Battery protection board and battery

Abstract

The utility model provides a battery protection plate and a battery, and relates to the technical field of batteries. The battery protection board comprises a printed circuit board and a connecting piece, the printed circuit board comprises a first mounting surface and a placement groove, the first mounting surface is located on one side of the printed circuit board in the thickness direction and faces the battery cell, and the placement groove is recessed towards the interior of the printed circuit board from the first mounting surface in the thickness direction; the connecting piece is used for being connected with a tab included in the battery cell, and at least part of the connecting piece is located in the placement groove. When the battery protection plate is connected with the battery cell, the length direction of the battery cell is parallel to the thickness direction, the connecting piece is connected with the tab, the first mounting surface faces the battery cell, the connecting piece is fixed in the placement groove, and at least part of the placement groove is located in the placement groove. Therefore, the space occupied by the connecting piece connected with the tab in the thickness direction is reduced, and the space capable of being occupied by the battery cell in a limited space is increased, so that the capacity density of the battery is improved.

Description

Technical Field

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

[0002] The battery protection board (Protection Circuit Module, PCM for short) is an important component that protects the battery from overcharge, over-discharge and short circuit. The battery protection board includes a flexible printed circuit (FPC) and a printed circuit board (PCB). A nickel sheet is provided on the surface of the printed circuit board, and the tabs of the soft-pack battery are welded on the nickel sheet. However, the battery protection board occupies a large space in the length direction of the battery, which reduces the space occupied by the battery cell in a limited space, thereby affecting the capacity density of the battery. Utility Model Content

[0003] In view of this, the present application provides a battery protection board and a battery to solve the problem that the battery protection board occupies a large space in the length direction of the battery, which reduces the space occupied by the battery cell in a limited space, thereby affecting the capacity density of the battery.

[0004] According to one aspect of the present application, a battery protection board is provided, the battery protection board comprising a printed circuit board and a connector, the printed circuit board comprising a placement groove, the placement groove being located on one side of the printed circuit board in a thickness direction, the placement groove being recessed toward the inside of the printed circuit board along the thickness direction;

[0005] The connecting piece is used to be connected to the tab of the battery cell, and at least a portion of the connecting piece is located in the placement groove.

[0006] Preferably, the depth of the seating groove is greater than or equal to the dimension of the connecting member in the thickness direction.

[0007] Preferably, the depth of the seating groove is greater than or equal to the sum of the thickness of the tab and the dimension of the connector in the thickness direction.

[0008] Preferably, the battery protection plate includes a plurality of placement grooves and a plurality of connecting members, the plurality of placement grooves are arranged at intervals along the length direction, the plurality of placement grooves correspond one-to-one to the plurality of connecting members, the connecting members are arranged in the placement grooves corresponding to the connecting members, and the length direction intersects with the thickness direction.

[0009] Preferably, the battery protection board also includes a flexible circuit board, and the printed circuit board also includes a first mounting surface, a second mounting surface and an electronic device, the first mounting surface and the second mounting surface are respectively located on both sides of the printed circuit board in the thickness direction, the first mounting surface is used to face the battery cell, the electronic device is fixed on the second mounting surface, and the flexible circuit board is connected to the second mounting surface.

[0010] Preferably, the placement groove runs through at least one side of the printed circuit board in the width direction;

[0011] And / or, it also includes a pole lug groove, which is opened on one side of the accommodation groove that passes through the printed circuit board in the width direction, and the pole lug groove is recessed toward the interior of the printed circuit board along the width direction of the printed circuit board, and the pole lug groove is connected with the accommodation groove, and the pole lug groove is used to accommodate the pole lug.

[0012] According to another aspect of the present application, a battery is provided, the battery comprising a battery cell and the above-mentioned battery protection board, the battery cell comprising a pole ear, and the pole ear is connected to the connecting piece.

[0013] Preferably, the battery cell also includes a packaging film and a bare battery cell, the packaging film includes a packaging body and a top sealing edge connected to each other, the top sealing edge is bent toward the top of the packaging body, the bare battery cell is wrapped inside the packaging body, the pole ear is connected to the bare battery cell, the pole ear extends from the top sealing edge, and the connecting piece faces the top sealing edge.

[0014] Preferably, the battery cell further comprises two side seals, the two side seals are respectively connected to two sides of the packaging body, and the two side seals are both connected to the top seal;

[0015] The battery comprises a plurality of battery cells, the plurality of battery cells are arranged along the width direction of the battery cells, and the two side seal edges of two adjacent battery cells form a side seal foot;

[0016] The printed circuit board comprises a notch, the notch penetrates the printed circuit board along the thickness direction, and the sealing foot on one side is located in the notch.

[0017] Preferably, the battery further comprises an adhesive member, the adhesive member comprises a first adhesive surface and a second adhesive surface opposite to each other, the first adhesive surface is bonded to the top sealing edge, and the second adhesive surface is bonded to the tab.

[0018] Preferably, the battery further comprises an injection molded part, the injection molded part is connected to the side of the packaging body where the pole ear is located, and the injection molded part covers the top edge seal, the side edge seal and the printed circuit board.

[0019] When the battery protection board of the present application is connected to the battery cell, the length direction of the battery cell is parallel to the thickness direction of the printed circuit board, the connector is connected to the tab included in the battery cell, the connector is fixed in a placement groove that is recessed toward the inside of the printed circuit board, and at least part of the placement groove is located in the placement groove. In this way, the space occupied by the connector for connecting to the tab in the thickness direction is reduced, and the space that the battery cell can occupy in the limited space is increased, thereby improving the capacity density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram showing the structure of a battery protection board according to an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the structure of a printed circuit board is shown;

[0023] Figure 3 A diagram showing the relative positions of the printed circuit board and the connector;

[0024] Figure 4 Show Figure 3 A magnified view of part A;

[0025] Figure 5 A schematic diagram showing the structure of a battery;

[0026] Figure 6 Show Figure 5 A magnified view of part B;

[0027] Figure 7 Show Figure 5 Magnified view of part C.

[0028] Icons: 1-printed circuit board; 11-board body; 111-first mounting surface; 112-second mounting surface; 12-electronic device; 13-mounting groove; 14-notch; 2-flexible circuit board; 3-connector; 4-battery cell; 41-ear; 42-package body; 43-side sealing; 44-top sealing; 5-adhesive; L1-thickness direction; L2-length direction; L3-width direction. DETAILED DESCRIPTION

[0029] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0030] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0031] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0032] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0033] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0034] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0035] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0036] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0037] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0038] The following will be combined Figures 1 to 7 The battery protection board and battery of the present application are described. Figures 1 to 7 In the figure, the thickness direction L1, the length direction L2 and the width direction L3 are perpendicular to each other, the thickness direction L1 of the printed circuit board 1 is parallel to the length direction of the battery cell 4, the length direction L2 of the printed circuit board 1 is parallel to the width direction of the battery cell 4, and the width direction L3 of the printed circuit board 1 is parallel to the thickness direction of the battery cell 4.

[0039] According to one aspect of the present application, a battery protection board is provided, such as Figures 1 to 4As shown, the battery protection board includes a printed circuit board 1 and a connector 3. The printed circuit board 1 includes a placement groove 13, and the placement groove 13 is recessed toward the inside of the printed circuit board 1 along the thickness direction L1; the connector 3 is used to connect with the pole ear 41 included in the battery cell 4, and at least part of the connector 3 is located in the placement groove 13. When the battery protection board is connected to the battery cell 4, the length direction of the battery cell 4 is parallel to the thickness direction L1, the connector 3 is connected to the pole ear 41 included in the battery cell 4, the connector 3 is fixed in the placement groove 13, and at least part of the connector 3 in the thickness direction L1 is located in the placement groove 13. In this way, the space occupied by the connector 3 used to connect with the pole ear 41 in the thickness direction L1 is reduced, and the space that the battery cell 4 can occupy in the limited space is increased, thereby improving the capacity density of the battery.

[0040] In some alternative embodiments, the placement groove 13 can also be arranged on the side of the printed circuit board 1 away from the battery cell 4, and is concave toward the printed circuit board 1 along the thickness direction L1 of the printed circuit board 1, and the pole ear 41 bypasses the printed circuit board 1 and is connected to the connector 3 in the placement groove 13.

[0041] Furthermore, the placement groove 13 penetrates at least one side of the printed circuit board 1 in the width direction L3, so that the placement groove 13 forms at least one opening in the width direction L3 of the printed circuit board 1. When the connector 3 is completely located in the placement groove 13, the tab 41 can extend into the placement groove 13 through the opening of the placement groove 13, so as to be connected with the connector 3 in the placement groove 13.

[0042] Optionally, the placement groove 13 may penetrate one side of the printed circuit board 1 in the width direction L3, so that the placement groove 13 forms an opening in the width direction L3 of the printed circuit board 1; the placement groove 13 may also penetrate both sides of the printed circuit board 1 in the width direction L3, so that the placement groove 13 forms two openings in the width direction L3 of the printed circuit board 1. Through the formed opening, the tab 41 can be deeply inserted into the placement groove 13 along the opening to connect with the connector 3.

[0043] Furthermore, it also includes a tab groove, which is provided on one side of the placement groove 13 penetrating the printed circuit board 1 in the width direction, and the tab groove is recessed toward the inside of the printed circuit board 1 along the width direction L3 of the printed circuit board 1, and the tab groove is connected with the placement groove 13, and the tab groove is used to accommodate the tab 41. Specifically, when the placement groove 13 is provided on the side of the printed circuit board 1 away from the battery cell 4, a tab groove for accommodating the tab 41 can be provided in the width direction L3 of the printed circuit board 1, so that the tab 41 passes through, so that the tab 41 extends from the head of the battery cell 4 to the printed circuit board 1 and is connected with the connector 3. The tab groove penetrates both sides of the printed circuit board 1 in the thickness direction L1, and one side thereof at least partially overlaps with the side of the placement groove 13 penetrating the printed circuit board 1 in the width direction L3, so that the tab groove can be connected with the placement groove 13.

[0044] In addition, the printed circuit board 1 includes a first mounting surface 111 and a second mounting surface 112 facing each other in the thickness direction, and the first mounting surface 111 faces the battery cell 4. The placement groove 13 can be recessed from the first mounting surface 111 along the thickness direction L1 toward the inside of the printed circuit board 1, and at this time, the tab 41 of the battery cell 4 is directly connected to the connector 3 in the placement groove 13. The placement groove 13 can also be recessed from the second mounting surface 112 along the thickness direction L1 toward the inside of the printed circuit board 1, and at this time, the tab 41 of the battery cell 4 can pass over the printed circuit board 1 and connect to the connector 3 located in the placement groove 13.

[0045] In the embodiments of the present application, Figure 4 As shown, the depth of the placement groove 13 can be greater than or equal to the size of the connector 3 in the thickness direction L1. In this way, the space occupied by the connector 3 in the thickness direction L1 coincides with the space occupied by the placement groove 13 in the thickness direction L1, and the connector 3 does not occupy additional space in the thickness direction L1, thereby increasing the space that the battery cell 4 can occupy in the thickness direction L1, thereby increasing the space that the battery cell 4 can occupy in the thickness direction L1, thereby improving the capacity density of the battery.

[0046] Furthermore, the depth of the placement groove 13 is greater than or equal to the sum of the thickness of the pole ear 41 and the size of the connector 3 in the thickness direction L1. In this way, when the battery protection board is connected to the battery cell 4, the portion of the pole ear 41 used to connect to the battery cell 4 and the connector 3 are both located in the placement groove 13, and the space occupied by the portion of the pole ear 41 used to connect to the battery cell 4 and the connector 3 in the thickness direction L1 overlaps with the space occupied by the printed circuit board 1 in the thickness direction L1. The thickness of the pole ear 41 no longer affects the space that can be occupied by the battery cell 4 in the thickness direction L1, so that the space that can be occupied by the battery cell 4 in the thickness direction L1 is further increased, thereby further improving the capacity density of the battery.

[0047] Preferably, the depth of the placement groove 13 is equal to the sum of the thickness of the pole ear 41 and the dimension of the connector 3 in the thickness direction L1. When the battery protection plate and the battery cell 4 are welded, the pole ear 41 can extend into the placement groove 13 through the opening of the placement groove 13, so as to be welded with the connector 3 in the placement groove 13. At this time, the surface of the portion of the pole ear 41 used for connecting with the connector 3 facing away from the connector 3 is flush with the first mounting surface 111.

[0048] Optionally, the connecting member 3 may be a nickel sheet, a nickel brick or a nickel block, and the nickel sheet may be a “U”-shaped nickel sheet.

[0049] In an embodiment of the present application, the battery protection board includes a plurality of placement grooves 13 and a plurality of connectors 3, the plurality of placement grooves 13 are arranged at intervals along the length direction L2, the plurality of placement grooves 13 correspond one-to-one to the plurality of connectors 3, the connectors 3 are arranged in the placement grooves 13 corresponding to the connectors 3, and each connector 3 is connected to a different pole ear 41, so that the battery protection board can be suitable for a battery cell 4 with multiple pole ears 41 or as a battery protection board shared by multiple battery cells 4.

[0050] Furthermore, the printed circuit board 1 includes a notch 14, and the notch 14 is recessed from one side of the printed circuit board 1 in the width direction L3 to the inside of the printed circuit board 1. When the battery protection board is used as a battery protection board shared by multiple battery cells 4, the multiple battery cells 4 are arranged along the width direction of the battery cells 4 (i.e., the length direction L2 of the printed circuit board 1), and the two side sealing edges 43 of two adjacent battery cells 4 form a side sealing foot, and the side sealing foot is located in the notch 14. By setting the notch 14, the side sealing edge 43 can be avoided to ensure the stability of the installation of the battery protection board. The number of notches 14 can be selected according to the number of battery cells 4 in the battery. For example, when the number of battery cells 4 is 2, one notch 14 is set on the printed circuit board 1, and when the number of battery cells 4 is 3, two notches 14 are set on the printed circuit board 1.

[0051] Optionally, when the battery protection plate is used for a battery including only one battery cell 4 , the notch 14 may not be provided. In this case, the printed circuit board 1 is located between two side sealing edges 43 of the battery cell 4 .

[0052] Preferably, the battery protection board can be used in a battery including two battery cells 4, each battery cell 4 including two pole ears 41, and the battery protection board has four placement grooves 13, each placement groove 13 is provided with a connector 3, and each connector 3 is connected to a different pole ear 41. The battery protection board has a notch 14, and the side sealing edges 43 of two adjacent battery cells 4 are located in the notch 14.

[0053] In addition, if Figure 2 and Figure 3 As shown, the printed circuit board 1 includes a board body 11 and an electronic device 12. The board body 11 includes the above-mentioned first mounting surface 111 and the second mounting surface 112. The board body 11 is provided with the above-mentioned placement groove 13 and notch 14. The first mounting surface 111 and the second mounting surface 112 are respectively located on both sides of the printed circuit board 1 in the thickness direction L1. The electronic device 12 is fixed on the second mounting surface 112, and the flexible circuit board 2 is connected to the second mounting surface 112.

[0054] Through the battery protection plate of the present application, the part of the pole ear 41 used to connect with the battery cell 4 and the space occupied by the connector 3 in the thickness direction L1 overlap with the space occupied by the printed circuit board 1 in the thickness direction L1, so that the space that can be occupied by the battery cell 4 in the thickness direction L1 is increased, thereby improving the capacity density of the battery.

[0055] According to another aspect of the present application, a battery is provided, such as Figures 5 to 7 As shown, the battery includes a cell 4 and the above-mentioned battery protection board, the cell 4 includes a tab 41, a packaging film and a bare cell, the bare cell is wrapped inside the packaging film, the tab 41 is connected to the bare cell, the tab 41 extends from the packaging film, a portion of the tab 41 extends into the placement groove 13, and is connected to the connector 3 in the placement groove 13. The portion of the tab 41 used to connect to the cell 4 and the connector 3 are both located in the placement groove 13, so that the space occupied by the cell 4 in the thickness direction L1 is increased, and the capacity density of the battery is improved.

[0056] Furthermore, if Figure 6 As shown, the packaging film includes a packaging body 42, a top sealing edge 44 and a side sealing edge 43. The packaging body 42, the top sealing edge 44 and the side sealing edge 43 are connected in pairs, and the bare battery cell is wrapped inside the packaging body 42. The pole ear 41 is connected to the bare battery cell, the top sealing edge 44 is bent, and the pole ear 41 extends from the top sealing edge 44. The first mounting surface 111 faces the top sealing edge 44. The battery protection board is placed in this way to reduce the space occupied by the battery protection board in the thickness direction L1.

[0057] In addition, if Figure 7 As shown, the battery further includes an adhesive member 5 , which includes a first adhesive surface and a second adhesive surface opposite to each other, the first adhesive surface is bonded to the top sealing edge 44 , and the second adhesive surface is bonded to the tab 41 , thereby achieving fixation and insulation of the tab 41 .

[0058] Optionally, the adhesive member 5 is a double-sided tape.

[0059] Optionally, the battery protection plate may be applicable to a battery including two battery cells 4 or a battery including only the first battery cell 4. When the battery includes only one battery cell 4, the notch 14 may not be provided on the printed circuit board 1. For example, when the battery includes two battery cells 4, the sides of the two battery cells 4 may fit together or have a certain gap, so that the side seal 43 in one battery cell 4 fits together with the side seal 43 in the other battery cell 4, and the two fitted side seals 43 are located in the notch 14, so that the battery protection plate can avoid the side seal 43.

[0060] Preferably, the battery protection board is used in a battery including two battery cells 4 .

[0061] In addition, the battery also includes an injection molded part, which is connected to the side where the pole ear 41 of the package body 42 is located, and the injection molded part covers the top edge seal 44, the side edge seal 43 and the printed circuit board 1. In this way, the battery protection board is fixed by the injection molded part. Part of the flexible circuit board 2 extends from the injection molded part to facilitate the external connection of the battery protection board. The injection molded part can be a structure formed by low-pressure injection molding.

[0062] In the process of battery manufacturing, it is first necessary to package the bare battery cell with a packaging film to form a packaging body 42, a top seal 44 and a side seal 43, and the top seal 44 is bent toward the top of the battery cell 4. The pole ear 41 extends from the top seal 44, and after the pole ear 41 is bent toward the top seal 44, the top seal 44 and the pole ear 41 are bonded by the adhesive 5, so as to achieve the fixation of the top seal 44 and the pole ear 41. After that, the pole ear 41 is extended into the placement groove 13, and the pole ear 41 is welded to the connector 3 in the placement groove 13, so as to achieve the connection between the battery protection board and the battery cell 4. Finally, the top of the battery cell 4 is low-pressure injection molded to form an injection molded part, so that the top of the battery cell 4 and part of the battery protection board are covered inside the injection molded part, thus completing the manufacture of the entire battery.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A battery protection board, characterized in that: The battery protection board includes a printed circuit board and a connector, the printed circuit board includes a placement groove, the placement groove is located on one side of the printed circuit board in the thickness direction, and the placement groove is recessed toward the inside of the printed circuit board along the thickness direction; The connecting piece is used to be connected to the tab of the battery cell, and at least a portion of the connecting piece is located in the placement groove.

2. The battery protection board according to claim 1, characterized in that: The depth of the seating groove is greater than or equal to the dimension of the connecting member in the thickness direction.

3. The battery protection board according to claim 1, characterized in that: The depth of the placement groove is greater than or equal to the sum of the thickness of the tab and the dimension of the connector in the thickness direction.

4. The battery protection board according to any one of claims 1 to 3, characterized in that: The battery protection plate includes a plurality of placement grooves and a plurality of connectors, wherein the plurality of placement grooves are arranged at intervals along a length direction, the plurality of placement grooves correspond to the plurality of connectors one by one, and the length direction intersects with the thickness direction.

5. The battery protection board according to claim 1, characterized in that: The battery protection board also includes a flexible circuit board, and the printed circuit board also includes a first mounting surface, a second mounting surface and an electronic device, the first mounting surface and the second mounting surface are respectively located on both sides of the printed circuit board in the thickness direction, the first mounting surface is used to face the battery cell, the electronic device is fixed on the second mounting surface, and the flexible circuit board is connected to the second mounting surface.

6. The battery protection board according to any one of claims 1 to 3, characterized in that: The placement groove passes through at least one side of the printed circuit board in the width direction; And / or, it also includes a pole lug groove, which is opened on one side of the accommodation groove that passes through the printed circuit board in the width direction, and the pole lug groove is recessed toward the interior of the printed circuit board along the width direction of the printed circuit board, and the pole lug groove is connected with the accommodation groove, and the pole lug groove is used to accommodate the pole lug.

7. A battery, characterized in that: The battery comprises a battery cell and a battery protection plate according to any one of claims 1 to 6, wherein the battery cell comprises a tab, and the tab is connected to the connector.

8. The battery according to claim 7, characterized in that The battery cell also includes a packaging film and a bare battery cell, the packaging film includes a packaging body and a top sealing edge connected to each other, the top sealing edge is bent toward the top of the packaging body, the bare battery cell is wrapped inside the packaging body, the pole ear is connected to the bare battery cell, the pole ear extends from the top sealing edge, and the connecting piece faces the top sealing edge.

9. The battery according to claim 8, characterized in that The battery cell further comprises two side seals, the two side seals are respectively connected to two sides of the packaging body, and the two side seals are both connected to the top seal; The battery comprises a plurality of battery cells, the plurality of battery cells are arranged along the width direction of the battery cells, and the two side seal edges of two adjacent battery cells form a side seal foot; The printed circuit board comprises a notch, the notch penetrates the printed circuit board along the thickness direction, and the sealing foot on one side is located in the notch.

10. The battery according to claim 8, characterized in that The battery further includes an adhesive member, wherein the adhesive member includes a first adhesive surface and a second adhesive surface opposite to each other, wherein the first adhesive surface is bonded to the top sealing edge, and the second adhesive surface is bonded to the tab.

11. The battery according to claim 9, characterized in that The battery further comprises an injection molded part, which is connected to the side of the packaging body where the pole ear is located, and the injection molded part covers the top edge seal, the side edge seal and the printed circuit board.

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