member 70 that is away from the battery rubber frame 10. The main body 610, the side portion 620 and the edge portion 630 are an integrated structure.

[0081] By covering the lightening section 112 with the side portion 620 , the lightening hole 111 can be prevented from being exposed, so that the appearance of the battery assembly provided with the lightening hole 111 remains unchanged compared to the battery assembly without the lightening hole 111 .

[0082] See also Figure 4 and Figure 5 The battery plastic frame 10 also includes a pocket edge 130. The pocket edge 130 is convexly disposed on the surface of the frame 110 facing the accommodating space 118. In the first direction Z, the battery cell 30 is disposed on one side of the pocket edge 130. Specifically, the pocket edge 130 is integrally formed with the frame 110 and is located at one end of the frame 110 in the first direction Z. Under the action of the insulating film 60, the battery cell 30 is pressed against the pocket edge 130 in the first direction Z. By providing the pocket edge 130, the position of the battery cell 30 in the first direction Z can be limited.

[0083] Figure 1In the illustrated embodiment, both the long side 116 and the short side 117 of the frame 110 are provided with pocket edges 130. In other embodiments, in order to further reduce the weight of the battery plastic frame 10, the pocket edges 130 may also be provided only on the long side 116 of the frame 110.

[0084] In order to verify the structural strength of the battery plastic frame 10 in the embodiment of the present application, the embodiment of the present application also performs a drop test on the battery assembly. Figure 1 A battery assembly of the illustrated embodiment.

[0085] Test method: The drop height is 1000mm±10mm. The target of the drop is a wooden board. The wooden board includes a layer of hardwood board with a thickness of at least 13mm and two layers of plywood with a thickness of 19-20mm. The wooden board is placed on a cement floor or other non-elastic floor. The battery cells in the battery assembly are fully charged. Each sample is dropped from a corresponding height onto the wooden board. The angle of the drop is in the direction that is most likely to cause the sample to explode or catch fire, and each sample is dropped 3 times.

[0086] Judgment conditions: The sample does not catch fire, explode or leak, and the battery rubber frame should not be deformed to expose the battery cell, and it is judged to be qualified.

[0087] Related test data can be found in Fig.14 .

[0088] The drop test pass rate must reach more than 95% to meet the design requirements.

[0089] It can be seen from Examples 1 to 11 that when 17.26% ≤ S1 / S2 ≤ 24.86%, the drop test pass rate is greater than 95%, which meets the design requirements. In Comparative Example 1, S1 / S2 is outside the range of 17.26% to 24.86%, and the weight reduction hole is too small to form. In Comparative Example 2, S1 / S2 is outside the range of 17.26% to 24.86%, and the drop test pass rate is less than 95%, which does not meet the design requirements.

[0090] It can be seen from Examples 1-4 and 6-11 that when 17.26%≤S1 / S2≤24.86% and D2≥0.22*D1 and D3≥0.22*D1 are satisfied, the drop test pass rate reaches more than 99.1%. In Example 5, although 17.26%≤S1 / S2≤24.86% is satisfied, D2 and D3 are less than 0.22*D1, and the drop test pass rate is slightly less than 99.1%, but still greater than 95%, which meets the design requirements.

[0091] It can be seen from Examples 1-5 and 7-11 that when 17.26%≤S1 / S2≤24.86% and D4≥0.14*D1 and D5≥0.14*D1 are satisfied, the drop test pass rate reaches more than 98.7%. In Example 6, although 17.26%≤S1 / S2≤24.86% is satisfied, D4 and D5 are less than 0.14*D1, and the drop test pass rate is slightly less than 98.7%, but still greater than 95%, which meets the design requirements.

[0092] The D2-D5 value range and S1 / S2 value range specified in this proposal meet both weight reduction requirements and structural strength requirements.

[0093] See also Fig.11 and Fig.12 . Fig.11 It is a schematic diagram of a battery plastic frame 10 in another embodiment of the battery assembly of the present application. Fig.12 yes Fig.11 An enlarged view of detail view B in FIG.

[0094] In some embodiments, the pocket edge 130 is convexly disposed on the surface of the long side 116 facing the accommodating space 118. In the first direction Z, the battery cell 30 is disposed on one side of the pocket edge 130. The pocket edge 130 extends in the third direction X. The surface of the short side 117 facing the accommodating space 118 is a flat surface, that is, the pocket edge 130 is not disposed on the short side 117.

[0095] exist Fig.11 In the battery plastic frame 10 shown, pocket edges 130 are provided only on the two long sides 116 , respectively. Compared with providing pocket edges 130 on both the long sides 116 and the short sides 117 , the weight of the battery plastic frame 10 can be reduced in just one step.

[0096] Please continue reading Fig.11 and Fig.12 .

[0097] In some embodiments, the bearing portion 120 is provided with a plurality of first through holes 121, each of which penetrates the bearing portion 120 in the first direction Z, and the plurality of first through holes 121 are distributed on the bearing portion 120. Specifically, the plurality of first through holes 121 are arranged in a plane perpendicular to the first direction Z, and are arranged in a row in the second direction Y and the third direction X. Each first through hole 121 is rhombus-shaped. In other embodiments, the first through holes 121 may also be rectangular holes, circular holes, or irregularly shaped holes.

[0098] By providing a plurality of first through holes 121 , the weight of the battery plastic frame 10 can be further reduced, and at the same time, it is also beneficial to dissipate heat of the circuit board 20 .

[0099] When the insulating member 70 is provided, the insulating member 70 covers the carrying portion 120 to prevent the first through hole 121 from being exposed, so that the appearance of the battery assembly provided with the first through hole 121 remains unchanged compared to the battery assembly without the first through hole 121 .

[0100] See also Fig.13 . Fig.13 It is a schematic diagram of a cover plate 50 in another embodiment of the battery assembly of the present application.

[0101] In the first direction Z, the cover plate 50 is disposed on the side of the circuit board 20 facing away from the bearing portion 120. The cover plate 50 is provided with a plurality of second through holes 510, each of which penetrates the cover plate 50 in the first direction Z, and the plurality of second through holes 510 are distributed on the cover plate 50. Specifically, the plurality of second through holes 510 are arranged in a plane perpendicular to the first direction Z, and are arranged in an array in the second direction Y and the third direction X, respectively. Each second through hole 510 is rhombus-shaped. In other embodiments, the second through holes 510 may also be rectangular holes, circular holes, or holes of irregular shapes.

[0102] By providing a plurality of second through holes 510 , the weight of the battery assembly can be further reduced, and at the same time, it is also beneficial for heat dissipation of the circuit board 20 .

[0103] When the insulating film 60 is provided, the main body 610 of the insulating film 60 also covers the cover plate 50, which can prevent the second through hole 510 from being exposed, so that the battery assembly provided with the second through hole 510 has no change in appearance compared to the battery assembly without the second through hole 510.

[0104] In summary, the battery assembly provided in the embodiment of the present application reduces the weight of the battery assembly by providing the weight-reducing holes 111 on the battery rubber frame 10 .

[0105] 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 plastic frame, characterized in that: The battery plastic frame has a first direction, a second direction and a third direction which are perpendicular to each other, and the battery plastic frame includes: A frame and a carrying portion, wherein the frame is surrounded to form a receiving space, the carrying portion is received in the receiving space, and both ends in the second direction are respectively connected to the frame, the receiving space is used to receive a circuit board stacked with the carrying portion in the first direction, and the receiving space is also used to receive a battery cell located on one side of the circuit board in the third direction; The frame is divided into a weight-reducing section along the circumference of the accommodating space, and the weight-reducing section is provided with a weight-reducing hole, which extends toward the accommodating space. The battery rubber frame has a reference plane, and the normal of the reference plane is parallel to the extension direction of the weight-reducing hole. The total orthographic projection area of ​​the weight-reducing hole on the reference plane is S1mm 2 The orthographic projection area of ​​the weight-reducing section on the reference plane is S2mm 2 , 17.26%≤S1 / S2≤24.86%.

2. The battery plastic frame as claimed in claim 1, characterized in that: The weight reduction stage includes: a first connecting portion; a second connecting portion, spaced apart from the first connecting portion in the first direction; A support rib is connected between the first connection portion and the second connection portion, wherein the support rib has the weight-reducing holes on both sides in the first direction and the support rib has the weight-reducing holes on both sides in the circumferential direction.

3. The battery plastic frame as claimed in claim 2, characterized in that: The battery rubber frame has a fourth direction and a fifth direction, the fourth direction and the fifth direction are respectively parallel to the reference plane, and are respectively inclined relative to the circumferential direction, and the inclination directions are opposite; The supporting ribs include: a first sub-portion extending along the fourth direction, wherein one end of the first sub-portion is connected to the first connecting portion, and the other end of the first sub-portion is connected to the second connecting portion; a second sub-portion extending along the fifth direction, wherein one end of the second sub-portion is connected to the first connecting portion, and the other end of the second sub-portion is connected to the second connecting portion; Among them, the first sub-section and the second sub-section intersect, and the intersection is respectively located in the middle area of ​​the first sub-section and the second sub-section, and the intersection has the weight-reducing holes on both sides in the first direction, and the intersection has the weight-reducing holes on both sides in the circumferential direction.

4. The battery plastic frame as claimed in claim 3, characterized in that: The battery plastic frame has a sixth direction and a seventh direction, the sixth direction and the seventh direction are respectively parallel to the reference plane, the sixth direction is perpendicular to the fourth direction, and the seventh direction is perpendicular to the fifth direction; In the first direction, the first connecting portion has a first edge facing away from the second connecting portion, the second connecting portion has a second edge facing away from the first connecting portion, and the minimum distance between the first edge and the second edge is D1 mm; The minimum dimension of the first connecting portion in the first direction is D2 mm, D2 ≥ 0.22*D1; The minimum dimension of the second connecting portion in the first direction is D3 mm, where D3 ≥ 0.22*D1; The minimum dimension of the first sub-portion in the sixth direction is D4 mm, D4 ≥ 0.14*D1; The minimum dimension of the second sub-portion in the seventh direction is D5 mm, and D5 ≥ 0.14*D1.

5. The battery plastic frame as claimed in claim 3, characterized in that: There are multiple weight reduction segments, which are arranged and connected in sequence in the circumferential direction, and two adjacent weight reduction segments are respectively the first weight reduction segment and the second weight reduction segment, the first connecting portion in the first weight reduction segment is connected to the first connecting portion in the second weight reduction segment, the second connecting portion in the first weight reduction segment is connected to the second connecting portion in the second weight reduction segment, the second sub-portion in the first weight reduction segment is connected to the first sub-portion in the second weight reduction segment, and the first sub-portion in the first weight reduction segment is connected to the second sub-portion in the second weight reduction segment.

6. The battery plastic frame as claimed in claim 1, characterized in that: The frame is a rectangular frame, including two long sides and two short sides, the long sides and the short sides are alternately connected, the long sides extend along the third direction, and the short sides extend along the second direction; The bearing parts are respectively connected to the two long sides; The weight-reducing section is located at the long side or the short side; When the weight-reducing section is located at the long side, the normal direction of the reference plane is parallel to the second direction, and the circumferential direction is the third direction; When the weight-reducing section is located at the short side, the normal direction of the reference plane is parallel to the third direction, and the circumferential direction is the second direction.

7. The battery plastic frame as claimed in claim 6, characterized in that: Also includes: A pocket edge, the pocket edge being convexly arranged on a surface of the long side facing the accommodating space; In the first direction, the battery cell is arranged on one side of the pocket edge; The surface of the short side facing the accommodating space is a flat surface.

8. The battery plastic frame as claimed in claim 1, characterized in that: The bearing portion is provided with a plurality of first through holes, each of the first through holes penetrates the bearing portion in the first direction, and the plurality of first through holes are distributed on the bearing portion.

9. A battery assembly, characterized in that: include: The battery plastic frame according to any one of claims 1 to 8; A circuit board is accommodated in the accommodation space, and in the first direction, the circuit board is overlapped with the carrying portion; The battery cell is accommodated in the accommodation space and is located at one side of the circuit board in the third direction.

10. The battery assembly according to claim 9, characterized in that: Also includes: The insulating film includes a main body and a side portion, the main body covers a side surface of the battery cell in the first direction, the side portion is connected to the main body and folded relative to the main body, the side portion is adhered to a side surface of the frame facing away from the accommodating space and covers the weight reduction section.

11. The battery assembly according to claim 9, characterized in that: Also includes: A cover plate is accommodated in the accommodating space. In the first direction, the cover plate is arranged on the side of the circuit board facing away from the bearing portion. The cover plate is provided with a plurality of second through holes. Each of the second through holes penetrates the cover plate in the first direction. The plurality of second through holes are distributed on the cover plate.

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