A staggered cell structure of a square lithium-ion battery

Abstract

The present invention proposes a staggered cell structure of a square lithium-ion battery, including a cell group; multiple heat dissipation gaps are staggered on both sides of the cell group; the cell group includes multiple single cells arranged side by side, and an integrated plate arranged on the top of the single cells; two adjacent single cells are staggered and offset. The cell group is formed by offsetting multiple single cells and then assembling them using an integrated plate, so that multiple heat dissipation gaps are formed on both sides of the cell group, which greatly increases the specific surface area of ​​the cell group and significantly improves the heat dissipation performance of the cell group, so that the structure of the present application can achieve a better heat dissipation effect without the need to set up a heat dissipation device; moreover, compared with the use of signal acquisition lines and connecting sheets to assemble a single cell, the use of an integrated plate to connect the single cell is more stable, and the assembly is simple and quick, and the cell group will not cause cell group failure due to looseness during operation, which significantly improves the overall safety performance of the cell group.

Description

Technical Field

[0001] The invention relates to the technical field of lithium ion batteries, and in particular to a staggered cell structure of a square lithium ion battery. Background Art

[0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive electrode and the negative electrode to work. During the charging and discharging process, lithium ions are intercalated and deintercalated between the positive electrode and the negative electrode: during the charging process, lithium ions are deintercalated from the positive electrode and intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the discharging process is the opposite of the charging process.

[0003] At present, the cell structure of lithium-ion batteries on the market is usually a symmetrical structure of positive and negative electrodes: the explosion-proof valve is set at the center of the sealing cover, and the positive and negative poles are symmetrically set on both sides of the explosion-proof valve. When assembling single cells of this structure into groups, multiple connecting pieces are required to connect the single cells one by one, and independent voltage signal acquisition lines are required to collect the voltage data of the single cells.

[0004] However, after the battery cells of the above structure are assembled, the specific surface area is small and the heat dissipation effect is poor, especially when the battery cell group is discharged with a large current. Since the heat cannot be dissipated quickly, it is usually necessary to add a heat dissipation device / system between the battery cells to improve the heat dissipation effect in order to ensure the normal operation of the battery cell group; and the use of connecting plates and signal acquisition lines during the assembly process will complicate the assembly production process of the battery cells, resulting in complex assembly of the battery cell group and low assembly efficiency. During the operation of the battery cell group, it is easy to cause failures due to loose signal acquisition lines or connecting plates, affecting the overall safety performance of the battery. Summary of the invention

[0005] Based on this, the present invention provides a staggered cell structure of a square lithium-ion battery, which aims to solve the problem that after the traditional square lithium-ion battery cells are assembled, the specific surface area is small and the heat dissipation effect is poor. In particular, when the cell group discharges a large current, since the heat cannot be dissipated quickly, it is usually necessary to add a heat dissipation device / system between the cells to improve the heat dissipation effect in order to ensure the normal operation of the cell group; and the use of connecting pieces and signal acquisition lines during the assembly process will complicate the assembly production process of the cell, resulting in complex assembly of the cell group and low assembly efficiency. During the operation of the cell, it is easy to cause malfunctions due to loose signal acquisition lines or connecting pieces, affecting the overall safety performance of the battery.

[0006] To achieve the above object, the present invention proposes the following technical solutions:

[0007] A staggered cell structure of a square lithium-ion battery comprises a cell group; a plurality of heat dissipation gaps are staggeredly arranged on both sides of the cell group; the cell group comprises a plurality of single cells arranged side by side, and an integrated plate arranged on top of the single cells; two adjacent single cells are staggered and abutted.

[0008] Furthermore, two adjacent single cells are flipped and abutted against each other.

[0009] In the present application, two adjacent single cells are flipped and offset against each other, which means that one of the single cells is used as a reference, the other single cell is rotated 180 degrees, and then the two are abutted against each other; at this time, the positive electrode of one of the single cells corresponds to the negative electrode of the other single cell.

[0010] Furthermore, a plurality of the single cells are connected in series via the integrated plate.

[0011] Furthermore, the integrated board includes a connecting piece, a protective plate, and a data acquisition module arranged on the protective plate; one side of the connecting piece is connected to the single cell, and the other side is connected to the protective plate; the width of the protective plate is smaller than the distance between the positive and negative electrodes of the single cell; the connecting piece is used to connect the positive and negative electrodes of two adjacent single cells; the data acquisition module is used to collect voltage data of the single cell.

[0012] Furthermore, a positive electrode connection hole and a negative electrode connection hole are respectively provided at both ends of the connection sheet; the positive electrode connection hole is adapted to the positive electrode of the single battery cell; and the negative electrode connection hole is adapted to the negative electrode of the single battery cell.

[0013] In the present application, the connecting piece is used to connect two adjacent single cells. Therefore, for the same connecting piece, after the positive electrode connecting hole is connected to the positive electrode of one single cell, the negative electrode connecting hole should be connected to the negative electrode of another single cell, so that a series structure is formed between the two adjacent single cells. Similarly, the connection between multiple single cells and the connecting piece is also the same. It should be noted that one end of the outermost connecting piece of the cell group is connected to the positive or negative electrode of the single cell, and the other end is an active end, that is, it acts as the positive or negative electrode of the cell group for connection with the outside world.

[0014] Furthermore, a plurality of connecting pins are provided on opposite sides of the protection plate; the connecting pins correspond one-to-one to the connecting sheets.

[0015] Furthermore, the single cell includes a cell body; the end surface of the cell body close to the integrated plate is provided with a negative electrode column, a positive electrode column, an explosion-proof valve and a liquid injection hole in sequence; the negative electrode column is adapted to the negative electrode connection hole; the positive electrode column is adapted to the positive electrode connection hole.

[0016] Furthermore, the negative electrode column and the positive electrode column are arranged asymmetrically.

[0017] In the present application, the explosion-proof valve is arranged on the side of the positive pole away from the negative pole, and the explosion-proof valve is arranged between the positive pole and the injection hole. In this way, the negative pole and the positive pole are arranged asymmetrically on the end surface of the single cell.

[0018] In the present application, the explosion-proof valve is arranged on the side of the positive pole away from the negative pole, so that after the single battery cell and the integrated board are assembled, the integrated board will not cover the explosion-proof valve, thereby avoiding safety accidents caused by the explosion-proof valve being covered and improving the safety performance of the battery cell group.

[0019] Furthermore, an explosion-proof disc is arranged inside the explosion-proof valve.

[0020] The present invention proposes a square lithium-ion battery staggered cell structure, which is formed into a cell group by offsetting multiple single cells and assembling them with an integrated plate, so that multiple heat dissipation gaps are formed on both sides of the cell group, which greatly increases the specific surface area of ​​the cell group and significantly improves the heat dissipation performance of the cell group, so that the structure of the present application can achieve a good heat dissipation effect without the need to set up a heat dissipation device; at the same time, an integrated plate is used to connect multiple single cells, the signal acquisition line is eliminated, the assembly process of the cell group is simplified, the production efficiency of the cell group is improved, and the production cost of the cell group is reduced. In addition, compared with the use of signal acquisition lines and connecting sheets to assemble a single cell, the use of an integrated plate to connect the single cells is more stable, and the assembly is simple and quick. The cell group will not cause cell group failure due to looseness during operation, which significantly improves the overall safety performance of the cell group. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 This is a three-dimensional diagram of the staggered cell structure of the square lithium-ion battery according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A magnified schematic diagram of the local A in the middle;

[0024] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of a single cell.

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] At present, after the battery cell group on the market is assembled, the specific surface area is small and the heat dissipation effect is poor. Especially when the battery cell group discharges a large current, since the heat cannot be quickly dissipated, it is usually necessary to add a heat dissipation device / system between the battery cells to improve the heat dissipation effect to ensure the normal operation of the battery cell group; and the use of connecting pieces and signal acquisition lines during the assembly process will complicate the assembly and production process of the battery cell, resulting in complex assembly of the battery cell group and low assembly efficiency. During the operation of the battery cell, it is easy to cause a malfunction due to the looseness of the signal acquisition line or the connecting piece, affecting the overall safety performance of the battery. In order to solve the above technical problems, the present invention proposes a staggered battery cell structure of a square lithium-ion battery.

[0032] like Figure 1 As shown, an embodiment of the present invention proposes a staggered cell structure of a square lithium-ion battery, including a cell group 1; a plurality of heat dissipation gaps 2 are staggeredly arranged on both sides of the cell group 1; the cell group 1 includes a plurality of single cells 11 arranged side by side, and an integrated plate 12 arranged on the top of the single cells 11; two adjacent single cells 11 are staggered and abutted against each other.

[0033] Two adjacent single cells 11 are turned over and abut against each other.

[0034] Specifically, in the embodiment of the present application, two adjacent single cells 11 are flipped and abutted against each other, which means that one of the single cells 11 is used as a reference, the other single cell 11 is rotated 180 degrees, and then the two are abutted against each other; at this time, the positive electrode of one of the single cells 11 corresponds to the negative electrode of the other single cell 11.

[0035] The plurality of single cells 11 are connected in series via the integrated plate 12 .

[0036] Reference Figure 2In this embodiment, the integrated board 12 includes a connecting piece 121, a protective plate 122, and a data acquisition module (not shown in the figure) arranged on the protective plate 122; one side of the connecting piece 121 is connected to the single battery cell 11, and the other side is connected to the protective plate 122; the width of the protective plate 122 is smaller than the distance between the positive and negative electrodes of the single battery cell 11; the connecting piece 121 is used to connect the positive and negative electrodes of two adjacent single battery cells 11; the data acquisition module is used to collect voltage data of the single battery cell 11.

[0037] The two ends of the connecting piece 121 are respectively provided with a positive electrode connecting hole 1211 and a negative electrode connecting hole 1212 ; the positive electrode connecting hole 1211 is adapted to the positive electrode of the single battery cell 11 ; the negative electrode connecting hole 1212 is adapted to the negative electrode of the single battery cell 11 .

[0038] Specifically, in the embodiment of the present application, the connecting piece 121 is used to connect two adjacent single cells 11. Therefore, for the same connecting piece 121, after the positive electrode connecting hole 1211 is connected to the positive electrode of one single cell 11, the negative electrode connecting hole 1212 should be connected to the negative electrode of another single cell 11, so that a series structure is formed between the two adjacent single cells 11. Similarly, the connection between the multiple single cells 11 and the connecting piece 121 is also the same. It should be noted that one end of the outermost connecting piece 121 of the cell group 1 is connected to the positive or negative electrode of the single cell 11, and the other end is an active end, that is, it serves as the positive or negative electrode of the cell group 1, which is used to connect to the outside world.

[0039] A plurality of connecting pins 1221 are further disposed on opposite sides of the protection plate 122 ; the connecting pins 1221 correspond one-to-one to the connecting sheets 121 .

[0040] Reference Figure 3 In this embodiment, the single cell 11 includes a cell body 111; a negative electrode column 112, a positive electrode column 113, an explosion-proof valve 114 and a liquid injection hole 115 are sequentially arranged on the end surface of the cell body 111 close to the integrated plate 12; the negative electrode column 112 is adapted to the negative electrode connection hole 1212; the positive electrode column 113 is adapted to the positive electrode connection hole 1211.

[0041] The negative electrode column 112 and the positive electrode column 113 are arranged asymmetrically.

[0042] Specifically, in the embodiment of the present application, the explosion-proof valve 114 is arranged on the side of the positive electrode column 113 away from the negative electrode column 112, and the explosion-proof valve 114 is arranged between the positive electrode column 113 and the injection hole 115. In this way, the negative electrode column 112 and the positive electrode column 113 are arranged asymmetrically on the end surface of the single battery cell 11.

[0043] In the embodiment of the present application, the explosion-proof valve 114 is arranged on the side of the positive electrode column 113 away from the negative electrode column 112, so that after the single battery cell 11 and the integrated plate 12 are assembled, the integrated plate 12 will not cover the explosion-proof valve 114, thereby avoiding safety accidents caused by the explosion-proof valve 114 being covered, and improving the safety performance of the battery cell group 1.

[0044] The explosion-proof valve 114 is provided with an explosion-proof disc (not shown in the figure).

[0045] It should be noted that in the embodiment of the present application, two adjacent single cells 11 are staggered and abutted, which means that after the two adjacent single cells 11 are flipped and abutted, due to the asymmetrical arrangement of the negative pole and the positive pole of the single cell 11, the two single cells 11 will be staggered, that is, the side close to the injection hole of one of the single cells 11 will extend partly toward the side close to the negative pole of the other single cell 11. When multiple adjacent single cells 11 are staggered and abutted, a heat dissipation gap 2 will be formed, which greatly increases the specific surface area of ​​the cell group 1 and improves the heat dissipation performance of the cell group 1.

[0046] In the embodiment of the present application, the connection between the connecting piece 121 and the connecting pin 1221 and the connection between the connecting piece 121 and the positive and negative poles of two adjacent single cells 11 are both welded.

[0047] The present invention proposes a staggered cell structure of a square lithium-ion battery. A plurality of single cells 11 are offset and then assembled using an integrated plate 12 to form a cell group 1, so that a plurality of heat dissipation gaps 2 are formed on both sides of the cell group 1, which greatly increases the specific surface area of ​​the cell group 1 and significantly improves the heat dissipation performance of the cell group 1, so that the structure of the present application can achieve a good heat dissipation effect without the need to set up a heat dissipation device; at the same time, an integrated plate 12 is used to connect a plurality of single cells 11, the signal acquisition line is eliminated, the assembly process of the cell group 1 is simplified, the production efficiency of the cell group 1 is improved, and the production cost of the cell group 1 is reduced. In addition, compared with the use of signal acquisition lines and connecting sheets to assemble a single cell 11, the use of an integrated plate 12 to connect the single cells 11 is more stable, and the assembly is simple and quick. The cell group 1 will not cause cell group failure due to looseness during operation, which significantly improves the overall safety performance of the cell group 1.

[0048] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A staggered cell structure of a square lithium-ion battery, characterized in that: It comprises a battery cell group; a plurality of heat dissipation gaps are arranged at two sides of the battery cell group in a staggered manner; the battery cell group comprises a plurality of single battery cells arranged side by side, and an integrated plate arranged on the top of the single battery cells; two adjacent single battery cells are staggered and abutted, and two adjacent single battery cells are flipped and abutted; Two adjacent single cells are flipped and abutted, which means that one of the single cells is used as a reference, the other single cell is rotated 180 degrees, and then the two are abutted; at this time, the positive electrode of one of the single cells corresponds to the negative electrode of the other single cell; the single cell includes a cell body, and a positive electrode column and a negative electrode column are arranged on the end surface of the cell body close to the integrated plate, and the negative electrode column is arranged asymmetrically with the positive electrode column; The integrated board includes a connecting piece, a protective board, and a data acquisition module arranged on the protective board; one side of the connecting piece is connected to the single battery cell, and the other side is connected to the protective board; the width of the protective board is smaller than the distance between the positive and negative electrodes of the single battery cell.

2. The staggered cell structure of a square lithium-ion battery according to claim 1, characterized in that: A plurality of the single cells are connected in series via the integrated plate.

3. The staggered cell structure of a square lithium-ion battery according to claim 1, characterized in that: The two ends of the connecting sheet are respectively provided with a positive electrode connecting hole and a negative electrode connecting hole; the positive electrode connecting hole is adapted to the positive electrode of the single battery cell; the negative electrode connecting hole is adapted to the negative electrode of the single battery cell.

4. The staggered cell structure of a square lithium-ion battery according to claim 1, characterized in that: A plurality of connecting pins are also arranged on opposite sides of the protection plate; the connecting pins correspond one to one with the connecting sheets.

5. The staggered cell structure of a square lithium-ion battery according to claim 3, characterized in that: The battery cell body also includes an explosion-proof valve and a liquid injection hole; the end surface of the battery cell body close to the integrated plate is provided with the negative electrode column, the positive electrode column, the explosion-proof valve and the liquid injection hole in sequence; the negative electrode column is adapted to the negative electrode connection hole; the positive electrode column is adapted to the positive electrode connection hole.

6. The staggered cell structure of a square lithium-ion battery according to claim 5, characterized in that: An explosion-proof disc is arranged inside the explosion-proof valve.

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