Battery pack and electric device

Abstract

The application discloses a battery pack and an electric device, wherein the battery pack comprises: a soft package battery and a PCB board. A plurality of soft package batteries are distributed along the width direction of the soft package battery, the soft package battery comprises a shell and a battery core, the shell comprises a packaging part and a side sealing edge part, the battery core is located in the packaging part, and the two sides of the packaging part opposite to each other are provided with the side sealing edge part along the width direction of the soft package battery. The side sealing edge part between the adjacent packaging parts is an inner side sealing edge part, and one end of the packaging part in the length direction of the soft package battery has a first surface. The PCB board is located on the first surface of the soft package battery, the inner side sealing edge part protrudes towards the PCB board relative to the first surface, the PCB board has a second surface opposite to each other along the thickness direction of the PCB board, one of the second surfaces faces the first surface, the PCB board has a first air-avoiding groove, and part of the inner side sealing edge part extends into the first air-avoiding groove, so that the distance between the PCB board and the packaging part is reduced, the length of the battery pack is reduced, and the energy density of the battery pack in the embodiment is improved.

Description

TECHNICAL FIELD

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

[0002] In order to improve the performance of the battery, two batteries are connected together by series and parallel connection to form a battery pack, and the specific structure is that a PCB board is arranged at the top sealing edge of the soft package battery, and the positive and negative pole ears of the two soft package batteries are welded on the same PCB board and then packaged. In order to avoid the interference between the side sealing edge between the soft package batteries and the PCB, the prior art usually includes two setting methods, one is to arrange the PCB board parallel to the top sealing edge, the thickness of the PCB board corresponds to the length of the soft package battery, and the part of the side sealing edge protruding from the top sealing edge is bent and arranged in close contact with the top sealing edge, so that the protruding part of the side sealing edge is clamped between the PCB board and the top sealing edge, but this will increase the distance between the PCB board and the top sealing edge. The other way is to arrange the PCB board perpendicular to the top sealing edge, the width of the PCB board corresponds to the length of the soft package battery, and the PCB board is located at the top of the side sealing edge, and this way will also increase the length of the battery pack.

[0003] Therefore, no matter which way is used, the length of the battery pack will be increased, which reduces the energy density of the battery pack. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a battery pack which can have a higher energy density.

[0005] The present application also provides a power consumption device comprising the above battery pack.

[0006] The battery pack according to the first aspect of the present application comprises a soft package battery and a PCB board.

[0007] The battery pack comprises a plurality of soft package batteries distributed along the width direction of the soft package batteries, each of the soft package batteries comprising a shell and an electric core, the shell comprising a packaging portion and a side sealing edge portion, the electric core being located in the packaging portion, the packaging portion being provided with the side sealing edge portion on both sides opposite to each other along the width direction of the soft package battery, the side sealing edge portion between adjacent packaging portions being an inner side sealing edge portion, and one end of the packaging portion in the length direction of the soft package battery having a first surface; the PCB board is located at one end of the soft package battery in the length direction, the inner side sealing edge portion protrudes towards the PCB board relative to the first surface, the PCB board has two second surfaces opposite to each other along the thickness direction of the PCB board, one of the second surfaces faces the first surface, each of the soft package batteries is electrically connected to the PCB board, the PCB board has a first avoiding slot, and part of the inner side sealing edge portion extends into the first avoiding slot.

[0008] The battery pack according to the embodiments of the present application has at least the following beneficial effects:

[0009] In the present embodiment, the PCB board is arranged towards the first surface of the packaging portion, that is, the thickness of the PCB board corresponds to the length of the soft package battery, and since the PCB board is provided with the first avoiding slot, the inner side sealing edge portion can extend into the first avoiding slot to avoid interference between the PCB board and the inner side sealing edge portion. Therefore, compared with the prior art, in the present embodiment, the thickness of the PCB board corresponds to the length of the soft package battery, the increase in the length of the battery pack caused by the width of the PCB board is avoided, and the PCB board has the first avoiding slot for avoiding the inner side sealing edge portion, so that the inner side sealing edge portion does not need to be bent and clamped between the PCB board and the packaging portion, thereby eliminating the need to arrange a gap between the PCB board and the packaging portion for accommodating the inner side sealing edge portion, reducing the distance between the PCB board and the packaging portion, and further reducing the length of the battery pack to improve the energy density of the battery pack of the present embodiment.

[0010] According to some embodiments of the present application, the inner side sealing edge portion has a third surface facing the PCB board along the thickness direction of the soft package battery, the inner side sealing edge portion has a second avoiding slot, the second avoiding slot penetrates through the inner side sealing edge portion along the width direction of the soft package battery and extends to the third surface, and part of the PCB board extends into the second avoiding slot.

[0011] According to some embodiments of the present application, the second avoiding slot forms a notch at the third surface, and the notch has two opposite edges along the length direction of the soft package battery.

[0012] According to some embodiments of the present application, the inner side sealing edge portion has a fourth surface close to the PCB board along the length direction of the soft package battery, and the second avoiding slot extends to the fourth surface.

[0013] According to some embodiments of the present application, the inner side sealing edge comprises a first folding portion, the first folding portion is folded away from the PCB board to form the second air gap.

[0014] According to some embodiments of the present application, the inner side sealing edge portion has two fifth surfaces opposite in the width direction of the soft package battery, an edge where the fifth surface intersects with the third surface is a first edge, an edge where the fifth surface intersects with the fourth surface is a second edge, the first folding portion forms a first crease on the fifth surface;

[0015] One end of the first crease is located at the first edge, and the other end is located at the second edge; or,

[0016] One end of the first crease is located at the first edge, and the other end is located at the second edge; or,

[0017] One end of the first crease is located at the second edge, and the other end is located at the first edge.

[0018] According to some embodiments of the present application, one end of the first crease is located at the first edge, and the other end is located at the second edge, in the thickness direction of the soft package battery, the first air gap has a first inner wall surface facing the inner side sealing edge portion, and in the direction from the soft package battery to the PCB board, the first inner wall surface is inclinedly arranged towards the first folding portion.

[0019] According to some embodiments of the present application, the inner side sealing edge portion has two fifth surfaces opposite in the width direction of the soft package battery, in the thickness direction of the soft package battery, the second air gap has a second inner wall surface facing the PCB board, an edge where the fifth surface intersects with the fourth surface is a second edge, and an edge where the fifth surface intersects with the second inner wall surface is a third edge;

[0020] The inner side sealing edge portion further comprises a second folding portion, the second folding portion is arranged to be folded away from the PCB board to form a third air gap in communication with the second air gap, and a second crease is formed on the fifth surface, one end of the second crease is located at the second edge, and the other end is located at the third edge.

[0021] According to some embodiments of the present application, one end of the second crease is located at one end of the second edge away from the PCB board, and the included angle between the second crease and the length direction of the soft package battery is α, 35°<α≤70°.

[0022] According to some embodiments of the present application, the first emptying groove has a first inner wall surface facing the inner side sealing edge portion, which is arranged to be inclined towards the second folding portion in the direction from the soft package battery to the PCB board.

[0023] According to some embodiments of the present application, the PCB board has a circuit electrically connected to the soft package battery, and the circuit is located on the second surface of the PCB board facing away from the soft package battery.

[0024] According to some embodiments of the present application, the shell further comprises a top sealing edge portion connected to the first surface and arranged to be folded towards the first surface.

[0025] According to some embodiments of the present application, in the length direction of the soft package battery, the inner side sealing edge portion has a fourth surface close to the PCB board, the top sealing edge portion is arranged to be curved away from the first surface on the side close to the inner side sealing edge portion and extends to the fourth surface to form an extension portion, the extension portion has a fourth emptying groove, and the PCB board extends into the fourth emptying groove.

[0026] According to some embodiments of the present application, the size of the first emptying groove is 1.5mm to 3mm in the thickness direction of the soft package battery.

[0027] According to some embodiments of the present application, the inner side sealing edge portion is cut to form the second emptying groove, and the size of the second emptying groove is 0.3mm to 2mm in the thickness direction of the soft package battery.

[0028] The power consuming device according to the second aspect of the embodiments of the present application comprises the battery pack according to the first aspect of the embodiments.

[0029] The power consuming device according to the embodiments of the present application has at least the following beneficial effects:

[0030] The battery pack adopting the first aspect embodiment is provided with the PCB plate facing the first surface of the packaging part, that is, the thickness of the PCB plate corresponds to the length of the soft package battery, and since the PCB plate is provided with the first avoiding slot, the inner side sealing part can extend into the first avoiding slot to avoid the interference between the PCB plate and the inner side sealing part. Therefore, compared with the prior art, in the embodiment, the thickness of the PCB corresponds to the length of the soft package battery, the increase of the width of the battery pack caused by the width of the PCB is avoided, and the first avoiding slot is arranged on the PCB plate to avoid the inner side sealing part, without bending the inner side sealing part to clamp between the PCB plate and the packaging part, so that the gap for accommodating the inner side sealing part does not need to be arranged between the PCB plate and the packaging part, thereby reducing the distance between the PCB plate and the packaging part, and further reducing the length of the battery pack, so as to improve the energy density of the battery pack, thereby prolonging the service life of the power utilization equipment of the embodiment.

[0031] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0032] The application will be further described below in conjunction with the drawings and embodiments, wherein:

[0033] Figure 1 The structure schematic diagram of the first battery pack of the first aspect embodiment of the application;

[0034] Figure 2 The structure schematic diagram of the soft package battery in the first aspect embodiment of the application; Figure 1 The enlarged view of the A area in the first aspect embodiment of the application;

[0035] Figure 3 The structure schematic diagram of the soft package battery in the first aspect embodiment of the application; Figure 1 The enlarged view of the B area in the first aspect embodiment of the application;

[0036] Figure 4 The enlarged view of the B area in the first aspect embodiment of the application; Figure 3 The enlarged view of the B area in the first aspect embodiment of the application;

[0037] Figure 5 The structure schematic diagram of the soft package battery in the first aspect embodiment of the application; Figure 1 The structure schematic diagram of the soft package battery in the first aspect embodiment of the application;

[0038] Figure 6 The structure schematic diagram of the soft package battery in the first aspect embodiment of the application; Figure 5 The enlarged view of the C area in the first aspect embodiment of the application;

[0039] Figure 7 The partial schematic diagram of the inner side sealing part in the second battery pack of the first aspect embodiment of the application;

[0040] Figure 8 The structure schematic diagram of the soft package battery in the third battery pack of the first aspect embodiment of the application;

[0041] Figure 9 The structure schematic diagram of the soft package battery in the third battery pack of the first aspect embodiment of the application;Figure 8 Enlarged view of the middle D region;

[0042] Figure 10 For Figure 9 Structure schematic diagram of the first folding part when folded;

[0043] Figure 11 For Structure schematic diagram of the first folding part when not folded;

[0044] Figure 12 Figure 11 For Structure schematic diagram of the first folding part when folded;

[0045] Figure 13 For

[0046] Structure schematic diagram of the first folding part when folded; Figure 14 Figure 13 For

[0047] Structure schematic diagram of the first folding part when folded; Figure 15 Figure 9 For

[0048] Structure schematic diagram of the first folding part when folded; Figure 16

[0049] For Figure 17 Structure schematic diagram of the second folding part when not folded; Figure 16

[0050] For Figure 18 Structure schematic diagram of the first folding part when folded; Figure 16

[0051] For Figure 19 Structure schematic diagram of the first folding part when folded;

[0052] Figure 20 For Figure 19 Structure schematic diagram of the soft package battery;

[0053] Figure 21 For Figure 20 Enlarged view of the middle E region;

[0054] Figure 22 Figure 1 Side view of the soft package battery and the PCB board;

[0055] Figure 23 For Figure 19 Side view of the soft package battery and the PCB board;

[0056] Figure 24 a schematic view of the tip portion after being cut;

[0057] Figure 25 a schematic view of the tip portion after being cut; Figure 24 a schematic view of the middle top edge portion and the side edge portion unfolded;

[0058] Figure 26 a schematic view of the tip portion formed by the inner side edge portion and the top edge portion;

[0059] Figure 27 a schematic view of the tip portion after being cut; Figure 26 a schematic view of the middle top edge portion and the side edge portion unfolded.

[0060] Reference signs:

[0061] soft package battery 100, shell 101, packaging portion 110, first surface 111, side edge portion 120, inner side edge portion 130, first edge 1301, second edge 1302, third edge 1303, third surface 131, second avoiding slot 132, second inner wall surface 1321, fourth surface 133, first folding portion 134, fifth surface 135, first crease 1351, second crease 1352, first end point 1353, second end point 1354, folding gap 136, second folding portion 137, third avoiding slot 138, top edge portion 140, extension portion 141, fourth avoiding slot 1411;

[0062] PCB board 200, first board body 201, second board body 202, second surface 210, first avoiding slot 220, first inner wall surface 221. DETAILED DESCRIPTION

[0063] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which the same or similar components have the same or similar reference numbers throughout the drawings and a detailed description of the same or similar components is not repeated. The embodiments described below with reference to the accompanying drawings are exemplary and are for the purpose of explaining the present application only and should not be understood as limiting the present application.

[0064] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings and is only for the purpose of facilitating the description of the present application and simplifying the description, and therefore should not be understood as indicating or implying that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application.

[0065] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0066] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0067] In order to improve the performance of the battery, two batteries are connected together in series and parallel to form a battery pack, and the specific structure is that a PCB board is arranged at the top sealing edge of the soft package battery, and the positive and negative pole ears of the two soft package batteries are welded on the same PCB board and then packaged. In order to avoid the interference between the side sealing edge between the soft package batteries and the PCB, the prior art usually includes two setting methods, one is to arrange the PCB board parallel to the top sealing edge, the thickness of the PCB board corresponds to the length of the soft package battery, and the part of the side sealing edge protruding from the top sealing edge is bent and arranged to be attached to the top sealing edge, so that the part of the side sealing edge protruding is clamped between the PCB board and the top sealing edge, but this will increase the distance between the PCB board and the top sealing edge. The other way is to arrange the PCB board perpendicular to the top sealing edge, the width of the PCB board corresponds to the length of the soft package battery, and the PCB board is located at the top of the side sealing edge, and this way will also increase the length of the battery pack.

[0068] Therefore, no matter which way is used, the length of the battery pack will be increased, which reduces the energy density of the battery pack.

[0069] Based on the above problems, the present application provides a battery pack with high energy density, referring to Figure 1 and Figure 2 , Figure 1 is a structural schematic diagram of the first battery pack of the first embodiment of the first aspect of the present application, Figure 2 is Figure 1 an enlarged view of area A in the above, the battery pack of the present embodiment includes a soft package battery 100 and a PCB board 200.

[0070] The battery pack comprises a plurality of soft package batteries 100, the soft package batteries 100 have a set length, width and thickness, the plurality of soft package batteries 100 are arranged along the width direction and are electrically connected in series or in parallel through a PCB board 200. Specifically, the soft package battery 100 comprises an outer shell 101 and a battery core, the outer shell 101 is made of an aluminum plastic film, but is not limited to the aluminum plastic film, the outer shell 101 comprises a packaging portion 110 and a side sealing edge portion 120, the packaging portion 110 has a receiving cavity for accommodating an electrolyte and the battery core, along the width direction of the soft package battery 100, the two sides of the packaging portion 110 opposite to each other are provided with the side sealing edge portion 120, wherein the side sealing edge portion 120 between the adjacent packaging portions 110 is an inner side sealing edge portion 130, for example, each inner side sealing edge portion 130 extends along the thickness direction of the soft package battery 100, but is not limited thereto, and can also have a certain angle with the thickness direction of the soft package battery 100, as long as the inner side sealing edge portion 130 is folded towards the packaging portion 110 and located between the adjacent packaging portions 110. The packaging portion 110 has a first surface 111 at one end in the length direction of the soft package battery 100. The battery core comprises a battery core body and a tab, the battery core body comprises an anode sheet, a cathode sheet and a separator, the anode sheet, the separator and the cathode sheet are stacked and wound to form the battery core body, and the battery core body is located in the receiving cavity. The tab is connected to the battery core body, the positive tab is connected to the cathode sheet, and the negative tab is connected to the anode sheet, and each tab protrudes from the first surface 111 (i.e. the side surface provided with the top sealing edge portion 140) of the packaging portion 110 along the length direction of the soft package battery 100. The PCB board 200 is located on the first surface 111 of the packaging portion 110, the PCB board 200 has two second surfaces 210 opposite to each other along the thickness direction of the PCB board 200, one of the second surfaces 210 faces the first surface 111, i.e. the thickness direction of the PCB board 200 corresponds to the length direction of the soft package battery 100. The tabs of each soft package battery 100 are electrically connected to the PCB board 200, thereby realizing the series or parallel connection between the soft package batteries 100, for example, the positive tabs of each adjacent soft package battery 100 are electrically connected to the positive tabs, and the negative tabs are electrically connected to the negative tabs, so as to make the battery cores in parallel. When the positive tab of one soft package battery 100 is connected to the negative tab of another soft package battery 100 among the two adjacent soft package batteries 100, the series connection of the soft package batteries 100 is realized.

[0071] Specifically, in the present embodiment, the thickness direction of the PCB plate 200 corresponds to the length direction of the soft package battery 100, and it can be known that the thickness of the PCB plate 200 is obviously smaller than the width, so that the thickness of the PCB plate 200 corresponds to the length of the soft package battery 100, which can make the battery pack have a smaller length (the size along the length direction of the soft package battery 100) compared with the case where the width of the PCB plate 200 corresponds to the length of the soft package battery 100. In addition, the PCB plate 200 is provided with the first empty slot 220, and the inner side edge portion 130 can extend into the first empty slot 220, so as to avoid the interference between the PCB plate 200 and the inner side edge portion 130, without the need to bend part of the inner side edge portion 130 to be clamped between the PCB plate 200 and the packaging portion 110, thereby reducing the distance between the PCB plate 200 and the packaging portion 110, and further reducing the length of the battery pack, so as to improve the energy density of the battery pack of the present embodiment.

[0072] It should be noted that the accompanying Figure 1 The battery pack in the present embodiment has only two soft package batteries 100, which cannot be interpreted as the only limitation of the present embodiment. The battery pack can also include three, four, or five soft package batteries 100, or any number of soft package batteries 100, and the soft package batteries 100 in adjacent battery packs are not limited to being in parallel or in parallel, but can be in parallel and in series, or in parallel and in series at the same time. For example, the battery pack has ABC three soft package batteries 100, of which AB two soft package batteries 100 are in series, and BC two soft package batteries 100 are in parallel.

[0073] In addition, in the above, the second surface 210 of the PCB plate 200 faces the first surface 111 of the packaging portion 110, which cannot be interpreted as that the first surface 111 and the second surface 210 are arranged in parallel. The second surface 210 can not only be arranged in parallel with the first surface 111, but also form a small angle with the first surface 111. For example, the angle between the first surface 111 and the second surface 210 is 0-10°, as long as the space occupied by the PCB plate 200 in the length direction of the soft package battery 100 is smaller than the case where the width of the PCB plate 200 corresponds to the length of the soft package battery 100.

[0074] Referring to Figures 1 to 6 , Figure 3 For Figure 1 the structure diagram of the soft package battery in the present embodiment, Figure 4 For Figure 3 the enlarged diagram of the B region in the present embodiment, Figure 5 For Figure 1 another perspective view, Figure 6 For Figure 5 the enlarged diagram of the C region in the present embodiment, in some embodiments, in the thickness direction of the soft package battery 100, the inner side edge portion 130 has a third surface 131 close to the PCB plate 200, and the inner side edge portion 130 has a second empty slot 132 (as shown inFigure 4 As shown, the second clearance groove 132 can be any shape, such as a rectangular groove, a circular groove, or a triangular groove. The second clearance groove 132 extends through the inner sealing edge 130 along the width direction of the soft-pack battery 100 and extends to the third surface 131. A portion of the PCB board 200 extends into the second clearance groove 132. Therefore, in the thickness direction of the soft-pack battery 100, the size of the first clearance groove 220 can be reduced, thereby preventing the PCB board 200 from being too narrow at the location where the second clearance groove 132 is formed, which would affect the current carrying capacity of the PCB board 200. Specifically, the first clearance groove 220 is set as a rectangular groove, but it is not limited to this; the first clearance groove 220 can also be an arc-shaped groove or a V-shaped groove, etc. For example, the PCB board 200 includes a first board body 201 and a second board body 202. The second board body 202 is connected to both sides of the first board body 201 in the width direction of the pouch battery 100, and the second board body 202 protrudes from the first board body 201 from the same side along the thickness direction of the pouch battery 100 to form a rectangular first clearance groove 220. It is understood that, in order to improve the energy density of the battery pack, the PCB board 200 will not protrude from the side of the pouch battery 100 in the thickness direction; therefore, the size of the PCB board 200 is less than or equal to the thickness of the pouch battery 100.

[0075] Specifically, with Figure 6 Taking the example shown, the thickness of the pouch battery 100 is H. Along the thickness direction of the pouch battery 100, the size of the PCB board 200 is Y, the size of the first clearance groove 220 is Y1, the size of the first board body 201 is Y2, the size of the inner sealing edge 130 is W, the size of the inner sealing edge 130 at the second clearance groove 132 is W1, and the size of the second clearance groove 132 is W2. Here, Y1 + Y2 = Y, W1 + W2 = W, and W1 + Y2 ≤ H, thus ensuring that the PCB board 200 does not protrude from the pouch battery 100. As can be seen from the above, within the range of W1 + Y2 ≤ H, the smaller W1 is, the larger Y2 can be set. A larger Y2 means a wider first board body 201. A wider first board body 201 has a stronger current-carrying capacity, meaning a stronger current-carrying capacity for the PCB board 200, and higher strength for the PCB board 200. To illustrate more clearly, this embodiment takes W1+Y2=H as an example. When the inner sealing edge 130 does not have the second clearance groove 132, that is, W2=0 and W1=W, then Y2=HW, denoted as Y. 21 When the inner sealing edge 130 is provided with a second clearance groove 132, i.e. W2 < W, then Y2 = H - W2, denoted as Y. 22 Y 22 >Y 21When the inner sealing edge part 130 is provided with the second emptying groove 132, the width of the first plate body 201 is larger, thereby improving the current carrying capacity of the PCB board 200, reducing the heat generated by the PCB board 200 during operation, and improving the strength of the PCB board 200.

[0076] On the basis of the above-mentioned embodiments, the inner sealing edge part 130 is cut to form the second emptying groove 132, and the size of the second emptying groove 132 in the thickness direction of the soft package battery 100 is 0.3mm to 2mm. Specifically, it can be known from the above-mentioned embodiments that, within a certain range, the larger the size of the second emptying groove 132 in the width direction of the soft package battery 100, the larger the size of the PCB board 200 at the position where the first emptying groove 220 is arranged, that is, the stronger the strength and current carrying capacity of the PCB board 200. However, the larger the second emptying groove 132, the larger the size of the inner sealing edge part 130 that needs to be cut, and the smaller the effective sealing width of the inner sealing edge part 130. Therefore, the size of the second emptying groove 132 is set within a suitable range in the embodiment, that is, the PCB board 200 has sufficient strength and current carrying capacity, and the inner sealing edge part 130 has sufficient effective sealing.

[0077] Referring to Figure 7 , Figure 7 The second battery pack in the first aspect of the present application is shown in the partial view of the inner sealing edge part. In some embodiments, the second emptying groove 132 is formed as a notch on the third surface 131, and the notch has two opposite edges in the length direction of the soft package battery 100. Therefore, when the second emptying groove 132 is formed by cutting, the entire corner of the inner sealing edge part 130 does not need to be cut off, and only a gap capable of accommodating the PCB board 200 needs to be cut, thereby improving the sealing effect of the inner sealing edge part 130 and improving the sealing performance of the shell 101. Further, in some embodiments, the distance between the two edges in the length direction of the soft package battery 100 is a, and the size of the PCB board 200 is b, 0≤a-b≤0.5mm, that is, the gap between the two edges is equal to or slightly larger than the thickness of the PCB board 200, so that the PCB board 200 can be just clamped in the second emptying groove 132, thereby ensuring the effective sealing of the inner sealing edge part 130.

[0078] Referring to Figures 8 to 14 , Figure 8 The third battery pack in the first aspect of the present application is shown in the structural view of the soft package battery, Figure 9 is Figure 8 is the enlarged view of the D area in FIG. 8, Figure 10 is Figure 9 is the structural view of the first folding part when it is folded, Figure 11 is the partial view of the inner sealing edge part in the fourth battery pack in the first aspect of the present application,Figure 12 As Figure 11 A structural schematic diagram of the first folding part not being folded in the soft package battery 100, Figure 13 A partial schematic diagram of the inner sealing edge part in the fifth battery pack according to the first aspect of the present application, Figure 14 As Figure 13 A structural schematic diagram of the first folding part not being folded in the soft package battery 100. In some embodiments, in the length direction of the soft package battery 100, the inner sealing edge part 130 has a fourth surface 133 close to the PCB board 200, and the second air-avoiding groove 132 extends to the fourth surface 133 of the inner sealing edge part 130, that is, the corner of the inner sealing edge part 130 corresponding to the PCB board 200 is directly cut off during processing, or the corner is folded to form the second air-avoiding groove 132. Regardless of whether the cutting form or the corner folding form is adopted, the processing is simpler, thereby improving the processing efficiency. Specifically, taking the cutting as an example, in the present embodiment, the first air-avoiding groove 220 extends to one end of the inner sealing edge part 130 away from the first surface 111, thereby only two edges need to be formed on the inner sealing edge part 130, and the cutting manner is simpler and faster.

[0079] In some embodiments, the inner sealing edge part 130 includes a first folding part 134, the first folding part 134 is folded away from the PCB board 200 to form the second air-avoiding groove 132, without cutting part of the inner sealing edge part 130, thereby improving the sealing effect of the inner sealing edge part 130. Specifically, the inner sealing edge part 130 has two fifth surfaces 135 opposite in the width direction of the soft package battery 100, the edge of the fifth surface 135 intersecting with the third surface 131 is a first edge 1301, the edge of the fifth surface 135 intersecting with the fourth surface 133 is a second edge 1302, and the first folding part is folded on the fifth surface to form a first fold 1351 away from the PCB board. Exemplarily, in some embodiments, one end of the first fold 1351 is located at the first edge 1301, and the other end is located at the second edge 1302, that is, the first folding part 134 is located at the corner of the inner sealing edge part 130 close to the PCB board 200, in other words, the corner of the inner sealing edge part 130 is folded to form the second air-avoiding groove 132 (as shown in Figure 9 and Figure 10 illustrated), not only the processing manner is simpler, but also the inner sealing edge part 130 does not need to be cut, so that the effective sealing effect of the inner sealing edge part 130 is stronger, thereby improving the sealing property of the soft package battery 100.

[0080] In addition, in some embodiments, one end of the first fold 1351 is located at the first edge 1301, and the other end is spaced apart from the second edge, that is, the other end of the first fold 1351 is not on the second edge 1302 (as shown in Figure 11 and Figure 12 illustrated), so that the first folding part 134 is located at the corner of the inner sealing edge part 130 away from the PCB board 200, thereby improving the sealing effect of the inner sealing edge part 130. Figure 12As shown in FIG. 13, the first folding part 134 is a rectangular area (not limited to a rectangle, as long as the end point of the first crease 1351 is spaced apart from the second edge 1302) of the inner sealing edge part 130 close to the PCB plate 200, and after folding, a second avoidance groove 132 with a larger space can be formed. Specifically, since the other end point of the first crease 1351 is not on the second edge 1302, that is, the end point is located in the inner area of the fifth surface 135. Therefore, during processing, the folding gap 136 is first processed in the inner sealing edge part 130. Taking the rectangular structure of the first folding part 134 as an example, the folding gap 136 is processed along the length direction of the soft package battery 100 with the second edge 1302 as the starting end. Finally, the first folding part 134 is folded to form the second avoidance groove 132, so that the second avoidance groove 132 has a larger avoidance space, and the first folding part 134 does not need to be cut off, thereby improving the sealing effect of the inner sealing edge part 130. Similarly, in some embodiments, one end of the first crease 1351 is located on the second edge 1302, and the other end is spaced apart from the first edge 1301 (as shown in FIG. 14), which will not be described here. Figure 13 and Figure 14 .

[0081] Referring to Figure 15 , Figure 15 as Figure 9 FIG. 15 is a structural schematic view of the inner sealing edge part and the PCB plate in FIG. 13. In the above embodiment, when one end of the first crease 1351 is located on the first edge 1301 and the other end is located on the second edge 1302, in the thickness direction of the soft package battery 100, the first avoidance groove 220 has a first inner wall surface 221 facing the inner sealing edge part 130, and the first inner wall surface 221 is inclinedly arranged towards the first folding part 134 in the direction from the soft package battery to the PCB plate. In the thickness direction of the soft package battery 100, the first avoidance groove 220 has a first inner wall surface 221 facing the inner sealing edge part 130, and the first inner wall surface 221 is inclinedly arranged towards the first folding part 134 in the direction from the soft package battery to the PCB plate, that is, the first inner wall surface 221 is arranged as an inclined surface matching the inclination degree of the second crease 1352, so that the cross section of the PCB plate 200 in the thickness direction gradually increases, thereby improving the strength of the PCB plate 200. In addition, it can be understood that the area of the second surface 210 of the PCB plate 200 away from the soft package battery 100 is greater than the area of the second surface 210 of the PCB plate 200 facing the soft package battery 100. Based on this, the PCB plate 200 includes a circuit, and the circuit is arranged on the second surface 210 of the PCB plate 200 away from the soft package battery 100, thereby increasing the area of the circuit, and further improving the current carrying capacity of the PCB plate 200, so as to reduce the temperature rise of the PCB plate 200.

[0082] Referring to Figure 16 and Figure 17 ,Figure 16 FIG. 6 is a partial schematic view of the inner sealing edge portion of the sixth battery pack according to the first aspect of the present application, Figure 17 FIG. 7 is a partial schematic view of the inner sealing edge portion of the seventh battery pack according to the first aspect of the present application, Figure 16 FIG. 8 is a schematic view of the structure of the second folding portion of the inner sealing edge portion according to the seventh battery pack of the first aspect of the present application, in some embodiments, the inner sealing edge portion 130 has two fifth surfaces 135 facing away from the width direction of the soft-pack battery 100, in the thickness direction of the soft-pack battery 100, the second hollow groove has a second inner wall surface 1321 facing the PCB 200, the edge of the fifth surface 135 intersecting the second inner wall surface 1321 is a third edge 1303, the inner sealing edge portion further includes a second folding portion, the second folding portion is folded away from the PCB to form a third hollow groove communicating with the second hollow groove, and a second crease is formed on the fifth surface, one end of the second crease is located at the second edge 1302, and the other end is located at the third edge 1303. The line segment of the third edge 1303 is a second crease 1352, that is, the second folding portion 137 of the inner sealing edge portion 130 is folded on the basis of the second hollow groove 132 (as shown in FIG. 8) to increase the hollow space of the inner sealing edge portion 130. Figure 16 Therefore, the present scheme increases the hollow space of the inner sealing edge portion 130 on the basis of the second hollow groove 132 formed in the inner sealing edge portion 130 without cutting the inner sealing edge portion 130, thereby further increasing the hollow space of the inner sealing edge portion 130 under the premise of ensuring the effective sealing of the inner sealing edge portion 130, further reducing the size of the first hollow groove 220, and further increasing the width of the PCB 200 at the position provided with the first hollow groove 220, thereby improving the current carrying capacity of the PCB 200.

[0083] Specifically, the side of the inner sealing edge portion 130 close to the PCB 200 along the second crease 1352 is the second folding portion 137, and the other side is a third portion 1305. The second folding portion 137 is folded along the second crease 1352 to form an included angle β between the second folding portion 137 and the third portion 1305, 0≤β≤90°. When β=0, the second folding portion 137 is attached to the third portion 1305, and when β=90°, the second folding portion 137 extends along the width direction of the soft-pack battery 100, which increases the occupied space of the inner sealing edge portion 130 in the width direction of the soft-pack battery 100, thereby increasing the size of the first hollow groove 220 in the width direction of the soft-pack battery 100. Therefore, preferably, β=0, and at this time, the occupied space of the inner sealing edge portion 130 in the thickness direction of the soft-pack battery 100 is only twice the thickness of the inner sealing edge portion 130, thereby reducing the size of the first hollow groove 220 and further improving the strength of the PCB 200.

[0084] Further, the second folding portions 137 of the two adjacent soft package batteries 100 are arranged in directions away from each other, so that the fifth surfaces 135 of the inner edge portions 130 of the two adjacent soft package batteries 100 face each other and are attached to each other, and the second folding portions 137 after being folded do not form protruding portions on the fifth surfaces 135 of the two adjacent soft package batteries 100, so that the battery pack does not form gaps between the soft package batteries 100, and the width of the battery pack is reduced.

[0085] With reference to Figure 18 , Figure 18 For Figure 16 FIG. 6 is a structural schematic view of an inner edge portion and a PCB board in the battery pack 100 according to the embodiment. In the embodiment, one end of the second crease 1352 is located at the end of the second edge 1302 away from the PCB board 200, and the angle between the second crease 1352 and the length direction of the soft package battery 100 is α, 35°≤α≤70°. Specifically, for the convenience of description, the end point of the second crease 1352 at the second edge 1302 is referred to as the first end point 1353, and the end point at the third edge 1303 is referred to as the second end point 1354. Under the premise that the first end point 1353 is fixed, the smaller the angle α is, the farther the second end point 1354 is away from the fourth surface 133, that is, the larger the avoiding space formed by the inner edge portion 130 is. However, when the second end point 1354 is too far away from the fourth surface 133, that is, the size of the second avoiding groove 132 in the length direction of the soft package battery 100 is larger, the area of the inner edge portion 130 that needs to be cut is larger, and the larger the cutting area of the inner edge portion 130 is, the lower the effective sealing of the inner edge portion 130 is. Therefore, in the embodiment, the angle α is set in a proper range, that is, under the premise of ensuring the effective sealing of the inner edge portion 130, the inner edge portion 130 has a larger avoiding space, so that the current carrying capacity of the PCB board 200 is improved, and the temperature rise of the PCB board 200 is reduced.

[0086] With reference to Figure 18As can be seen from the above embodiments, the second crease 1352 is arranged obliquely relative to the length direction of the soft package battery 100, and the thickness direction of the PCB plate 200 corresponds to the length direction of the soft package battery 100, so that the second folding part 137 forms an inclined surface toward the surface of the PCB plate 200 after being folded. Based on this, in some embodiments, the first avoidance groove 220 has a first inner wall surface 221 facing the inner side sealing part 130, and the first inner wall surface 221 is arranged obliquely toward the second folding part 137 in the direction from the soft package battery 100 to the PCB plate 200, that is, the first inner wall surface 221 is arranged as an inclined surface matching the oblique degree of the second crease 1352, so that the cross section of the PCB plate 200 along the thickness direction gradually increases, thereby improving the strength of the PCB plate 200. In addition, it can be understood that the area of the second surface 210 of the PCB plate 200 away from the soft package battery 100 is greater than the area of the second surface 210 of the PCB plate 200 facing the soft package battery 100. Based on this, in some embodiments, the PCB plate 200 includes a circuit, and the circuit is arranged on the second surface 210 of the PCB plate 200 away from the soft package battery 100, thereby increasing the area of the circuit and further improving the current carrying capacity of the PCB plate 200 to reduce the temperature rise of the PCB plate 200.

[0087] With reference to Figure 19 and 17 , Figure 19 FIG. 1 is a structural schematic diagram of a battery pack according to a first embodiment of the present application, Figure 20 FIG. 2 is a structural schematic diagram of a soft package battery in Figure 19 In some embodiments, the outer shell 101 further includes a top sealing part 140, which is connected to the first surface 111 and is arranged to be folded toward the first surface 111, thereby reducing the space occupied by the top sealing part 140 in the length direction of the soft package battery to improve the energy density of the battery pack of the present embodiment.

[0088] Further, since the top sealing part 140 is folded with the packaging part 110 in the embodiments, the interference between the top sealing part 140 and the PCB plate 200 in the thickness direction of the soft package battery can be reduced, so that the width of the PCB plate 200 can be larger. Specifically, it can be understood that when the top sealing part 140 is in an unfolded state, since the top sealing part 140 protrudes from the first surface 111 of the packaging part 110, the edge of the PCB plate 200 will be in abutment with the top sealing part 140 in the thickness direction of the soft package battery, thereby forming a certain constraint on the width of the PCB plate 200. Taking the thickness of the top sealing part 140 as h1 for example, as shown in Figure 22 Figure 22 Figure 1 ​The side view of the soft-pack battery and the PCB board requires that Y+h1≤H, i.e., Y≤H-h1. Furthermore, in some embodiments, the connection between the sealing edge of the soft-pack battery (the collective term for the side sealing edge 120 and the top sealing edge 140) and the encapsulation part 110 is at a certain distance from the surface of the encapsulation part 110 in the thickness direction. Taking the distance between the top sealing edge 140 and a surface of the encapsulation part 110 in the thickness direction as h2 as an example, in this case, Y+h1+h2≤H, i.e., Y≤H-h1-h2. In this embodiment, the top sealing edge 140 is folded towards the encapsulation part 110. Whether the top sealing edge 140 is flush with the surface of the encapsulation part 110 in the thickness direction or at a certain distance, the edge of the PCB board 200 will not abut against the top sealing edge 140. Figure 23 As shown, Figure 23 for Figure 19 The side view of the soft-pack battery and the PCB board shows that only Y≤H needs to be satisfied, which can increase the width of the PCB board 200, thereby improving the current carrying capacity and strength of the PCB board 200.

[0089] Reference Figure 20 and Figure 21 , Figure 21 for Figure 20 The enlarged schematic diagram of region E shows that, based on the above embodiment, the top sealing edge 140 is curved away from the first surface 111 on the side near the inner sealing edge 130, and extends to the fifth surface 135 of the inner sealing edge 130 to form an extension 141. The extension 141 has a fourth clearance groove 1411, and the first sidewall extends into the fourth clearance groove 1411. Specifically, the principle and function of the fourth clearance groove 1411 in the extension 141 are similar to those of the second clearance groove 132 in the inner sealing edge 130 in the above embodiment, and will not be repeated here.

[0090] Furthermore, referring to Figure 24 , Figure 24 This is a schematic diagram of the tip portion after cutting. In some embodiments, a tip portion 150 is formed at the connection between the top sealing edge portion 140 and the side sealing edge portion 120. One end of the tip portion 150 away from the encapsulation portion 110 is cut along the thickness direction of the soft-pack battery to form a clearance area 151, thereby reducing the space occupied by the tip portion 150 in the length direction of the soft-pack battery and thus improving the energy density of the soft-pack battery.

[0091] It should be noted that the clearance area 151 formed by the cutting can be cut at the corner where the side sealing edge 120 and the top sealing edge 140 intersect, before the tip portion 150 is formed, that is, before the side sealing edge 120 and the top sealing edge 140 are folded. For example, a square cutting area 160 can be formed at the corner where the side sealing edge 120 and the top sealing edge 140 intersect. Figure 25 As shown, Figure 25For Figure 24 The schematic diagram of the inner side sealing edge and the top sealing edge before being folded, and then the soft package battery is folded, or the soft package battery is folded to form the pointed end portion 150, and then the pointed end portion 150 is cut. In addition, for the inner side sealing edge 130 and the top sealing edge 140, since they have the avoidance area 151 on the basis of the second avoidance groove 132 and the fourth avoidance groove 1411, as shown in Figure 26 Figure 26 The structure schematic diagram of the inner side sealing edge and the top sealing edge forming the pointed end portion, therefore, the cutting area of the inner side sealing edge 130 and the top sealing edge 140 before being folded is L-shaped, as shown in Figure 27 Figure 27 Figure 26 The schematic diagram of the inner side sealing edge and the top sealing edge before being folded.

[0092] Figures 24 to 27 The dotted line cannot be explained as the actual contour line of the soft package battery, and is only used to clearly show the avoidance area 151, the second avoidance groove 132, the fourth avoidance groove 1411 and the cutting area 160.

[0093] In some embodiments, the size of the first avoidance groove 220 is 1.5mm to 3mm along the thickness direction of the soft package battery 100. Specifically, the first avoidance groove 220 is used to avoid the inner side sealing edge 130. If the size of the first avoidance groove 220 is too small, the size of the inner side sealing edge 130 will be too small, which is not conducive to the sealing of the shell 101. If the size of the first avoidance groove 220 is too large, the width of the PCB board 200 at the first avoidance groove 220 will be too small, for example, the width of the first plate body 201 in the above embodiment is too small, which leads to the current carrying capacity of the PCB board 200 being too small. Therefore, in this embodiment, the size of the first avoidance groove 220 is set in a suitable range, which ensures the sealing of the shell 101 and makes the PCB board 200 have a strong current carrying capacity.

[0094] ​​​According to the second aspect of the application, the power device comprises the battery pack of the first aspect, the PCB 200 in the battery pack is arranged towards the first surface 111 of the packaging portion 110, that is, the thickness of the PCB 200 corresponds to the length of the soft package battery 100, and since the PCB 200 is provided with the first avoiding slot 220, the inner side edge portion 130 can extend into the first avoiding slot 220, so as to avoid the interference between the PCB 200 and the inner side edge portion 130. Therefore, compared with the prior art, in the embodiment, the thickness of the PCB corresponds to the length of the soft package battery 100, the increase of the width of the battery pack caused by the width of the PCB is avoided, and the first avoiding slot 220 is arranged on the PCB 200 to avoid the inner side edge portion 130, without the need of bending the inner side edge portion 130 to be clamped between the PCB 200 and the packaging portion 110, so that the gap for accommodating the inner side edge portion 130 between the PCB 200 and the packaging portion 110 is not needed, the distance between the PCB 200 and the packaging portion 110 is reduced, the length of the battery pack is reduced, the energy density of the battery pack is improved, and the service life of the power device of the embodiment is improved.

[0095] It should be noted that since the battery pack of the embodiment adopts all the technical features of the battery pack of the first aspect, the embodiment has all the beneficial effects brought by the first aspect, which will not be described here.

[0096] The embodiments of the application are described in detail above with reference to the drawings, but the application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application. In addition, in the description of the application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application. In the specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A battery pack, characterized by, The application relates to a soft package battery, a PCB plate and a soft package battery and a PCB plate. The soft package battery comprises a plurality of soft package batteries distributed along the width direction of the soft package battery, the soft package battery comprising a shell and an electric core, the shell comprising a packaging part and a side sealing edge part, the electric core being located in the packaging part, the two sides of the packaging part opposite to each other along the width direction of the soft package battery being provided with the side sealing edge part, the side sealing edge part located between the adjacent packaging parts being an inner side sealing edge part, one end of the packaging part in the length direction of the soft package battery having a first surface; The PCB plate is located at one end in the length direction of the soft package battery, the inner side sealing edge part protruding towards the PCB plate relative to the first surface, the PCB plate having two second surfaces opposite to each other along the thickness direction of the PCB plate, one of the second surfaces facing the first surface, each of the soft package batteries being electrically connected to the PCB plate, the PCB plate having a first emptying groove, part of the inner side sealing edge part extending into the first emptying groove; The inner side sealing edge part has a third surface facing the PCB plate along the thickness direction of the soft package battery, the inner side sealing edge part having a second emptying groove, the second emptying groove penetrating the inner side sealing edge part along the width direction of the soft package battery and extending to the third surface, part of the PCB plate extending into the second emptying groove.

2. The battery pack of claim 1, wherein, The second emptying groove forms a notch at the third surface, the notch having two mouth edges opposite to each other along the length direction of the soft package battery.

3. The battery pack of claim 1, wherein, In the length direction of the soft package battery, the inner side sealing edge part has a fourth surface close to the PCB plate, the second emptying groove extending to the fourth surface.

4. The battery pack of claim 3, wherein, The inner side sealing edge part comprises a first folding part, the first folding part being folded away from the PCB plate to form the second emptying groove.

5. The battery pack of claim 4, wherein, The inner side sealing edge part has two fifth surfaces opposite to each other along the width direction of the soft package battery, an edge of the fifth surface intersecting with the third surface being a first edge, an edge of the fifth surface intersecting with the fourth surface being a second edge, the first folding part forming a first crease at the fifth surface; One end of the first crease is located at the first edge, and the other end is located at the second edge; or, One end of the first crease is located at the first edge, and the other end is spaced from the second edge; or, One end of the first crease is located at the second edge, and the other end is spaced from the first edge.

6. The battery pack of claim 5, wherein, One end of the first crease is located at the first edge, and the other end is located at the second edge, the first emptying groove having a first inner wall surface facing the inner side sealing edge part along the thickness direction of the soft package battery, the first inner wall surface being obliquely arranged towards the first folding part along the direction from the soft package battery to the PCB plate.

7. The battery pack of claim 3, wherein, The inner side sealing edge part has two fifth surfaces opposite to each other along the width direction of the soft package battery, the second emptying groove having a second inner wall surface facing the PCB plate along the thickness direction of the soft package battery, an edge of the fifth surface intersecting with the fourth surface being a second edge, an edge of the fifth surface intersecting with the second inner wall surface being a third edge; The inner side sealing edge portion further comprises a second folding portion, which is folded away from the PCB board to form a third air-avoiding groove in communication with the second air-avoiding groove, and a second crease formed on the fifth surface, one end of the second crease being located at the second edge and the other end being located at the third edge.

8. The battery pack of claim 7, wherein, One end of the second crease is located at one end of the second edge away from the PCB board, and the included angle between the second crease and the length direction of the soft package battery is α, 35° < α ≤ 70°.

9. The battery pack of claim 7, wherein, In the thickness direction of the soft package battery, the first air-avoiding groove has a first inner wall surface facing the inner side sealing edge portion, which is inclined towards the second folding portion in the direction from the soft package battery to the PCB board.

10. The battery pack of claim 9, wherein, The PCB board has a circuit electrically connected with the soft package battery, and the circuit is located on the second surface of the PCB board away from the soft package battery.

11. The battery pack of claim 1, wherein, The shell further comprises a top sealing edge portion connected to the first surface and folded towards the first surface.

12. The battery pack of claim 11, wherein, In the length direction of the soft package battery, the inner side sealing edge portion has a fourth surface close to the PCB board, and the top sealing edge portion extends away from the first surface on the side close to the inner side sealing edge portion and extends to the fourth surface to form an extension portion, the extension portion having a fourth air-avoiding groove, and the PCB board extends into the fourth air-avoiding groove.

13. The battery pack of claim 1, wherein, In the thickness direction of the soft package battery, the size of the first air-avoiding groove is 1.5 mm to 3 mm.

14. The battery pack of claim 1, wherein, The inner side sealing edge portion cuts to form the second air-avoiding groove, and in the thickness direction of the soft package battery, the size of the second air-avoiding groove is 0.3 mm to 2 mm.

15. An electrical device, characterized by The battery pack comprises the battery pack according to any one of claims 1 to 14. The battery pack comprises the battery pack according to any one of claims 1 to 14.

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