Method for manufacturing sheet battery module and multilayer battery module

Abstract

The present invention relates to the field of battery technology and discloses a method for manufacturing a sheet-shaped battery module. A first soft-pack battery cell and a second soft-pack battery cell are respectively installed on the upper and lower parts of a first sheet-shaped shell, and the positive / negative electrode of the first soft-pack battery cell is electrically connected to the negative / positive electrode of the adjacent second soft-pack battery cell. This produces a sheet-shaped battery module in which each first soft-pack battery cell and each second soft-pack battery cell are not stacked or in contact with each other, thereby avoiding internal heat buildup in the battery module and ensuring that each first soft-pack battery cell and each second soft-pack battery cell are within a normal temperature range, thereby improving the service life of the battery module. Also disclosed is a method for manufacturing a multi-layer battery module. A plurality of sheet-shaped battery modules are connected in parallel. The flow-conducting gap between each two adjacent sheet-shaped battery modules can reduce the temperature interference between the sheet-shaped battery modules, so that each sheet-shaped battery module can be within the same temperature range.

Description

Technical Field

[0001] The present invention relates to the field of battery manufacturing, and in particular to a method for manufacturing a sheet-shaped battery module and a multi-layer battery module. Background Art

[0002] In recent years, with the continuous development of the battery industry, lithium-ion batteries have been widely used in electric vehicles and energy storage due to their advantages such as high energy density, recyclability, and long life. Lithium-ion battery modules include multiple soft-pack cells. The structural design of the battery module will directly affect the service life of the soft-pack cells. In the battery module of the prior art, multiple soft-pack cells are assembled and manufactured in a stacked manner. The battery module obtained by this manufacturing method is in a block shape. The soft-pack cells are in direct contact or have only very small gaps. This makes the heat dissipation of the battery module insufficient and cannot ensure that the temperature of each cell is within the same range. The battery module has serious internal heat buildup, making the temperature of the internal cells higher than that of the edge cells, resulting in uneven temperature field distribution and uneven cell life, which seriously affects the life of the battery module. Summary of the Invention

[0003] In view of the above technical problems existing in the prior art, the present invention provides a method for manufacturing a sheet-shaped battery module, which can obtain a sheet-shaped battery module, avoid heat accumulation inside the battery module, and improve the service life of the battery module.

[0004] The present invention provides a method for manufacturing a sheet-shaped battery module, and a technical solution for solving the technical problem thereof is as follows: a method for manufacturing a sheet-shaped battery module, comprising the following steps:

[0005] S1. Provide a first sheet-shaped housing, and install a first insulating gasket in the first sheet-shaped housing;

[0006] S2. Provide a plurality of first soft-packed battery cells and second soft-packed battery cells, install the first soft-packed battery cells on the upper portion of the first sheet-shaped shell with the tabs of the first soft-packed battery cells facing downward, install the second soft-packed battery cells on the lower portion of the first sheet-shaped shell with the tabs of the second soft-packed battery cells facing upward, and electrically connect the positive / negative electrodes of the first soft-packed battery cells to the negative / positive electrodes of the adjacent second soft-packed battery cells;

[0007] S3. Provide a second sheet shell, install a second insulating gasket in the second sheet shell, and snap-fit ​​the second sheet shell onto the first sheet shell, while positioning the tabs of the first soft-pack battery cell and the tabs of the second soft-pack battery cell between the first insulating gasket and the second insulating gasket.

[0008] In the above-mentioned method for manufacturing a sheet battery module, in step S2, conductive structural adhesive is applied to the soft surfaces of the first soft-pack battery cell and the second soft-pack battery cell, and the soft surfaces of the first soft-pack battery cell and the second soft-pack battery cell are tightly fixed in the first sheet shell.

[0009] In the above-mentioned method for manufacturing the sheet-shaped battery module, in the step S2, after the conductive structural adhesive is solidified, the first soft-pack battery cell and the second soft-pack battery cell are welded and fixed.

[0010] In the above-mentioned method for manufacturing a sheet-shaped battery module, in step S3, the first sheet-shaped shell and the second sheet-shaped shell are fixedly connected by using glue.

[0011] In the above-mentioned method for manufacturing a sheet-shaped battery module, the number of the first soft-pack battery cells and the number of the second soft-pack battery cells are not equal.

[0012] The manufacturing method of the sheet-shaped battery module of the present invention has at least the following beneficial effects: the manufacturing method installs the first soft-pack battery cell and the second soft-pack battery cell on the upper and lower parts of the first sheet-shaped shell, respectively, and electrically connects the positive electrode / negative electrode of the first soft-pack battery cell to the negative electrode / positive electrode of the adjacent second soft-pack battery cell, thereby obtaining a sheet-shaped battery module, in which the first soft-pack battery cell and the second soft-pack battery cell are not stacked or contacted, thereby avoiding heat buildup inside the battery module, and ensuring that each first soft-pack battery cell and the second soft-pack battery cell are within a normal temperature range, thereby improving the service life of the battery module.

[0013] The present invention also provides a method for manufacturing a multi-layer battery module, comprising the following steps:

[0014] Step 1: Using the above-mentioned method for manufacturing a sheet-shaped battery module, manufacture a plurality of sheet-shaped battery modules;

[0015] Step 2: Connect multiple sheet-shaped battery modules in parallel, with a flow-conducting gap between every two adjacent sheet-shaped battery modules.

[0016] The above-mentioned method for manufacturing the multi-layer battery module further includes the following steps:

[0017] Step 3: Install a pipeline for cooling or heating in the guide gap, where the flow medium in the pipeline is gas or liquid.

[0018] In the above-mentioned method for manufacturing the multi-layer battery module, in step S2, before installing the first soft-pack battery cell and the second soft-pack battery cell, fixing holes are punched on the tabs of the first soft-pack battery cell and the second soft-pack battery cell. When installing the first soft-pack battery cell and the second soft-pack battery cell, the fixing holes on the tabs of the first soft-pack battery cell are aligned with the fixing holes on the tabs of the second soft-pack battery cell.

[0019] The above-mentioned method for manufacturing a multi-layer battery module further includes the following steps after step S3: inserting a current lead-out body into the fixing hole on the tab of the first soft-pack battery cell and the fixing hole on the tab of the second soft-pack battery cell, and the two ends of the current lead-out body extend out of the first sheet shell and the second sheet shell respectively.

[0020] The manufacturing method of the multi-layer battery module of the present invention connects multiple first soft-pack battery cells and second soft-pack battery cells in series to obtain multiple sheet battery modules, and then connects the multiple sheet battery modules in parallel, which can change the "parallel first and then series" connection method in the prior art to obtain a multi-layer battery module. The battery module dissipates heat through the surface, which can avoid heat accumulation. The guide gap between each adjacent two sheet battery modules can reduce the temperature interference between the sheet battery modules, so that each sheet battery module can be in the same temperature range, thereby improving the service life of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0022] Figure 1 This is one of the manufacturing flow charts of a sheet battery module according to an embodiment of the present invention;

[0023] Figure 2 This is the second manufacturing flow chart of the sheet battery module according to an embodiment of the present invention;

[0024] Figure 3 This is the third manufacturing flow chart of the sheet battery module according to an embodiment of the present invention;

[0025] Figure 4 FIG. 4 is a flowchart of manufacturing a multi-layer battery module according to an embodiment of the present invention.

[0026] In the accompanying drawings: 100 first sheet shell, 110 first insulating gasket, 200 first soft-pack battery cell, 300 second soft-pack battery cell, 400 tab, 410 fixing hole, 500 second sheet shell, 510 second insulating gasket, 600 current guide gap, 700 current lead-out body. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below. Figures 1 to 3 , an embodiment of the present invention provides a method for manufacturing a sheet-shaped battery module, comprising the following steps:

[0028] S1, such as Figure 1 As shown, a first sheet-shaped housing 100 is provided, and a first insulating gasket 110 is installed in the first sheet-shaped housing 100;

[0029] S2, such as Figure 2As shown, a plurality of first soft-packed battery cells 200 and second soft-packed battery cells 300 are provided. The first soft-packed battery cells 200 are installed on the upper part of the first sheet-shaped shell 100 with the tabs 400 of the first soft-packed battery cells 200 facing downward, and the second soft-packed battery cells 300 are installed on the lower part of the first sheet-shaped shell 100 with the tabs 400 of the second soft-packed battery cells 300 facing upward, so that the positive / negative electrodes of the first soft-packed battery cells 200 are electrically connected to the negative / positive electrodes of the adjacent second soft-packed battery cells 300.

[0030] S3, such as Figure 3 As shown, a second sheet shell 500 is provided, a second insulating gasket 510 is installed in the second sheet shell 500, and the second sheet shell 500 is snap-fitted and installed on the first sheet shell 100, while the tab 400 of the first soft-pack battery cell 200 and the tab 400 of the second soft-pack battery cell 300 are located between the first insulating gasket 110 and the second insulating gasket 510.

[0031] In this manufacturing method, the first soft-pack battery cell 200 and the second soft-pack battery cell 300 are respectively installed on the upper and lower parts of the first sheet-shaped shell 100, and the positive / negative pole of the first soft-pack battery cell 200 is electrically connected to the negative / positive pole of the adjacent second soft-pack battery cell 300, and the first soft-pack battery cell 200 and the second soft-pack battery cell 300 are connected in series, thereby obtaining a sheet-shaped battery module, in which each first soft-pack battery cell 200 and the second soft-pack battery cell 300 are not stacked and contacted. The contact mentioned here refers to the contact between the surfaces, not the contact between the tabs 400. This structure can avoid heat buildup inside the battery module and ensure that each first soft-pack battery cell 200 and the second soft-pack battery cell 300 are within a normal temperature range. The temperature fields of each first soft-pack battery cell 200 and the second soft-pack battery cell 300 are consistent, and the service life is similar, which can improve the service life of the battery module.

[0032] In the manufacturing method of the present invention, the pre-installed first insulating gasket 110 and the second insulating gasket 510 can play the role of insulation protection when the first soft-pack battery cell 200 and the second soft-pack battery cell 300 are subsequently installed. At the same time, they can also provide an installation reference position for the first soft-pack battery cell 200 and the second soft-pack battery cell 300 to facilitate quick positioning and installation. Specifically, the first insulating gasket 110 and the second insulating gasket 510 can both be made of insulating materials such as ABS material or PP. Specifically, in an embodiment of the present invention, the electrochemical properties of the first soft-pack battery cell 200 and the second soft-pack battery cell 300 used are consistent, such as voltage, internal resistance, capacitance, and self-discharge.

[0033] Specifically, in step S2, a conductive structural adhesive is applied to the soft-package surface of the first soft-package battery cell 200 and the second soft-package battery cell 300, and the soft-package surface of the first soft-package battery cell 200 and the second soft-package battery cell 300 is tightly fixed in the first sheet shell 100 to pre-fix the first soft-package battery cell 200 and the second soft-package battery cell 300. After the conductive structural adhesive is applied, the first soft-package battery cell 200 and the second soft-package battery cell 300 can be tightly fixed in the first sheet shell 100 without increasing the volume occupied by the first soft-package battery cell 200 and the second soft-package battery cell 300, thereby making the structure of the battery module more compact and simplifying the manufacturing process. Further, after the conductive structural adhesive solidifies, the first soft-package battery cell 200 and the second soft-package battery cell 300 are welded and fixed to maintain a stable connection between the first soft-package battery cell 200 and the second soft-package battery cell 300 and to increase the fixing reliability of the first soft-package battery cell 200 and the second soft-package battery cell 300.

[0034] Specifically, in step S3, the sample glue securely connects the first sheet shell 100 to the second sheet shell 500, eliminating the need for additional fixing structures on the first sheet shell 100 and the second sheet shell 500. This simplifies the manufacturing process of the present invention, improves manufacturing efficiency, and saves manufacturing costs. Specifically, the glue used is a glue with a certain degree of heat resistance. Specifically, the number of first soft-pack battery cells 200 and second soft-pack battery cells 300 is unequal. In an embodiment of the present invention, two first soft-pack battery cells 200 are provided, and three second soft-pack battery cells 300 are provided. Specifically, the manufacturing material of the first sheet shell 100 and the second sheet shell 500 is both aluminum.

[0035] An embodiment of the present invention further provides a method for manufacturing a multi-layer battery module, comprising the following steps:

[0036] Step 1: Using the above-mentioned method for manufacturing a sheet-shaped battery module, manufacture a plurality of sheet-shaped battery modules;

[0037] Step 2: Figure 4 As shown, a plurality of sheet-shaped battery modules are connected in parallel, and a flow-guiding gap 600 is provided between every two adjacent sheet-shaped battery modules.

[0038] The manufacturing method of the multi-layer battery module of the present invention connects multiple first soft-pack battery cells 200 and second soft-pack battery cells 300 in series to obtain multiple sheet battery modules, and then connects the multiple sheet battery modules in parallel, which can change the "parallel first and then series" connection method in the prior art to obtain a multi-layer battery module. The battery module dissipates heat through the surface, which can avoid heat accumulation. The guide gap 600 between each two adjacent sheet battery modules can reduce the temperature interference between the sheet battery modules, so that each sheet battery module can be in the same temperature range, thereby improving the service life of the battery module.

[0039] The manufacturing method, battery module, and battery module of the present invention can be applied to occasions with limited assembly space, such as tablets. When a single first soft-pack battery cell 200 or second soft-pack battery cell 300 is damaged and an internal short circuit occurs, the spread speed and range of thermal runaway can be reduced, thereby ensuring the safety of the power system.

[0040] Furthermore, the method for manufacturing a multi-layer battery module of the present invention further includes the following steps: Step 3: Installing cooling or heating pipes within the flow-guiding gap 600, wherein the flowing medium within the pipes is gas or liquid. Depending on the application and requirements, the pipes can be used for heating or cooling, ensuring that the multiple sheet-shaped battery modules are within the same temperature range, while also preventing the temperature states of the multiple sheet-shaped battery modules from interfering with each other.

[0041] Specifically, when processing and manufacturing the sheet battery module, in step S2, before installing the first soft-pack battery cell 200 and the second soft-pack battery cell 300, a fixing hole 410 is punched on the pole ear 400 of the first soft-pack battery cell 200 and the second soft-pack battery cell 300. When installing the first soft-pack battery cell 200 and the second soft-pack battery cell 300, the fixing hole 410 on the pole ear 400 of the first soft-pack battery cell 200 is aligned with the fixing hole 410 on the pole ear 400 of the second soft-pack battery cell 300 to facilitate fixing the first soft-pack battery cell 200 and the second soft-pack battery cell 300, and at the same time facilitate subsequent electrical connection operations. Of course, it is also necessary to pre-punch through holes for subsequent fixation at corresponding positions on the first sheet shell 100 and the second sheet shell 500. Furthermore, after step S3, the following steps are also included: the current lead-out body 700 is inserted into the fixing hole 410 on the pole tab 400 of the first soft-pack battery cell 200 and the fixing hole 410 on the pole tab 400 of the second soft-pack battery cell 300, and the two ends of the current lead-out body 700 extend out of the first sheet shell 100 and the second sheet shell 500 respectively, so as to facilitate parallel connection of multiple sheet battery modules. Specifically, the current lead-out body 700 can be made of fuse-like material.

[0042] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0043] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0044] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0045] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. A method for manufacturing a sheet battery module, characterized in that: The steps include: S1. Providing a first sheet-shaped housing (100), and installing a first insulating gasket (110) in the first sheet-shaped housing (100); S2. providing a plurality of first soft-packed battery cells (200) and a second soft-packed battery cell (300), installing the plurality of first soft-packed battery cells (200) side by side on the upper portion of the first sheet-shaped shell (100), with the tabs (400) of the first soft-packed battery cells (200) facing downward, installing the plurality of second soft-packed battery cells (300) side by side on the lower portion of the first sheet-shaped shell (100), with the tabs (400) of the second soft-packed battery cells (300) facing upward, and electrically connecting the positive / negative poles of the first soft-packed battery cells (200) to the negative / positive poles of the adjacent second soft-packed battery cells (300); S3. Provide a second sheet shell (500), install a second insulating gasket (510) in the second sheet shell (500), and snap-fit ​​the second sheet shell (500) onto the first sheet shell (100), while positioning the tab (400) of the first soft-pack battery cell (200) and the tab (400) of the second soft-pack battery cell (300) between the first insulating gasket (110) and the second insulating gasket (510), wherein both the first sheet shell (100) and the second sheet shell (500) are made of aluminum.

2. The method for manufacturing a sheet battery module according to claim 1, wherein: In step S2, conductive structural adhesive is applied to the soft-package surfaces of the first soft-package battery cell (200) and the second soft-package battery cell (300), and the soft-package surfaces of the first soft-package battery cell and the second soft-package battery cell (300) are tightly fixed in the first sheet-shaped shell (100).

3. The method for manufacturing a sheet battery module according to claim 2, wherein: In step S2, after the conductive structural adhesive is solidified, the first soft-pack battery cell (200) and the second soft-pack battery cell (300) are welded and fixed.

4. The method for manufacturing a sheet battery module according to claim 1, wherein: In step S3, the sampling glue is used to securely connect the first sheet-shaped shell (100) and the second sheet-shaped shell (500).

5. The method for manufacturing a sheet-shaped battery module according to claim 1, wherein: The number of the first soft-pack battery cells (200) and the number of the second soft-pack battery cells (300) are not equal.

6. A method for manufacturing a multi-layer battery module, characterized in that: The steps include: Step 1: using the method for manufacturing a sheet battery module according to any one of claims 1 to 5 to manufacture a plurality of sheet battery modules; Step 2: Connect multiple sheet-shaped battery modules in parallel, and there is a flow-conducting gap (600) between every two adjacent sheet-shaped battery modules.

7. The method for manufacturing a multi-layer battery module according to claim 6, wherein: The following steps are also included: Step 3: Install a pipeline for cooling or heating in the guide gap (600), wherein the flow medium in the pipeline is gas or liquid.

8. The method for manufacturing a multi-layer battery module according to claim 6, wherein: In the step S2, before installing the first soft-pack battery cell (200) and the second soft-pack battery cell (300), fixing holes (410) are punched on the tabs (400) of the first soft-pack battery cell (200) and the second soft-pack battery cell (300); when installing the first soft-pack battery cell (200) and the second soft-pack battery cell (300), the fixing holes (410) on the tabs (400) of the first soft-pack battery cell (200) are aligned with the fixing holes (410) on the tabs (400) of the second soft-pack battery cell (300).

9. The method for manufacturing a multi-layer battery module according to claim 8, wherein: After step S3, the method further includes the following steps: inserting a current lead-out body (700) into the fixing hole (410) on the tab (400) of the first soft-pack battery cell (200) and the fixing hole (410) on the tab (400) of the second soft-pack battery cell (300), and the two ends of the current lead-out body (700) extend out of the first sheet shell (100) and the second sheet shell (500), respectively.

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