Flexible folding series battery pack and electric device

Abstract

The utility model discloses a flexible folding series battery pack and an electric device, and relates to the technical field of flexible batteries, the flexible folding series battery pack comprises a flexible substrate and at least two single batteries linearly arranged on the flexible substrate; a folding line is arranged between at least one group of two adjacent single batteries; at least one single battery is provided with at least one target tab penetrating through the front and back surfaces of the flexible substrate; the target tab is used for being electrically connected with the tab with the opposite polarity in another single battery after the flexible substrate is folded along the corresponding folding line, and / or the target tab is used for being connected with an external battery contact end. According to the technical scheme, the tabs with different polarities in the two single batteries can be contacted by simply folding the flexible substrate, so that the series connection between the single batteries is realized in a low-cost and easy-to-operate manner; and the series connection mode can be removed at any time according to requirements, so that the single batteries can be used as common single flexible batteries again.

Description

Technical Field

[0001] The utility model relates to the technical field of flexible batteries, and particularly relates to a flexible folding series battery pack and an electrical appliance device. Background Art

[0002] With the development of the Internet of Things and flexible electronics industries, flexible batteries have received increasing attention due to their simple production process and flexible application scenarios. Compared with traditional power batteries, flexible batteries are lighter and have better flexibility, with more electrode design space.

[0003] The battery parameters of a single flexible battery, such as the open-circuit voltage, are relatively small. In practical applications, multiple flexible batteries are often connected in series through modes such as series connection to obtain a higher open-circuit voltage. However, if multiple flexible batteries are connected in series in multiple steps using the manufacturing method of traditional battery packs, the manufacturing process of the flexible battery pack will be more cumbersome, with higher process requirements and costs. And if the manufacturing method of a stacked battery pack is used to connect multiple flexible batteries in series, each flexible battery cannot be used alone, thus greatly limiting the application scope. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a flexible folding series battery pack, aiming to connect multiple flexible batteries in series in a simple, easy-to-operate, and low-cost manner, without affecting the individual use of each flexible battery.

[0005] To achieve the above object, the flexible folding series battery pack proposed by the utility model includes:

[0006] A flexible substrate;

[0007] At least two single batteries, linearly arranged on the flexible substrate; at least one folding line is provided between at least two adjacent single batteries; at least one of the single batteries has at least one target tab, and the target tab penetrates the front and back surfaces of the flexible substrate; the target tab is used to electrically connect with a tab of opposite polarity in another single battery after the flexible substrate is folded along the corresponding folding line, and / or the target tab is used to connect an external battery contact end.

[0008] In an embodiment, the folding line divides the flexible substrate into a first base part and a second base part; taking one group of two adjacent single batteries as the first battery and the second battery respectively, the first battery is located on the first base part, and the second battery is located on the second base part;

[0009] Using two tabs with opposite polarities in the first battery and the second battery as the target tabs, when the flexible substrate is folded along the folding line, the two target tabs come into contact to achieve series connection of the first battery and the second battery.

[0010] In one embodiment, another tab of the first battery other than the target tab crosses the folding line and extends to the second base portion.

[0011] In one embodiment, another tab of the second battery other than the target tab crosses the folding line and extends to the first base portion.

[0012] In one embodiment, a first tab extension layer is provided on the back surface of the flexible substrate, and the first tab extension layer is connected to the target tab of the first battery; when the flexible substrate is folded along the folding line, the first tab extension layer contacts the target tab of the second battery.

[0013] In one embodiment, a second tab extension layer is provided on the back surface of the flexible substrate, and the second tab extension layer is connected to the target tab of the second battery; when the flexible substrate is folded along the folding line, the second tab extension layer contacts the target tab of the first battery.

[0014] In one embodiment, a first communication window is formed in the first base portion, and the first communication window penetrates the front and back surfaces of the flexible substrate; another tab of the second battery other than the target tab extends to a second area, and the second area overlaps with the first communication window along the axisymmetric direction with respect to the folding line.

[0015] In one embodiment, a second communication window is formed in the second base portion, and the second communication window penetrates the front and back surfaces of the flexible substrate; another tab of the first battery other than the target tab extends to a first area, and the first area overlaps with the second communication window along the axisymmetric direction with respect to the folding line.

[0016] In one embodiment, the folding line divides the flexible substrate into a first base portion and a second base portion; taking one group of two adjacent single cells as the first battery and the second battery respectively, the first battery is located in the first base portion, and the second battery is located in the second base portion;

[0017] Taking any one of the tabs of the second battery as the target tab, an avoidance window is provided in the first base portion, and the avoidance window is symmetrically arranged with respect to the folding line relative to the target tab; taking the tab of the first battery having the same polarity as the target tab as the first tab, and taking the tab of the second battery having the opposite polarity to the target tab as the second tab, the first tab is electrically connected to the second tab.

[0018] In one embodiment, the first tab and the second tab are connected through a conductive bridge layer on the flexible substrate.

[0019] In one embodiment, a first cutting line is provided around the first tab, and a second cutting line is provided around the second tab; when the flexible substrate is folded along the folding line, the first tab is used to connect to the second tab.

[0020] In one embodiment, a connection window is provided in the first base portion, the connection window is adjacent to the first tab, and a third cutting line is provided around the second tab; when the flexible substrate is folded along the folding line, the second tab is used to pass through the connection window and connect to the first tab.

[0021] In one embodiment, the number of the single cells is at least four, a folding line is provided between each adjacent two of the single cells, and the folding directions corresponding to two adjacent folding lines are opposite; a plurality of fourth avoidance windows are spaced apart on the flexible substrate;

[0022] When the flexible substrate is folded along a plurality of the folding lines, the positions of a plurality of the fourth avoidance windows are opposite to each other to form an avoidance channel, a part of the target tabs are in contact to achieve series connection, and the other part of the target tabs located at one end of the flexible substrate are used to pass through the avoidance channel and reach the other end of the flexible substrate.

[0023] In one embodiment, a sawtooth structure is provided on the surface of at least one tab of the single cell.

[0024] In one embodiment, the folding line is set as an easy-to-tear line.

[0025] In one embodiment, an adhesive layer is provided on the surface of the flexible substrate.

[0026] The present invention also provides an electrical device, including the flexible folding series battery pack as described above.

[0027] The technical solution of the present utility model sets the target tab of the single battery to penetrate the front and back sides of the flexible substrate. In this way, by simply folding the flexible substrate, the tabs with different polarities in two single batteries can be brought into contact, thereby realizing the series connection between single batteries in a low-cost and easy-to-operate manner. Moreover, this series connection form can be released at any time as needed to reuse the single batteries as ordinary single flexible batteries, thus overcoming the problems existing in the series connection method of laminated battery packs, such as the irreversibility of the series connection operation and the inability to use each single flexible battery separately after series connection, and broadening the application scope of this flexible folding series battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0029] Figure 1 Schematic diagram of the front side structure of the flexible substrate of the first embodiment of the flexible folding series battery pack provided by the present utility model;

[0030] Figure 2 Schematic diagram of the back side structure of the flexible substrate of the first embodiment of the flexible folding series battery pack provided by the present utility model;

[0031] Figure 3 Schematic diagram of the folded structure of the flexible substrate of the first embodiment of the flexible folding series battery pack provided by the present utility model;

[0032] Figure 4 Schematic diagram of the front side structure of the flexible substrate of the second embodiment of the flexible folding series battery pack provided by the present utility model;

[0033] Figure 5 Schematic diagram of the front side structure of the flexible substrate of the third embodiment of the flexible folding series battery pack provided by the present utility model;

[0034] Figure 6 Schematic diagram of the back side structure of the flexible substrate of the third embodiment of the flexible folding series battery pack provided by the present utility model;

[0035] Figure 7 Schematic diagram of the front side structure of the flexible substrate of the fourth embodiment of the flexible folding series battery pack provided by the present utility model;

[0036] Figure 8 Schematic diagram of the front side structure of the flexible substrate of the fifth embodiment of the flexible folding series battery pack provided by the present utility model;

[0037] Figure 9 Schematic diagram of the front structure of the flexible substrate of the sixth embodiment of the flexible folding series battery pack provided by the present utility model;

[0038] Figure 10 Schematic diagram of the front structure of the flexible substrate of the seventh embodiment of the flexible folding series battery pack provided by the present utility model;

[0039] Figure 11 Schematic diagram of the front structure of the flexible substrate of the eighth embodiment of the flexible folding series battery pack provided by the present utility model;

[0040] Figure 12 Schematic diagram of the back structure of the flexible substrate of the eighth embodiment of the flexible folding series battery pack provided by the present utility model;

[0041] Figure 13 Schematic diagram of the back structure of the flexible substrate of the ninth embodiment of the flexible folding series battery pack provided by the present utility model.

[0042] Explanation of the reference numerals in the drawings:

[0043] 1. Flexible substrate; 101. First base part; 102. Second base part; 103. Folding line;

[0044] 2. Single cell; 201. First battery; 202. Second battery;

[0045] 3. Target tab; 4. First tab extension layer; 5. Second tab extension layer; 6. First communication window; 7. Avoidance window; 8. First tab; 9. Second tab; 10. Conductive bridge layer; 11. First cutting line; 12. Second cutting line; 13. Connection window; 14. Third cutting line; 15. Fourth avoidance window; 16. Adhesive layer.

[0046] The realization, functional features and advantages of the purpose of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0047] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0048] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture. If this specific posture changes, then the directional indications will also change accordingly.

[0049] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or inability to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0050] The battery parameters of a single flexible battery, such as the open-circuit voltage, are relatively small. In actual applications, multiple flexible batteries are often connected in series through modes such as series connection to obtain a higher open-circuit voltage. However, if the traditional manufacturing method of a battery pack is used to connect multiple flexible batteries in series in multiple times, it will lead to a more cumbersome manufacturing process of the flexible battery pack, higher process requirements and costs. And if the manufacturing method of a laminated battery pack is used to connect multiple flexible batteries in series, it will cause each flexible battery among them to be unable to be used alone, thus greatly limiting the application scope.

[0051] To solve the above problems, the present utility model proposes a flexible folding series-connected battery pack, which can realize the series connection of two single flexible batteries through a simple folding operation, and the two single flexible batteries can still be used alone after the subsequent series connection is released.

[0052] Please refer to Figures 1 to 3 , in the first embodiment of the present utility model, the flexible folding series-connected battery pack includes a flexible substrate 1 and at least two single batteries 2; at least two single batteries 2 are linearly arranged on the flexible substrate 1; there is a folding line 103 between at least one group of adjacent two single batteries 2; at least one single battery 2 has at least one target tab 3, and the target tab 3 penetrates the front and back of the flexible substrate 1; the target tab 3 is used to realize electrical connection with the tab of the opposite polarity in another single battery 2 after the flexible substrate 1 is folded along the corresponding folding line 103, and / or the target tab 3 is used to connect an external battery contact end.

[0053] In this embodiment, each single cell 2 is a flexible battery that can be used independently and has basic battery functions such as energy storage and energy supply. The tabs of the single cell 2 include a positive tab and a negative tab, and both the positive tab and the negative tab can serve as the target tab 3.

[0054] For ease of understanding, Figures 1 to 3 As an example, the two single cells 2 shown in FIG. Figure 1 Shown is the front side of the flexible substrate 1, Figure 2 The reverse side of the flexible substrate 1 is shown; it can be understood that, in order to facilitate the intuitive correspondence between the positions of the tabs on the front and back sides of the flexible substrate 1, Figure 2 The corresponding features in are set directly with Figure 1 The specific implementation of this embodiment is described as follows:

[0055] In the initial state, the flexible substrate 1 is laid flat, with a folding line 103 located in the middle of the flexible substrate 1. The two cells 2 are located on the left and right sides of the folding line 103, respectively. The positive tab of the left cell 2 and the negative tab of the right cell 2 are both located on the front side of the flexible substrate 1. The negative tab of the left cell 2 and the positive tab of the right cell 2 can serve as target tabs 3 and pass through the front and back sides of the flexible substrate 1. The negative tab of the left cell 2 and the positive tab of the right cell 2 are arranged symmetrically with respect to the folding line 103. When the flexible substrate 1 is folded along the folding line 103, as shown in FIG. Figure 3 As shown, the left side and the right side of the back surface of the flexible substrate 1 are attached to each other. At this time, the negative tab of the left single battery 2 located on the back surface of the flexible substrate 1 can contact the positive tab of the right single battery 2 located on the back surface of the flexible substrate 1. In this way, the electrical connection between the two tabs of opposite polarity in the two single batteries 2 is completed, thereby realizing the series connection between the two single batteries 2.

[0056] It is understood that, in addition to the above embodiment, only the negative tab of the left-side cell 2 can be used as the target tab 3 and penetrated through the front and back surfaces of the flexible substrate 1, while the positive tab of the right-side cell 2 is located on the front surface of the flexible substrate 1. The positive tab of the right-side cell 2 can be extended to the back surface of the flexible substrate 1 by cutting, providing a connecting channel, or providing an adapter. In this way, when the flexible substrate 1 is folded along the folding line 103, the portion of the negative tab of the left-side cell 2 located on the back surface of the flexible substrate 1 can still directly or indirectly contact the positive tab of the right-side cell 2, thereby achieving a series connection. Similarly, only the positive tab of the right-side cell 2 can be used as the target tab 3 and penetrated through the front and back surfaces of the flexible substrate 1, while the negative tab of the left-side cell 2 is located on the front surface of the flexible substrate 1. In this way, after the flexible substrate 1 is folded, the two cells 2 can be connected in series.

[0057] The above concept can be applied between any two adjacent single cells 2 on the flexible substrate 1 to complete the connection between the tabs with opposite polarities in the two single cells 2 through a folding operation, thereby conveniently realizing the series connection between the two single cells 2; regarding the specific distribution form of the single cells 2, the arrangement form of the electrode positions, etc., they can be flexibly set according to the actual application situation on the basis of the above concept, which will not be elaborated here. When at least two single cells 2 are connected in series by the above method, a complete flexible folding series battery pack can be formed.

[0058] It should be noted that for the target tab 3 that penetrates the front and back sides of the flexible substrate 1, in addition to being used to realize the series connection between the two single cells 2, it can also be set not to contact another tab after the flexible substrate 1 is folded, but to serve as the external electrode of the entire flexible folding series battery pack; when this external electrode is electrically connected to the external battery contact end of the electrical device, the flexible folding series battery pack can supply power to the electrical device.

[0059] It can be seen that in this embodiment, the target tab 3 of the single cell 2 is set to penetrate the front and back sides of the flexible substrate 1, so that by simply folding the flexible substrate 1, the tabs with different polarities in the two single cells 2 can be brought into contact, thereby realizing the series connection between the single cells 2 in a low-cost and easy-to-operate manner; moreover, this series connection form can be released at any time as needed to use the single cells 2 therein as ordinary single flexible batteries again, thereby overcoming the problems existing in the series connection method of the laminated battery pack, such as the irreversibility of the series connection operation and the inability of each single flexible battery after series connection to be used alone again, and broadening the application scope of the flexible folding series battery pack.

[0060] Optionally, referring to Figures 1 to 3 , the folding line 103 divides the flexible substrate 1 into a first base portion 101 and a second base portion 102; taking one group of two adjacent single cells 2 as the first cell 201 and the second cell 202 respectively, the first cell 201 is located in the first base portion 101, and the second cell 202 is located in the second base portion 102;

[0061] Taking the two tabs with opposite polarities in the first cell 201 and the second cell 202 as the target tabs 3, when the flexible substrate 1 is folded along the folding line 103, the two target tabs 3 come into contact to realize the series connection between the first cell 201 and the second cell 202.

[0062] Still taking the Figures 1 to 3 two single cells 2 shown as an example ( Figure 1 shown is the front side of the flexible substrate 1, Figure 2The reverse side of the flexible substrate 1 is shown; it can be understood that, in order to facilitate the intuitive correspondence between the positions of the tabs on the front and back sides of the flexible substrate 1, Figure 2 The corresponding features in are set directly with Figure 1 The specific implementation of this embodiment is described as follows:

[0063] In the initial state, the flexible substrate 1 is laid flat, with a folding line 103 located in the middle of the flexible substrate 1. The left side of the folding line 103 is the first base portion 101, and the right side of the folding line 103 is the second base portion 102. The positive tab of the first battery 201 and the negative tab of the second battery 202 are both located on the front side of the flexible substrate 1. The negative tab of the first battery 201 and the positive tab of the second battery 202 serve as target tabs 3 and pass through the front and back sides of the flexible substrate 1. The negative tab of the first battery 201 and the positive tab of the second battery 202 are arranged symmetrically with respect to the folding line 103. When the flexible substrate 1 is folded along the folding line 103, as shown in FIG. Figure 3 As shown, the reverse side of the first base portion 101 is in contact with the reverse side of the second base portion 102. At this time, the portion of the negative electrode ear of the first battery 201 located on the reverse side of the first base portion 101 can contact the portion of the positive electrode ear of the second battery 202 located on the reverse side of the second base portion 102. In this way, the electrical connection between the two electrodes of opposite polarity in the first battery 201 and the second battery 202 is completed, thereby realizing the series connection of the first battery 201 and the second battery 202.

[0064] Based on the above arrangement, a simple folding operation of the flexible substrate 1 can realize the series connection between the two single cells 2, and the series connection can be released by unfolding the flexible substrate 1. The operation is simple and quick, without the need for other adapter structures or additional operations, and the application is highly convenient.

[0065] Optionally, refer to Figure 4 , another tab other than the target tab 3 in the second battery 202 crosses the folding line 103 and extends to the first base portion 101 .

[0066] by Figure 4 As shown in the figure, for example, the negative tab of the second battery 202 extends to the left across the folding line 103 and to the first base portion 101. Thus, when the flexible substrate 1 is folded along the folding line 103, a portion of the negative tab of the second battery 202 (i.e., the portion of the negative tab located on the first base portion 101) can be ensured to be on the same plane as the positive tab of the first battery 201. This makes it easier to connect the positive tab of the first battery 201 and the negative tab of the second battery 202 as external electrodes of the flexible foldable series battery pack to the external battery contact terminal of the electrical device.

[0067] Similarly, the positive electrode tab of the first battery 201 can also cross the folding line 103 to the right and extend to the second base portion 102; in this way, after the flexible substrate 1 is folded along the folding line 103, it is ensured that a part of the positive electrode tab of the first battery 201 (i.e., the part of the positive electrode tab located in the second base portion 102) is in the same plane as the negative electrode tab of the second battery 202.

[0068] Optionally, referring to Figure 5 and Figure 6 , a first tab extension layer 4 is provided on the reverse side of the flexible substrate 1, and the first tab extension layer 4 is connected to the target tab 3 of the first battery 201; after the flexible substrate 1 is folded along the folding line 103, the first tab extension layer 4 contacts the target tab 3 of the second battery 202.

[0069] Optionally, referring to Figure 5 and Figure 6 , a second tab extension layer 5 is provided on the reverse side of the flexible substrate 1, and the second tab extension layer 5 is connected to the target tab 3 of the second battery 202; after the flexible substrate 1 is folded along the folding line 103, the second tab extension layer 5 contacts the target tab 3 of the first battery 201.

[0070] In this embodiment, both the first tab extension layer 4 and the second tab extension layer 5 can adopt any solid or liquid conductive medium, such as a conductive sheet, an electrolyte, etc.; wherein, when a liquid electrolyte is used, an insulating rubber frame can be used to enclose and form an accommodation area for the electrolyte to prevent the electrolyte from overflowing. The first tab extension layer 4 is used to expand the coverage range of the target tab 3 of the first battery 201, and the second tab extension layer 5 is used to expand the coverage range of the target tab 3 of the second battery 202; in the case where the two target tabs 3 that need to be in contact after folding in the first battery 201 and the second battery 202 are not symmetrically arranged with respect to the folding line 103, any target tab 3 can still be indirectly connected to the other target tab 3 through contact with the first tab extension layer 4 and the second tab extension layer 5.

[0071] Based on the above settings, the restrictions on the arrangement positions of the tabs in the single battery 2 can be lifted to a certain extent, which is convenient for the design of the battery pack. Taking Figure 5 and Figure 6Taking the shown as an example, the negative terminal tab of the first battery 201 and the positive terminal tab of the second battery 202 both penetrate the front and back sides of the flexible substrate 1 as the target terminal tabs 3; the lower end of the first terminal tab extension layer 4 is connected to the negative terminal tab of the first battery 201 on the back side of the flexible substrate 1, and the upper end of the first terminal tab extension layer 4 extends upward; the upper end of the second terminal tab extension layer 5 is connected to the positive terminal tab of the second battery 202 on the back side of the flexible substrate 1, and the lower end of the second terminal tab extension layer 5 extends downward; the arrangement positions of the terminal tabs in the first battery 201 are exactly the same as the arrangement positions of the terminal tabs in the second battery 202. At this time, the flexible folded series battery pack constitutes a same-pole and same-direction design. In this design method, the positive terminal tabs and the negative terminal tabs can be printed simultaneously, thereby simplifying the production process; when the flexible substrate 1 is folded along the folding line 103, the negative terminal tab of the first battery 201 can contact the second terminal tab extension layer 5, and the positive terminal tab of the second battery 202 can also contact the first terminal tab extension layer 4. In this way, the connection between the negative terminal tab of the first battery 201 and the positive terminal tab of the second battery 202 is realized through an indirect connection method.

[0072] Optionally, referring to Figure 7 , a first communication window 6 is provided in the first base portion 101, and the first communication window 6 penetrates the front and back sides of the flexible substrate 1; the other terminal tab in the second battery 202 except the target terminal tab 3 extends to the second area, and the second area is symmetrically arranged with respect to the folding line 103 with the first communication window 6.

[0073] Optionally, referring to Figure 7 , a second communication window (not shown in the figure) is provided in the second base portion 102, and the second communication window penetrates the front and back sides of the flexible substrate 1; the other terminal tab in the first battery 201 except the target terminal tab 3 extends to the first area, and the first area is symmetrically arranged with respect to the folding line 103 with the second communication window.

[0074] Specifically, the other ear of the first battery 201 and the second battery 202 except for the target ear 3 needs to be used as the external electrode of the flexible folded series battery pack. When the positive and negative electrodes of the external electrode are on the same plane, it is more convenient to connect the flexible folded series battery pack to the external battery contact end of the electrical device through the external electrode. Based on the solution of this embodiment, by opening the first communication window 6 in the first base 101, a channel can be provided for the ear of the second battery 202 that needs to be used as the external electrode. After the flexible substrate 1 is folded along the folding line 103, the ear of the second battery 202 that needs to be used as the external electrode can pass through the first communication window 6 to be coplanar with the ear of the first battery 201 that needs to be used as the external electrode; similarly, by opening the second communication window in the second base 102, a channel can be provided for the ear of the first battery 201 that needs to be used as the external electrode. After the flexible substrate 1 is folded along the folding line 103, the ear of the first battery 201 that needs to be used as the external electrode can pass through the second communication window to be coplanar with the ear of the second battery 202 that needs to be used as the external electrode.

[0075] Taking Figure 7 as an example, the positive ear of the first battery 201 and the negative ear of the second battery 202 are used as the external electrodes of the flexible folded series battery pack. The positive ear of the first battery 201 is arranged on the front of the first base 101 and is located at the upper right side of the first battery 201. The first communication window 6 is opened below the positive ear of the first battery 201. The negative ear of the second battery 202 is located at the upper left side of the second battery 202 and extends downward to the second area. The second area is symmetrically arranged with respect to the folding line 103 with the first communication window 6; after the flexible substrate 1 is folded along the folding line 103, the part of the negative ear of the second battery 202 located in the second area is opposite to the first communication window 6. At this time, the part of the negative ear of the second battery 202 located in the second area can pass through the first communication window 6 to reach the front of the first base 101, so that the negative ear of the second battery 202 and the positive ear of the first battery 201 can be in the same plane, which is more convenient to connect the negative ear of the second battery 202 and the positive ear of the first battery 201 as the external electrodes of the flexible folded series battery pack to the external battery contact end of the electrical device.

[0076] It should be noted that in Figure 7In the specific embodiments shown, if the negative electrode tab of the second battery 202 is arranged to penetrate through the front and back sides of the flexible substrate 1, when the flexible substrate 1 is folded along the folding line 103, the part of the negative electrode tab of the second battery 202 located on the back side of the flexible substrate 1 can directly pass through the first communication window 6, so that the negative electrode tab of the second battery 202 and the positive electrode tab of the first battery 201 are located on the same plane; if the negative electrode tab of the second battery 202 is only arranged on the front side of the flexible substrate 1, it is necessary to additionally cut the periphery of the negative electrode tab of the second battery 202 so that the extended part of the negative electrode tab of the second battery 202 can be folded over, so that when the flexible substrate 1 is folded along the folding line 103, the extended part of the negative electrode tab of the second battery 202 can be folded over to pass through the first communication window 6, so that the negative electrode tab of the second battery 202 and the positive electrode tab of the first battery 201 are located on the same plane. The above two methods can be flexibly selected according to needs during actual application, and are not limited here.

[0077] Optionally, referring to Figures 8 to 10 , the folding line 103 divides the flexible substrate 1 into a first base part 101 and a second base part 102; taking two adjacent single cells 2 as the first battery 201 and the second battery 202 respectively, the first battery 201 is located on the first base part 101, and the second battery 202 is located on the second base part 102;

[0078] Taking any electrode tab of the second battery 202 as the target electrode tab 3, an avoidance window 7 is opened on the first base part 101, and the avoidance window 7 is symmetrically arranged with respect to the folding line 103 with the target electrode tab 3; taking the electrode tab of the first battery 201 with the same polarity as the target electrode tab 3 as the first electrode tab 8, and taking the electrode tab of the second battery 202 with the opposite polarity to the target electrode tab 3 as the second electrode tab 9, the first electrode tab 8 is connected to the second electrode tab 9.

[0079] In this embodiment, the target electrode tab 3 is used as the external electrode of the flexible folding battery, and the electrode tab of the first battery 201 with the opposite polarity to the target electrode tab 3 is also used as the external electrode of the flexible folding battery. By providing the avoidance window 7, when the flexible substrate 1 is folded along the folding line 103, the part of the target electrode tab 3 located on the back side of the flexible substrate 1 can directly pass through the avoidance window 7, so that the target electrode tab 3 and the electrode tab of the first battery 201 used as the external electrode can be coplanar, thus making it more convenient to use the two electrode tabs with opposite polarities as the external electrodes of the flexible folding series battery pack and connect them to the external battery contact end of the electrical device. Figures 8 to 10Taking the example shown, the positive tab of the second battery 202 serves as the target tab 3, and the positive tab of the second battery 202 and the negative tab of the first battery 201 need to be connected to the external battery contact terminal as external electrodes. The avoidance window 7 and the positive tab of the second battery 202 are arranged symmetrically with respect to the folding line 103; when the flexible substrate 1 is folded along the folding line 103, the portion of the positive tab of the second battery 202 located on the back side of the flexible substrate 1 will directly pass through the avoidance window 7, thereby achieving the coplanarity of the positive tab of the second battery 202 and the negative tab of the first battery 201.

[0080] Furthermore, by connecting the first tab 8 and the second tab 9 of opposite polarity, the first battery 201 and the second battery 202 can be connected in series. The first battery 201 and the second battery 202 can be connected by adding an adapter, cutting, opening a window, etc. For details, please refer to the following embodiments:

[0081] Reference Figure 8 In the first embodiment, the first electrode tab 8 and the second electrode tab 9 are connected via a conductive bridge layer 10 on the flexible substrate 1. Specifically, the positive electrode tab of the first battery 201 serves as the first electrode tab 8, and the negative electrode tab of the second battery 202 serves as the second electrode tab 9. The left end of the conductive bridge layer 10 is connected to the first electrode tab 8, and the right end of the conductive bridge layer 10 is connected to the second electrode tab 9. In this way, the first electrode tab 8 and the second electrode tab 9 are connected via the conductive bridge layer 10, thereby achieving the series connection of the first battery 201 and the second battery 202. The conductive bridge layer 10 can be made of any solid or liquid conductive medium, such as a conductive sheet, an electrolyte, etc., and is not limited here.

[0082] Reference Figure 9 In the second embodiment, a first cutting line 11 is provided around the first electrode tab 8 , and a second cutting line 12 is provided around the second electrode tab 9 ; when the flexible substrate 1 is folded along the folding line 103 , the first electrode tab 8 is used to connect with the second electrode tab 9 .

[0083] By setting the first cutting line 11, cutting can be performed along the periphery of the first pole tab 8, so that the cut first pole tab 8 can be folded relative to the flexible substrate 1; specifically, when the first pole tab 8 is set on the front side of the flexible substrate 1, by folding the first pole tab 8, at least a portion of the first pole tab 8 can be flipped to the back side of the flexible substrate 1. Similarly, by setting the second cutting line 12, cutting can be performed along the periphery of the second pole tab 9, so that the cut second pole tab 9 can be folded relative to the flexible substrate 1; specifically, when the second pole tab 9 is set on the front side of the flexible substrate 1, by folding the second pole tab 9, at least a portion of the second pole tab 9 can be flipped to the back side of the flexible substrate 1. Based on this setting, Figure 9As shown, the positive electrode tab of the first battery 201 is used as the first tab 8, and the negative electrode tab of the second battery 202 is used as the second tab 9; when the flexible substrate 1 is folded along the folding line 103, the first tab 8 and the second tab 9 can be turned over so that they are in the same plane and connected.

[0084] Referring to Figure 10 , in the third embodiment, the first base portion 101 is provided with a connection window 13, the connection window 13 is adjacent to the first tab 8, and a third cutting line 14 is provided around the second tab 9; when the flexible substrate 1 is folded along the folding line 103, the second tab 9 is used to pass through the connection window 13 and connect with the first tab 8.

[0085] Specifically, the connection window 13 penetrates the front and back sides of the flexible substrate 1; by providing the third cutting line 14, the second tab 9 can be cut along its periphery, so that the cut second tab 9 can be turned over relative to the flexible substrate 1. As Figure 10 shown, the positive electrode tab of the first battery 201 is used as the first tab 8, and the negative electrode tab of the second battery 202 is used as the second tab 9; when the flexible substrate 1 is folded along the folding line 103, the second tab 9 can be turned over so that the second tab 9 passes through the connection window 13 and is connected to the first tab 8.

[0086] Optionally, referring to Figure 11 and Figure 12 , the number of single cells 2 is at least four, a folding line 103 is provided between each adjacent pair of single cells 2, and the folding directions corresponding to adjacent two folding lines 103 are opposite; a plurality of fourth avoidance windows 15 are spaced apart on the flexible substrate 1;

[0087] When the flexible substrate 1 is folded along a plurality of folding lines 103, the positions of the plurality of fourth avoidance windows 15 are opposite to each other to form an avoidance channel, a part of the target tabs 3 are in contact to achieve series connection, and another part of the target tabs 3 located at one end of the flexible substrate 1 are used to pass through the avoidance channel and reach the other end of the flexible substrate 1.

[0088] For ease of understanding, taking the four single cells 2 shown in Figure 11 and Figure 12 as an example ( Figure 11 shows the front side of the flexible substrate 1, Figure 12 shows the back side of the flexible substrate 1; it can be understood that, for ease of visually corresponding the positions of the tabs on the front and back sides of the flexible substrate 1, Figure 12 the corresponding features in Figure 11 are directly set at the same position as

[0089] The flexible substrate 1 is laid flat in the initial state. The positive electrode tab of the first monomer battery 2 from the left, the negative electrode tab of the second monomer battery 2 from the left, the positive electrode tab of the third monomer battery 2 from the left, and the positive and negative electrode tabs of the fourth monomer battery 2 from the left all penetrate through the front and back sides of the flexible substrate 1, and the remaining electrode tabs are arranged on the front side of the flexible substrate 1. There are three folding lines 103 provided on the flexible substrate 1. The folding directions corresponding to the folding lines 103 on both sides are opposite to the folding direction corresponding to the middle folding line 103. Fourth avoidance windows 15 are provided at the first monomer battery 2 from the left, the second monomer battery 2 from the left, and the third monomer battery 2 from the left. The fourth avoidance window 15 of the first monomer battery 2 from the left and the fourth avoidance window 15 of the second monomer battery 2 from the left are symmetrically arranged with respect to the left folding line 103. The fourth avoidance window 15 of the second monomer battery 2 from the left and the fourth avoidance window 15 of the third monomer battery 2 from the left are symmetrically arranged with respect to the middle folding line 103. The fourth avoidance window 15 of the third monomer battery 2 from the left and the positive electrode tab of the fourth monomer battery 2 from the left are symmetrically arranged with respect to the right folding line 103. Based on the above settings, when the flexible substrate 1 is folded along the three folding lines 103 in the corresponding folding directions respectively, the part of the positive electrode tab of the first monomer battery 2 from the left located on the back side of the flexible substrate 1 will contact the part of the negative electrode tab of the second monomer battery 2 from the left located on the back side of the flexible substrate 1. The part of the positive electrode tab of the second monomer battery 2 from the left located on the front side of the flexible substrate 1 will contact the part of the negative electrode tab of the third monomer battery 2 from the left located on the front side of the flexible substrate 1. The part of the positive electrode tab of the third monomer battery 2 from the left located on the back side of the flexible substrate 1 will contact the part of the negative electrode tab of the fourth monomer battery 2 from the left located on the back side of the flexible substrate 1. In this way, the series connection between the four monomer batteries 2 is realized. And the three fourth avoidance windows 15 on the flexible substrate 1 will overlap with each other after folding to form an avoidance channel. The part of the positive electrode tab of the fourth monomer battery 2 from the left located on the back side of the flexible substrate 1 can pass through this avoidance channel to be coplanar with the negative electrode tab of the first monomer battery 2 from the left, so as to more conveniently use the positive electrode tab of the fourth monomer battery 2 from the left and the negative electrode tab of the first monomer battery 2 from the left as the external electrodes of the flexible folding series battery pack to be connected to the external battery contact end of the electrical device.

[0090] For the case where the number of monomer batteries 2 is set to more than four, the same setting can be made with reference to the above embodiments. While realizing the series connection of multiple monomer batteries 2 through folding operations, the corresponding two electrode tabs in the two monomer batteries 2 located at both ends of the flexible substrate 1 can be made coplanar through the fourth avoidance windows 15, which will not be elaborated here.

[0091] Optionally, refer to Figures 1 to 12, at least one tab surface of the single cell 2 is provided with a serrated structure (not shown in the figure). When the two tabs come into contact with each other after the flexible substrate 1 is folded, the connection stability between the tabs can be increased through the engagement between the serrated structures on the tab surfaces, and the internal resistance can be reduced thereby, improving the operation stability of the flexible folded series battery pack.

[0092] Optionally, referring to Figures 1 to 12 , the folding line 103 is set as a tear line; in this way, when it is necessary to use any single cell 2 alone, the operator can easily tear the flexible substrate 1 along the folding line 103, so that the single cell 2 can be quickly separated from the flexible substrate 1 without the aid of other tools.

[0093] Optionally, referring to Figure 13 , an adhesive layer 16 is provided on the surface of the flexible substrate 1; wherein, the adhesive layer 16 can adopt an adhesive layer with adhesiveness or other adhesive materials, and the adhesive layer 16 can be set on the front side, back side or other positions of the flexible substrate 1 according to needs.

[0094] By providing the adhesive layer 16, on the one hand, the two parts of the flexible substrate 1 that are attached to each other after folding can be bonded together, making the connection between the corresponding tabs closer, and enabling the flexible folded series battery pack to stably maintain the folded state, thereby improving the structural and operation stability of the flexible folded series battery pack; on the other hand, the flexible substrate 1 can be bonded to other devices, thus realizing the connection and fixation between the flexible battery and external devices in a convenient and easy-to-operate manner, broadening its scope of use.

[0095] Please refer to Figures 1 to 13 , the present invention also proposes an electrical device, including the flexible folded series battery pack in any of the above embodiments.

[0096] In this embodiment, the electrical device includes devices that need to be driven by electric energy such as wearable devices and terminal devices. The flexible folded series battery pack can output the stored electric energy to the electrical device through the connection between the target tab 3 and the external battery contact end of the electrical device to realize the power supply operation for the electrical device. Regarding the specific structure of the flexible folded series battery pack, reference can be made to the above embodiments. Since the electrical device in this embodiment adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0097] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A flexible folding series battery pack, characterized in that, Comprising: A flexible substrate; At least two single cells, linearly arranged on the flexible substrate; At least one set of folding lines are provided between two adjacent ones of the single cells; At least one of the single cells has at least one target tab, and the target tab penetrates the front and back sides of the flexible substrate; the target tab is used for electrically connecting with a tab of opposite polarity in another single cell after the flexible substrate is folded along the corresponding folding line, and / or the target tab is used for connecting to an external battery contact end.

2. The flexible folding series battery pack according to claim 1, wherein, The folding line divides the flexible substrate into a first base part and a second base part; taking one set of two adjacent single cells as a first cell and a second cell respectively, the first cell is located on the first base part, and the second cell is located on the second base part; Taking two tabs of opposite polarity in the first cell and the second cell as the target tabs, when the flexible substrate is folded along the folding line, the two target tabs come into contact to connect the first cell and the second cell in series.

3. The flexible folding series battery pack according to claim 2, characterized in that, Another tab of the first cell other than the target tab crosses the folding line and extends to the second base part; Or, another tab of the second cell other than the target tab crosses the folding line and extends to the first base part.

4. The flexible folding series battery pack according to claim 2, wherein, A first tab extension layer is provided on the back side of the flexible substrate, and the first tab extension layer is connected to the target tab of the first cell; when the flexible substrate is folded along the folding line, the first tab extension layer contacts the target tab of the second cell; And / or, a second tab extension layer is provided on the back side of the flexible substrate, and the second tab extension layer is connected to the target tab of the second cell; When the flexible substrate is folded along the folding line, the second tab extension layer contacts the target tab of the first cell.

5. The flexible folding series battery pack according to claim 2, wherein, A first communication window is formed in the first base part, and the first communication window penetrates the front and back sides of the flexible substrate; another tab of the second cell other than the target tab extends to a second area, and the second area overlaps with the first communication window along the axisymmetric direction with respect to the folding line; Or, a second communication window is formed in the second base part, and the second communication window penetrates the front and back sides of the flexible substrate; another tab of the first cell other than the target tab extends to a first area, and the first area overlaps with the second communication window along the axisymmetric direction with respect to the folding line.

6. The flexible folding series battery pack according to claim 1, wherein The folding line divides the flexible substrate into a first base part and a second base part; taking one set of two adjacent single cells as a first cell and a second cell respectively, the first cell is located on the first base part, and the second cell is located on the second base part; Taking any tab of the second battery as the target tab, an avoidance window is provided in the first base portion, and the avoidance window is symmetrically arranged with respect to the folding line relative to the target tab; taking the tab of the first battery that has the same polarity as the target tab as the first tab, and taking the tab of the second battery that has the opposite polarity to the target tab as the second tab, the first tab and the second tab are electrically connected.

7. The flexible folding series battery pack according to claim 6, wherein The first tab and the second tab are connected through a conductive bridge layer on the flexible substrate; Alternatively, a first cutting line is provided around the first tab, and a second cutting line is provided around the second tab; when the flexible substrate is folded along the folding line, the first tab is used to connect with the second tab; Alternatively, a connection window is provided in the first base portion, the connection window is adjacent to the first tab, and a third cutting line is provided around the second tab; when the flexible substrate is folded along the folding line, the second tab is used to pass through the connection window and connect with the first tab.

8. The flexible folding series battery pack according to claim 1, wherein, The number of the single cells is at least four, a folding line is provided between each adjacent pair of the single cells, and the folding directions corresponding to two adjacent folding lines are opposite; a plurality of fourth avoidance windows are spaced apart on the flexible substrate; When the flexible substrate is folded along a plurality of the folding lines, positions of a plurality of the fourth avoidance windows are opposite to each other to form an avoidance channel, a part of the target tabs are in contact to achieve series connection, and another part of the target tabs located at one end of the flexible substrate are used to pass through the avoidance channel and reach the other end of the flexible substrate.

9. The flexible folding series battery pack according to any one of claims 1 to 8, characterized in that, A sawtooth structure is provided on the surface of at least one tab of the single cell; and / or, the folding line is set as an easy tear line; and / or, an adhesive layer is provided on the surface of the flexible substrate.

10. An electrical appliance, characterized in that, Comprising the flexible folding series battery pack according to any one of claims 1 to 9.

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