Battery module and electronic device

Abstract

The utility model discloses a battery assembly and electronic equipment, and belongs to the technical field of battery packaging. The battery assembly comprises a battery cell, a packaging part and a protection plate, the battery cell comprises a battery cell body and a conductive tab; the packaging part comprises a packaging bag and a top sealing edge, and the top sealing edge wraps a part of the conductive tab and extends out of the packaging part through the top sealing edge; the protection plates are connected with the side, provided with the top sealing edge, of the packaging bag, the protection plates are distributed on one part of the top sealing edge, and the other part of the top sealing edge can be bent and electrically connected with the side, away from the packaging bag, of each protection plate. The protection plates are distributed on the top sealing edge, after the top sealing edge is bent around the protection plates, the conductive tabs are electrically connected with the sides, deviating from the packaging bag, of the protection plates, and the top sealing edge does not occupy space between the protection plates and the packaging bag in the arrangement direction of the battery body and the protection plates, so that the size in the direction can be reduced; therefore, the cell size can be increased, and the capacity of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery packaging, and in particular relates to a battery assembly and an electronic device. BACKGROUND

[0002] With the development of display technology, the demand and application range of electronic devices are continuously expanding. Common electronic devices include mobile phones, tablet computers, notebook computers and the like.

[0003] The endurance capability of electronic devices has become a key consideration for users, especially in mobile electronic devices such as mobile phones. How to improve the capacity of the battery has become a major problem in the technical improvement of electronic devices.

[0004] In commercial electronic devices, the production of the battery generally needs to meet the safety certification. The battery generally includes a battery cell and a protection plate electrically connected to the battery cell. The battery cell is electrically connected to the main body of the electronic device through the protection plate to supply power to the main body of the electronic device or be charged by the main body of the electronic device.

[0005] At present, in the limited space of the battery compartment, the volume of the battery cell is limited, and the capacity of the battery cell is difficult to improve. CONTENT OF THE INVENTION

[0006] The present application provides a battery assembly and an electronic device. The problem of how to improve the capacity of the battery can be solved, and the technical solution is as follows:

[0007] In one aspect, a battery assembly is provided, comprising: a battery cell, a packaging part and a protection plate.

[0008] The battery cell comprises: a battery cell body and a conductive tab electrically connected to the battery cell body.

[0009] The packaging part comprises: a packaging bag wrapping the battery cell body, and a top sealing edge connected to the packaging bag. The top sealing edge wraps a part of the conductive tab, and another part of the conductive tab extends out of the packaging part through the top sealing edge.

[0010] The protection plate is connected to one side of the top sealing edge of the packaging bag, and the protection plate is distributed on a part of the top sealing edge. Another part of the top sealing edge can be bent to the side of the protection plate away from the packaging bag.

[0011] The conductive tab is electrically connected to the side of the protection plate away from the packaging bag.

[0012] Optionally, the top sealing edge comprises: a first sealing edge connected to the packaging bag, and a second sealing edge connected to the first sealing edge.

[0013] The protection plate is distributed on the first sealing edge, and the second sealing edge is at least partially bent to a side of the protection plate away from the packaging bag.

[0014] The conductive tab extends out of the second sealing edge through an end of the second sealing edge away from the first sealing edge.

[0015] Optionally, the battery cell body and the protection plate are arranged along a first direction; in the first direction, the width of the first sealing edge is greater than or equal to the width of the protection plate.

[0016] Optionally, the battery cell body and the protection plate are arranged along a first direction, and the protection plate and the first sealing edge are arranged along a second direction intersecting the first direction.

[0017] The battery cell has oppositely arranged first and second side surfaces in the second direction, and in the second direction, the protection plate is distributed between the first side surface and the first sealing edge.

[0018] In the second direction, the height of the protection plate is less than or equal to the distance between the first sealing edge and the first side surface.

[0019] Optionally, the conductive tab includes a first sub-tab and a second sub-tab electrically connected to the first sub-tab.

[0020] The first sub-tab is electrically connected to the battery cell body and is at least partially wrapped by the first sealing edge.

[0021] An end of the second sub-tab connected to the first sub-tab is wrapped by the second sealing edge, and the other end of the second sub-tab extends out of the second sealing edge and is electrically connected to a side of the protection plate away from the packaging bag.

[0022] Optionally, the protection plate includes a circuit board body and a first electronic component fixed on the circuit board body.

[0023] The conductive tab is electrically connected to a side of the circuit board body away from the packaging bag, and the first electronic component is distributed on a side of the circuit board body facing the packaging bag.

[0024] Optionally, the protection plate further includes a flexible circuit board and a second electronic component.

[0025] The flexible circuit board is electrically connected to the circuit board body.

[0026] The second electronic component is fixed on the flexible circuit board, and the second electronic component is electrically connected to the circuit board body through the flexible circuit board.

[0027] Optionally, a thickness of the second electronic component in a direction perpendicular to the flexible circuit board is greater than a thickness of the first electronic component in a direction perpendicular to the circuit board body.

[0028] Optionally, the protection plate further comprises a connector fixed to a side of the flexible circuit board away from the second electronic component.

[0029] Optionally, a normal projection of the connector on the flexible circuit board overlaps with a normal projection of the second electronic component on the flexible circuit board.

[0030] Optionally, a side of the circuit board body away from the packaging bag has a first pad and a second pad, the first pad is electrically connected with the conductive tab, and the second pad is electrically connected with the flexible circuit board.

[0031] Optionally, the conductive layer of the circuit board body has less than 10 layers.

[0032] In another aspect, an electronic device comprises a device body and a battery assembly installed in the device body, the battery assembly being any of the above-mentioned battery assemblies.

[0033] The technical scheme provided by the embodiments of the present application has the following beneficial effects:

[0034] By distributing the protection plate on the top sealing edge, after the top sealing edge is bent around the protection plate, the conductive tab is electrically connected with a side of the protection plate away from the packaging bag, in the direction in which the battery body and the protection plate are arranged, the top sealing edge does not occupy space between the protection plate and the packaging bag, thereby the size in this direction can be reduced, and the size of the battery cell in this direction can be increased, thereby the capacity of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0036] Figure 1 is a common structure schematic diagram of an electronic device;

[0037] Figure 2 is a common structure schematic diagram of a battery assembly;

[0038] Figure 3 is a bottom view of the protection plate of the electronic device in Figure 1

[0039] ​Figure 4 is a side view of a protection plate of an electronic device in Figure 1 ;

[0040] Figure 5 is a structural schematic view of another existing battery assembly;

[0041] Figure 6 is a structural schematic view of an existing battery assembly;

[0042] Figure 7 is a top view of Figure 6 ;

[0043] Figure 8 is a structural schematic view of a battery assembly provided by an embodiment of the present application;

[0044] Figure 9 is a structural schematic view of a cell of a battery assembly provided by an embodiment of the present application before a top sealing edge is bent;

[0045] Figure 10 is a structural schematic view of a cell of a battery assembly provided by an embodiment of the present application after a top sealing edge is bent;

[0046] Figure 11 is a top view of Figure 8 ;

[0047] Figure 12 is a structural schematic view of a top sealing edge and a conductive tab of a battery assembly provided by an embodiment of the present application;

[0048] Figure 13 is a structural schematic view of a multi-tab cell provided by an embodiment of the present application;

[0049] Figure 14 is a sectional view along the direction A-A of Figure 13 ;

[0050] Figure 15 is a packaging process schematic view of a battery assembly shown in Figure 6 ;

[0051] Figure 16 is an effect schematic view of tab reverse insertion of a packaging process of Figure 15 adopting an existing multi-tab cell;

[0052] Figure 17 is a process schematic view of a packaging method of a battery assembly provided by an embodiment of the present application;

[0053] Figure 18 is a structural schematic view of a protection plate of a high-power battery assembly in the prior art;

[0054] Figure 19 isFigure 1 A bottom view;

[0055] Figure 20 for Figure 18 The left view;

[0056] Figure 21 A schematic diagram of the structure of a protection board for a battery assembly provided in an embodiment of this application;

[0057] Figure 22 for Figure 21 A bottom view;

[0058] Figure 23 for Figure 21 The left view;

[0059] Figure 24 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0061] For existing electronic devices such as mobile phones, tablets, media players (MP3, MP4), and laptops, battery life is a key consideration for users when purchasing. This application uses a mobile phone as an example. When using a mobile phone, users have requirements regarding battery life and size. For instance, users want the phone to be neither too thick nor too large. Therefore, the space available for the battery compartment is relatively limited, and the battery capacity is constrained. Increasing battery capacity has become a major technical challenge in the development of electronic devices.

[0062] Please refer to Figures 1 to 4 , Figure 1 This is a schematic diagram of the structure of a common electronic device; Figure 2 This is a schematic diagram of a common battery assembly structure; Figure 3 for Figure 1 A bottom view of the protection board of the electronic device in the image; Figure 4 for Figure 1 The image shows a side view of a protection board for an electronic device. The electronic device may include a battery assembly 00, a frame (not shown), and a motherboard 30. The frame has a battery compartment 40, in which the battery assembly 00 is placed. The battery assembly 00 may include a battery cell 10 and a protection board 20 electrically connected to the battery cell 10.

[0063] like Figures 1 to 2As shown, the existing protection plate 20 is placed horizontally relative to the battery cell 10, one side of the protection plate 20 is provided with electronic components 22 such as chips, capacitors, resistors, transistors and the like, this side can be defined as the front side of the protection plate 20, and the side opposite to the front side is defined as the back side; the back side is provided with a welding component 23 electrically connected with the conductive tab 13 of the battery cell 10, and the protection plate 20 is connected with the mainboard 30 of the electronic device through a flexible circuit board 24 and a connector 25, so that the battery cell 10 supplies power to the mainboard 30 through the protection plate 20. Generally, the welding component 23 is arranged at a position away from the electronic components 22 of the battery cell, generally at the edge of the front side of the protection plate 20 or on the back side.

[0064] For ease of description, in the embodiments of the present application, the battery cell 10 is taken as a reference, and the direction in which the battery cell 10 and the protection plate 20 are arranged is defined as a first direction X, and the battery cell 10 and the protection plate 20 are generally flat plates, and the thickness direction thereof can be defined as a second direction Y, wherein the first direction X and the second direction Y can be perpendicular, and a direction perpendicular to both the first direction X and the second direction Y is defined as a third direction Z.

[0065] As shown in Figure 1 and Figure 2 , the conductive tab 13 is drawn from the first direction X, and it can be seen that the protection plate 20 occupies a certain space in the first direction X, which limits the volume of the battery cell 10 and makes it difficult to improve the capacity of the battery. Please refer to Figure 5 , Figure 5 , which is a structural schematic diagram of another existing battery assembly, in order to increase the capacity of the battery, an existing battery assembly 00 proposes a scheme of placing the protection plate 20 horizontally relative to the battery cell 10.

[0066] It should be noted that the horizontal placement means that the battery and the protection plate 20 are distributed substantially in parallel as shown in Figure 2 , and the horizontal placement means that the battery and the protection plate 20 are distributed substantially in parallel as shown in Figure 4 .

[0067] It can be seen that the scheme of placing the protection plate 20 horizontally can reduce the space occupied by the protection plate 20 in the first direction X, so that the size of the battery cell 10 in the first direction X can be larger, thereby improving the capacity of the battery.

[0068] Please refer to Figure 6 and Figure 7 , Figure 6 , which is a structural schematic diagram of an existing battery assembly; Figure 7 is a top view of Figure 6 . The battery assembly 00 can include a battery cell 10, an encapsulation part 12 and a protection plate 20. The battery cell 10 can include a battery cell body 11 and a conductive tab 13 electrically connected with the battery cell body 11.

[0069] The packaging part 12 can include a packaging bag 12b wrapping the battery cell body 11, and a top sealing edge 12a connected with the packaging bag 12b, the top sealing edge 12a wrapping a part of the conductive tab 13, and another part of the conductive tab 13 extending out of the packaging part 12 through the top sealing edge 12a. An end of the top sealing edge 12a away from the packaging bag 12b is folded to be connected with the packaging bag 12b, and the conductive tab 13 is folded to be electrically connected with a side of the protection plate 20 facing the packaging bag 12b. The conductive tab 13 and the top sealing edge 12a are located between the protection plate 20 and the packaging bag 12b.

[0070] As shown in Figure 6 With Figure 7 In the first direction X, the overall length of the battery assembly 00 includes the length of the battery cell 10, the thickness of the top sealing edge 12a, the thickness of the conductive tab 13, the thickness of the welding part 23 (if any), the thickness of the flexible circuit board 24 (if any), and the thickness of the circuit board body 21. It can be seen that the size of the protection plate 20 and the part of the protection plate 20 connected with the battery cell body 11 in the first direction X is still relatively large, and the battery capacity needs to be improved.

[0071] Please refer to Figures 8 to 11 , Figure 8 A structural schematic diagram of a battery assembly provided by an embodiment of the present application; Figure 9 A structural schematic diagram of a battery cell of a battery assembly provided by an embodiment of the present application before the top sealing edge is folded; Figure 10 A structural schematic diagram of a battery cell of a battery assembly provided by an embodiment of the present application after the top sealing edge is folded; Figure 11 A Figure 8 top view. The present application provides a battery assembly 000, which can include a battery cell 100, a packaging part 120, and a protection plate 200.

[0072] The battery cell 100 can include a battery cell body 110, and a conductive tab 130 electrically connected with the battery cell body 110. For example, the battery cell 100 can be a lithium battery cell.

[0073] The packaging part 120 can include a packaging bag 122 wrapping the battery cell body 110, and a top sealing edge 121 connected with the packaging bag 122, the top sealing edge 121 wrapping a part of the conductive tab 130, and another part of the conductive tab 130 extending out of the packaging part 120 through the top sealing edge 121. The packaging part 120 can be a soft packaging bag made of aluminum plastic film, which can be used to package the battery cell 100, and the present application does not limit the specific material and the specific packaging process of the packaging part 120.

[0074] The protection plate 200 is connected with one side of the top sealing edge 121 of the packaging bag 122, and the protection plate 200 is distributed on a part of the top sealing edge 121, and another part of the top sealing edge 121 can be bent to the side of the protection plate 200 away from the packaging bag 122.

[0075] The conductive tab 130 is electrically connected with the side of the protection plate 200 away from the packaging bag 122.

[0076] As shown in Figure 8 As shown in Figure 11 In the first direction X, the thickness of the battery assembly 000 includes the length of the battery cell 100, the thickness of the flexible circuit board 240 (if any), the thickness of the circuit board body 210, the thickness of the welding part 230 (if any), and the thickness of the conductive tab 130. It can be seen that the battery assembly 000 provided by the embodiment of the present application can save the thickness of the top sealing edge 121 in the first direction X, so that the size of the battery cell body 110 in the first direction X can be larger, and the capacity of the battery can be improved.

[0077] In summary, by distributing the protection plate on the top sealing edge, the conductive tab is electrically connected with the side of the protection plate away from the packaging bag after the top sealing edge is bent around the protection plate. In the direction in which the battery cell body and the protection plate are arranged, the top sealing edge does not occupy space between the protection plate and the packaging bag, thereby reducing the size in this direction, so that the size of the battery cell in this direction can be increased, and the capacity of the battery can be improved.

[0078] Please refer to Figure 12 , Figure 12 is a structural schematic diagram of the top sealing edge and the conductive tab of the battery assembly provided by the embodiment of the present application. In the embodiment of the present application, the top sealing edge 121 can include a first sealing edge 121a connected with the packaging bag 122, and a second sealing edge 121b connected with the first sealing edge 121a.

[0079] The protection plate 200 is distributed on the first sealing edge 121a, and the second sealing edge 121b is at least partially bent to the side of the protection plate 200 away from the packaging bag 122; the conductive tab 130 extends out of the second sealing edge 121b through the end of the second sealing edge 121b away from the first sealing edge 121a.

[0080] For example, in Figure 12 , the top sealing edge 121 is bent to the back of the protection plate 200 around the bottom of the protection plate 200, and the conductive tab 130 is electrically connected with the back of the protection plate 200, such as being welded on the back of the protection plate 200. After being bent, the top sealing edge 121 can form the first sealing edge 121a and the second sealing edge 121b, and the protection plate 200 is distributed above the first sealing edge 121a, and the second sealing edge 121b is located on the side of the protection plate 200 away from the packaging bag 122, such as Figure 12The first sealing edge 121a can insulate the conductive tab 130 and the side of the protection plate 200 facing the first sealing edge 121a, and the second sealing edge 121b can insulate the conductive tab 130 and the side of the protection plate 200 facing the first sealing edge 121a and the edge region away from the packaging bag 122.

[0081] In some possible implementations, the battery cell body 110 and the protection plate 200 are arranged along a first direction X; in the first direction X, the width of the first sealing edge 121a is greater than or equal to the width of the protection plate 200.

[0082] That is, the distance between the bending point of the top sealing edge 121 and the side of the packaging bag 122 facing the protection plate 200 is greater than or equal to the width of the protection plate 200, so that the second sealing edge 121b can be bent to the back of the protection plate 200, and the top sealing edge 121 can completely wrap the side of the protection plate 200 facing the first sealing edge 121a. The farther the bending point is, the less the deformation of the end of the conductive tab 130 connected to the battery cell body 110 inside the top sealing edge 121 when the top sealing edge 121 is bent, and the problem of tab insertion is alleviated.

[0083] In the embodiments of the present application, as shown in Figure 10 The protection plate 200 and the first sealing edge 121a are arranged along a second direction Y, the second direction Y intersects the first direction X, for example, is perpendicular; the battery cell 100 has a first side surface 102a and a second side surface 102b arranged opposite to each other in the second direction Y, in the second direction Y, the protection plate 200 is distributed between the first side surface 102a and the first sealing edge 121a; in the second direction Y, the height of the protection plate 200 is less than or equal to the distance between the first sealing edge 121a and the first side surface 102a. In addition, a third direction Z is perpendicular to the first direction X and the second direction Y.

[0084] As shown in Figure 8 and Figure 12 In use of the electronic device, the battery assembly 000 also has a limit in the thickness direction of the electronic device, and generally requires the battery assembly 000 to be flat, therefore, the protection plate 200 cannot protrude out of the battery cell 100 in the second direction Y, that is, cannot be higher than the first side surface 102a, and cannot be lower than the second side surface 102b. Therefore, in the case that the protection plate 200 is distributed between the first side surface and the first sealing edge 121a, the height of the protection plate is less than or equal to the distance between the first sealing edge 121a and the first side surface 102a. Thus, after the battery cell 100 and the protection plate 200 are re-packaged to form the battery assembly 000, the two opposite planes of the battery assembly 000 in the second direction Y are flat.

[0085] In some possible implementations, as shown in Figure 12As shown, the conductive tab 130 can include a first sub-tab 131 and a second sub-tab 132 electrically connected to the first sub-tab 131; the first sub-tab 131 is electrically connected to the battery body 110 and at least partially wrapped by the first sealing edge 121a; the end of the second sub-tab 132 connected to the first sub-tab 131 is wrapped by the second sealing edge 121b; the other end of the second sub-tab 132 extends from the second sealing edge 121b and is electrically connected to the side of the protection plate 200 away from the packaging bag 122.

[0086] As shown in FIG. 1, Figure 10 As shown in FIG. 1, Figure 12 As shown, after the top sealing edge 121 is bent, the top sealing edge 121 can form a first sealing edge 121a and a second sealing edge 121b, and the conductive tab 130 can also correspondingly form a first sub-tab 131 and a second sub-tab 132; the first sub-tab 131 extends into the packaging bag 122 through the first sealing edge 121a to be electrically connected to the battery body 110, and the second sub-tab 132 extends from the second sealing edge 121b to be electrically connected to the protection plate 200. It can be seen that the bending point of the conductive tab 130 is at the part where the first sub-tab 131 and the second sub-tab 132 are connected, and the end of the first sub-tab 131 connected to the battery body 110 is reduced due to the influence of bending.

[0087] As shown in FIG. 1, Figure 13 As shown in FIG. 1, Figure 14 As shown in FIG. 1, Figure 13 A structure schematic diagram of a multi-tab battery provided by an embodiment of the present application; Figure 14 As shown in FIG. 1, Figure 13 As shown in FIG. 1, the battery 100 can be a multi-tab battery, and the battery body 110 can further include a plurality of connection tabs 112 and a plurality of pole pieces 111; the plurality of connection tabs 112 correspond to the plurality of pole pieces 111 one by one, and each pole piece 111 is electrically connected to the conductive tab 130 through a connection tab 112.

[0088] As shown in FIG. 1, Figure 14 As shown, the conductive tab 130 can be two, including a positive conductive tab and a negative conductive tab; the connection tab 112 includes a positive connection tab 112a and a negative connection tab 112b; the pole piece 111 includes a positive pole piece 111a and a negative pole piece 111b; the positive pole piece 111a is electrically connected to the positive conductive tab through the positive connection tab 112a, and the negative pole piece 111b is electrically connected to the negative conductive tab through the negative connection tab 112b.

[0089] As shown in FIG. 1, Figure 15 As shown in FIG. 1, Figure 15 As shown in FIG. 1, Figure 6 As shown in FIG. 1, Figure 15As shown, firstly, the top sealing edge 12a needs to be bent along the part that needs to be connected to the packaging bag 12b. The end of the top sealing edge 12a is bonded to the packaging bag 12b with adhesive 51. At this time, the conductive electrode ear 13 inside the top sealing edge 12a is bent for the first time, and the end of the conductive electrode ear 13 connected to the cell body 11 is deformed more. Then, the conductive electrode ear 13 is bent for the second time and then electrically connected to the protection plate 20, for example, by welding to the welding part 23 of the protection plate 20. Finally, the conductive electrode ear 13 is bent for the third time so that the side of the protection plate 20 that is electrically connected to the conductive electrode ear 13 is as close as possible to the packaging bag 12b.

[0090] Currently, the technical solution of placing the protection board 20 horizontally involves bending the top sealing edge 12a of the battery cell 10 and the conductive electrode tab 13. The conductive electrode tab 13 requires three bends, and it experiences significant stress during the process, causing it to be inserted upside down into the interlayer connecting the electrode tab 15. Please refer to... Figure 16 , Figure 16 To adopt existing multi-pole battery cells Figure 15 The diagram illustrates the effect of reverse insertion of the tabs in the packaging process. When cell 10 is a multi-tab cell, reverse insertion of the conductive tab 13 will cause deformation of the current collector inside cell 10 (i.e., the connecting tab 15, also called the small tab or soft tab; correspondingly, the conductive tab 13 can also be called the large tab or hard tab). Deformation of the current collector can easily cause an internal short circuit in cell 10, leading to fire and explosion. Therefore, multi-tab cells cannot currently achieve the above-mentioned horizontal placement process design.

[0091] Please refer to Figure 17 , Figure 17 This is a schematic diagram of a battery assembly encapsulation method provided in an embodiment of this application.

[0092] like Figure 17 As shown, the encapsulation method may include:

[0093] Step S1: Provide a battery cell 100 with a package 120 and a protection board 200, and electrically connect the conductive electrode tab 130 to the protection board 200, for example, by welding it to the welding component 230 of the protection board 200.

[0094] The battery cell 100 may include: a battery cell body 110, and conductive electrode tabs 130 electrically connected to the battery cell body 110.

[0095] The encapsulation portion 120 may include: an encapsulation bag 122 that encapsulates the battery cell body 110, and a top sealing edge 121 connected to the encapsulation bag 122. The top sealing edge 121 encapsulates a portion of the conductive electrode ears 130, and another portion of the conductive electrode ears 130 extends out of the encapsulation portion 120 through the top sealing edge 121.

[0096] For example, the welding component 230 can be a nickel sheet in L shape, one end of the welding component 230 is welded with the circuit board body 210, and the other end is welded with the conductive tab 130. At this time, the welding component 230 can be folded to obtain the protection plate 200 lying relative to the battery cell 100.

[0097] For another example, the protection plate 200 can also be directly laid flat and then welded with the conductive tab 130. The back of the protection plate 200 can be provided with a solder pad, and the conductive tab 130 can be directly welded to the solder pad.

[0098] In step S2, one end of the top sealing edge 121 away from the packaging bag 122 is folded, and the part of the conductive tab 130 wrapped by the top sealing edge 121 is folded, so that the protection plate 200 is turned over to the battery cell 100. The protection plate 200 is connected to the side of the packaging bag 122 provided with the top sealing edge 121, and the protection plate 200 is distributed on part of the top sealing edge 121, and the other part of the top sealing edge 121 can be folded to the side of the protection plate 200 away from the packaging bag 122. The conductive tab 130 is electrically connected to the side of the protection plate 200 away from the packaging bag 122.

[0099] For example, in the case of the protection plate 200 having a flexible circuit board 240, the flexible circuit board 240 can be folded first, and then the top sealing edge 121 is folded.

[0100] For another example, the side of the packaging bag 122 facing the protection plate 200 can be provided with an adhesive 301 (such as double-sided tape) to bond the protection plate 200 to the packaging bag 122.

[0101] Using the above packaging method, the battery assembly 000 provided by the embodiments of the present application can be obtained as shown in Figure 8 and Figure 11 Compared with the existing battery assembly 00 as shown in Figure 6 , the size occupied by the connection structure between the protection plate 200 and the battery cell 100 in the first direction X can be further reduced. Moreover, in the battery assembly 000 of the embodiments of the present application, the top sealing edge 121 and the conductive tab 130 can be folded only once, and the folding point is further away from the folding point of the existing packaging process as shown in Figure 5 , and the number of folding is less, which reduces the deformation degree of the end of the conductive tab 130 connected to the battery cell body 110, and improves the problem of tab reverse insertion as shown in Figure 16 , and improves the safety of the battery.

[0102] In summary, the packaging method provided by the embodiments of the present application can reduce the folding degree of the top sealing edge, and the folding point is further away from the folding point of the existing packaging process as shown in Figure 15The bending point in the conductive lug is farther away from the packaging bag, and the conductive lug is bent once, which can reduce the bending angle of the conductive lug inside the packaging bag, and can effectively improve the problem of reverse insertion of the conductive lug.

[0103] As shown in Figure 1 With Figure 7 As shown, the length of the protection plate 20 in the third direction Z (corresponding to the left and right directions in the figure) cannot generally exceed the length of the battery body 11 in the left and right directions, and the thickness cannot exceed the thickness of the battery 10 in the thickness direction. Please refer to Figures 18 to 20 , Figure 18 is a structural schematic diagram of a protection plate of a prior art high-power battery assembly; Figure 19 is a bottom view of Figure 18 ; Figure 20 is a left view of Figure 18 . The prior art high-power battery assembly, for example, a 120W battery assembly, in order to avoid overheating of electronic components in the protection plate, such as transistors (such as MOS tubes) in the control charging and discharging circuit, more electronic components are needed to realize step-up or step-down control, for example, two battery protection chips and four MOS tubes are needed for a conventional secondary charging and discharging protection circuit, and more MOS tubes are needed for the protection plate of the high-power battery assembly, such as 8 MOS tubes. At this time, due to the limited area of the front of the protection plate, it is difficult to arrange more electronic components.

[0104] As shown in Figure 18 The prior art protection plate 20 sets part of the electronic components 22 on the back of the protection plate 20, as shown in Figure 20 This results in a thicker thickness in the up and down direction in Figure 20 Corresponding to the case of using a protection plate horizontal placement process (such as Figure 15 and Figure 17 The packaging process), the size of the protection plate in the first direction X is larger, and the size of the battery assembly in the first direction X is larger, which compresses the volume of the battery.

[0105] Please refer to Figures 21 to 23 , Figure 21 is a structural schematic diagram of a protection plate of a battery assembly provided in the embodiment of the application; Figure 22 is a bottom view of Figure 21 ; Figure 23 is a left view of Figure 21 . In the embodiment of the application, the protection plate 200 can include: a circuit board body 210, and a first electronic component 220 fixed on the circuit board body 210; the conductive lug 130 is electrically connected to the side of the circuit board body 210 away from the packaging bag 122; the first electronic component 220 is distributed on the side of the circuit board body 210 facing the packaging bag 122.

[0106] In some possible implementation manners, the protection plate 200 can further include a flexible circuit board 240 and a second electronic component 250; the flexible circuit board 240 is electrically connected with the circuit board body 210; the second electronic component 250 is fixed on the flexible circuit board 240, and the second electronic component 250 is electrically connected with the circuit board body 210 through the flexible circuit board 240.

[0107] As shown in FIG. 1, in the up-down direction in the circuit board body 210, the thickness of the protection plate 200 on one side of the circuit board body 210 includes the thickness of the first electronic component 220, the thickness of the circuit board body 210, and the thickness of one of the flexible circuit board 240 and the welding component 230. Figures 21 to 23 Figure 23 As shown in FIG. 1, in the up-down direction in the circuit board body 210, the thickness of the protection plate 200 on one side of the circuit board body 210 includes the thickness of the first electronic component 220, the thickness of the circuit board body 210, and the thickness of one of the flexible circuit board 240 and the welding component 230.

[0108] As shown in FIG. 1, in the up-down direction in the circuit board body 210, the thickness of the protection plate 200 on one side of the circuit board body 210 includes the thickness of the first electronic component 220, the thickness of the circuit board body 210, and the thickness of one of the flexible circuit board 240 and the welding component 230. Figure 20 As can be seen, the protection plate 200 provided by the embodiment of the present application is thinner than the protection plate 20 shown in FIG. 1, and has a smaller size in the first direction X of the battery assembly 000, which can improve the volume of the battery cell 100 and thus improve the battery capacity.

[0109] Figure 20 In the embodiment of the present application, the number of conductive layers of the circuit board body 210 is less than 10.

[0110] When more electronic components are needed, the number of conductive layers of the circuit board body needs to be increased, which leads to an increase in the thickness of the circuit board body and further leads to an increase in the thickness of the protection plate as a whole. As shown in FIG. 1, the number of printed layers of the circuit board body 21 of the conventional protection plate 20 is generally 6, while as shown in FIG. 2, the protection plate 20 of the high-power battery assembly generally needs 10 conductive layers.

[0111] In the embodiment of the present application, by arranging part of the electronic components on the flexible circuit board 240, the number of conductive layers of the circuit board body 210 can be reduced, and the electrical connection of the electronic components in the protection plate 200 can be completed by 3 or 4 conductive layers, so that the thickness of the circuit board body 210 can be reduced, and finally the thickness of the protection plate 200 can be reduced. Figures 2 to 4 Figures 18 to 20 As shown in FIG. 1, in the up-down direction in the circuit board body 210, the thickness of the protection plate 200 on one side of the circuit board body 210 includes the thickness of the first electronic component 220, the thickness of the circuit board body 210, and the thickness of one of the flexible circuit board 240 and the welding component 230.

[0112] As shown in FIG. 1, in the up-down direction in the circuit board body 210, the thickness of the protection plate 200 on one side of the circuit board body 210 includes the thickness of the first electronic component 220, the thickness of the circuit board body 210, and the thickness of one of the flexible circuit board 240 and the welding component 230.

[0113] As shown in FIG. 1, in the up-down direction in the circuit board body 210, the thickness of the protection plate 200 on one side of the circuit board body 210 includes the thickness of the first electronic component 220, the thickness of the circuit board body 210, and the thickness of one of the flexible circuit board 240 and the welding component 230. Figure 23 As shown in FIG. 1, in the up-down direction in the circuit board body 210, the thickness of the protection plate 200 on one side of the circuit board body 210 includes the thickness of the first electronic component 220, the thickness of the circuit board body 210, and the thickness of one of the flexible circuit board 240 and the welding component 230.​​​

[0114] For example, the first electronic component 220 may include small devices such as transistor 221, resistor 222, capacitor, or inductor, while the second electronic component 250 may include larger devices such as battery protection chip and power metering chip. The transistor 221 can be used in a battery protection circuit, and the resistor 222 may be a precision resistor, which can be used in a power metering circuit.

[0115] For example, such as Figure 21 As shown, in the direction parallel to the circuit board body 210, the planar dimension of the second electronic component 250 is larger than the planar dimension of the first electronic component 220. Distributing the second electronic component 250 on the flexible circuit board 240 allows the circuit board body 210 to... Figure 21 The dimensions shown in the vertical and horizontal directions are smaller. Ultimately, this allows the protection plate 200 to... Figure 8 The smaller width in the first direction X and the smaller height in the second direction Y, as shown, can also make... Figure 11 The length on the third direction Z shown is smaller.

[0116] By placing the second electronic component 250 on the flexible circuit board 240 instead of on the circuit board body 210, the overall thickness of the protective board 200 can be reduced. Furthermore, since the larger second electronic component 250 is not placed on the circuit board body 210, the front side of the circuit board body 210 has more area for the first electronic component 220, eliminating the need for an electronic component on the back side. Without the larger second electronic component 250 on the circuit board body 210, the length (corresponding to the length in the third direction Z) and width (corresponding to the height in the second direction Y) of the circuit board body 210 can be reduced. Moreover, as the number of electronic components on the circuit board body 210 decreases, the number of conductive layers on the circuit board body 210 can be reduced, and the thickness of the circuit board body 210 itself (corresponding to the width in the first direction X) can also be reduced. Ultimately, the overall size of the protection plate 200 can be reduced. After the protection plate 200 is distributed on the top sealing edge 121, the protection plate 200 will not protrude above the first side 102a or the second side 102b of the cell 100, ensuring that the thickness of the encapsulated battery assembly 000 does not exceed the design thickness.

[0117] Among the possible ways to achieve this, such as Figures 21 to 23As shown, the protection board 200 may further include a connector 260, which can be used to connect to the motherboard of an electronic device. The connector 260 is fixed to the side of the flexible circuit board 240 opposite to the second electronic component 250; wherein the orthographic projection of the connector 260 on the flexible circuit board 240 overlaps with the orthographic projection of the second electronic component 250 on the flexible circuit board 240.

[0118] like Figure 23 As shown, one end of the flexible circuit board 240 away from the circuit board body 210 can be electrically connected to the connector 260, and the other side of the flexible circuit board 240 away from the connector 260 can be electrically connected to the first electronic component 220. Thus, the connector 260 can provide a certain support for the flexible circuit board 240, so that the second electronic component 250 can be firmly connected to the flexible circuit board 240.

[0119] In some possible implementations, the circuit board body 210 has a first pad (not shown) and a second pad (not shown) on the side opposite to the package bag 122. The first pad is electrically connected to the conductive electrode tab 130, and the second pad is electrically connected to the flexible circuit board 240.

[0120] For example, the welding component 230 is fixed to the circuit board body 210 by welding to the first pad, and the conductive electrode tab 130 is welded to the welding component 230.

[0121] In this embodiment, the flexible circuit board 240 is connected to the side of the circuit board body 210 that is electrically connected to the conductive electrode tab 130, which is the back side of the circuit board body 210. The flexible circuit board 240 is superior to existing protective boards (such as...) Figure 3 and Figure 19 As shown in the protective plate 20), the flexible circuit board 240 does not completely cover the back of the protective plate 200. The conductive electrode ear 130 is electrically connected to the uncovered area on the back of the protective plate 200. For example, the welding component 230 is electrically connected to the uncovered area on the back of the protective plate 200.

[0122] like Figure 4 and Figure 20 As shown, on one side of the circuit board body 21, the thickness of the existing protective board 20 includes the thickness of the electronic components 22, the thickness of the circuit board body 21, the thickness of the flexible circuit board 24, and the thickness of the soldering components 23. Figure 23 As shown, on one side of the circuit board body 21, the thickness of the protection board 200 in this embodiment includes the thickness of the first electronic component 220, the thickness of the circuit board body 210, and the thickness of the flexible circuit board 240 or the thickness of the welding component 230, which can achieve a thinner effect in the vertical direction shown in the figure.

[0123] Please refer toFigure 24 , Figure 24 A structural schematic diagram of an electronic device is provided in the embodiments of the present application. The electronic device 400 provided in the embodiments of the present application can include a device body 300 and a battery assembly installed in the device body 300, and the battery assembly is the battery assembly 000 described in the above embodiments, which can be used to supply power to the device body.

[0124] The embodiments of the present application are not limited to the specific type of the electronic device 400. The device body can include a frame, a mainboard, a display module and other common structures.

[0125] It can be seen that the electronic device 400 has the battery assembly 000 provided in the present application, which can increase the battery capacity and improve the endurance of the electronic device. In addition, the battery assembly 000 has other technical effects, which are not repeated here.

[0126] In summary, the battery assembly and the electronic device provided in the embodiments of the present application can distribute the protection plate on the top sealing edge, and after the top sealing edge is bent around the protection plate, the conductive tab is electrically connected with the side of the protection plate away from the packaging bag. In the direction of the arrangement of the battery body and the protection plate, the top sealing edge does not occupy space between the protection plate and the packaging bag, so that the size in this direction can be reduced, so that the size of the battery cell in this direction can be increased, thereby improving the capacity of the battery, and improving the endurance of the electronic device.

[0127] In the present application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. The term "a plurality of" refers to two or more, unless otherwise explicitly limited.

[0128] The above description is only optional embodiments of the present application, and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery assembly, characterized in that, include: Battery cell (100), encapsulation section (120) and protection board (200); The battery cell (100) includes: a battery cell body (110) and conductive electrode tabs (130) electrically connected to the battery cell body (110). The encapsulation part (120) includes: an encapsulation bag (122) that wraps the battery cell body (110), and a top sealing edge (121) connected to the encapsulation bag (122). The top sealing edge (121) wraps a portion of the conductive electrode ears (130), and another portion of the conductive electrode ears (130) extends out of the encapsulation part (120) through the top sealing edge (121). The protective plate (200) is connected to the packaging bag (122) on the side where the top sealing edge (121) is located, and the protective plate (200) is distributed on a portion of the top sealing edge (121), while the other portion of the top sealing edge (121) can be bent to the side of the protective plate (200) away from the packaging bag (122); The conductive electrode ear (130) is electrically connected to the side of the protective plate (200) opposite to the packaging bag (122).

2. The battery assembly according to claim 1, characterized in that, The top sealing edge (121) includes: a first sealing edge (121a) connected to the packaging bag (122), and a second sealing edge (121b) connected to the first sealing edge (121a). The protective plate (200) is distributed on the first sealing edge (121a), and the second sealing edge (121b) is at least partially bent to the side of the protective plate (200) away from the packaging bag (122); The conductive electrode ear (130) extends out of the second sealing edge (121b) through the end opposite to the first sealing edge (121a).

3. The battery assembly according to claim 2, characterized in that, The battery cell body (110) and the protection plate (200) are arranged along a first direction; in the first direction, the width of the first sealing edge (121a) is greater than or equal to the width of the protection plate (200).

4. The battery assembly according to claim 2, characterized in that, The battery cell body (110) and the protection plate (200) are arranged along a first direction, and the protection plate (200) and the first sealing edge (121a) are arranged along a second direction, the second direction intersecting the first direction; The battery cell (100) has a first side (102a) and a second side (102b) disposed opposite to each other in the second direction. In the second direction, the protective plate (200) is distributed between the first side (102a) and the first sealing edge (121a). In the second direction, the height of the protective plate (200) is less than or equal to the distance between the first edge seal (121a) and the first side surface (102a).

5. The battery assembly according to claim 2, characterized in that, The conductive electrode ear (130) includes: a first sub-electrode ear (131) and a second sub-electrode ear (132) electrically connected to the first sub-electrode ear (131); The first sub-tab (131) is electrically connected to the cell body (110) and is at least partially wrapped by the first sealing edge (121a); One end of the second sub-taper (132) connected to the first sub-taper (131) is wrapped by the second sealing edge (121b); the other end of the second sub-taper (132) extends from the second sealing edge (121b) and is electrically connected to the side of the protective plate (200) opposite to the packaging bag (122).

6. The battery assembly according to claim 1, characterized in that, The protection board (200) includes: a circuit board body (210), and a first electronic component (220) fixed on the circuit board body (210). The conductive electrode ear (130) is electrically connected to the side of the circuit board body (210) away from the packaging bag (122); the first electronic component (220) is distributed on the side of the circuit board body (210) facing the packaging bag (122).

7. The battery assembly according to claim 6, characterized in that, The protection board (200) also includes: a flexible circuit board (240) and a second electronic component (250); The flexible circuit board (240) is electrically connected to the circuit board body (210); The second electronic component (250) is fixed on the flexible circuit board (240), and the second electronic component (250) is electrically connected to the circuit board body (210) through the flexible circuit board (240).

8. The battery assembly according to claim 7, characterized in that, The thickness of the second electronic component (250) in the direction perpendicular to the flexible circuit board (240) is greater than the thickness of the first electronic component (220) in the direction perpendicular to the circuit board body (210).

9. The battery assembly according to claim 7, characterized in that, The protection board (200) further includes a connector (260) fixed to the side of the flexible circuit board (240) away from the second electronic component (250); The orthographic projection of the connector (260) on the flexible circuit board (240) overlaps with the orthographic projection of the second electronic component (250) on the flexible circuit board (240).

10. The battery assembly according to claim 7, characterized in that, The circuit board body (210) has a first pad and a second pad on the side opposite to the packaging bag (122). The first pad is electrically connected to the conductive electrode ear (130), and the second pad is electrically connected to the flexible circuit board (240).

11. The battery assembly according to any one of claims 7 to 10, characterized in that, The conductive layer of the circuit board body (210) has less than 10 layers.

12. An electronic device, characterized in that, include: The device body and the battery assembly installed in the device body, wherein the battery assembly is the battery assembly according to any one of claims 1-11 (000).

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