Battery

Abstract

The utility model provides a battery and relates to the technical field of batteries. The battery comprises a battery protection plate, a battery cell and an injection molding part, the battery protection plate comprises a printed circuit board, a plastic package part and a nickel sheet, the printed circuit board comprises a plate body and an electronic component, the plate body comprises a first surface and a second surface which are opposite to each other in the length direction of the battery cell, and the first surface faces the battery cell; the electronic component and the nickel sheet are both arranged on the first surface, and the plastic package part wraps the electronic component and is connected with the first surface; part of the battery protection plate is wrapped by the injection-molded part, the injection-molded part is connected with the head of the battery cell, and the end face, back to the battery cell, of the injection-molded part is not higher than the second surface in the length direction. In the battery, the injection molding part does not need to wrap the side where the second surface is located, the end face, back to the battery cell, of the injection molding part is not higher than the second surface in the length direction of the battery cell, and the size of the injection molding part in the length direction of the battery cell is reduced, so that the space occupied by the battery cell is increased, and 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. Background Art

[0002] With the advent of the 5G era, the demand for battery capacity is increasing. Batteries generally consist of a battery protection board (BPB) and a battery cell. The BPB consists of a printed circuit board (PCB) and a flexible printed circuit board (FPC). The PCB is equipped with electronic components. The BPB can be placed horizontally and fixed to the head of the battery cell through low-pressure injection molding.

[0003] In order to reduce the space occupied by the battery protection board along the length of the battery cell, the thickness of the printed circuit board is continuously reduced. In order to ensure the structural strength of the battery protection board, the SIP (System-in-Package) process can be used for plastic sealing reinforcement. In order to ensure that the nickel sheet can be welded to the tab, the electronic components need to be on the opposite side of the nickel sheet. However, when the battery protection board is fixed to the head of the battery cell by low-pressure injection molding, the injection molded part formed by low-pressure injection molding needs to ensure that the battery protection board is completely covered by the injection molded part. The injection molded part occupies a large space along the length of the battery cell, resulting in a smaller space occupied by the battery cell and a lower capacity density of the battery. Utility Model Content

[0004] In view of this, the present application provides a battery protection plate and a battery to solve the problem that the injection molded parts in the existing battery occupy a large space in the length direction of the battery cell, resulting in a smaller space occupied by the battery cell and a lower capacity density of the battery.

[0005] The present application provides a battery, comprising a battery protection board, a battery cell, and an injection molded part. The battery protection board comprises a printed circuit board, a plastic seal, and a nickel sheet. The printed circuit board comprises a board body and electronic components. The board body comprises a first surface and a second surface facing away from each other in the length direction of the battery cell. The first surface faces the battery cell. The electronic components and the nickel sheet are both arranged on the first surface. The plastic seal covers the electronic components and is connected to the first surface.

[0006] Part of the battery protection plate is covered by the injection molded part, and the injection molded part is connected to the head of the battery cell. In the length direction, the end surface of the injection molded part facing away from the battery cell is not higher than the second surface.

[0007] Preferably, the plate body further comprises a connecting surface, and the first surface and the second surface are connected via the connecting surface;

[0008] The plastic package and the nickel sheet are both covered inside the injection molded part, and at least a portion of the connection surface is covered inside the injection molded part.

[0009] Preferably, the battery protection board further includes a flexible circuit board, the flexible circuit board is connected to the printed circuit board, a portion of the flexible circuit board is adhered to the first surface, and a portion of the flexible circuit board is covered by the injection molded part.

[0010] Preferably, the battery protection board further includes a packaging portion, the packaging portion covers one end of the flexible circuit board connected to the printed circuit board, and the packaging portion is connected to the first surface, and the injection molded part covers the packaging portion.

[0011] Preferably, the battery protection plate further includes a reinforcement member, the reinforcement member is in contact with the second surface, and the reinforcement member is exposed outside the injection molded part.

[0012] Preferably, the dimension of the reinforcement in the length direction is less than or equal to 0.4 mm.

[0013] Preferably, the first surface includes a plurality of first mounting areas, and any of the first mounting areas is provided with the electronic components;

[0014] The battery protection board includes multiple plastic sealing parts, which correspond one-to-one to the multiple first installation areas respectively. The plastic sealing parts are connected to the corresponding first installation areas and cover the electronic components on the corresponding first installation areas. The multiple plastic sealing parts are all covered inside the injection-molded part.

[0015] Preferably, the first surface further includes a plurality of second mounting areas, the plurality of second mounting areas are alternately arranged with the plurality of first mounting areas, and the nickel sheet is arranged on the second mounting areas.

[0016] Preferably, the dimension of the plastic package in the length direction is 0.4 mm-1.5 mm.

[0017] Preferably, the dimension of the injection molded part in the length direction is less than or equal to 2.3 mm.

[0018] In the battery protection board, the plastic encapsulation covers the electronic components, achieving partial encapsulation of the electronic components, allowing the electronic components and the nickel sheet to be placed on the first surface. In this way, the injection molded part formed by low-pressure injection molding does not need to cover the side where the second surface is located. Along the length of the battery cell, the end surface of the injection molded part facing away from the battery cell is no higher than the second surface. The size of the injection molded part along the length of the battery cell is reduced, which increases the space occupied by the battery cell and improves the capacity density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic diagram showing the planar structure of a battery protection plate according to the first embodiment of the present invention;

[0021] Figure 2 An exploded view of a battery protection plate according to a first embodiment of the present invention is shown;

[0022] Figure 3 A cross-sectional view of a battery including the battery protection plate of the first embodiment is shown;

[0023] Figure 4 A cross-sectional view of a battery including the battery protection plate of the second embodiment is shown;

[0024] Figure 5 A cross-sectional view of a battery including the battery protection plate of the third embodiment is shown;

[0025] Figure 6 Shows an exploded view of a battery.

[0026] Icons: 1-battery protection board; 11-printed circuit board; 111-board body; 112-electronic components; 12-flexible circuit board; 13-nickel sheet; 14-plastic sealing part; 15-reinforcement member; 16-packaging part; 2-injection molding part; 21-first injection molding part; 22-second injection molding part; 3-battery cell; 41-first insulating tape; 42-second insulating tape; 43-double-sided tape; 44-first connecting tape; 45-second connecting tape;

[0027] S1 - first surface; S11 - first installation area; S12 - second installation area; S2 - second surface; L1 - length direction; L2 - width direction; L3 - thickness direction. DETAILED DESCRIPTION

[0028] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon 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. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0029] 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 possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0030] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” 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 coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0031] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0032] 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 used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0033] 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 encompass different orientations of the device in use or operation in addition to the orientations 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 would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," 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.

[0034] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0035] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0036] 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.

[0037] The following will be combined Figures 1 to 6 The battery of this application is described in Figures 1 to 6 In the figure, the length direction L1, width direction L2 and thickness direction L3 of the battery cell 3 intersect with each other, and the intersection can preferably be vertical. The following describes the battery protection board 1 and the battery by taking the length direction L1, width direction L2 and thickness direction L3 as an example of being perpendicular to each other.

[0038] The present application provides a battery, such as Figures 1 to 5As shown, the battery includes a battery protection board 1, a battery cell 3, and an injection molded part 2. The battery protection board 1 includes a printed circuit board 11, a plastic seal 14, and a nickel sheet 13. The printed circuit board 11 includes a board body 111 and electronic components 112. The board body 111 includes a first surface S1 and a second surface S2 opposite to each other in the longitudinal direction L1 of the battery cell 3. The first surface S1 faces the battery cell 3. The electronic components 112 and the nickel sheet 13 are both arranged on the first surface S1. The plastic seal 14 covers the electronic components 112 and is connected to the first surface S1. The battery protection board 1 is partially covered by the injection molded part 2, which is connected to the head of the battery cell 3. In the longitudinal direction L1, the end surface of the injection molded part 2 facing away from the battery cell 3 is no higher than the second surface S2. In the battery protection board 1, the plastic seal 14 covers the electronic components 112, achieving partial encapsulation of the electronic components 112, so that the electronic components 112 and the nickel sheet 13 can both be arranged on the first surface S1. In this way, the injection molded part 2 formed by low-pressure injection molding does not need to cover the side where the second surface S2 is located. In the length direction L1 of the battery cell 3, the end face of the injection molded part 2 facing away from the battery cell 3 is not higher than the second surface S2. The size of the injection molded part 2 in the length direction L1 of the battery cell 3 is reduced, so that the space that the battery cell 3 can occupy is increased, thereby improving the capacity density of the battery.

[0039] Furthermore, the board body 111 also includes a connecting surface, and the first surface S1 and the second surface S2 are connected by the connecting surface; the plastic package 14 and the nickel sheet 13 are both covered inside the injection molded part 2, and at least part of the connecting surface is covered inside the injection molded part 2, so that the end face of the injection molded part 2 facing away from the battery cell 3 is not higher than the second surface S2, thereby lowering the size of the injection molded part 2 in the length direction L1 of the battery cell 3.

[0040] Optionally, the connecting surface is a whole formed by the four side surfaces of the plate body 111. The connecting surface can be only partially covered inside the injection molded part 2, in which case the upper end surface of the injection molded part 2 is lower than the second surface S2. The connecting surface can also be completely covered inside the injection molded part 2, in which case the upper end surface of the injection molded part 2 is flush with the second surface S2.

[0041] In the embodiments of the present application, Figure 1 and Figure 2As shown, the first surface S1 includes multiple first mounting areas S11, and any first mounting area S11 is provided with electronic components 112, that is, the electronic components 112 can be divided into multiple groups, and the multiple groups of electronic components 112 are respectively provided on the multiple first mounting areas S11. The battery protection board 1 includes multiple plastic sealing parts 14, and the multiple plastic sealing parts 14 correspond one-to-one to the multiple first mounting areas S11. The plastic sealing parts 14 are connected to the corresponding first mounting areas S11 and cover the plastic sealing parts 14 provided on the corresponding first mounting areas S11. In this way, the multiple plastic sealing parts 14 respectively cover the multiple groups of injection-molded parts 2, which can protect the multiple groups of injection-molded parts 2 separately, thereby improving the overall strength of the battery protection board 1. Multiple groups of electronic components 112 are located on the first surface S1. When the battery protection board 1 is fixed to the head of the battery cell 3 through low-pressure injection molding, the first surface S1 faces the battery cell 3. The injection molded part 2 formed by low-pressure injection molding does not need to cover the side where the second surface S2 is located. The space occupied by the injection molded part 2 in the length direction L1 is reduced, allowing the battery cell 3 to occupy more space within the limited space, thereby improving the battery capacity density. Optionally, the first surface S1 can include two first mounting areas S11, which are spaced apart along the width direction L2 of the battery protection board 1.

[0042] Optionally, the plastic packaging member 14 may be a sheet-like structure formed by plastic packaging the electronic components 112 on the first mounting area S11 .

[0043] Furthermore, the first surface S1 also includes a second mounting area S12, and the battery protection plate 1 also includes a nickel sheet 13. The nickel sheet 13 can be welded to the second mounting area S12 so that the nickel sheet 13 is aligned with the second mounting area S12. The nickel sheet 13 is located on the first surface S1 facing the battery cell 3, which can facilitate welding of the tabs in the battery cell 3 to the nickel sheet 13. There can be two second mounting areas S12, and both second mounting areas S12 are provided with a nickel sheet 13, and the two nickel sheets 13 are respectively connected to the two tabs of the battery cell 3.

[0044] Optionally, the second installation area S12 and the first installation area S11 may be alternately arranged.

[0045] In addition, a soldering pad may be provided at one end of the first surface S1 in the width direction L2. The battery protection board 1 also includes a flexible circuit board 12, which is soldered to the soldering pad to achieve a connection between the printed circuit board 11 and the flexible circuit board 12. An encapsulation portion 16 may also be provided at the connection between the flexible circuit board 12 and the printed circuit board 11. The encapsulation portion 16 may be a block-shaped structure formed by curing UV glue. The provision of the encapsulation portion 16 can enhance the connection strength between the battery protection board 1 and the printed circuit board 11, and improve the stability of the electrical connection between the printed protection board and the flexible circuit board 12.

[0046] In the embodiment of the present application, the dimension a of the plastic encapsulation member 14 in the longitudinal direction L1 can be 0.4 mm to 1.5 mm, that is, the thickness of the injection molded part 2 is 0.4 mm to 1.5 mm. For example, the dimension a of the plastic encapsulation member 14 in the longitudinal direction L1 can be 0.4 mm, 0.5 mm, 0.6 mm, 1.0 mm, 1.2 mm, 1.4 mm, or 1.5 mm. Setting the dimension of the plastic encapsulation member 14 in the longitudinal direction L1 to the above dimensions ensures that the electronic components 112 can be fully covered while minimizing the space occupied by the plastic encapsulation member 14 in the longitudinal direction L1. This increases the space occupied by the battery cells 3, thereby improving the capacity density of the battery.

[0047] Preferably, the dimension a of the plastic package 14 in the length direction L1 is 0.6 mm.

[0048] Furthermore, the thickness b of the board body 111 is 0.1 mm to 0.3 mm, that is, the dimension of the board body 111 in the length direction L1 is 0.1 mm to 0.3 mm. For example, the thickness b of the board body 111 can be 0.1 mm, 0.15 mm, 0.2 mm, 0.23 mm, 0.25 mm, or 0.3 mm. Setting the thickness of the board body 111 to 0.1 mm to 0.3 mm minimizes the space occupied by the board body 111 while ensuring its structural strength, thereby increasing the space available for the battery cells 3.

[0049] Preferably, the dimension of the injection molded part 2 in the length direction L1 is less than or equal to 2.3 mm.

[0050] When the dimension of the plastic package 14 in the length direction L1 is 0.6mm and the thickness of the board body 111 is 0.1mm-0.3mm, the overall thickness of the battery protection board 1 is 0.7mm-0.9mm. Compared with the existing battery protection board 1 with an overall thickness of 1.8-2.2mm, the battery protection board 1 of the present application is thinner by 50%-60%. While ensuring the strength of the battery protection board 1 itself, the space occupied by the injection molded part 2 located at the head of the battery cell 3 is reduced, and the space occupied by the battery cell 3 is increased, thereby improving the capacity density of the battery.

[0051] Optionally, the battery protection plate 1 may be provided with a reinforcement 15 or may not be provided with a reinforcement 15. Figures 1 to 3 As shown, in the first embodiment, no reinforcement member 15 is provided on the second surface S2. Figure 4 and Figure 5 As shown, in the second and third embodiments, a reinforcement member 15 is provided on the second surface S2. The reinforcement member 15 can protect the side of the battery protection board 1 where the second surface S2 is located, thereby improving the structural strength of the battery protection board 1.

[0052] Alternatively, as Figure 4 As shown, in the second embodiment, the reinforcement member 15 may be a sheet-like structure formed by plastic-sealing the second surface S2; Figure 5 As shown, in the third embodiment, the reinforcement 15 may be a steel sheet, and the reinforcement 15 may be bonded to the second surface S2 by glue.

[0053] Preferably, the dimension of the reinforcement 15 in the length direction L1 is less than or equal to 0.4 mm.

[0054] In the battery protection board 1 of the present application, the provision of the plastic encapsulation member 14 allows all electronic components 112 to be disposed on the first surface S1. During low-pressure injection molding, only one side of the battery protection board 1 needs to be encapsulated. This reduces the space occupied by the injection molded member 2, allowing more space for the battery cells 3, thereby improving the battery's capacity density.

[0055] like Figure 3 、 Figure 4 and Figure 5 As shown, the injection molded part 2 may include a first injection molded portion 21 and a second injection molded portion 22. The first injection molded portion 21 covers the plastic seal 14 and is connected to the battery cell 3. This allows a portion of the first injection molded portion 21 to be located between the battery protection board 1 and the battery cell 3, while the other portion surrounds the side of the plastic seal 14, thereby completely covering the side of the first surface S1 of the printed circuit board 11. This allows the nickel sheet 13 and the plastic seal 14 to be enclosed within the injection molded part 2. Part of the board body 111 is covered by the second injection molded portion 22, thereby further improving the stability of the fixation between the battery protection board 1 and the battery cell 3.

[0056] Optionally, a portion of the connecting surface of the plate body 111 is covered by the second injection molding portion 22, in which case the second surface S2 of the plate body 111 and another portion of the connecting surface are exposed to the outside of the injection molded part 2. Alternatively, the connecting surface of the plate body 111 may be entirely covered by the second molding member 14, in which case only the second surface S2 of the plate body 111 is exposed to the outside of the injection molded part 2.

[0057] In the embodiments of the present application, Figure 6 As shown, the battery includes double-sided tape 43, which allows the battery protection plate 1 to be bonded to the head of the battery cell 3. A first insulating tape 41 is also provided on the battery protection plate 1 to insulate the battery protection plate 1. Both the double-sided tape 43 and the first insulating tape 41 are covered by the injection molded part 2. Furthermore, a second insulating tape 42 is provided at the rear of the battery cell 3 to insulate the rear of the battery cell 3.

[0058] In addition, the battery also includes a first connecting tape 44 and a second connecting tape 45. The first connecting tape 44 covers one side of the battery cell 3 in the thickness direction L3 and two side surfaces in the width direction L2. The second connecting tape 45 is arranged on one side of the first connecting tape 44 and is connected to the first connecting tape 44 to facilitate pulling the first connecting tape 44.

[0059] Optionally, the first connecting adhesive tape 44 and the second connecting adhesive tape 45 are both PET papers.

[0060] The assembly process of the battery of this application is as follows:

[0061] 1. Plastic-encapsulate the electronic components 112 on the printed circuit board 11 to form a battery protection board 1 including a plastic encapsulation member 14;

[0062] 2. Fold the top sealing edge of the battery cell 3;

[0063] 3. Weld the nickel sheet 13 to the tab, and bond the battery protection plate 1 to the head of the battery cell 3 using double-sided tape 43;

[0064] 4. Install the first insulating tape 41, and then perform low-pressure injection molding to fix the battery protection board 1, thereby forming the injection molded part 2;

[0065] 5. Install the second insulating tape 42, the first connecting tape 44 and the second connecting tape 45 to complete the assembly of the battery.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery, characterized in that: The battery includes a battery protection board, a battery cell, and an injection molded part. The battery protection board includes a printed circuit board, a plastic seal, and a nickel sheet. The printed circuit board includes a board body and electronic components. The board body includes a first surface and a second surface opposite to each other in the length direction of the battery cell. The first surface faces the battery cell. The electronic components and the nickel sheet are both arranged on the first surface. The plastic seal covers the electronic components and is connected to the first surface. Part of the battery protection plate is covered by the injection molded part, and the injection molded part is connected to the head of the battery cell. In the length direction, the end surface of the injection molded part facing away from the battery cell is not higher than the second surface.

2. The battery according to claim 1, characterized in that The plate body further includes a connecting surface, and the first surface and the second surface are connected by the connecting surface; The plastic package and the nickel sheet are both covered inside the injection molded part, and at least a portion of the connection surface is covered inside the injection molded part.

3. The battery according to claim 1, characterized in that The battery protection board also includes a flexible circuit board, which is connected to the printed circuit board. Part of the flexible circuit board is in contact with the first surface, and part of the flexible circuit board is covered by the injection molded part.

4. The battery according to claim 3, characterized in that The battery protection board further includes a packaging portion, which covers one end of the flexible circuit board connected to the printed circuit board, and the packaging portion is connected to the first surface, and the injection molded part covers the packaging portion.

5. The battery according to claim 1, characterized in that The battery protection plate further includes a reinforcement member, the reinforcement member is bonded to the second surface, and the reinforcement member is exposed outside the injection molded part.

6. The battery according to claim 5, characterized in that A dimension of the reinforcement in the length direction is less than or equal to 0.4 mm.

7. The battery according to claim 2, characterized in that The first surface includes a plurality of first mounting areas, and the electronic components are arranged in any of the first mounting areas; The battery protection board includes multiple plastic sealing parts, which correspond one-to-one to the multiple first installation areas respectively. The plastic sealing parts are connected to the corresponding first installation areas and cover the electronic components on the corresponding first installation areas. The multiple plastic sealing parts are all covered inside the injection-molded part.

8. The battery according to claim 7, characterized in that The first surface further includes a plurality of second mounting areas, which are arranged alternately with the plurality of first mounting areas, and the nickel sheets are arranged on the second mounting areas.

9. The battery according to any one of claims 1 to 8, characterized in that The dimension of the plastic package part in the length direction is 0.4 mm to 1.5 mm.

10. The battery according to claim 9, characterized in that The dimension of the injection molded part in the length direction is less than or equal to 2.3 mm.

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