Circuit board assembly and battery

Abstract

The utility model relates to the technical field of lithium batteries, in particular to a circuit board assembly and a battery. The circuit board assembly comprises a first flexible board; the first flexible board has a thickness direction and a length direction which are vertical to each other, and the first flexible board is provided with two conductive grooves which are recessed along the thickness direction; the two conductive grooves are arranged at intervals along the length direction; a positive tab and a negative tab of a battery cell can be respectively welded with the two conductive grooves in a tin melting manner, so that the positive tab and the negative tab are electrically connected with the first soft plate. According to the circuit board assembly and the battery provided by the invention, the problems of complex process and relatively high cost in the existing welding scheme of the battery protection board and the battery cell tab are solved.

Description

Technical Field

[0001] The present application relates to the technical field of lithium batteries, and in particular to a circuit board assembly and a battery. Background Art

[0002] The battery protection circuit module (PCM) is an important component that protects the battery from overcharge, over discharge, short circuit, etc. The battery protection board includes a flexible printed circuit (FPC) and a printed circuit board (PCB).

[0003] In conventional battery PACK solutions, the battery protection board is welded to the tabs of the battery cell through a U-shaped nickel sheet. Specifically, the nickel sheet is first mounted on the battery protection board, and then the nickel sheet and the tab are spot welded and then bent into a U shape.

[0004] However, in the above solution, the process is complicated and the cost is high. Utility Model Content

[0005] The purpose of the present application is to provide a circuit board assembly and a battery, thereby solving the problems of complex process and high cost in the existing welding solution of the battery protection board and the battery cell tab.

[0006] According to the first aspect of the present application, a circuit board assembly is provided, which includes a first soft board; the first soft board has a thickness direction and a length direction perpendicular to each other, and the first soft board is provided with two conductive grooves recessed along the thickness direction; the two conductive grooves are arranged at intervals along the length direction; the positive electrode ear and the negative electrode ear of the battery cell can be respectively tin-welded to the two conductive grooves, so that the positive electrode ear and the negative electrode ear are electrically connected to the first soft board.

[0007] In any of the above technical solutions, further, the circuit board assembly also includes a second soft board electrically connected to the first soft board; the first soft board and the second soft board are arranged opposite to each other, and the back side of the first soft board is insulated and connected to the back side of the second soft board.

[0008] In any of the above technical solutions, further, the circuit board assembly also includes a first support member; the back side of the first flexible board and the back side of the second flexible board are both insulated and connected to the first support member.

[0009] In any of the above technical solutions, further, the circuit board assembly also includes a second support member; the back side of the first soft board is plastic-sealed and connected to the first support member; the back side of the second soft board is plastic-sealed and connected to the second support member; the first support member is fixedly connected to the second support member.

[0010] In any of the above technical solutions, further, the circuit board assembly also includes a first plastic sealing member and a second plastic sealing member; the first plastic sealing member is arranged on a side of the first support member facing the second support member, and the second plastic sealing member is arranged on a side of the second support member facing the first support member; the first plastic sealing member and the second plastic sealing member are both provided with windows penetrating through themselves along the thickness direction, and the windows of the first plastic sealing member are arranged correspondingly to the windows of the second plastic sealing member; the first support member and the second support member are welded by tin melting through the windows.

[0011] In any of the above technical solutions, further, the circuit board assembly also includes a bending portion connecting the first soft board and the second soft board; the first soft board and the second soft board can be bent through the bending portion so that the back side of the first soft board is insulated and connected to the back side of the second soft board.

[0012] In any of the above technical solutions, further, the first soft board has a width direction which is respectively perpendicular to the thickness direction and the length direction; the two ends of the bending portion are respectively connected to one side of the first soft board in the width direction and one side of the second soft board in the width direction; the number of the bending portions is one or more, and when the number of the bending portions is multiple, the multiple bending portions are spaced apart along the length direction; the first soft board, the second soft board and the bending portion are integrally connected.

[0013] In any of the above technical solutions, further, the first support member and the second support member are both steel sheets.

[0014] In any of the above technical solutions, further, the first soft board has a width direction which is respectively perpendicular to the thickness direction and the length direction; the first soft board includes a first soft board body, a first extension portion and a second extension portion which are connected in sequence; the first support member is arranged on the first soft board body; the first extension portion is bent from the end of the first soft board body to the front side of the second soft board and extends along the length direction, and the second extension portion extends along the width direction; the second extension portion is provided with a connector.

[0015] According to a second aspect of the present application, a battery is provided, comprising the circuit board assembly as described above; the battery further comprises a battery cell, a positive electrode tab and a negative electrode tab of the battery cell are respectively tin-welded to the two conductive grooves.

[0016] According to the circuit board assembly of the present application, the circuit board assembly includes a first soft board; the first soft board has a thickness direction and a length direction perpendicular to each other, and the first soft board is provided with two conductive grooves (blind holes) recessed along the thickness direction, and the two conductive grooves are spaced apart along the length direction; the positive electrode ear and the negative electrode ear of the battery cell can be respectively tin-welded to the two conductive grooves so that the positive electrode ear and the negative electrode ear are electrically connected to the first soft board.

[0017] According to the above technical features, the beneficial effects of this application are:

[0018] The first flexible board of the present application is connected to the pole ear by melting tin, replacing the connection method of nickel sheet in the prior art. During assembly, the positive pole ear (negative pole ear) is electrically connected to the positive electrode network (negative electrode network) on the first flexible board through solder paste to achieve a complete path.

[0019] In summary, the pole ear of the present application can be directly welded to the conductive slot by melting tin, eliminating the nickel sheet in the prior art, which not only simplifies the process but also reduces the cost.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 A schematic diagram showing the structure of a folded circuit board assembly according to an embodiment of the present application;

[0023] Figure 2 Show Figure 1 A structural diagram from another perspective;

[0024] Figure 3 A schematic diagram showing the structure of two soft boards in an unfolded state according to an embodiment of the present application;

[0025] Figure 4 A schematic structural diagram showing a circuit board assembly in an unfolded state according to an embodiment of the present application;

[0026] Figure 5 A schematic diagram showing the structure of two soft boards after folding according to an embodiment of the present application;

[0027] Figure 6A schematic diagram of an exploded structure of a circuit board assembly according to an embodiment of the present application is shown;

[0028] Figure 7 A schematic structural diagram is shown after a circuit board assembly according to an embodiment of the present application is assembled on a battery cell.

[0029] Icons: 100-first flexible board; 101-conductive groove; 102-first extension part; 103-second extension part; 104-connector; 200-second flexible board; 201-bending part; 202-strip hole; 300-first supporting member; 400-second supporting member; 500-first plastic sealing member; 600-second plastic sealing member; 601-window; 700-first solder paste member; 800-second solder paste member; 900-battery cell; 901-ear; X-length direction; Y-width direction; Z-thickness direction. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

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

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] The features of the examples described herein may 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.

[0039] The first aspect of the present application provides a circuit board assembly, thereby solving the problems of complex process and high cost in the existing welding solution between the battery protection board and the battery cell tab.

[0040] Refer to the following Figures 1 to 7 The circuit board assembly according to some embodiments of the present application is described in detail.

[0041] The circuit board assembly of the present application, such as Figure 1 As shown, the circuit board assembly includes a first flexible board 100. The first flexible board 100 has a thickness direction Z and a length direction X perpendicular to each other, and the first flexible board 100 is provided with two conductive slots 101 (blind holes) recessed along the thickness direction Z, and the two conductive slots 101 are arranged at intervals along the length direction X; the positive and negative tabs of the battery cell can be tin-welded to the two conductive slots 101 respectively, so that the positive and negative tabs are electrically connected to the first flexible board 100.

[0042] According to the above technical features, the beneficial effects of this application are:

[0043] The first flexible board 100 of the present application is connected to the pole ear by melting tin, replacing the connection method of the nickel sheet in the prior art. During specific assembly, the positive pole ear (negative pole ear) is electrically connected to the positive electrode network (negative electrode network) on the first flexible board 100 through solder paste to achieve a complete path. For example, the conductive slot 101 on the first flexible board 100 is electrically connected to the positive electrode network in advance. During assembly, the positive pole ear is then welded to the conductive slot 101 through solder paste; or, the positive pole ear is directly welded to the positive electrode network on the first flexible board 100 through solder paste. Compared with the connection method of the nickel sheet in the prior art, the pole ear of the present application can be directly welded to the conductive slot by melting tin, eliminating the nickel sheet in the prior art, which not only simplifies the process but also reduces the cost.

[0044] Furthermore, in order to enable the circuit board assembly to be applied to a high-power battery, in an embodiment of the present application, Figure 1 As shown, the circuit board assembly further includes a second flexible board 200 electrically connected to the first flexible board 100. The first flexible board 100 and the second flexible board 200 are arranged opposite to each other, and the back surface of the first flexible board 100 is insulated and connected to the back surface of the second flexible board 200.

[0045] Furthermore, in order to support the two soft boards and ensure the stability of the two soft boards when assembled, the first soft board 100 and the second soft board 200 can be supported by a first support member 300; specifically, the back side of the first soft board 100 and the back side of the second soft board 200 are both insulated and connected to the first support member 300.

[0046] Furthermore, to facilitate assembly, the circuit board assembly also includes a second support member 400; the back side of the first soft board 100 is plastic-sealed and connected to the first support member 300, and the back side of the second soft board 200 is plastic-sealed and connected to the second support member 400; the first support member 300 is fixedly connected to the second support member 400.

[0047] In this embodiment, the first support member 300 and the second support member 400 can both be steel sheets. In this way, the steel sheets can better support the first soft board 100 and the second soft board 200 to prevent the first soft board 100 and the second soft board 200 from being deformed by force.

[0048] In this embodiment, the first support member 300 and the second support member 400 are fixed in the following manner.

[0049] The circuit board assembly further includes a first plastic sealing member 500 and a second plastic sealing member 600. When the first soft board 100 and the second soft board 200 are in a folded state, the first plastic sealing member 500 is arranged on a side of the first support member 300 facing the second support member 400, and the second plastic sealing member 600 is arranged on a side of the second support member 400 facing the first support member 300 (i.e., when the first soft board 100 and the second soft board 200 are in an unfolded state, as shown in FIG. Figure 4 and Figure 6 As shown, the first plastic sealing member 500 is disposed on the back side of the first supporting member 300 , and the second plastic sealing member 600 is disposed on the back side of the second supporting member 400 ).

[0050] Furthermore, if Figure 4 As shown, the first plastic sealing member 500 and the second plastic sealing member 600 are both provided with a window 601 penetrating through themselves along the thickness direction Z. The window 601 of the first plastic sealing member 500 is arranged corresponding to the window 601 of the second plastic sealing member 600. The first support member 300 and the second support member 400 are welded by tin melting through the window 601.

[0051] In addition, in the embodiments of the present application, Figures 1 to 4 As shown, the circuit board assembly also includes a bending portion 201 connecting the first soft board 100 and the second soft board 200; the first soft board 100 and the second soft board 200 can be bent by the bending portion 201 so that the first support member 300 and the second support member 400 are tin-welded.

[0052] As an example, Figure 1 , Figure 3 and Figure 4As shown, the first soft board 100 has a width direction Y and a length direction X respectively perpendicular to the thickness direction Z; two ends of the bending portion 201 respectively connect one side of the first soft board 100 in the width direction Y and one side of the second soft board 200 in the width direction Y. The number of the bending portions 201 is one or more. When the number of the bending portions 201 is more than one, the plurality of bending portions 201 are spaced apart along the length direction X.

[0053] In the embodiment of the present application, the first soft board 100, the second soft board 200 and the bending portion 201 are connected as one body. That is to say, when manufacturing the first soft board 100 and the second soft board 200, a large-area board layer (including the first soft board 100, the second soft board 200 and the bending portion 201) can be firstly manufactured by integral molding, and then on this basis, a plurality of strip holes 202 are opened in the middle of the integrally molded board layer, and a plurality of bending portions 201 are formed between the plurality of strip holes 202, thereby dividing the first soft board 100 and the second soft board 200.

[0054] In the embodiments of the present application, Figure 4 and Figure 5 As shown, the first soft board 100 includes a first soft board 100 body, a first extension portion 102 and a second extension portion 103 connected in sequence; wherein the first support member 300 is arranged on the first soft board 100 body, and the length of the first soft board 100 body is equal to that of the second soft board 200.

[0055] When the circuit board assembly is assembled on the battery cell 900 , the first extension portion 102 is bent from the end of the first flexible board 100 body to the front of the second flexible board 200 and extends along the length direction X. The second extension portion 103 extends along the width direction Y and is provided with a connector 104 .

[0056] According to a second aspect of the present application, a battery is provided, comprising the circuit board assembly as described above.

[0057] Furthermore, if Figure 7 As shown, the battery further includes a battery cell 900 , and the positive electrode tab and the negative electrode tab of the battery cell 900 are respectively tin-welded to two conductive slots 101 .

[0058] The specific assembly process is as follows:

[0059] The first support member 300 and the second support member 400 are respectively injection-molded on the first flexible board 100 and the second flexible board 200 to achieve insulation.

[0060] The first plastic package 500 and the second plastic package 600 are injection molded on the first support member 300 and the second support member 400 respectively.

[0061] The molten tin point is on the opening 601 of the first plastic package 500 and the second plastic package 600 (ie Figure 6 The second solder paste part 800 in FIG.

[0062] The first soft board 100 and the second soft board 200 are bent so that the first support member 300 and the second support member 400 are tin-welded.

[0063] The molten tin point is on the conductive groove 101 of the first soft board 100, so that the molten tin is welded with the tab 901 (i.e. Figure 6 The first solder paste part 700 in FIG.

[0064] In summary, the first flexible board of the present application is connected to the pole ear 901 by melting tin, replacing the connection method of the nickel sheet in the prior art. During specific assembly, the positive pole ear (negative pole ear) is electrically connected to the positive electrode network (negative electrode network) on the first flexible board through solder paste to achieve a complete path. Compared with the connection method of the nickel sheet in the prior art, the pole ear 901 of the present application can be directly welded to the conductive slot 101 by melting tin, eliminating the nickel sheet in the prior art, which not only simplifies the process but also reduces the cost.

[0065] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. A circuit board assembly, characterized in that: The circuit board assembly includes a first soft board; The first soft board has a thickness direction and a length direction perpendicular to each other, and the first soft board is provided with two conductive grooves recessed along the thickness direction; The two conductive slots are spaced apart along the length direction; The positive electrode tab and the negative electrode tab of the battery cell can be respectively tin-welded to the two conductive slots, so that the positive electrode tab and the negative electrode tab are electrically connected to the first flexible board.

2. The circuit board assembly according to claim 1, characterized in that: The circuit board assembly also includes a second flexible board electrically connected to the first flexible board; The first flexible board and the second flexible board are arranged opposite to each other, and the back surface of the first flexible board is insulated and connected to the back surface of the second flexible board.

3. The circuit board assembly according to claim 2, characterized in that: The circuit board assembly also includes a first support member; The back surface of the first flexible board and the back surface of the second flexible board are both insulated and connected to the first supporting member.

4. The circuit board assembly according to claim 3, characterized in that: The circuit board assembly also includes a second support member; The back side of the first flexible board is connected to the first supporting member by plastic sealing; The back side of the second flexible board is connected to the second supporting member by plastic sealing; The first supporting member is fixedly connected to the second supporting member.

5. The circuit board assembly according to claim 4, characterized in that: The circuit board assembly also includes a first plastic package and a second plastic package; The first plastic sealing member is arranged on a side of the first supporting member facing the second supporting member, and the second plastic sealing member is arranged on a side of the second supporting member facing the first supporting member; The first plastic sealing member and the second plastic sealing member are both provided with windows penetrating the first plastic sealing member along the thickness direction, and the windows of the first plastic sealing member are provided correspondingly to the windows of the second plastic sealing member; The first support member and the second support member are welded by tin melting through the opening.

6. The circuit board assembly according to claim 2, characterized in that: The circuit board assembly further includes a bending portion connecting the first soft board and the second soft board; The first soft board and the second soft board can be bent by the bending portion, so that the back surface of the first soft board is insulated and connected to the back surface of the second soft board.

7. The circuit board assembly according to claim 6, characterized in that: The first soft board has a width direction perpendicular to the thickness direction and the length direction respectively; Two ends of the bending portion are respectively connected to one side of the first soft board in the width direction and one side of the second soft board in the width direction; The number of the bending portions is one or more. When the number of the bending portions is multiple, the multiple bending portions are arranged at intervals along the length direction; The first soft board, the second soft board and the bending portion are integrally connected.

8. The circuit board assembly according to claim 4, characterized in that: The first supporting member and the second supporting member are both steel sheets.

9. The circuit board assembly according to claim 3, characterized in that: The first soft board has a width direction perpendicular to the thickness direction and the length direction respectively; The first soft board includes a first soft board body, a first extension part and a second extension part connected in sequence; The first supporting member is arranged on the first soft board body; The first extension portion is bent from the end of the first soft board body to the front of the second soft board and extends along the length direction, and the second extension portion extends along the width direction; The second extension portion is provided with a connector.

10. A battery, characterized in that: A circuit board assembly as claimed in any one of claims 1 to 9; The battery also includes a battery cell, and a positive electrode ear and a negative electrode ear of the battery cell are respectively tin-welded to the two conductive grooves.

Images