Battery protection board, battery assembly and electric equipment

Abstract

The utility model relates to the field of battery protection plates, in particular to a battery protection plate, a battery and an electric device, which comprise a first connecting layer and a second connecting layer, the first connecting layer comprises a first connecting part, and the second connecting layer comprises a protection sheet; the protection sheet covers the orthographic projection of the first connection part on the second connection layer; the protection sheet and the first connection part have the same polarity or the protection sheet has no polarity. Therefore, a tab of a battery cell can be directly welded on the battery protection plate, when the first connecting part is welded through, the tab is welded to the protection sheet of the second connecting layer, and the protection sheet of the second connecting layer and the first connecting part have the same polarity or the protection sheet has no polarity, so that short circuit of the battery protection plate cannot be caused; and a battery protection plate nickel sheet is omitted, so that the production cost is reduced.

Description

Technical Field

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

[0002] Because laser spot welding can easily penetrate the battery protection board, the battery cell tabs cannot be directly welded to the battery protection board. Currently, the industry's common solution is to use nickel sheets to connect the battery cell and the battery protection board separately to achieve electrical connection. However, the use of nickel sheets increases the cost of the battery pack. Utility Model Content

[0003] An embodiment of the present application provides a battery protection plate. By adjusting the arrangement of the connection layers of the battery protection plate, when the first connection part is welded through, it will be welded to the protection sheet of the second connection layer. Since the protection sheet of the second connection layer and the first connection part have the same polarity or the protection sheet has no polarity, the welding process will not cause a short circuit of the battery protection plate. In this way, the battery cell tab can be directly welded to the battery protection board pad, the nickel sheet of the battery protection board is eliminated, and the production cost is reduced.

[0004] According to the utility model, a battery protection plate includes a first connection layer and a second connection layer, wherein the first connection layer includes a first connection portion; the second connection layer includes a protection sheet;

[0005] Along a first direction, the first connection layer and the second connection layer are stacked, and the first connection layer and the second connection layer are electrically connected;

[0006] The protection sheet is provided corresponding to the first connection portion, and the polarity of the protection sheet is the same as that of the first connection portion, or the protection sheet has no polarity.

[0007] In some embodiments, the protection sheet includes a first protection sheet, the first protection sheet is electrically connected to the first connection portion, and the first protection sheet and the first connection portion have the same polarity.

[0008] In some embodiments, the first connection layer further includes a second connection portion, which is electrically connected to the first connection portion, and the first protective sheet further includes a third connection portion, which is correspondingly arranged and electrically connected to the second connection portion.

[0009] In some embodiments, the first connection layer further includes a connection piece, and the connection piece is suitable for electrically connecting the first connection portion and the second connection portion.

[0010] In certain embodiments, the protection sheet includes a second protection sheet, and the second protection sheet is non-polar.

[0011] In some embodiments, an orthographic projection of the first connecting portion on a projection plane perpendicular to the first direction is located within an orthographic projection of the protective sheet on the projection plane.

[0012] In certain embodiments, the area of ​​the protection sheet is larger than the area of ​​the first connecting portion.

[0013] In certain embodiments, there are a plurality of the first connecting portions, a corresponding plurality of the protective sheets, and at least some of the plurality of the first connecting portions have different polarities.

[0014] In some embodiments, there are multiple second connection layers, and the multiple second connection layers are stacked in sequence along the first direction.

[0015] In some embodiments, the first connection portion includes a pad, and the pad is suitable for welding to a tab of the battery cell.

[0016] In some embodiments, the battery protection plate further includes a third connection layer; along the first direction, the third connection layer is provided on a side of the second connection layer away from the first connection layer, and the third connection layer is electrically connected to the second connection layer.

[0017] In certain embodiments, the protective sheet is a metal piece.

[0018] The present application also provides a battery assembly, which includes the battery protection plate described in any one of the above.

[0019] The present application also provides an electrical device, which includes the battery assembly described in any of the above embodiments.

[0020] The battery protection plate of the present application sets the first connection part and the protection sheet to the same polarity, or sets the protection sheet to be non-polar. Even if the first connection part is pierced during laser welding, it will continue to be welded to the protection sheet of the second connection layer. Since the protection sheet of the second connection layer and the first connection part have the same polarity or the protection sheet is non-polar, the welding process will not cause a short circuit of the battery protection plate. Therefore, the battery cell tab can be directly welded to the battery protection board pad, eliminating the nickel sheet of the battery protection board and reducing production costs.

[0021] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 It is a schematic diagram of the structure of the battery protection board provided in the embodiment of this application.

[0024] Description of main component symbols:

[0025] 1000 - first connection layer; 2000 - second connection layer; 2100 - first sub-connection layer of the second connection layer; 2200 - second sub-connection layer of the second connection layer; 2300 - third sub-connection layer of the second connection layer; 2400 - fourth sub-connection layer of the second connection layer; 3000 - third connection layer;

[0026] 1100 - first connection part; 1011 - first sub-connection part of the first connection part; 1021 - second sub-connection part of the first connection part; 1031 - third sub-connection part of the first connection part; 1041 - fourth sub-connection part of the first connection part; 1032 - fifth sub-connection part of the first connection part; 1051 - sixth sub-connection part of the first connection part;

[0027] 2003-protection film;

[0028] 2001 - first protection sheet; 2120 - first protection sheet, first sub-protection sheet; 2140 - first protection sheet, second sub-protection sheet; 2220 - first protection sheet, third sub-protection sheet; 2320 - first protection sheet, fourth sub-protection sheet; 2340 - first protection sheet, fifth sub-protection sheet; 2420 - first protection sheet, sixth sub-protection sheet; 2440 - first protection sheet, seventh sub-protection sheet; 2410 - first protection sheet, eighth sub-protection sheet;

[0029] 2002 - second protective sheet; 2110 - first sub-protection sheet of the second protective sheet; 2210 - second sub-protection sheet of the second protective sheet; 2310 - third sub-protection sheet of the second protective sheet; 2410 - fourth sub-protection sheet of the second protective sheet;

[0030] 1200 - second connection part; 1022 - first sub-connection part of the second connection part; 1042 - second sub-connection part of the second connection part;

[0031] 2030 - third connection part; 2122 - first sub-connection part of the third connection part; 2142 - second sub-connection part of the third connection part; 2221 - third sub-connection part of the third connection part; 2222 - fourth sub-connection part of the third connection part;

[0032] 300-connecting piece; 1020-first connecting piece; 1040-second connecting piece; 1030-third connecting piece DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and should not be understood as limiting the embodiments of the present application.

[0034] In the description of the present application, it should be understood that the terms "thickness", "upper", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0035] This application provides a battery protection board that allows battery cell tabs to be directly welded to the board's pads. This prevents welding through the tabs and causing a short circuit in the board. The battery protection board provided by this application eliminates the need for nickel sheeting, reducing production costs.

[0036] A battery protection plate provided herein includes a first connection layer 1000 and a second connection layer 2000. The first connection layer 1000 includes a first connection portion 1100; the second connection layer 2000 includes a protective sheet 2003. The first connection layer 1000 and the second connection layer 2000 are stacked along a first direction X, which is the direction in which the first and second connection layers 1000 and 2000 are stacked. The first connection layer 1000 and the second connection layer 2000 are electrically connected. The protective sheet 2003 is disposed corresponding to the first connection portion 1100, and the polarity of the protective sheet 2003 is the same as that of the corresponding first connection portion 1100, or the protective sheet 2003 has no polarity. Therefore, when the first connection portion 1100 is welded through, the protective sheet 2003 can be welded on. Since the protective sheet 2003 and the first connection portion 1100 have the same polarity or the protective sheet 2003 has no polarity, welding the protective sheet will not short-circuit the protection plate.

[0037] The first connection layer 1000 is the outermost layer of the battery protection board used for welding. Usually, the surface of the first connection layer 1000 is arranged with related components that realize the functions of the circuit board, wire output pads, plug-in thermistor pads, and pads electrically connected to the battery cells. The components include but are not limited to field effect transistors, resistors, capacitors, etc., which are not described in detail here. The other side of the first connection layer 1000 away from the components is stacked with the second connection layer 2000. The protective sheet 2003 and the first connection part 1100 are correspondingly arranged. When the protective sheet 2003 can be the same polarity as the first connection part 1100, the protective sheet 2003 and the first connection part 1100 have the same polarity. If the first connection part 1100 is penetrated during spot welding, it will continue to be welded to the protective sheet 2003, so that the first connection part 1100 and the protective sheet 2003 form an electrical connection. Since the protective sheet 2003 and the first connection part 1100 are of the same polarity, the battery protection board will not be short-circuited after the protective sheet 2003 is penetrated.

[0038] In some embodiments, the protection sheet 2003 has no polarity. If the first connection portion 1100 is welded through, it will be welded to the protection sheet 2003. Since the protection sheet 2003 has no polarity, welding to the protection sheet 2003 will not cause a short circuit in the protection board.

[0039] In some embodiments, multiple first connecting portions 1100 may be provided, and multiple protective sheets 2003 may be provided correspondingly, with at least some of the multiple first connecting portions having different polarities. Thus, when the first connecting portion 1100 is welded through, the protective sheet 2003 may be welded on. Because the protective sheet 2003 and the first connecting portion 1100 have the same polarity or the protective sheet 2003 has no polarity, welding the protective sheet will not short-circuit the protective plate.

[0040] See also Figure 1 The first connection layer 1000 is provided with a plurality of first connection parts 1100, which are respectively the first connection part second sub-connection part 1021 and the first connection part fourth sub-connection part 1041; the corresponding plurality of second connection layers 2000 are respectively the second connection layer first sub-connection layer 2100, the second connection layer second sub-connection layer 2200, the second connection layer third sub-connection layer 2300, and the second connection layer fourth sub-connection layer 2400. In some embodiments, the protective sheet 2003 includes the first protective sheet 2001. Please refer to Figure 1The multiple first protection sheets 2001 are respectively a first protection sheet first sub-protection sheet 2120, a first protection sheet second sub-protection sheet 2140, a first protection sheet third sub-protection sheet 2220, a first protection sheet fourth sub-protection sheet 2320, a first protection sheet fifth sub-protection sheet 2340, a first protection sheet sixth sub-protection sheet 2420, and a first protection sheet seventh sub-protection sheet 2440. When the first connection portion second sub-connection portion 1021 and the first connection portion fourth sub-connection portion 1041 are welded through, the first protection sheet first sub-protection sheet 2120 and the first protection sheet second sub-protection sheet 2140 will continue to be welded. Since the first protection sheet second sub-protection sheet 2140 and the first connection portion fourth sub-connection portion 1041 have the same polarity, welding the first protection sheet first sub-protection sheet 2120 and the first protection sheet second sub-protection sheet 2140 will not cause a short circuit in the protection plate. By analogy, when welding to the sixth sub-protection sheet 2420 of the first protection sheet and the seventh sub-protection sheet 2440 of the first protection sheet, they will always be welded to the first protection sheet 2001 and will not be welded to other parts of the protection plate.

[0041] In some embodiments, the first connection layer 1000 further includes a second connection portion 1200 , and the first connection portion 1100 and the second connection portion 1200 are electrically connected via a connection sheet 300 .

[0042] See also Figure 1 The connecting piece 300 includes a first connecting piece 1020 and a second connecting piece 1040. The second connecting portion 1200 includes a first sub-connecting portion 1022 and a second sub-connecting portion 1042. The first sub-connecting portion 1022 and the second sub-connecting portion 1021 are electrically connected via the first connecting piece 1020. The second sub-connecting portion 1042 and the fourth sub-connecting portion 1041 are electrically connected via the second connecting piece 1040.

[0043] In some embodiments, the first protective sheet 2001 further includes a third connecting portion 2030, which is disposed correspondingly to the second connecting portion 1200. When the first connecting layer 1000 and the second connecting layer 2000 are stacked, the second connecting portion 1200 and the third connecting portion 2030 can be electrically connected, thereby achieving electrical connection between the first connecting portion 1100 and the first protective sheet 2001.

[0044] See also Figure 1The third connection portion 2030 includes a first sub-connection portion 2122, a second sub-connection portion 2142, a third sub-connection portion 2221, and a fourth sub-connection portion 2222. The first sub-connection portion 2122 is provided on the first protective sheet 2120, the second sub-connection portion 2142 is provided on the first protective sheet 2140, and the third sub-connection portion 2221 and the fourth sub-connection portion 2222 are provided on the third sub-protection sheet 2220. When the first connection layer 1000, the second connection layer first sub-connection layer 2100, and the second connection layer second sub-connection layer 2200 are stacked in sequence, the first connection part second sub-connection part 1021, the first connection part fourth sub-connection part 1041, the second connection part first sub-connection part 1022, the third connection part first sub-connection part 2122, the third connection part second sub-connection part 2142, the third connection part third sub-connection part 2221, and the third connection part fourth sub-connection part 2222 are electrically connected. At this time, the first connection part second sub-connection part 1021, the first connection part fourth sub-connection part 1041, the first protective sheet first sub-protection sheet 2120, the first protective sheet second sub-protection sheet 2140, and the first protective sheet third sub-protection sheet 2220 all have the same polarity.

[0045] When the second sub-connection portion 1021 of the first connection portion is welded through, welding will continue to the first protection sheet, the first sub-protection sheet 2120. Since the first protection sheet, the first sub-protection sheet 2120 and the second sub-connection portion 1021 of the first connection portion have the same polarity, welding the first protection sheet, the first sub-protection sheet 2120 will not short-circuit the protection plate. If the first sub-protection sheet 2120 of the first protection sheet is welded through, welding will continue to the third sub-protection sheet 2220 of the first protection sheet, and so on, until welding reaches the sixth sub-protection sheet 2420 of the first protection sheet. At this time, since the second sub-connection portion 1021 of the first connection portion, the first sub-protection sheet 2120 of the first protection sheet, the third sub-protection sheet 2220 of the first protection sheet, the fourth sub-protection sheet 2320 of the first protection sheet, and the sixth sub-protection sheet 2420 of the first protection sheet all have the same polarity, welding through the sixth sub-protection sheet 2420 of the first protection sheet will not short-circuit the protection plate.

[0046] When the fourth sub-connection portion 1041 of the first connection portion is welded through, welding will continue to the second sub-protection sheet 2140 of the first protection sheet. Since the second sub-protection sheet 2140 and the fourth sub-connection portion 1041 of the first connection portion have the same polarity, welding the second sub-protection sheet 2140 of the first protection sheet will not short-circuit the protection plate. If the second sub-protection sheet 2140 of the first protection sheet is welded through, welding will continue to the third sub-protection sheet 2220 of the first protection sheet, and so on, until welding reaches the seventh sub-protection sheet 2440 of the first protection sheet. At this time, since the second sub-connection portion 1021 of the first connection portion, the first sub-protection sheet 2120 of the first protection sheet, the third sub-protection sheet 2220 of the first protection sheet, the fifth sub-protection sheet 2340 of the first protection sheet, and the seventh sub-protection sheet 2440 of the first protection sheet all have the same polarity, welding through to the sixth sub-protection sheet 2420 of the first protection sheet will not short-circuit the protection plate.

[0047] In some embodiments, the first protection sheets 2001 are all metal sheets.

[0048] In some embodiments, part or all of the first protective sheet 2001 may not be a metal sheet. In this case, if the second sub-connection portion 1021 of the first connecting portion is welded through, since the first protective sheet 2001 does not contain metal, it is very easy to penetrate the first protective sheet 2001 during welding. Therefore, the preferred solution of the present application is that the first protective sheet 2001 is made of metal to improve the reliability of the embodiments of the present application.

[0049] In some embodiments, the protective sheet 2003 further includes a second protective sheet 2002, which is positioned corresponding to the first connecting portion 1100. The second protective sheet 2002 is non-polarized, meaning that it is not electrically connected to any other components of the protective board. When the first connecting layer 1000 and the second connecting layer 2000 are stacked, if the first connecting portion 1100 is penetrated by soldering, soldering to the second protective sheet 2002 will continue. Since the second protective sheet 2002 is non-polarized, soldering to the second protective sheet 2002 will not cause a short circuit in the circuit board.

[0050] Please continue reading Figure 1, multiple second protection sheets 2002 are respectively the first sub-protection sheet 2110 of the second protection sheet, the second sub-protection sheet 2210 of the second protection sheet, and the third sub-protection sheet 2310 of the second protection sheet, and the first protection sheet 2001 is also the eighth sub-protection sheet 2410 of the first protection sheet. The first connecting portion 1100 is also the first sub-connecting portion 1011 of the first connecting portion, and the second protection sheet 2002 and the first protection sheet 2001 and the first sub-connecting portion 1011 of the first connecting portion are correspondingly arranged. When the first sub-connecting portion 1011 of the first connecting portion is welded through, the first sub-protection sheet 2110 of the second protection sheet will continue to be welded. Since the first sub-protection sheet 2110 of the second protection sheet has no polarity at this time, that is, the first sub-protection sheet 2110 of the second protection sheet will not form an electrical connection with other components of the battery protection board, the connection formed by the first sub-connecting portion 1011 of the first connecting portion and the first sub-protection sheet 2110 of the second protection sheet due to welding will not cause a short circuit in the battery protection board. When the first sub-protection sheet 2110 of the second protective sheet is welded through, welding will continue to the second sub-protection sheet 2210, and so on, until welding reaches the third sub-protection sheet 2310 of the second protective sheet. Since the first sub-protection sheet 2110 of the second protective sheet, the second sub-protection sheet 2210 of the second protective sheet, and the third sub-protection sheet 2310 of the second protective sheet, welding to the third sub-protection sheet 2310 of the second protective sheet will not short-circuit the battery protection board. Since the eighth sub-protection sheet 2410 of the first protective sheet and the first sub-connection portion 1011 of the first connecting portion have the same polarity, even if the third sub-protection sheet 2310 of the second protective sheet is welded through, welding to the eighth sub-protection sheet 2410 of the first protective sheet will still not short-circuit the battery protection board.

[0051] It can be seen from this that the protection sheets 2003 on different second connection layers 2000 can all maintain the same polarity as the first connection portion 1100, or some can be non-polar. Figure 1 The first sub-protective sheet 2110, the second sub-protective sheet 2210, and the third sub-protective sheet 2310 of the second protective sheet corresponding to the first sub-connection part 1011 of the first connection part are non-polar, but the eighth sub-protective sheet 2410 of the first protective sheet has polarity. Therefore, when the first connection part 1100 is welded through, the protective sheet 2003 will continue to be welded. Since the protective sheet 2003 and the first connection part 1100 have the same polarity or the protective sheet 2003 has no polarity, welding the protective sheet at this time will not cause the protective plate to short-circuit.

[0052] It should be noted that the second protective sheet 2002 can be entirely metal, or partially or entirely non-metallic. To prevent the second protective sheet 2002 from being penetrated by welding, the second protective sheet 2002 is preferably made of metal to better prevent the second connecting layer 2000 of the present application from being penetrated by welding, thereby improving the reliability of the battery protection board. Of course, the material of the second protective sheet 2002 in the present application can also be other non-metallic materials, as long as it can prevent further penetration of the connecting layer by welding, and no specific limitation is made here.

[0053] In some embodiments, the orthographic projection of the first connecting portion 1100 on a projection plane perpendicular to the first direction X is located within the orthographic projection of the protective sheet 2003 on the projection plane, and the area of ​​the protective sheet 2003 is larger than the area of ​​the corresponding first connecting portion 1100. Therefore, when the first connecting portion 1100 is welded through, the protective sheet 2003 will continue to be welded. Since the protective sheet 2003 and the first connecting portion 1100 have the same polarity or the protective sheet 2003 has no polarity, welding the protective sheet will not cause a short circuit in the protective plate.

[0054] See also Figure 1 The orthographic projection of the first connecting portion 1100 on the projection plane perpendicular to the first direction X is located within the orthographic projection of the protective sheet 2003 on the projection plane, thereby ensuring that welding is carried out on the protective sheet and will not be welded to other areas of the connecting layer.

[0055] In some embodiments, the area of ​​the protection sheet 2003 is larger than the area of ​​the first connecting portion 1100. Figure 1 The areas of the first protective sheet 2001 and the second protective sheet 2002 are both larger than the corresponding areas of the first connecting portion 1100. This ensures that even if the weld expands during welding, the weld remains on the protective sheet. Consequently, when the first connecting portion 1100 is penetrated, welding continues on to the protective sheet 2003. Because the protective sheet 2003 and the first connecting portion 1100 have the same polarity, or the protective sheet 2003 has no polarity, welding the protective sheets will not short-circuit the protective plate.

[0056] In some embodiments, all the protection sheets 2003 on the battery protection board of the present application may be non-polar or have the same polarity as the corresponding first connecting portion, or may be Figure 1 The protective sheet 2003 shown includes a first protective sheet 2001 and a second protective sheet 2002. Whether the protective sheet 2003 has polarity depends on the actual circuit design of the battery protection board and is not specifically limited here.

[0057] In some embodiments, the second connection part 1200 and / or the third connection part 2030 are a number of vias that penetrate the connection layer. The corresponding setting of the vias can realize the electrical connection of the various connection layers that constitute the protection plate. Other connection parts that can realize the electrical connection of the connection layers are also within the protection scope of this application and are not limited here.

[0058] In some embodiments, there are multiple first connection portions 1100, and correspondingly, multiple protective sheets 2003, and at least some of the first connection portions 1100 have different polarities. Since battery cells have positive and negative electrodes, the protection board needs to provide first connection portions 1100 of different polarities to electrically connect to the positive and negative electrodes of the battery cells, respectively. Therefore, the present application provides a battery protection board with at least some of the first connection portions 1100 having different polarities, thereby achieving connection between the battery protection board and the battery cells.

[0059] In certain embodiments, a battery protection plate provided in the present application further includes a third connection layer 3000. Along the first direction X, the third connection layer is arranged on the side of the second connection layer 2000 away from the first connection layer 1000, and the third connection layer 3000 is electrically connected to the second connection layer 2000.

[0060] The battery protection board provided in this application is generally a battery protection board with four, six or eight connecting layers. Figure 1 In the embodiment of the present invention, the battery protection board of this embodiment includes a total of six connection layers. The third connection layer 3000, which is farthest from the first connection layer 1000, is not designed with an area with the same polarity as the first connection layer 1000 and the second connection layer 2000. That is, the third connection layer 3000 is not the second connection layer. In other words, the third connection layer 3000 does not need to be provided with a protective sheet, and the third connection layer 3000 can be designed as needed. In some embodiments, the area on the third connection layer 3000 corresponding to the first connection part may have the opposite polarity to the first connection part. Therefore, the second connection layer 2000 needs to be provided between the third connection layer 3000 and the first connection part to prevent the circuit board from being short-circuited by welding from the first connection part to the third connection layer.

[0061] In some embodiments, the second connection layer 2000 may have only one layer, that is, a layer that is close to the first connection layer 1000, and the remaining third connection layers that are close to the second connection layer 2000 in turn do not need to be designed with a protective sheet 2003, so that welding to the second connection layer will not cause a short circuit in the circuit board.

[0062] In some embodiments, the battery protection board may design all connection layers except the first connection layer 1000 as the second connection layer 2000. In this case, even if the entire battery protection board is welded through, no short circuit will occur.

[0063] It should be noted that the material used to make the battery protection plate is generally copper, so the protection sheet 2003 can be a copper sheet, or the protection sheet 2003 can be set to other metal materials during the manufacturing process, as long as it can prevent further welding through the protection sheet. No specific restrictions are made here.

[0064] This application also provides an embodiment of a battery assembly, in which the battery assembly includes at least one battery cell and any of the battery protection boards described above, wherein the battery cell and the battery protection board are electrically connected. Because the battery assembly utilizes the battery protection board described above, the battery assembly also possesses the technical effects of the battery protection board described above.

[0065] In some embodiments, the battery protection board and the battery cell are electrically connected. Since the battery cell has a positive and negative tab with opposite polarity, the positive and negative tabs of the battery cell need to be welded to different pads on the battery protection board. The polarity of different pads is opposite, and the pads connected to the positive and negative tabs of the same battery cell are insulated from each other. In the embodiments of the present application, the first connection portion is usually a pad, and the welding method is usually laser spot welding. Other first connection portions and welding methods that can be welded are within the scope of protection of this application and are not limited here. Please refer to Figure 1, the multiple first connection parts 1100 are respectively the third sub-connection part 1031 of the first connection part, the fifth sub-connection part 1032 of the first connection part, and the sixth sub-connection part 1051 of the first connection part. The connecting piece 300 also includes a third connecting piece 1030, which electrically connects the third sub-connection part 1031 of the first connection part and the fifth sub-connection part 1032 of the first connection part. The positive electrode ear of the first battery cell (not shown) is welded to the first sub-connection part 1011 of the first connection part, and the negative electrode ear of the first battery cell is welded to the third sub-connection part 1031 of the first connection part. At this time, the polarity of the first sub-connection part 1011 of the first connection part and the third sub-connection part 1031 of the first connection part are opposite. When multiple battery cells need to be connected in the battery assembly, the battery cells can be connected in series or in parallel by designing the battery protection board. For example, the positive electrode ear of the second battery cell (not shown) is welded to the fifth sub-connection part 1032 of the first connection part, and the negative electrode ear of the second battery cell is welded to the second sub-connection part 1021 of the first connection part; since the third connecting piece 1030 electrically connects the third sub-connection part 1031 of the first connection part and the fifth sub-connection part 1032 of the first connection part, the first battery cell and the second battery cell are connected in series. The positive electrode ear of the third battery cell (not shown) is electrically connected to the second sub-connection part 1041 of the first connection part, and the negative electrode ear of the third battery cell is welded to the sixth sub-connection part 1051 of the first connection part. Since the second sub-connection part 1021 of the first connection part and the fourth sub-connection part 1041 of the first connection part are electrically connected through the second sub-connection layer 2200 of the second connection layer, the first battery cell, the second battery cell, and the third battery cell are connected in series through the battery protection plate. In the embodiment of the present application, there is no restriction on the number of the first connection parts 1100 , that is, the battery protection board of the present application can realize the series connection or parallel connection of multiple battery cells, which will not be elaborated here.

[0066] This application also provides an embodiment of an electrical device, in which the electrical device includes any of the above-described batteries. Because the electrical device uses the above-described battery assembly, the electrical device also has the technical effects of the above-described battery protection board. The electrical device includes, but is not limited to, mobile phones, laptop computers, tablet computers, and two- or three-wheeled electric vehicles.

[0067] Throughout this specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, for example, two or three, unless otherwise specifically defined.

[0069] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery protection board, characterized in that: The battery protection board includes: A first connecting layer, the first connecting layer comprising a first connecting portion, the first connecting portion being used for welding a tab of the battery cell; a second connecting layer, the second connecting layer comprising a protective sheet; Along a first direction, the first connection layer and the second connection layer are stacked, and the first connection layer and the second connection layer are electrically connected; The protection sheet is provided corresponding to the first connection portion, and the polarity of the protection sheet is the same as that of the first connection portion, or the protection sheet has no polarity.

2. The battery protection board according to claim 1, characterized in that: The protection sheet includes a first protection sheet, the first protection sheet is electrically connected to the first connection portion, and the first protection sheet and the first connection portion have the same polarity.

3. The battery protection board according to claim 2, characterized in that: The first connection layer further includes a second connection portion, which is electrically connected to the first connection portion; the first protection sheet further includes a third connection portion, which is correspondingly arranged and electrically connected to the second connection portion.

4. The battery protection board according to claim 3, characterized in that: The first connection layer further includes a connection piece, and the connection piece is suitable for electrically connecting the first connection portion and the second connection portion.

5. The battery protection board according to claim 1, characterized in that: The protection sheet includes a second protection sheet, and the second protection sheet has no polarity.

6. The battery protection board according to any one of claims 1 to 5, characterized in that: An orthographic projection of the first connecting portion on a projection plane perpendicular to the first direction is located within an orthographic projection of the protective sheet on the projection plane.

7. The battery protection board according to any one of claims 1 to 5, characterized in that: The area of ​​the protection sheet is larger than that of the first connecting portion.

8. The battery protection board according to any one of claims 1 to 5, characterized in that: There are a plurality of the first connecting parts, and a corresponding plurality of the protective sheets, and at least some of the plurality of the first connecting parts have different polarities.

9. The battery protection board according to any one of claims 1 to 5, characterized in that: There are a plurality of second connection layers, and the plurality of second connection layers are stacked in sequence along the first direction.

10. The battery protection board according to any one of claims 1 to 5, characterized in that: The first connecting portion includes a welding pad, and the welding pad is suitable for welding to the tab of the battery cell.

11. The battery protection board according to any one of claims 1 to 5, characterized in that: The battery protection plate further includes a third connection layer; along the first direction, the third connection layer is provided on a side of the second connection layer away from the first connection layer, and the third connection layer is electrically connected to the second connection layer.

12. The battery protection board according to any one of claims 1 to 5, characterized in that: The protection sheet is a metal piece.

13. A battery assembly, characterized in that: The battery protection plate comprises at least one battery cell and any one of claims 1 to 12, wherein the first connecting portion is welded to the tab of the battery cell.

14. An electrical device, characterized in that: A battery assembly comprising the battery assembly described in claim 13.

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