Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment. The battery pack comprises a soft package battery and a PCB (Printed Circuit Board), a plurality of soft package batteries are distributed in the width direction of the soft package batteries, each soft package battery comprises a shell and a battery cell, each shell comprises a packaging part and side edge sealing parts, the battery cells are located in the packaging parts, the side edge sealing parts are connected to the two opposite sides of the packaging parts in the width direction of the soft package batteries, and the side edge sealing parts between the adjacent packaging parts are inner side edge sealing parts. One end of the packaging part in the length direction of the soft package battery is provided with a first surface; the PCB is located on the first surface of the soft package battery, the inner side edge sealing part protrudes towards the PCB relative to the first surface, the PCB is provided with second surfaces opposite to each other in the thickness direction of the PCB, one second surface faces the first surface, the PCB is provided with a first receding groove, and the first receding groove is communicated with the first receding groove. The part of the inner side edge sealing part extends into the first clearance groove, so that the distance between the PCB and the packaging part is reduced, the length of the battery pack is reduced, and the energy density of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack and electrical equipment. Background Art

[0002] In order to improve the performance of the battery, two batteries are connected together in series and parallel to form a battery pack. The specific structure is that a PCB board is set at the top seal of the soft-pack battery, and the positive and negative tabs of the two soft-pack batteries are welded to the same PCB board before packaging. In order to avoid the interference between the side seals and the PCB between the soft-pack batteries, the existing technology generally includes two settings. One is to set the PCB board parallel to the top seal, the thickness of the PCB board corresponds to the length of the soft-pack battery, and the part of the side seal protruding from the top seal is bent and arranged to fit the top seal, so that the protruding part of the side seal is clamped between the PCB board and the top seal, but this method will increase the distance between the PCB board and the top seal. Another method is to set the PCB board perpendicular to the top seal, the width of the PCB board corresponds to the length of the soft-pack battery, and the PCB board is located on top of the side seal. This method also increases the length of the battery pack.

[0003] It can be seen that no matter which of the above methods is used, the length of the battery pack will increase, thereby reducing the energy density of the battery pack. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a battery pack having a high energy density.

[0005] The utility model also provides an electrical device comprising the battery pack.

[0006] A battery pack according to an embodiment of the first aspect of the present invention includes: a soft-pack battery and a PCB board.

[0007] The battery pack includes a plurality of soft-pack batteries distributed along the width direction of the soft-pack battery, the soft-pack battery includes an outer shell and a battery cell, the outer shell includes a packaging portion and a side sealing portion, the battery cell is located in the packaging portion, and along the width direction of the soft-pack battery, the two opposite sides of the packaging portion are provided with the side sealing portions connected, the side sealing portions located between adjacent packaging portions are inner sealing portions, and the packaging portion has a first surface at one end in the length direction of the soft-pack battery; the PCB board is located at one end in the length direction of the soft-pack battery, the inner sealing portion protrudes toward the PCB board relative to the first surface, the PCB board has two second surfaces opposite to each other along its own thickness direction, one of the second surfaces faces the first surface, each soft-pack battery is electrically connected to the PCB board, and the PCB board has a first air avoidance groove, and part of the inner sealing portion extends into the first air avoidance groove.

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

[0009] In this embodiment, the PCB is arranged on the first surface facing the packaging portion, that is, the thickness of the PCB corresponds to the length of the soft-pack battery, and because the PCB is provided with a first air-avoidance groove, the inner edge seal can extend into the first air-avoidance groove, avoiding interference between the PCB and the inner edge seal. It can be seen that, compared to conventional technologies, in this embodiment, the thickness of the PCB corresponds to the length of the soft-pack battery, avoiding the increase in battery pack length caused by the width of the PCB, and the PCB has a first air-avoidance groove for avoiding the inner edge seal, without requiring the inner edge seal to be bent and clamped between the PCB and the packaging portion. As a result, there is no need to provide a gap between the PCB and the packaging portion to accommodate the inner edge seal, thereby reducing the distance between the PCB and the packaging portion, and further reducing the length of the battery pack, thereby improving the energy density of the battery pack of this embodiment.

[0010] According to some embodiments of the present invention, the inner edge sealing portion has a third surface facing the PCB board along the thickness direction of the soft-pack battery, and the inner edge sealing portion has a second air avoidance groove, which passes through the inner edge sealing portion along the width direction of the soft-pack battery and extends to the third surface, and a portion of the PCB board extends into the second air avoidance groove.

[0011] According to some embodiments of the present invention, the second air-avoiding groove forms a notch on the third surface, and along the length direction of the soft-pack battery, the notch has two edges arranged opposite to each other.

[0012] According to some embodiments of the present invention, in the length direction of the soft-pack battery, the inner edge sealing portion has a fourth surface close to the PCB board, and the second air avoidance groove extends to the fourth surface.

[0013] According to some embodiments of the present invention, the inner edge seal includes a first folding portion, and the first folding portion is folded away from the PCB board to form the second air avoidance groove.

[0014] According to some embodiments of the present invention, the inner edge sealing portion has two fifth surfaces facing each other in the width direction of the soft-pack battery, the edge where the fifth surface intersects with the third surface is the first edge, the edge where the fifth surface intersects with the fourth surface is the second edge, and the first folding portion forms a first fold on the fifth surface;

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

[0016] One end of the first fold is located at the first edge, and the other end is spaced apart from the second edge; or

[0017] One end of the first fold is located at the second edge, and the other end is spaced apart from the first edge.

[0018] According to some embodiments of the present invention, one end of the first fold is located at the first edge, and the other end is located at the second edge. In the thickness direction of the soft-pack battery, the first air avoidance groove has a first inner wall surface facing the inner edge sealing portion, and along the direction from the soft-pack battery to the PCB board, the first inner wall surface is inclined toward the first folding portion.

[0019] According to some embodiments of the present invention, the inner edge sealing portion has two fifth surfaces opposite to each other along the width direction of the soft-pack battery, and in the thickness direction of the soft-pack battery, the second air avoidance groove has a second inner wall surface facing the PCB board, the edge where the fifth surface intersects with the fourth surface is the second edge, and the edge where the fifth surface intersects with the second inner wall surface is the third edge;

[0020] The inner edge sealing portion also includes a second folding portion, which is folded away from the PCB board to form a third air avoidance groove connected to the second air avoidance groove, and forms a second fold on the fifth surface, one end of the second fold is located at the second edge, and the other end is located at the third edge.

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

[0022] According to some embodiments of the present invention, in the thickness direction of the soft-pack battery, the first air avoidance groove has a first inner wall surface facing the inner edge sealing portion, and along the direction from the soft-pack battery to the PCB board, the first inner wall surface is inclined toward the second folding portion.

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

[0024] According to some embodiments of the present invention, the shell further includes a top sealing edge portion, which is connected to the first surface and folded toward the first surface.

[0025] According to some embodiments of the present invention, in the length direction of the soft-pack battery, the inner edge sealing portion has a fourth surface close to the PCB board, and the side of the top edge sealing portion close to the inner edge sealing portion is bent away from the first surface and extends to the fourth surface to form an extension portion, and the extension portion has a fourth air avoidance groove, and the PCB board extends into the fourth air avoidance groove.

[0026] According to some embodiments of the present invention, along the thickness direction of the soft-pack battery, the size of the first air-avoiding groove is 1.5 mm to 3 mm.

[0027] According to some embodiments of the present invention, the inner edge sealing portion is cut to form the second air avoidance groove, and along the thickness direction of the soft-pack battery, the size of the second air avoidance groove is 0.3 mm to 2 mm.

[0028] According to the second embodiment of the present invention, the electric device includes: the battery pack described in the first embodiment.

[0029] The electrical equipment according to the embodiment of the present utility model has at least the following beneficial effects:

[0030] In a battery pack using the embodiment of the first aspect, the PCB board in the battery pack is arranged toward the first surface of the packaging portion, that is, the thickness of the PCB board corresponds to the length of the soft-pack battery, and because the PCB board is provided with a first air-avoidance groove, the inner edge sealing portion can extend into the first air-avoidance groove to avoid interference between the PCB board and the inner edge sealing portion. It can be seen that, compared to conventional technology, in this embodiment, the thickness of the PCB corresponds to the length of the soft-pack battery, avoiding the increase in the width of the battery pack caused by the width of the PCB, and the PCB board has a first air-avoidance groove for avoiding the inner edge sealing portion, without the need to bend the inner edge sealing portion and clamp it between the PCB board and the packaging portion. Therefore, there is no need to set a gap between the PCB board and the packaging portion to accommodate the inner edge sealing portion, thereby reducing the distance between the PCB board and the packaging portion, and then reducing the length of the battery pack to increase the energy density of the battery pack, thereby improving the service life of the electrical equipment of this embodiment.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0033] Figure 1 This is a schematic structural diagram of a first battery pack according to an embodiment of the first aspect of the present utility model;

[0034] Figure 2 for Figure 1 Magnified view of area A in the middle;

[0035] Figure 3 for Figure 1 Schematic diagram of the structure of a medium soft pack battery;

[0036] Figure 4 for Figure 3 A magnified schematic diagram of area B in the middle;

[0037] Figure 5 for Figure 1 Schematic diagram from another perspective;

[0038] Figure 6 for Figure 5 Enlarged schematic diagram of the middle C area;

[0039] Figure 7 A partial schematic diagram of the inner edge sealing portion of the second battery pack in the embodiment of the first aspect of the utility model;

[0040] Figure 8 A schematic structural diagram of a soft-pack battery in a third battery pack according to an embodiment of the first aspect of the present invention;

[0041] Figure 9 for Figure 8 Enlarged schematic diagram of region D in the middle;

[0042] Figure 10 for Figure 9 The first folding portion is a schematic diagram of the structure when folded;

[0043] Figure 11 This is a partial schematic diagram of the inner edge sealing portion of the fourth battery pack according to the first embodiment of the present utility model;

[0044] Figure 12 for Figure 11 A schematic diagram of the structure when the first folding portion is not folded;

[0045] Figure 13 This is a partial schematic diagram of the inner edge sealing portion of the fifth battery pack according to the first embodiment of the present utility model;

[0046] Figure 14 for Figure 13 The first folding portion is a schematic diagram of the structure when folded;

[0047] Figure 15 for Figure 9 Schematic diagram of the structure of the inner side edge sealing part and PCB board;

[0048] Figure 16 This is a partial schematic diagram of the inner edge sealing portion of the sixth battery pack according to the first embodiment of the present utility model;

[0049] Figure 17 for Figure 16 A schematic diagram of the structure when the second folding portion is not folded;

[0050] Figure 18 for Figure 16 Schematic diagram of the structure of the inner side edge sealing part and PCB board;

[0051] Figure 19 This is a structural diagram of a seventh battery pack according to the first embodiment of the present utility model;

[0052] Figure 20 for Figure 19 Schematic diagram of the structure of a medium soft pack battery;

[0053] Figure 21 for Figure 20 Enlarged schematic diagram of the middle E area;

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

[0055] Figure 23 for Figure 19 Side view of the medium soft pack battery and PCB board;

[0056] Figure 24 This is a schematic diagram of the tip after cutting;

[0057] Figure 25 for Figure 24 Schematic diagram of the top and side sealing parts when they are not folded;

[0058] Figure 26 A schematic structural diagram of a tip portion formed by an inner edge sealing portion and a top edge sealing portion;

[0059] Figure 27 for Figure 26 Schematic diagram of the inner center and top edge seals when unfolded.

[0060] Reference numerals:

[0061] Soft pack battery 100, housing 101, packaging portion 110, first surface 111, side sealing portion 120, inner sealing portion 130, first edge 1301, second edge 1302, third edge 1303, third surface 131, second air avoidance groove 132, second inner wall surface 1321, fourth surface 133, first folding portion 134, fifth surface 135, first fold 1351, second fold 1352, first endpoint 1353, second endpoint 1354, folding gap 136, second folding portion 137, third air avoidance groove 138, top sealing portion 140, extension portion 141, fourth air avoidance groove 1411;

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

[0063] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0064] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention 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. Therefore, they cannot be understood as limitations on the present invention.

[0065] In the description of this utility model, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the terms "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0066] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on 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. The specific structure is that a PCB board is set at the top seal of the soft-pack battery, and the positive and negative tabs of the two soft-pack batteries are welded to the same PCB board before packaging. In order to avoid the interference between the side seals and the PCB between the soft-pack batteries, the existing technology generally includes two settings. One is to set the PCB board parallel to the top seal, the thickness of the PCB board corresponds to the length of the soft-pack battery, and the part of the side seal protruding from the top seal is bent and arranged to fit the top seal, so that the protruding part of the side seal is clamped between the PCB board and the top seal, but this method will increase the distance between the PCB board and the top seal. Another method is to set the PCB board perpendicular to the top seal, the width of the PCB board corresponds to the length of the soft-pack battery, and the PCB board is located on top of the side seal. This method also increases the length of the battery pack.

[0068] It can be seen that no matter which of the above methods is used, the length of the battery pack will increase, thereby reducing the energy density of the battery pack.

[0069] Based on the above problems, the present invention proposes a battery pack with high energy density. Figure 1 and Figure 2 , Figure 1 This is a schematic structural diagram of a first battery pack according to an embodiment of the first aspect of the present utility model. Figure 2 for Figure 1 The enlarged view of area A in the middle shows that the battery pack of this embodiment includes: a soft-pack battery 100 and a PCB board 200.

[0070] The battery pack includes a plurality of soft-pack batteries 100 . The soft-pack batteries 100 have a set length, width, and thickness. The plurality of soft-pack 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-pack battery 100 includes a shell 101 and a battery cell. The shell 101 is made of, but not limited to, an aluminum-plastic film. The shell 101 includes a packaging portion 110 and a side sealing portion 120. The packaging portion 110 has a cavity for accommodating electrolyte and battery cells. Along the width direction of the soft-pack battery 100, the packaging portion 110 is provided with a side sealing portion 120 on both opposite sides. The side sealing portions 120 located between adjacent packaging portions 110 are inner sealing portions 130. For example, each inner sealing portion 130 extends along the thickness direction of the soft-pack battery 100, but is not limited to this. It can also have a certain angle with the thickness direction of the soft-pack battery 100, as long as the inner sealing portion 130 is folded toward the packaging portion 110 and located between adjacent packaging portions 110. The packaging portion 110 has a first surface 111 at one end in the length direction of the soft-pack battery 100. The battery cell includes a battery cell body and tabs. The battery cell body includes an anode sheet, a cathode sheet, and a separator. The anode sheet, separator, and cathode sheet are stacked and wound to form the battery cell body, and the battery cell body is located in the accommodating cavity. The tabs are connected to the battery cell body, the positive tab is connected to the cathode sheet, and the negative tab is connected to the anode sheet. Each tab protrudes from the first surface 111 of the packaging portion 110 (i.e., the side with the top sealing edge portion 140) along the length direction of the soft-pack 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 facing each other along its own thickness direction, one of which faces the first surface 111. That is, the thickness direction of the PCB board 200 corresponds to the length direction of the soft-pack battery 100. The tabs of each soft-pack battery 100 are electrically connected to the PCB 200, thereby enabling series or parallel connection between the soft-pack batteries 100. For example, the positive tabs of adjacent soft-pack batteries 100 are electrically connected to the positive tabs, and the negative tabs are electrically connected to the negative tabs, so that the cells are connected in parallel. When the positive tab of one of two adjacent soft-pack batteries 100 is connected to the negative tab of the other soft-pack battery 100, the soft-pack batteries 100 are connected in series.

[0071] Specifically, in the present embodiment, the thickness direction of the PCB board 200 corresponds to the length direction of the soft-pack battery 100. It can be seen that for the PCB board 200, its thickness is significantly smaller than its width. Therefore, setting the thickness of the PCB board 200 to correspond to the length of the soft-pack battery 100, compared with setting the width of the PCB board 200 to correspond to the length of the soft-pack battery 100, can make the battery pack have a smaller length (the dimension along the length direction of the soft-pack battery 100). In addition, the PCB board 200 is provided with a first avoidance groove 220, and the inner edge sealing portion 130 can extend into the first avoidance groove 220 to avoid interference between the PCB board 200 and the inner edge sealing portion 130 without partially bending the inner edge sealing portion 130 and clamping it between the PCB board 200 and the packaging portion 110, thereby reducing the distance between the PCB board 200 and the packaging portion 110, thereby reducing the length of the battery pack, thereby improving the energy density of the battery pack of the present embodiment.

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

[0073] In addition, the second surface 210 of the PCB board 200 mentioned above faces the first surface 111 of the packaging part 110, which cannot be interpreted as the first surface 111 and the second surface 210 being arranged in parallel. The second surface 210 can not only be arranged parallel to the first surface 111, but also form a smaller angle with the first surface 111. For example, the angle between the first surface 111 and the second surface 210 is 0 to 10°, as long as the space occupied by the PCB board 200 in the length direction of the soft-pack battery 100 is less than directly corresponding the width of the PCB board 200 to the length of the soft-pack battery 100.

[0074] Reference Figures 1 to 6 , Figure 3 for Figure 1 Schematic diagram of the structure of a medium soft pack battery. Figure 4 for Figure 3 A magnified schematic diagram of area B in the middle. Figure 5 for Figure 1 Another perspective diagram, Figure 6 for Figure 5 In the enlarged schematic diagram of the middle C area, in some embodiments, in the thickness direction of the soft pack battery 100, the inner edge sealing portion 130 has a third surface 131 close to the PCB board 200, and the inner edge sealing portion 130 has a second air-avoiding groove 132 (such as Figure 4 The second avoidance groove 132 may be any shape, such as a rectangular groove, a circular groove, or a triangular groove. The second avoidance groove 132 passes through the inner edge sealing portion 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 avoidance groove 132. As a result, the size of the first avoidance groove 220 can be reduced in the thickness direction of the soft-pack battery 100, thereby preventing the PCB board 200 from being too narrow at the location where the second avoidance groove 132 is provided, thereby preventing the current carrying capacity of the PCB board 200 from being affected. Specifically, the first avoidance groove 220 is configured as a rectangular groove, but is not limited thereto. The first avoidance groove 220 may also be an arc-shaped groove or a V-shaped groove. Exemplarily, the PCB 200 includes a first plate 201 and a second plate 202. The second plate 202 is connected to both sides of the first plate 201 in the width direction of the soft-pack battery 100. The second plate 202 protrudes from the first plate 201 along the thickness direction of the soft-pack battery 100 from the same side of the first plate 201 to form a rectangular first air-avoidance groove 220. It will be appreciated that to improve the energy density of the battery pack, the PCB 200 does not protrude from the side of the soft-pack battery 100 in the thickness direction. Therefore, the size of the PCB 200 is less than or equal to the thickness of the soft-pack battery 100.

[0075] Specifically, Figure 6 As shown in the example, the thickness of the soft-pack battery 100 is H. Along the thickness direction of the soft-pack battery 100, the size of the PCB board 200 is Y, the size of the first air-avoidance groove 220 is Y1, the size of the first plate body 201 is Y2, the size of the inner edge seal 130 is W, the size of the inner edge seal 130 at the second air-avoidance groove 132 is W1, and the size of the second air-avoidance groove 132 is W2. Here, Y1+Y2=Y, W1+W2=W, and W1+Y2≤H, thereby ensuring that the PCB board 200 does not protrude from the soft-pack battery 100. As can be seen from the above, within the range of W1+Y2≤H, the smaller W1 is set, the larger Y2 can be set. The larger Y2 means the wider the first plate body 201, and the wider the first plate body 201, the greater the current carrying capacity of the first plate body 201, that is, the greater the current carrying capacity of the PCB board 200, and the higher the strength of the PCB board 200. For a clearer explanation, this embodiment takes W1+Y2=H as an example. When the inner edge sealing portion 130 is not provided with the second escape groove 132, that is, W2=0, W1=W, and Y2=HW, it is recorded as Y 21 When the inner edge sealing portion 130 is provided with a second air-avoiding groove 132, that is, W2<W, at this time Y2=H-W2, recorded as Y 22 , Y 22 >Y 21That is, when the second air-avoiding groove 132 is provided on the inner edge sealing portion 130, the width of the first board 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] Based on the above embodiment, the inner edge seal 130 is cut to form a second air gap 132. The dimension of the second air gap 132 along the thickness direction of the soft-pack battery 100 is between 0.3 mm and 2 mm. Specifically, as can be seen from the above embodiment, within a certain range, the larger the dimension of the second air gap 132 along the width direction of the soft-pack battery 100, the larger the dimension of the PCB board 200 correspondingly becomes at the location where the first air gap 220 is provided, i.e., the strength and current-carrying capacity of the PCB board 200 increases. However, a larger second air gap 132 also means that the inner edge seal 130 needs to be cut to a larger dimension. The larger the cut dimension, the smaller the effective sealing width of the inner edge seal 130. Therefore, in this embodiment, the dimension of the second air gap 132 is set within an appropriate range, ensuring that the PCB board 200 has sufficient strength and current-carrying capacity while also ensuring that the inner edge seal 130 provides a sufficiently effective seal.

[0077] Reference Figure 7 , Figure 7 A partial schematic diagram of the inner edge seal portion of the second battery pack according to the first embodiment of the present invention is shown. In some embodiments, the second air-avoiding groove 132 forms a notch on the third surface 131. The notch has two opposing edges along the length of the soft-pack battery 100. Therefore, when forming the second air-avoiding groove 132 by cutting, it is not necessary to cut off the entire edge of the inner edge seal 130. Only a gap that can accommodate the PCB board 200 is required. This improves the sealing effect of the inner edge seal 130 and enhances the sealing performance of the outer shell 101. Furthermore, in some embodiments, along the length of the soft-pack battery 100, the distance between the two edges is a, and the size of the PCB board 200 is b, 0≤ab≤0.5mm. That is, the gap between the two edges is equal to or slightly greater than the thickness of the PCB board 200, so that the PCB board 200 can be just stuck in the second air-avoiding groove 132, thereby ensuring that the inner edge seal 130 is effectively sealed.

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

[0079] In some embodiments, the inner edge seal 130 includes a first folded portion 134, which folds away from the PCB 200 to form the second airtight groove 132, eliminating the need to cut away any portion of the inner edge seal 130. This improves the sealing effect of the inner edge seal 130. Specifically, the inner edge seal 130 has two fifth surfaces 135 that face each other in the width direction of the pouch cell 100. The edge where the fifth surface 135 intersects the third surface 131 is a first edge 1301, and the edge where the fifth surface 135 intersects the fourth surface 133 is a second edge 1302. The first folded portion folds away from the PCB to form a first crease 1351 on the fifth surface. For example, 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 portion 134 is located at the corner of the inner edge sealing portion 130 close to the PCB board 200. In other words, the corner of the inner edge sealing portion 130 is folded to form the second avoidance groove 132 (such as Figure 9 and Figure 10 As shown), not only is the processing method simpler, but there is also no need to cut the inner edge sealing portion 130 , so that the effective sealing effect of the inner edge sealing portion 130 is stronger, thereby improving the sealing performance of the soft-pack 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 point of the first fold 1351 is not on the second edge 1302 (e.g., Figure 11 and Figure 12 shown), with Figure 12As shown in the example, the first folded portion 134 is a rectangular area of the inner edge seal 130 close to the PCB board 200 (not limited to a rectangle, as long as the endpoint of the first fold 1351 is spaced apart from the second edge 1302). After folding, a larger second air escape groove 132 is formed. Specifically, because the other endpoint of the first fold 1351 is not at the second edge 1302, that is, it is located in the inner area of the fifth surface 135. Therefore, during processing, the folding gap 136 is first formed in the inner edge seal 130. Taking the first folded portion 134 as a rectangular structure as an example, during processing, starting from the second edge 1302, the folding gap 136 is formed along the length of the soft-pack battery 100. Finally, the first folded portion 134 is folded to form the second air escape groove 132. This provides a larger escape groove 132 and eliminates the need to cut the first folded portion 134, thereby improving the sealing effect of the inner edge seal 130. Similarly, in some embodiments, one end of the first fold 1351 is located at the second edge 1302, and the other end is spaced apart from the first edge 1301 (eg, Figure 13 and Figure 14 shown), which will not be described here.

[0081] Reference Figure 15 , Figure 15 for Figure 9 Schematic diagram of the structure of the inner edge seal and the PCB. In the above embodiment, when 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, the first avoidance groove 220 has a first inner wall surface 221 facing the inner edge seal 130 in the thickness direction of the soft-pack battery 100. Along the direction from the soft-pack battery to the PCB, the first inner wall surface 221 is inclined toward the first folded portion 134. Along the thickness direction of the soft-pack battery 100, the first avoidance groove 220 has a first inner wall surface 221 facing the inner edge seal 130. Along the direction from the soft-pack battery to the PCB, the first inner wall surface 221 is inclined toward the first folded portion 134. That is, the first inner wall surface 221 is configured as an inclined surface that matches the inclination of the second fold 1352. This gradually increases the cross-section of the PCB 200 along its rearward direction, thereby improving the strength of the PCB 200. In addition, it can be understood that the area of the second surface 210 of the PCB board 200 facing away from the soft-pack battery 100 is larger than the area of the second surface 210 of the PCB board 200 facing the soft-pack battery 100. Based on this, the PCB board 200 includes a circuit, and the circuit is arranged on the second surface 210 of the PCB board 200 facing away from the soft-pack battery 100, thereby increasing the area for setting the circuit, and further improving the current-carrying capacity of the PCB board 200, so as to reduce the temperature rise of the PCB board 200.

[0082] Reference Figure 16 and Figure 17 , Figure 16 This is a partial schematic diagram of the inner edge sealing portion of the sixth battery pack in the first embodiment of the utility model. Figure 17 for Figure 16 Schematic diagram of the structure when the second folding portion is not folded. In some embodiments, the inner edge sealing portion 130 has two fifth surfaces 135 facing each other in the width direction of the soft-pack battery 100. In the thickness direction of the soft-pack battery 100, the second air avoidance groove has a second inner wall surface 1321 facing the PCB board 200. The edge where the fifth surface 135 intersects with the second inner wall surface 1321 is the third edge 1303. The inner edge sealing portion also includes a second folding portion, which is folded away from the PCB board to form a third air avoidance groove connected to the second air avoidance groove, and form a second fold on the fifth surface. One end of the second fold is located at the second edge 1302, and the other end is located at the third edge 1303. The line segment is the second fold 1352, that is, the inner edge sealing portion 130 is folded on the basis of having the second air avoidance groove 132 (such as Figure 16 (as shown) to increase the clearance space of the inner edge seal. Therefore, based on the second escape groove 132 formed in the inner edge seal 130, this solution increases the clearance space of the inner edge seal 130 without cutting the inner edge seal 130. While ensuring an effective seal of the inner edge seal 130, the clearance space of the inner edge seal 130 can be further increased, while further reducing the size of the first escape groove 220. This in turn increases the width of the PCB 200 at the location of the first escape groove 220, thereby improving the current-carrying capacity of the PCB 200.

[0083] Specifically, the side of the inner edge sealing portion 130 located at the second fold 1352 close to the PCB board 200 is the second folding portion 137, and the other side is the third portion 1305. The second folding portion 137 is folded along the second fold 1352 to form an angle β between the second folding portion 137 and the third portion 1305, 0≤β≤90°, wherein, when β=0, that is, the second folding portion 137 is in contact with 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 will increase the space occupied by the inner edge sealing portion 130 in the width direction of the soft-pack battery 100, thereby requiring the size of the first air avoidance groove 220 in the width direction of the soft-pack battery 100 to be increased. Based on this, preferably, β=0, at this time, the space occupied by the inner edge sealing portion 130 in the thickness direction of the soft-pack battery 100 is only twice its own thickness, thereby reducing the size of the first air avoidance groove 220, thereby improving the strength of the PCB board 200.

[0084] Furthermore, the second folding portions 137 of two adjacent soft-pack batteries 100 are bent in directions away from each other, so that the fifth surfaces 135 of the inner side sealing portions 130 of the adjacent soft-pack batteries 100 facing each other are affixed to each other, thereby preventing the folded second folding portions 137 from forming a protrusion on the fifth surfaces 135 of the adjacent soft-pack batteries 100 facing each other, thereby preventing the battery pack from forming a gap between the soft-pack batteries 100, thereby reducing the width of the battery pack.

[0085] Reference Figure 18 , Figure 18 for Figure 16 Schematic diagram of the structure of the inner side seal and the PCB board. Based on the above embodiment, one end of the second fold 1352 is located at the end of the second edge 1302 away from the PCB board 200. The angle between the second fold 1352 and the length direction of the soft-pack battery 100 is α, 35°≤α≤70°. Specifically, for convenience of description, the endpoint of the second fold 1352 located at the second edge 1302 is referred to as the first endpoint 1353, and the endpoint located at the third edge 1303 is referred to as the second endpoint 1354. Assuming the position of the first endpoint 1353 is fixed, the smaller the angle α, the further the second endpoint 1354 is from the fourth surface 133, that is, the larger the avoidance space formed by the inner side seal 130. However, when the second endpoint 1354 is too far away from the fourth surface 133, that is, the size of the second air avoidance groove 132 in the length direction of the soft-pack battery 100 is larger, the area that the inner edge sealing portion 130 needs to be cut is larger, and the excessively large cutting area of the inner edge sealing portion 130 will result in a reduction in the effective sealing of the inner edge sealing portion 130. Based on this, in this embodiment, α is set within a suitable range, that is, under the premise of ensuring the effective sealing effect of the inner edge sealing portion 130, the inner edge sealing portion 130 has a larger avoidance space, thereby improving the current-carrying capacity of the PCB board 200 and reducing the temperature rise of the PCB board 200.

[0086] Reference Figure 18As can be seen from the above embodiment, the second fold 1352 is arranged obliquely relative to the length direction of the soft-pack battery 100, and the thickness direction of the PCB board 200 corresponds to the length direction of the soft-pack battery 100. Therefore, after the second folding portion 137 is folded, a surface inclined toward the PCB board 200 is formed. Based on this, in some embodiments, the first air avoidance groove 220 has a first inner wall surface 221 facing the inner side sealing portion 130. Along the direction from the soft-pack battery 100 to the PCB board 200, the first inner wall surface 221 is inclined toward the second folding portion 137, that is, the first inner wall surface 221 is arranged to be an inclined surface adapted to the inclination of the second fold 1352, so that the cross-section of the PCB board 200 along its rearward direction gradually increases, thereby improving the strength of the PCB board 200. In addition, it can be understood that the area of the second surface 210 of the PCB board 200 facing away from the soft-pack battery 100 is larger than the area of the second surface 210 of the PCB board 200 facing the soft-pack battery 100. Based on this, in some embodiments, the PCB board 200 includes a circuit, and the circuit is arranged on the second surface 210 of the PCB board 200 facing away from the soft-pack battery 100, thereby increasing the area for setting the circuit, and further improving the current-carrying capacity of the PCB board 200, so as to reduce the temperature rise of the PCB board 200.

[0087] Reference Figure 19 and 17 , Figure 19 This is a structural diagram of a seventh battery pack according to the first embodiment of the utility model. Figure 20 for Figure 19 Schematic diagram of the structure of the soft-pack battery. In some embodiments, the shell 101 also includes a top sealing portion 140, which is connected to the first surface 111 and folded toward the first surface 111, thereby reducing the space occupied by the top sealing portion 140 in the length direction of the soft-pack battery to improve the energy density of the battery pack of this embodiment.

[0088] Furthermore, since the top sealing edge portion 140 and the packaging portion 110 are folded together in the embodiment, the interference between the top sealing edge portion 140 and the PCB board 200 can be reduced in the thickness direction of the soft-pack battery, thereby making the width of the PCB board 200 larger. Specifically, it can be understood that when the top sealing edge portion 140 is in an unfolded state, since the top sealing edge portion 140 protrudes from the first surface 111 of the packaging portion 110, the edge of the PCB board 200 will abut against the top sealing edge portion 140 in the thickness direction of the soft-pack battery, thereby forming a certain constraint on the width of the PCB board 200. Taking the thickness of the top sealing edge portion 140 as h1 as an example, as shown in FIG. Figure 22 As shown, Figure 22 Figure 1The side view of the soft-pack battery and the PCB board, at this time, it is necessary to satisfy Y+h1≤H, that is, Y≤H-h1. In addition, in some embodiments, the connection between the edge sealing portion of the soft-pack battery (a general term for the side edge sealing portion 120 and the top edge sealing portion 140) and the packaging portion 110 is at a certain distance from the surface of the packaging portion 110 in the thickness direction itself. Taking the distance between the top edge sealing portion 140 and a surface in the thickness direction of the packaging portion 110 as h2 as an example, at this time, it is necessary to satisfy Y+h1+h2≤H, that is, Y≤H-h1-h2. In this embodiment, the top edge sealing portion 140 is folded toward the packaging portion 110. Regardless of whether the top edge sealing portion 140 is flush with the surface in the thickness direction of the packaging portion 110 or has a certain distance therebetween, the edge of the PCB board 200 will not abut against the top edge sealing portion 140. Figure 23 As shown, Figure 23 for Figure 19 The side view of the soft-pack battery and the PCB board only needs to satisfy Y≤H, thereby increasing 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 In the enlarged schematic diagram of area E in the middle, based on the above embodiment, the top edge seal 140 is curved away from the first surface 111 on the side adjacent to the inner edge seal 130 and extends to the fifth surface 135 of the inner edge seal 130 to form an extension 141. The extension 141 has a fourth air-avoidance groove 1411, into which the first sidewall extends. Specifically, the fourth air-avoidance groove 1411 of the extension 141 is similar in principle and function to the second air-avoidance groove 132 of the inner edge seal 130 in the above embodiment, and will not be further described here.

[0090] Further, refer 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 portion 140 and the side sealing portion 120. The end of the tip portion 150 that is away from the packaging portion 110 is cut along the thickness direction of the soft-pack battery to form an air-avoidance area 151, thereby reducing the space occupied by the tip portion 150 in the length direction of the soft-pack battery, thereby improving the energy density of the soft-pack battery.

[0091] It should be noted that the avoidance area 151 formed by cutting can be cut at the corner where the side sealing portion 120 and the top sealing portion 140 intersect before the tip portion 150 is formed, that is, before the side sealing portion 120 and the top sealing portion 140 are folded. For example, a square cutting area 160 is cut at the corner where the side sealing portion 120 and the top sealing portion 140 intersect. Figure 25 As shown, Figure 25for Figure 24 The schematic diagram of the top sealing portion and the side sealing portion when they are not folded, and then the soft pack battery is folded, or the tip portion 150 is cut after the soft pack battery is folded to form the tip portion 150. In addition, for the inner sealing portion 130 and the top sealing portion 140, since they have a second avoidance groove 132 and a fourth avoidance groove 1411, they also have an avoidance area 151, such as Figure 26 As shown, Figure 26 Schematic diagram of the structure of the inner edge portion and the top edge portion forming the tip portion, therefore, the cutting area of the inner edge portion 130 and the top edge portion 140 before folding is L-shaped, such as Figure 27 As shown, Figure 27 for Figure 26 Schematic diagram of the inner center and top edge seals when unfolded.

[0092] Figures 24 to 27 The middle dashed line cannot be interpreted as the actual outline of the soft-pack battery, but is only used to clearly illustrate the air-avoidance area 151 , the second air-avoidance groove 132 , the fourth air-avoidance groove 1411 and the cutting area 160 .

[0093] In some embodiments, the size of the first avoidance groove 220 is 1.5 mm to 3 mm along the thickness direction of the soft-pack battery 100. Specifically, the first avoidance groove 220 is used to avoid the inner edge sealing portion 130. If the size of the first avoidance groove 220 is too small, the size of the inner edge sealing portion 130 will be too small, which is not conducive to the sealing of the outer 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, in the above embodiment, the width of the first board 201 is too small, resulting in the current carrying capacity of the PCB board 200 being too small. Based on this, in this embodiment, the size of the first avoidance groove 220 is set within an appropriate range, which ensures the sealing of the outer shell 101 while giving the PCB board 200 a strong current carrying capacity.

[0094] According to the second embodiment of the present invention, the electrical equipment includes: the battery pack of the first embodiment, the PCB board 200 in the battery pack is arranged toward the first surface 111 of the packaging portion 110, that is, the thickness of the PCB board 200 corresponds to the length of the soft-pack battery 100, and because the PCB board 200 is provided with a first air avoidance groove 220, the inner edge sealing portion 130 can extend into the first air avoidance groove 220, thereby avoiding interference between the PCB board 200 and the inner edge sealing portion 130. It can be seen that, compared with traditional technology, in this embodiment, the thickness of the PCB corresponds to the length of the soft-pack battery 100, avoiding the increase in the width of the battery pack caused by the width of the PCB, and the PCB board 200 has a first avoidance groove 220 for avoiding the inner edge sealing portion 130, without the need to bend the inner edge sealing portion 130 and clamp it between the PCB board 200 and the packaging portion 110. Therefore, there is no need to set a gap between the PCB board 200 and the packaging portion 110 to accommodate the inner edge sealing portion 130, thereby reducing the distance between the PCB board 200 and the packaging portion 110, and then reducing the length of the battery pack to increase the energy density of the battery pack, thereby improving the service life of the electrical equipment of this embodiment.

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

[0096] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, in the description of the present invention, the reference terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" are intended to mean 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 present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in an appropriate manner in any one or more embodiments or examples.

Claims

1. A battery pack, characterized in that include: A plurality of soft-pack batteries are distributed along the width direction of the soft-pack battery. The soft-pack battery includes a shell and a battery cell. The shell includes a packaging portion and a side sealing portion. The battery cell is located in the packaging portion. Along the width direction of the soft-pack battery, the packaging portion is provided with two opposite sides connected to the side sealing portion. The side sealing portion located between adjacent packaging portions is an inner side sealing portion. The packaging portion has a first surface at one end in the length direction of the soft-pack battery. A PCB board is located at one end in the length direction of the soft-pack battery, the inner edge sealing portion protrudes toward the PCB board relative to the first surface, the PCB board has two second surfaces opposite to each other along its own thickness direction, one of the second surfaces faces the first surface, each of the soft-pack batteries is electrically connected to the PCB board, the PCB board has a first air avoidance groove, and part of the inner edge sealing portion extends into the first air avoidance groove.

2. The battery pack according to claim 1, wherein: The inner edge sealing portion has a third surface facing the PCB board along the thickness direction of the soft-pack battery, and the inner edge sealing portion has a second air avoidance groove. The second air avoidance groove passes through the inner edge sealing portion along the width direction of the soft-pack battery and extends to the third surface. Part of the PCB board extends into the second air avoidance groove.

3. The battery pack according to claim 2, wherein: The second air-avoiding groove forms a notch on the third surface, and along the length direction of the soft-pack battery, the notch has two edges arranged opposite to each other.

4. The battery pack according to claim 2, wherein: In the length direction of the soft-pack battery, the inner edge sealing portion has a fourth surface close to the PCB board, and the second air avoidance groove extends to the fourth surface.

5. The battery pack according to claim 4, wherein: The inner edge seal includes a first folding portion, and the first folding portion is folded away from the PCB board to form the second air avoidance groove.

6. The battery pack according to claim 5, characterized in that The inner edge sealing portion has two fifth surfaces facing each other in the width direction of the soft-pack battery, the edge where the fifth surface intersects the third surface is a first edge, the edge where the fifth surface intersects the fourth surface is a second edge, and the first folding portion forms a first fold on the fifth surface; One end of the first fold is located at the first edge, and the other end is located at the second edge; or, One end of the first fold is located at the first edge, and the other end is spaced apart from the second edge; or One end of the first fold is located at the second edge, and the other end is spaced apart from the first edge.

7. The battery pack according to claim 6, characterized in that: One end of the first fold is located at the first edge, and the other end is located at the second edge. In the thickness direction of the soft-pack battery, the first air avoidance groove has a first inner wall surface facing the inner edge sealing portion. Along the direction from the soft-pack battery to the PCB board, the first inner wall surface is inclined toward the first folding portion.

8. The battery pack according to claim 4, wherein: The inner edge sealing portion has two fifth surfaces facing each other along the width direction of the soft-pack battery. In the thickness direction of the soft-pack battery, the second air-avoiding groove has a second inner wall surface facing the PCB board. The edge where the fifth surface intersects with the fourth surface is the second edge, and the edge where the fifth surface intersects with the second inner wall surface is the third edge. The inner edge sealing portion also includes a second folding portion, which is folded away from the PCB board to form a third air avoidance groove connected to the second air avoidance groove, and forms a second fold on the fifth surface, one end of the second fold is located at the second edge, and the other end is located at the third edge.

9. The battery pack according to claim 8, characterized in that One end of the second fold is located at an end of the second edge away from the PCB board, and the angle between the second fold and the length direction of the soft-pack battery is α, 35°<α≤70°.

10. The battery pack according to claim 8, wherein: In the thickness direction of the soft-pack battery, the first air avoidance groove has a first inner wall surface facing the inner edge sealing portion, and along the direction from the soft-pack battery to the PCB board, the first inner wall surface is inclined toward the second folding portion.

11. The battery pack according to claim 10, wherein: The PCB board has a circuit, the circuit is electrically connected to the soft-pack battery, and the circuit is located on the second surface of the PCB board away from the soft-pack battery.

12. The battery pack according to claim 2, wherein: The shell further includes a top sealing edge portion, which is connected to the first surface and folded toward the first surface.

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

14. The battery pack according to claim 1, wherein: Along the thickness direction of the soft-pack battery, the size of the first air-avoiding groove is 1.5 mm to 3 mm.

15. The battery pack according to claim 2, wherein: The inner edge sealing portion is cut to form the second air avoidance groove, and along the thickness direction of the soft-pack battery, the size of the second air avoidance groove is 0.3 mm to 2 mm.

16. Electrical equipment, characterized in that: A battery pack comprising the battery according to any one of claims 1 to 15.

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