Battery cell and battery

Abstract

The utility model provides a kind of electric core and battery, it is related to battery technical field.Electric core includes pole group, tab and encapsulation film, tab is connected with pole group, encapsulation film includes the encapsulation main body, top sealing edge and two side sealing edges connected, encapsulation main body covers pole group, part of tab is from top sealing edge and projects;Side sealing edge is bent to the part of protruding along the length direction of electric core relative to encapsulation main body, to make the part of protruding along the length direction of electric core relative to encapsulation main body of side sealing edge after folding is divided into first side seal part and second side seal part by crease, one side of first side seal part is connected with top sealing edge, the other side of first side seal part is connected with second side seal part, crease makes second side seal part fold towards first side seal part.In the battery with multiple electric cores, the avoiding groove on hard plate can accommodate two adjacent side sealing edges, and the hard plate no longer interferes with the two adjacent side sealing edges.Cutting is not needed for side sealing edge, which avoids battery reliability failure caused by side sealing edge cracking.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell and battery. Background Technology

[0002] With the development of battery technology, batteries with multiple cells are becoming increasingly widely used. In batteries with multiple cells, the battery protection board needs to span across multiple cells to ensure that the tabs of all cells are connected to the protection board. However, the two side seals of two adjacent cells can interfere with the rigid plate of the battery protection board. Therefore, slots are typically made in the rigid plate to accommodate the two side seals of two adjacent cells. However, due to the limitations of the wiring requirements and temperature control requirements of the battery protection board, the size of the slots in the rigid plate is limited, and interference between the rigid plate and the two side seals of two adjacent cells will still occur.

[0003] In addition, a portion of the side seal can be cut off to avoid interference between the two side seals of two adjacent cells and the rigid board. However, cutting off a portion of the side seal poses a risk of the side seal cracking, which could lead to cell reliability failure. Utility Model Content

[0004] In view of this, this application provides a battery cell and a battery to solve the problem that there is interference between the side seal and the rigid plate, and that there is a risk of battery cell reliability failure after the side seal is partially cut off.

[0005] According to one aspect of this application, a battery cell is provided, the battery cell including an electrode group, tabs and an encapsulation film, the tabs being connected to the electrode group, the encapsulation film including an encapsulation body, a top sealing edge and two side sealing edges connected to each other, the top sealing edge extending from the top of the encapsulation body, the two side sealing edges extending from both sides of the encapsulation body respectively, the encapsulation body covering the electrode group, and a portion of the tabs extending from the top sealing edge;

[0006] The side seal is bent relative to the encapsulation body along the length of the cell. The crease after bending divides the portion of the side seal relative to the encapsulation body along the length into a first side seal and a second side seal. One side of the first side seal is connected to the top seal, and the other side of the first side seal is connected to the second side seal. The crease causes the second side seal to fold towards the first side seal.

[0007] Preferably, the first side seal and the top seal form an accommodating space, and the second side seal is located within the accommodating space.

[0008] Preferably, the second side seal portion has a dimension greater than or equal to 1 mm in the length direction of the battery cell.

[0009] Preferably, the packaging body includes two reference planes that are opposite to each other in the thickness direction of the battery cell, and the angle between the crease and the reference plane is greater than or equal to 5 degrees and less than or equal to 85 degrees.

[0010] Preferably, the plane of the first side seal facing away from the second side seal is a first plane, and the surface of the second side seal facing away from the first side seal is a second plane. The angle between the first plane and the second plane in one of the side seal edges is greater than or equal to 0 degrees and less than or equal to 30 degrees.

[0011] Preferably, the angle between the first plane and the second plane in one of the side seals is 10 degrees.

[0012] According to another aspect of this application, a battery is provided, the battery including a battery protection board and at least two of the above-described battery cells, the at least two of the battery cells being arranged along the width direction of the battery cells;

[0013] The battery protection board has a clearance groove, and the two adjacent side seals of two adjacent battery cells are located in the clearance groove.

[0014] Preferably, the battery protection board includes a rigid board and a plurality of components. The rigid board has the clearance groove. The rigid board includes a first fabric surface and a second fabric surface that are opposite to each other in the length direction. The plurality of components are disposed on the first fabric surface or the second fabric surface.

[0015] Preferably, the battery protection board includes an electrical connector, which is connected to the rigid plate on one side of the battery cell in the thickness direction;

[0016] The battery cell includes tabs, and each tab is provided with a corresponding electrical connector. The tabs are electrically connected to the corresponding electrical connectors.

[0017] Preferably, the battery further includes an injection molded part and a surrounding adhesive film, each of the battery cells is connected to the injection molded part, and the rigid plate and the plurality of components are all encased in the injection molded part;

[0018] The battery also includes a surrounding adhesive tape that surrounds the injection molded part.

[0019] In the battery cell of this application, the cell includes an electrode assembly, tabs, and an encapsulation film. The tabs are connected to the electrode assembly. The encapsulation film includes a connected encapsulation body, a top seal, and two side seals. The top seal extends from the top of the encapsulation body, and the two side seals extend from the sides of the encapsulation body respectively. The encapsulation body covers the electrode assembly, and the tabs extend from the top seal. The side seals are bent relative to the encapsulation body along the length direction of the cell. The crease after bending divides the protruding portion of the side seal relative to the encapsulation body along the length direction into a first side seal portion and a second side seal portion. One side of the first side seal portion is connected to the top seal, and the other side of the first side seal portion is connected to the second side seal portion. The crease causes the second side seal portion to fold towards the first side seal portion. Thus, in a battery having multiple such cells, the space occupied by two adjacent side seals in the thickness direction of two adjacent cells is reduced, and the clearance groove on the rigid plate can accommodate two adjacent side seals in two adjacent cells. The rigid plate no longer interferes with two adjacent side seals in two adjacent cells. At the same time, the side seals do not need to be cut, thus avoiding battery reliability failure caused by cracking of the side seals. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the planar structure of a battery cell from one perspective is shown;

[0022] Figure 2 A three-dimensional structural diagram of the battery cell is shown;

[0023] Figure 3 Show Figure 2 Enlarged view of section A;

[0024] Figure 4 A schematic diagram of the battery cell's planar structure from another perspective;

[0025] Figure 5 Showing the battery cell Figure 4 Enlarged view of section B;

[0026] Figure 6 A schematic diagram of the battery structure is shown;

[0027] Figure 7 A partial structural diagram of the battery is shown;

[0028] Figure 8 Show Figure 7 Enlarged view of section C.

[0029] Icons: 1-Cell; 11-Encapsulation film; 111-Side seal; 1111-Extension; 1112-First side seal; 1113-Second side seal; 1114-Fold; 112-Top seal; 113-Encapsulation body; 12-Taper; 2-Battery protection board; 21-Rigid board; 211-Allowing groove; 22-Flexible board; 23-Components; 24-Electrical connector; 25-Reinforcing plate; 3-Injection molded part; 41-Connecting tape; 42-Wrapping tape; 43-Tail tape; S-Reference plane; L1-Length direction; L2-Width direction; L3-Thickness direction. Detailed Implementation

[0030] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0031] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0032] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0033] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0034] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0035] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that 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 relation terms used herein will be interpreted accordingly.

[0036] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0037] Variations in the shapes shown in the accompanying 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 accompanying drawings, but include changes in shape that may occur during manufacturing.

[0038] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0039] The following will combine Figures 1 to 8 The present application describes the battery cell 1 and the battery. Figures 1 to 8 In the middle, the length direction L1, the width direction L2, and the thickness direction L3 of the battery cell 1 are perpendicular to each other.

[0040] According to one aspect of this application, a battery cell 1 is provided, such as... Figures 1 to 5 As shown, the battery cell 1 includes an encapsulation film 11, an electrode assembly, and electrode tabs 12. The encapsulation film 11 includes a connected encapsulation body 113, a top sealing edge 112, and two side sealing edges 111. The top sealing edge 112 extends from the top of the encapsulation body 113, and the two side sealing edges 111 extend from both sides of the encapsulation body 113. The encapsulation body 113 covers the electrode assembly, and a portion of the electrode tabs 12 extends from the top sealing edge 112. The side sealing edges 111 are bent relative to the encapsulation body 113 along the length direction L1 of the battery cell 1. After bending... The crease 1114 divides the side seal 111 into a first side seal 1112 and a second side seal 1113. One side of the first side seal 1112 is connected to the top seal 112, and the other side of the first side seal 1112 is connected to the second side seal 1113. The crease 1114 causes the second side seal 1113 to fold towards the first side seal 1112, resulting in a partial overlap between the space occupied by the first side seal 1112 in the thickness direction L3 and the space occupied by the second side seal 1113 in the thickness direction L3. Thus, in a battery having multiple cells 1 as described above, such as... Figure 8 As shown, the space occupied by the two adjacent side seals 111 in the thickness direction L3 of two adjacent cells 1 is reduced. This allows the clearance groove 211 on the rigid plate 21 to accommodate the two adjacent side seals 111 in the two adjacent cells 1, and the rigid plate 21 no longer interferes with the two adjacent side seals 111 in the two adjacent cells 1. At the same time, the side seals 111 do not need to be cut, avoiding battery reliability failure caused by cracking of the side seals 111.

[0041] Furthermore, when the protruding portion of the side sealing edge 111 of the battery cell 1 relative to the encapsulation body 113 is not bent, the clearance groove 211 on the rigid plate 21 cannot accommodate two adjacent unbent side sealing edges 111 of two adjacent battery cells 1. The two unbent side sealing edges 111 will interfere with the rigid plate 21. Although moving the rigid plate 21 above the side sealing edges 111 can avoid interference between the rigid plate 21 and the two unbent side sealing edges 111, the rigid plate 21 needs to occupy additional space in the length direction L1 of the battery cell 1. Within a limited space, the space that the battery cell 1 can occupy is reduced, thereby affecting the energy density of the battery cell 1. In a battery having the battery cell 1 of this application, such as Figure 8 As shown, the clearance groove 211 on the rigid plate 21 can accommodate the two side seals 111 of two adjacent cells 1. The space occupied by the rigid plate 21 in the length direction L1 overlaps with the space occupied by the side seals 111 in the length direction L1. Within a limited space, the space that the cell 1 can occupy increases, thereby improving the capacity density of the battery.

[0042] In the embodiments of this application, such as Figure 3As shown, the top sealing edge 112 also includes an extension 1111, which is located on one side of the encapsulation body 113 in the width direction L2 and is connected to the first side sealing portion 1112. The top sealing edge 112 is bent toward the encapsulation body 113, which allows the top sealing edge 112 and the first side sealing portion 1112 to enclose a receiving space. The portion of the top sealing edge 112 that protrudes relative to the encapsulation body 113 in the length direction L1 can be bent toward the side where the encapsulation body 113 is located, or it can be bent toward the side opposite to the encapsulation body 113. Preferably, the portion of the top sealing edge 112 that protrudes relative to the encapsulation body 113 in the length direction L1 can be bent toward the side where the encapsulation body 113 is located, so that the second side sealing portion 1113 is located within the receiving space enclosed by the top sealing edge 112 and the first side sealing portion 1112, which can prevent the second side sealing portion 1113 from occupying additional space.

[0043] like Figure 4 and Figure 5 As shown, the dimension H of the second side seal 1113 in the length direction L1 of the cell 1 is greater than or equal to 1 mm. This makes the dimension of the second side seal 1113 in the length direction L1 large enough to ensure that the clearance groove 211 of the rigid plate 21 after the second side seal 1113 is bent can accommodate the two adjacent side seal edges 111.

[0044] Optionally, the dimension H of the second side seal 1113 in the length direction L1 can be 1mm, 1.01mm, 1.02mm, etc.

[0045] like Figure 5 As shown, the encapsulation body 113 includes two reference planes S that are opposite to each other in the thickness direction L3. The two reference planes S are parallel. The angle α between the crease 1114 and the reference plane S is greater than or equal to 5 degrees and less than or equal to 85 degrees. This makes the size of the second side seal 1113 in the thickness direction L3 large enough to ensure that the clearance groove 211 of the rigid plate 21 after the second side seal 1113 is bent can accommodate the two adjacent side seal edges 111.

[0046] Optionally, the angle α between the crease 1114 and the reference plane S can be 5 degrees, 10 degrees, 15 degrees, 25 degrees, 45 degrees, 50 degrees, 60 degrees, 70 degrees or 85 degrees, etc.

[0047] Furthermore, the plane of the first side seal 1112 facing away from the second side seal 1113 is the first plane, and the surface of the second side seal 1113 facing away from the first side seal 1112 is the second plane. The angle between the first plane and the second plane in the side seal edge 111 is greater than or equal to 0 degrees and less than or equal to 30 degrees. This ensures that the second side seal 1113 will not protrude relative to the first side seal 1112 in the thickness direction L3, so that the part of the side seal edge 111 protruding relative to the encapsulation body 113 in the length direction L1 has a sufficiently small size in the thickness direction L3, thereby ensuring that the clearance groove 211 of the rigid board 21 can accommodate two adjacent side seal edges 111.

[0048] When the angle between the first plane and the second plane is 0 degrees, the first plane and the second plane are parallel. At this time, the first side seal 1112 and the second side seal 1113 are in contact. When the angle between the first plane and the second plane is greater than 0 and less than or equal to 30 degrees, there is a certain gap between the first side seal 1112 and the second side seal 1113.

[0049] Optionally, the included angle between the first plane and the second plane in a side seal 111 can be 0 degrees, 5 degrees, 7 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees or 30 degrees, etc.

[0050] Preferably, the angle between the first plane and the second plane in a side seal 111 is 10 degrees.

[0051] According to another aspect of this application, a battery is provided, such as... Figure 6 , Figure 7 and Figure 8 As shown, the battery includes a battery protection board 2 and at least two of the aforementioned battery cells 1. The at least two battery cells 1 are arranged along the width direction L2 of the battery cell 1, and adjacent battery cells 1 can be bonded together using adhesive tape 41. The battery protection board 2 has a clearance groove 211, and two adjacent side seals 111 of two adjacent battery cells 1 are located within the clearance groove 211. Thus, the space occupied by the rigid board 21 in the length direction L1 overlaps with the space occupied by the side seals 111 in the length direction L1, increasing the space that the battery cells 1 can occupy within a limited space, thereby improving the battery's capacity density.

[0052] Optionally, the wall of the clearance groove 211 may abut against the middle of the crease 1114 on the two adjacent side seals 111 of the two adjacent cells 1.

[0053] In addition, the number of battery cells 1 can be selected according to needs. For example, the number of battery cells 1 can be two, three or more. The number of clearance slots 211 can be selected based on the number of battery cells 1 in the battery. For example, when the number of battery cells 1 is two, the number of clearance slots 211 is one, and when the number of battery cells 1 is three, the number of clearance slots 211 is two.

[0054] like Figure 7 As shown, the battery protection board 2 includes a rigid board 21 and multiple components 23. The rigid board 21 has a clearance groove 211. The rigid board 21 includes a first fabric surface and a second fabric surface that are opposite to each other in the length direction L1. The multiple components 23 are disposed on the first fabric surface or the second fabric surface. Compared to fabricating components on both sides of the rigid board 21, disposing of multiple components 23 on the same side of the rigid board 21 in the length direction L1 can reduce the space occupied by the components 23 in the length direction L1.

[0055] Optionally, two adjacent side seals 111 of two adjacent cells 1 can be covered by the same insulating tape, which can achieve insulation and protection for the two adjacent side seals 111 of the two adjacent cells 1. A reinforcing plate 25 can be provided on the rigid plate 21, and the reinforcing plate 25 is arranged around the relief groove 211 to increase the structural strength of the rigid plate 21 at the location of the relief groove 211.

[0056] like Figure 7 As shown, the battery protection board 2 includes an electrical connector 24, which is connected to the rigid plate 21 on one side of the cell 1 in the thickness direction L3. The cell 1 includes tabs 12, and each tab 12 is correspondingly provided with an electrical connector 24. The tab 12 is connected to the corresponding electrical connector 24, thereby realizing the connection between the cell 1 and the battery protection board 2. Compared with setting the electrical connector 24 on the first or second fabric surface, setting the electrical connector 24 on one side of the rigid plate 21 in the thickness direction L3 of the cell 1 reduces the space occupied by the electrical connector 24 in the length direction L1, thereby improving the energy density of the battery.

[0057] Optionally, the electrical connector 24 is a nickel sheet, and the number of electrical connectors 24 can be selected according to the number of battery cells 1. For example, when there are two battery cells 1, the number of electrical connectors 24 is four, and when there are three battery cells 1, the number of electrical connectors 24 is six.

[0058] In addition, the battery protection board 2 also includes a flexible board 22, which is welded to the rigid board 21.

[0059] like Figure 6 As shown, the battery also includes an injection molded part 3 and a surrounding adhesive tape 42. Each cell 1 is connected to the injection molded part 3, and the rigid board 21 and multiple components 23 are all encased in the injection molded part 3. Part of the flexible board 22 extends out of the injection molded part 3. The battery also includes a surrounding adhesive tape 42, which surrounds the injection molded part 3. The injection molded part 3 can protect the battery protection board 2. The surrounding adhesive tape 42 covers the injection molded part 3, which can further improve the structural strength of the injection molded part 3, thereby improving the structural strength of the battery.

[0060] Optionally, the battery also includes a tail tape 43 that wraps around the tail of the plurality of cells 1.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cell, characterized in that, The battery cell includes an electrode assembly, electrode tabs, and an encapsulation film. The electrode tabs are connected to the electrode assembly. The encapsulation film includes an encapsulation body, a top sealing edge, and two side sealing edges connected to each other. The top sealing edge extends from the top of the encapsulation body, and the two side sealing edges extend from both sides of the encapsulation body. The encapsulation body covers the electrode assembly, and a portion of the electrode tabs extends from the top sealing edge. The side seal is bent relative to the encapsulation body along the length of the cell. The crease after bending divides the portion of the side seal relative to the encapsulation body along the length into a first side seal and a second side seal. One side of the first side seal is connected to the top seal, and the other side of the first side seal is connected to the second side seal. The crease causes the second side seal to fold towards the first side seal.

2. The battery cell according to claim 1, characterized in that, The first side seal and the top seal form an accommodating space, and the second side seal is located within the accommodating space.

3. The battery cell according to claim 1, characterized in that, The second side seal has a dimension greater than or equal to 1 mm in the length direction of the battery cell.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The encapsulation body includes two reference planes that are opposite to each other in the thickness direction of the battery cell. The angle between the crease and the reference plane is greater than or equal to 5 degrees and less than or equal to 85 degrees.

5. The battery cell according to any one of claims 1 to 3, characterized in that, The plane of the first side seal facing away from the second side seal is a first plane, and the surface of the second side seal facing away from the first side seal is a second plane. The angle between the first plane and the second plane in one of the side seal edges is greater than or equal to 0 degrees and less than or equal to 30 degrees.

6. The battery cell according to claim 5, characterized in that, The angle between the first plane and the second plane in one of the side seals is 10 degrees.

7. A battery, characterized in that, The battery includes a battery protection board and at least two cells as described in any one of claims 1-6, wherein the at least two cells are arranged along the width direction of the cells; The battery protection board has a clearance groove, and the two adjacent side seals of two adjacent battery cells are located in the clearance groove.

8. The battery according to claim 7, characterized in that, The battery protection board includes a rigid board and multiple components. The rigid board has the clearance groove. The rigid board includes a first fabric surface and a second fabric surface that are opposite to each other in the length direction. The multiple components are disposed on the first fabric surface or the second fabric surface.

9. The battery according to claim 8, characterized in that, The battery protection board includes an electrical connector, which is connected to the rigid plate on one side of the cell in the thickness direction. The battery cell includes tabs, and each tab is provided with a corresponding electrical connector. The tabs are electrically connected to the corresponding electrical connectors.

10. The battery according to claim 8 or 9, characterized in that, The battery also includes an injection molded part and a surrounding adhesive film, each of the battery cells is connected to the injection molded part, and the rigid board and multiple of the components are all encased in the injection molded part; The battery also includes a surrounding adhesive tape that surrounds the injection molded part.

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