Series-parallel battery cell

Abstract

The utility model belongs to the technical field of batteries, and mainly relates to a series-parallel battery cell which comprises a first lamination body, a second lamination body connected with the first lamination body in series, a third lamination body connected with the first lamination body in parallel and a shell, the first lamination body is connected in series with the second lamination body through the first connecting tab, and the first lamination body is connected in parallel with the third lamination body through the second connecting tab; the shell is provided with an assembling cavity for assembling the first lamination body, the second lamination body and the third lamination body; according to the improvement on the series-parallel battery cell, the problem of shaking caused by hot melt adhesive bonding in a traditional series-parallel battery cell is fundamentally solved, and the structural stability and the finished product quality of the battery cell are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field, concretely relates to a series and parallel electric core. BACKGROUND

[0002] With the wide application of electronic equipment, the electric core as its core energy source, the design level of its structure has important influence on the performance and reliability of electronic equipment. The existing electric core technology is mainly divided into parallel electric core and series electric core and the electric core structure combined with parallel and series connection, these structures have been widely applied in the market.

[0003] However, the series connection, parallel connection and series-parallel connection electric core in the prior art all adopt the external series-parallel connection mode to realize current or voltage regulation. However, this mode leads to complex external connection of the electric core, increases the cost of the electric core and the difficulty of system design. In addition, the existing series-parallel connection electric core mostly adopts the upper and lower stacking mode, wherein the electric cores are only separated by the aluminum plastic film and are bonded by means of the hot melt adhesive paper. However, the electric core structure stacked in the upper and lower modes is prone to shaking, especially during transportation or use, which may cause the displacement of the electric core. Due to the limitations of the shaking of the electric core and the bonding of the hot melt adhesive paper, the quality of the series-parallel connection electric core is easily affected, thereby affecting the product performance.

[0004] Therefore, it is urgent to improve the structure of the existing series-parallel connection electric core to solve the defects in the prior art. UTILITY MODEL CONTENTS

[0005] The utility model aims at: in view of the deficiency of prior art, and provide a kind of series and parallel electric core, solve the limitations of electric core shaking and hot melt adhesive paper bonding in the prior art in series electric core.

[0006] In order to realize the above technical purpose, the following technical scheme is implemented in the present application:

[0007] A series and parallel electric core, comprising a first laminated body, a second laminated body connected in series with the first laminated body, a third laminated body connected in parallel with the first laminated body, and a housing; the first laminated body is connected in series with the second laminated body through a first connecting tab, and the first laminated body is connected in parallel with the third laminated body through a second connecting tab; the housing is provided with an assembly cavity for assembling the first laminated body, the second laminated body and the third laminated body.

[0008] The above technical scheme produces the following technical effects:

[0009] The first stack body in the application is connected in series with the second stack body through the first connecting tab, and is connected in parallel with the second stack body through the second connecting tab, thereby effectively improving the performance of the battery cell.

[0010] As a further improvement of the application, the first stack body is provided with a first empty foil and a second empty foil.

[0011] The first empty foil is used to be connected with the first connecting tab, and the second empty foil is used to be connected with the second connecting tab.

[0012] As a further improvement of the application, the second stack body is provided with a third empty foil connected with the first empty foil through the first connecting tab.

[0013] As a further improvement of the application, the third stack body is provided with a fourth empty foil connected with the second empty foil through the second connecting tab.

[0014] As a further improvement of the application, the polarity of the third empty foil is opposite to that of the first empty foil.

[0015] When the third empty foil is a positive current collector, the first empty foil is a negative current collector.

[0016] When the third empty foil is a negative current collector, the first empty foil is a positive current collector.

[0017] As a further improvement of the application, the fourth empty foil includes a fourth positive empty foil and a fourth negative empty foil.

[0018] The second empty foil includes a second positive empty foil and a second negative empty foil.

[0019] The second connecting tab is provided with a second connecting positive tab and a second connecting negative tab.

[0020] The fourth positive empty foil is connected with the second positive empty foil through the second connecting positive tab, and the fourth negative empty foil is connected with the second negative empty foil through the second connecting negative tab.

[0021] As a further improvement of the application, it further includes an external connecting tab, which includes a first external connecting tab and a second external connecting tab, the second stack body is provided with a fifth empty foil, and the third stack body is provided with a sixth empty foil.

[0022] The fifth empty foil is connected with the first external connection tab, and the sixth empty foil is connected with the second external connection tab, and the external connection tab is used for outputting the electric energy of the series-parallel battery cell.

[0023] As a further improvement of the series-parallel battery cell, the fourth lamination body is further included.

[0024] The third lamination body and the fourth lamination body are connected in parallel through the second connection tab.

[0025] As a further improvement of the series-parallel battery cell, the first connection tab and the second connection tab are both provided with a tab rubber area, and the tab rubber area is provided with a tab rubber.

[0026] As a further improvement of the series-parallel battery cell, the shell is provided with a top sealing area, and the external connection tab is arranged in the top sealing area. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 It is a structural schematic view of the embodiment 1 in the present application;

[0029] Figure 2 It is a structural schematic view of the shell in the embodiment 1 in the present application;

[0030] Figure 3 It is a structural schematic view of the first lamination body, the second lamination body and the third lamination body in the embodiment 1 in the present application;

[0031] Figure 4 It is a structural schematic view of the first lamination body, the second lamination body, the third lamination body and the fourth lamination body in the embodiment 2 in the present application;

[0032] Figure 5 It is a structural schematic view of the shell of the four assembly cavities in the embodiment 2 in the present application;

[0033] Among them:

[0034] 1-the first lamination body;

[0035] 11-the first empty foil;

[0036] 12-the second empty foil;

[0037] 121-the second positive empty foil;

[0038] 122-the second negative empty foil;

[0039] 2 - second lamination body;

[0040] 21 - third empty foil;

[0041] 22 - fifth empty foil;

[0042] 23 - sixth empty foil;

[0043] 3 - third lamination body;

[0044] 31 - fourth empty foil;

[0045] 311 - fourth positive empty foil;

[0046] 312 - fourth negative empty foil;

[0047] 4 - housing;

[0048] 41 - assembly cavity;

[0049] 42 - top sealing area;

[0050] 43 - air bag;

[0051] 5 - first connecting tab;

[0052] 51 - tab rubber area;

[0053] 6 - second connecting tab;

[0054] 61 - second connecting positive tab;

[0055] 62 - second connecting negative tab;

[0056] 7 - external tab;

[0057] 71 - first external tab;

[0058] 72 - second external tab;

[0059] 8 - fourth lamination body. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without any creative work under the premise that the embodiments in the present application are within the scope of protection of the present application. Unless otherwise defined, all the technical and scientific terms used in the present application are the same as the meanings commonly understood by those skilled in the art in the technical field of the present application. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application.

[0061] In the description of the utility model, unless another explicit provision and limitation, the term "mounting" "connection" "connecting" "fixing" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or into an organic whole, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two elements of the interaction relationship. For ordinary skilled in the art, the above-mentioned terms can be understood in the specific meaning in the utility model according to specific circumstances.

[0062] The present application is disclosed as above with preferred embodiments, but is not intended to limit the claims, any person skilled in the art can make several possible changes and modifications without departing from the concept of the present application, therefore the protection scope of the present application should be limited by the scope defined by the claims of the present application.

[0063] The utility model will be described in further detail below in conjunction with specific embodiments, but the embodiments of the utility model are not limited to this.

[0064] Embodiment 1

[0065] As Figure 1 As shown in 3, in order to solve the problem of unstable structure and low quality of battery finished product caused by the shaking problem of the existing series-parallel electric core, the present application provides a series-parallel electric core. The series-parallel electric core comprises a first lamination body 1, a second lamination body 2 connected in series with the first lamination body 1, a third lamination body 3 connected in parallel with the first lamination body 1 and a shell 4. The first lamination body 1 is connected in series with the second lamination body 2 through a first connecting tab 5, and the first lamination body 1 is connected in parallel with the third lamination body 3 through a second connecting tab 6. The shell 4 is provided with an assembly cavity 41 for assembling the first lamination body 1, the second lamination body 2 and the third lamination body 3. In this way, the structural stability of the electric core is significantly improved, and the quality of the finished product is also improved.

[0066] Specifically, the first lamination body 1 of the present application constitutes the core of improving the technical scheme of the existing series-parallel electric core which can only be externally wired and then stacked. Since the first lamination body 1 of the present application can be directly assembled into the assembly cavity 41 of the shell 4, the first lamination body 1, the second lamination body 2 and the third lamination body 3 are connected by connecting tabs in the shell 4. This way of wiring inside the shell 4 effectively avoids the technical scheme of external wiring and then stacking in the prior art, so that the lamination body of the present application only needs to be wired inside the battery to complete series-parallel connection, thus effectively avoiding the shaking problem caused by external stacking.

[0067] Further, the assembly cavity 41 is used to assemble the first stack 1 and the second stack 2 connected in series with the first stack 1, and the third stack 3 connected in parallel with the first stack 1. The design of the assembly cavity not only ensures the compactness of the battery cell assembly, but also ensures the alignment accuracy of the battery cell during assembly through precise size control, thereby further improving the performance and reliability of the battery cell. In addition, the shape and size of the assembly cavity 41 can be customized according to the specifications of different battery cells to meet the needs of different applications.

[0068] It is worth noting that, as Figure 1 shown in the present application, the assembly cavity 41 for assembling the stack is located near the edge side of the shell 4, thereby reserving a position for the tab of the stack to transmit the battery power. At the same time, the outer side of each assembly cavity 41 is provided with an air bag 43, which is designed to absorb the excess pressure that may be generated during assembly, ensuring the stable fixation of the stack in the assembly cavity 41, and avoiding damage to the battery cell caused by excessive pressure. The use of air bags 43 further enhances the structural stability of the battery cell, while providing additional safety during assembly.

[0069] Preferably, when assembling the stack, the first stack 1 is first placed in the assembly cavity 41, then the first stack 1 is connected to the second stack 2 through the first connecting tab 5, and the first stack 1 is connected to the third stack 3 through the second connecting tab 6. Specifically, the connection method of the connecting tab can be welding, riveting or other suitable connection technology. After connection, the reliability of the connection is checked to ensure the reliability of the connection, and then the next assembly work is carried out. After the assembly of the stack is completed, the top sealing area 42 of the shell 4 will be sealed to ensure that the chemical substances inside the battery cell do not leak to the outside environment. The sealing of the top sealing area 42 can be achieved by welding, bonding or other sealing technology. After sealing, the battery cell will undergo final quality detection, including electrical performance test and structural integrity check, to ensure that each battery cell meets the design requirements and safety standards.

[0070] Embodiment 2

[0071] As Figure 1As shown in Figure 5, unlike Embodiment 1, to further improve the connection strength between the first stacked body 1 and the second stacked body 2 connected in series, and between the first stacked body 1 and the third stacked body, the first stacked body 1 is further provided with a first empty foil 11 and a second empty foil 12; the first empty foil 11 is used to connect to the first connecting tab 5, and the second empty foil 12 is used to connect to the second connecting tab 6. This design makes the first empty foil 11 and the second empty foil 12 structurally more stable and better able to withstand the mechanical stress generated by the battery cell during charging and discharging. Furthermore, by establishing a stable connection between the empty foil and the connecting tab, the internal resistance of the battery cell can be effectively reduced, thereby improving the charging and discharging efficiency of the battery cell. In practical applications, this design not only improves the performance of the battery cell but also extends its service life.

[0072] It is worth noting that, such as Figure 1 , Figure 3 As shown, in this application, the second empty foil 12 of the first stack 1 is disposed on the top of the first stack 1, and the first empty foil 11 is disposed on either side of the first stack 1. This design allows the third stack 3, connected in parallel with the first stack 1, to be disposed on the top of the first stack 1, while the second stack 2, connected in series with the first stack 1, is disposed on the left or right side of the stack. This further optimizes the internal space utilization of the battery cell and ensures the alignment accuracy of the battery cell during assembly. Furthermore, by providing empty foils on the top and sides of the first stack 1, multi-directional connections of the battery cell can be achieved, increasing the flexibility of the battery cell design.

[0073] Furthermore, the second stack body 2 is provided with a third empty foil 21, which is connected to the first empty foil 11 through a first connecting tab 5; the third stack body 3 is provided with a fourth empty foil 31, which is connected to the second empty foil 12 through a second connecting tab 6. The third empty foil 21 and the first empty foil 11 have opposite polarities; specifically, when the third empty foil 21 is the positive current collector, the first empty foil 11 is the negative current collector; when the third empty foil 21 is the negative current collector, the first empty foil 11 is the positive current collector. This design allows the stack body to form an effective current path inside the cell (i.e., achieves internal series connection).

[0074] Similarly, the fourth empty foil 31 extending from the third stack body 3 includes a fourth positive empty foil 311 and a fourth negative empty foil 312; the second empty foil 12 includes a second positive empty foil 121 and a second negative empty foil 122; the second connecting tab 6 is provided with a second connecting positive tab 61 and a second connecting negative tab 62; the fourth positive empty foil 311 and the second positive empty foil 121 are connected through the second connecting positive tab 61, and the fourth negative empty foil 312 and the second negative empty foil 122 are connected through the second connecting negative tab 62. This ensures a uniform distribution of current within the cell, thereby improving the overall performance of the cell, while also maintaining the internal parallel connection between the first stack body 1 and the stack bodies.

[0075] Furthermore, the second stack body 2 and / or the third stack body 3 extend with a fifth empty foil 22 or a sixth empty foil 23. The fifth empty foil 22 and the sixth empty foil 23 are used to connect with the external electrode 7, which is used to output the power of the series-parallel battery cells. The arrangement of the fifth empty foil 22 and the sixth empty foil 23 makes the power output of the battery cells more convenient and efficient. The connection method between the fifth empty foil 22 and the sixth empty foil 23 and the external electrode 7 can also be welding, riveting, or other suitable connection techniques. Furthermore, the external electrode 7 is a first external electrode 71 or a second external electrode 72; the fifth empty foil 22 is connected to the first external electrode 71, and the sixth empty foil 23 is connected to the second external electrode 72. The fifth empty foil 22 and the sixth empty foil 23 have opposite polarities.

[0076] It is worth noting that, such as Figure 3 As shown, in the third stack body 3 with a fourth empty foil 31, the fourth empty foil 31 and the fifth empty foil 22 are symmetrically arranged; in the second stack body 2 with a third empty foil 21, the third empty foil 21 and the sixth empty foil 23 are symmetrically arranged. Furthermore, in the series-parallel cell design of this application, the second stack body 2 and the third stack body 3 are respectively provided with fifth empty foil 22 and sixth empty foil 23 of opposite polarities, thereby transmitting the series-parallel cell of this application to the power consumption terminal.

[0077] In the specific implementation process, such as Figure 5 In the four-cell series-parallel design shown, the housing 4 simultaneously reserves four assembly cavities 41 to respectively assemble a first stacked body 1, a second stacked body 2, a third stacked body 3 with a fourth empty foil 31, and a fourth stacked body 8 with a fourth empty foil 31; wherein, the second stacked body 2 is connected in parallel with the fourth stacked body 8 through the second connecting tab 6, and the first stacked body 1 is connected in parallel with the third stacked body 3 through the second connecting tab 6.

[0078] Similarly, the series-parallel battery cell of this application can also consist of a fifth empty foil 22 and a sixth empty foil 23 respectively extending from a third stack body 3 having a fourth empty foil 31 and a second stack body 2 having a third empty foil 21, as shown. Figure 3 The three-cell series-parallel design shown includes a housing 4 with three pre-reserved assembly cavities 41 for assembling a first stacked cell 1, a third stacked cell 3 with a fourth empty foil 31, and a second stacked cell 2 with a third empty foil 21. These two series-parallel cell designs ensure the stability and safety of the cell's power output.

[0079] Furthermore, in this application, the first stack 1, the second stack 2, and the third stack 3 are all formed by stacking a positive electrode, a separator, and a negative electrode. The positive and negative electrode are separated by a separator to prevent direct contact between the positive and negative electrodes, which could cause a short circuit. During the charging and discharging process of the battery cell, the separator allows ions in the electrolyte to pass through while preventing the direct flow of electrons, ensuring the normal progress of the electrochemical reaction.

[0080] Other implementations that are the same as those described herein will not be repeated here.

[0081] Implementation Method 3

[0082] like Figure 1 As shown in Figure 5, unlike Embodiment 1, in order to further improve the stability of the parallel-connected battery cell in this application, the parallel-connected battery cell in this application further includes a fourth lamination body 8, and the second lamination body 2 and the fourth lamination body 8 are connected in parallel through the second connecting tab 6. Thus, this application optimizes the current path inside the battery cell through the third lamination body 3 and the fourth lamination body 8, thereby enhancing the battery cell's power output capability.

[0083] Furthermore, both the first connecting tab 5 and the second connecting tab 6 are provided with tab adhesive areas 51, which are coated with tab adhesive. The coating of tab adhesive effectively prevents corrosion and oxidation between the connecting tabs and the battery cell, extending the battery cell's lifespan. The design of the tab adhesive areas 51 ensures the uniformity and consistency of the coating process, thereby guaranteeing the stability and reliability of the battery cell during long-term use. In addition, the use of tab adhesive can also improve the battery cell's adaptability to extreme environments, such as high temperature and high humidity conditions.

[0084] Further, the shell 4 is provided with a top sealing area 42, and the outer electrode lug 7 is arranged in the top sealing area 42. The design of the top sealing area 42 not only ensures the sealing of the chemical substances inside the battery cell, but also ensures the alignment accuracy of the battery cell during assembly through precise size control, thereby further improving the performance and reliability of the battery cell. The closure of the top sealing area 42 can be achieved by welding, bonding or other sealing techniques to ensure that the chemical substances inside the battery cell do not leak to the external environment. Therefore, after the assembly of the laminated core is completed, the top sealing area 42 of the shell 4 will be closed to ensure that the chemical substances inside the battery cell do not leak to the external environment. The closure of the top sealing area 42 can be achieved by welding, bonding or other sealing techniques. After the closure is completed, the battery cell will undergo final quality detection, including electrical performance test and structural integrity check, to ensure that each battery cell meets the design requirements and safety standards.

[0085] Other than the same as the embodiments, the present embodiment will not be described again.

[0086] The preferred embodiments of the present application have been described above, but the present application is not limited to the above-mentioned embodiments, and various modifications and changes can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A string of parallel cells, characterized in that, The first lamination body (1), the second lamination body (2) connected in series with the first lamination body (1), the third lamination body (3) connected in parallel with the first lamination body (1) and the shell (4) are included. The first lamination body (1) is connected in series with the second lamination body (2) through the first connecting tab (5), and the first lamination body (1) is connected in parallel with the third lamination body (3) through the second connecting tab (6). The shell (4) is provided with an assembly cavity (41) for assembling the first lamination body (1), the second lamination body (2) and the third lamination body (3).

2. The string-parallel cell of claim 1, wherein, The first lamination body (1) is provided with a first empty foil (11) and a second empty foil (12). The first empty foil (11) is used to be connected with the first connecting tab (5), and the second empty foil (12) is used to be connected with the second connecting tab (6).

3. The string-parallel cell of claim 2, wherein, The second lamination body (2) is provided with a third empty foil (21), and the third empty foil (21) is connected with the first empty foil (11) through the first connecting tab (5).

4. The string-parallel cell of claim 3, wherein, The third lamination body (3) is provided with a fourth empty foil (31), and the fourth empty foil (31) is connected with the second empty foil (12) through the second connecting tab (6).

5. The string-parallel cell of claim 3, wherein, The polarity of the third empty foil (21) is opposite to that of the first empty foil (11). When the third empty foil (21) is a positive current collector, the first empty foil (11) is a negative current collector. When the third empty foil (21) is a negative current collector, the first empty foil (11) is a positive current collector.

6. The string-parallel cell of claim 4, wherein, The fourth empty foil (31) includes a fourth positive empty foil (311) and a fourth negative empty foil (312). The second empty foil (12) includes a second positive empty foil (121) and a second negative empty foil (122). The second connecting tab (6) is provided with a second connecting positive tab (61) and a second connecting negative tab (62). The fourth positive empty foil (311) and the second positive empty foil (121) are connected through the second connecting positive tab (61), and the fourth negative empty foil (312) and the second negative empty foil (122) are connected through the second connecting negative tab (62).

7. The string-parallel cell of claim 1, wherein, Further comprising an external connecting tab (7), the external connecting tab (7) includes a first external connecting tab (71) and a second external connecting tab (72), the second lamination body (2) is provided with a fifth empty foil (22) in extension, and the third lamination body (3) is provided with a sixth empty foil (23) in extension. The fifth empty foil (22) is connected with the first external connecting tab (71), the sixth empty foil (23) is connected with the second external connecting tab (72), and the external connecting tab (7) is used to output the electric energy of the series-parallel battery cell.

8. The string-parallel cell of claim 1, wherein, Further comprising a fourth lamination body (8). The third lamination body (3) and the fourth lamination body (8) are connected in parallel through the second connecting tab (6).

9. The string-parallel cell of claim 1, wherein, The first connecting tab (5) and the second connecting tab (6) are both provided with a tab rubber area (51), and the tab rubber area (51) is provided with a tab rubber.

10. The string-parallel cell of claim 7, wherein, The shell (4) is provided with a top sealing area (42), and the outer connecting tab (7) is arranged in the top sealing area (42).

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