Secondary battery module

Abstract

The utility model provides a secondary battery module which comprises the following components: a housing which is configured to be a cylindrical body with an opening at the upper end and is provided with separating components for separating the housing into a plurality of independent chambers; a plurality of core bodies, wherein each core body is respectively arranged in one corresponding independent cavity; the top cover assembly is used for sealing the opening of the shell and electrically connecting the plurality of core bodies, the top cover assembly integrally comprises a top cover plate, a plurality of positive pole assemblies, a plurality of negative pole assemblies and a plurality of composite pole assemblies, the positive pole assemblies are connected with the positive pole lugs of the first core body, and the negative pole assemblies are connected with the negative pole lugs of the second core body. The negative pole assembly is connected with the negative pole lug of the second core body, one end of the composite pole assembly is connected with the positive pole lug of the third core body, and the other end of the composite pole assembly is connected with the negative pole lug of the fourth core body. The secondary battery module disclosed by the utility model is higher in assembly efficiency, low in production cost and stable in performance.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a secondary battery module. Background Technology

[0002] In recent years, the rapid development of new energy vehicles and energy storage systems has driven higher requirements for battery module technology, demanding that battery module production have the characteristics of low cost, simple manufacturing process and easy standardization.

[0003] Currently, most battery modules are assembled by welding multiple cells together in series and parallel via busbars, which results in cumbersome manufacturing processes and significant space waste. To simplify the manufacturing process and reduce production costs, some existing technologies involve assembling all cells in series within the battery casing to form a complete battery module. However, these modules typically require welding multiple cells to their respective terminal components first, and then to a top cover assembly to form the module. This process involves two welding processes for the terminal components to form the module, complicating the assembly process and increasing the risk of poor welding between the terminal and top cover assemblies, thus affecting the overall performance of the battery module. Utility Model Content

[0004] To improve the electrical connection performance of battery modules and simplify the battery module assembly process, this utility model provides a secondary battery module, comprising: a housing, configured as a cylindrical body with an opening at the upper end, and provided with a partition component dividing the housing into multiple independent chambers; multiple cores, each core being disposed in a corresponding independent chamber, and each core having a positive electrode tab and a negative electrode tab near the upper opening; and a top cover assembly for closing the opening of the housing and electrically connecting the multiple cores, characterized in that the top cover assembly integrally includes a top cover plate, multiple positive electrode post assemblies, multiple negative electrode post assemblies, and multiple composite electrode post assemblies, wherein the positive electrode post assembly is connected to the positive electrode tab of a first core, the negative electrode post assembly is connected to the negative electrode tab of a second core, one end of the composite electrode post assembly is connected to the positive electrode tab of a third core, and the other end of the composite electrode post assembly is connected to the negative electrode tab of a fourth core.

[0005] Furthermore, the positive terminal assembly, the negative terminal assembly, and the composite terminal assembly are integrally formed with the top cover plate by injection molding.

[0006] Furthermore, the top cover plate is provided with a plurality of receiving holes to respectively accommodate the positive terminal assembly, the negative terminal assembly, and the composite terminal assembly, and the positive terminal assembly, the negative terminal assembly, and the composite terminal assembly are located in the receiving holes and the top of the terminal assembly is not higher than the top surface of the top cover plate.

[0007] Furthermore, the bottom surface of the top cover plate is provided with a plurality of spaced second grooves.

[0008] Furthermore, the top surface of the top cover plate includes a plurality of spaced-apart third grooves.

[0009] Furthermore, the top cover plate is also provided with a through hole that penetrates at least a portion of the top cover plate in the left-right direction, and a portion of the composite pole assembly passes through the through hole to electrically connect the second core and the third core.

[0010] Furthermore, the top surface of the top cover plate is also provided with a recessed portion, which accommodates the external connection portion connecting the negative electrode assembly to the external component.

[0011] Furthermore, the top cover plate is provided with multiple explosion-proof valve assemblies.

[0012] The beneficial effects of this utility model are: the assembly efficiency of the secondary battery module of this utility model is higher, the production cost of the secondary battery module can be reduced, and the electrical connection between the integrated top cover assembly formed by injection molding and each core is more stable. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the secondary battery module of this utility model;

[0014] Figure 2 This is an exploded view of the secondary battery module of this utility model;

[0015] Figure 3 This is a schematic diagram of the housing in the secondary battery module of this utility model;

[0016] Figure 4 This is a schematic diagram of the top cover assembly in the secondary battery module of this utility model;

[0017] Figure 5 This is an exploded view of the top cover assembly in the secondary battery module of this utility model;

[0018] Figure 6 This is a schematic diagram of the positive terminal post in the top cover assembly of the secondary battery module of this utility model;

[0019] Figure 7 This is a schematic diagram of the composite terminal in the top cover assembly of the secondary battery module of this utility model;

[0020] Figure 8 This is a front view of the top cover assembly in the secondary battery module of this utility model from a certain angle;

[0021] Figure 9 This is a bottom view of the top cover assembly in the secondary battery module of this utility model;

[0022] Figure 10 This is a top view of the top cover assembly in the secondary battery module of this utility model;

[0023] Figure 11 for Figure 10 Cross-sectional view of section AA;

[0024] Figure 12 for Figure 10 Cross-sectional view of section BB;

[0025] Figure 13 for Figure 10 Cross-sectional view of the CC section. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Reference Figures 1-13 The secondary battery module 100 of this utility model includes a shell 10, a core 20, and a top cover assembly. For example... Figure 1 As shown, the shell 10 is constructed as a cylindrical body with an opening at the upper end, and can be formed as follows: Figure 3 The rectangular cylindrical body can also be configured in other shapes as needed, such as cylinders, polygonal prisms, etc. The housing 10 has multiple partition members 101 inside, which divide the interior of the housing 10 into multiple independent chambers 102. In this embodiment, the housing 10 has three partition members 101, dividing the interior of the housing 10 into four independent chambers 102. The number of partition members 101 can be set differently according to the needs of the battery module; for example, seven partition members can be set to divide the internal space of the housing into eight independent chambers.

[0028] The core 20 can be configured as a wound core or a stacked core, and is made of a positive electrode sheet, a negative electrode sheet, and a separator by winding or stacking. Each core 20 has an individual positive electrode tab and a negative electrode tab. Each core 20 is installed in an independent chamber 102. In this embodiment, the positive and negative electrode tabs of the core 20 are located at the opening at the upper end of the casing. The secondary battery module of this embodiment has four cores 20, each of which is located in a separate independent chamber 102. The cores 20 are separated by a separator 101 to prevent interference between them.

[0029] The top cover assembly 30 is used to close the opening at the upper end of the housing 10 and electrically connect multiple cores 20, thereby assembling the multiple cores 20 into a battery module through the top cover assembly 30. This module is used for electrical connection with external components to realize the charging and discharging function of the battery module. In this embodiment, the top cover assembly 30 integrally includes a top cover plate 304, multiple positive terminal post assemblies 50, multiple negative terminal post assemblies 60, and multiple composite terminal post assemblies 70. The positive terminal post assembly 50 includes a positive electrode tab connection portion and a positive external connection portion; the negative terminal post assembly 60 includes a negative electrode tab connection portion 602 and a negative external connection portion 601. In this embodiment, the positive terminal post assembly 50 and the negative terminal post assembly 60 have similar structures, but the materials may differ. The composite terminal post assembly 70 includes a positive electrode tab connection portion 701, a negative electrode tab connection portion 702, and a connection portion 703 connecting the positive electrode tab connection portion 701 and the negative electrode tab connection portion 702. Specifically, the tab connection portion of the positive electrode assembly 50 is connected to the positive electrode tab of the first core 201, the negative electrode tab connection portion 602 of the negative electrode assembly 60 is connected to the negative electrode tab of the second core 202, the positive electrode tab connection portion 701 of the composite electrode assembly 70 is connected to the positive electrode tab of the third core 203, and the negative electrode tab connection portion 702 of the composite electrode assembly 70 is connected to the negative electrode tab of the fourth core 204.

[0030] Specifically, the top cover plate 304 is roughly rectangular and made of plastic. The top cover plate 304 has multiple receiving holes 308 extending vertically through it. Each receiving hole 308 can accommodate a corresponding positive terminal assembly 50, negative terminal assembly 60, and composite terminal assembly 70. The receiving holes 308 are stepped holes, wider at the top and narrower at the bottom. When the positive terminal assembly 50, negative terminal assembly 60, and composite terminal assembly 70 are injection molded into their respective receiving holes 308, after each terminal assembly is injection molded, the top of each terminal assembly does not exceed the top surface of the top cover plate 304. This prevents any protrusions on the top of the top cover plate 304 from affecting the installation of other battery modules, thus improving the overall energy density of the battery module. In this embodiment, the top cover assembly 30 is connected in series with the positive electrode assembly 50, the negative electrode assembly 60, the composite electrode assembly 70, and the positive and negative electrode tabs of each of the multiple cores (201, 202, 203, 204) to form a battery module.

[0031] In this embodiment, the top surface of the top cover plate 304 includes multiple spaced third grooves 303 for positioning the external ultrasonic welding device, thereby placing the ultrasonic welding device near the third grooves 303. The depth of the third grooves 303 recessed from the top to the bottom surface is preferably set to 0.3mm-1mm. Setting the depth of the third grooves within this range not only serves to position the ultrasonic welding device but also ensures the strength of the top cover plate, preventing breakage at the third groove. The bottom surface of the top cover plate 304 is provided with multiple spaced second grooves 302. The second grooves recess from the bottom surface of the top cover plate towards the top surface, with a depth preferably set to 1mm-4mm. These are used to position the ultrasonic welding device from the bottom. Thus, when the electrode assembly in the top cover plate is welded to the core electrode tab, the combined action of the third and second grooves ensures that the ultrasonic welding is positioned vertically, preventing welding misalignment and accurately achieving the welding of the electrode tab and electrode post, ensuring smooth welding. Furthermore, the bottom of the top cover plate 304 is provided with multiple first protrusions 306 and second protrusions 307 protruding into the housing. The multiple first protrusions 306 are located at the first end of the top cover plate, and the multiple second protrusions 307 are located at the second end of the top cover plate. A first groove 301 is defined between the two first protrusions 306 at the first end and the top cover plate. The depth of the first groove is 10mm-20mm. The first groove 301 allows the welding device to enter the housing through the first groove 301 during the welding process. By providing multiple first grooves 301, multiple welding devices can enter, thereby simultaneously welding the tabs and terminal assemblies of multiple cores, improving the efficiency of ultrasonic welding, and thus further reducing the production cost of the secondary battery module.

[0032] The top surface of the top cover 304 is also provided with a recess 305, which is used to accommodate the negative terminal external connection part 601 that connects the negative terminal assembly 50 to the external component. The negative terminal assembly 60 includes a negative terminal external connection part 602 and a negative terminal tab connection part 601. The negative terminal external connection part 602 is constructed as a curved sheet-like part, which can be connected to the power supply of the battery module, thereby enabling the battery module to establish an electrical connection with the external power supply and realize the charging and discharging function of the battery module. The recess 305 ensures that the negative terminal external connection part 602 does not protrude from the top surface of the top cover, thereby improving the space utilization of the battery module.

[0033] The top cover plate 304 is also provided with a through hole penetrating at least a portion of the top cover plate in the left-right direction. The connecting shell of the composite pole assembly 70 passes through the through hole and is electrically connected to the second core and the third core. Multiple explosion-proof valve assemblies 40 are provided on the top cover plate 304. Each explosion-proof assembly 40 includes an explosion-proof mounting block, which has a waist-shaped groove and an injection hole. An explosion-proof valve is installed in the waist-shaped groove. The explosion-proof mounting block and the explosion-proof valve are integrally formed by nano-injection molding.

[0034] The secondary battery module of this utility model first installs each core 20 into its respective independent chamber 102, so that the positive and negative electrodes of each core are located at the opening end of the shell. Then, the top cover assembly is installed into the opening end of the shell, so that the top cover assembly closes the opening of the battery shell. When the top cover assembly is installed into the shell, the positive electrode post assembly is opposite to the positive electrode electrode, the negative electrode post assembly is opposite to the negative electrode electrode, and the composite electrode post assembly is opposite to the positive and negative electrode electrodes of the core respectively. Then, the positive electrode post assembly is ultrasonically welded to the positive electrode electrode, the negative electrode post assembly to the negative electrode electrode, and the composite electrode post to the positive and negative electrode electrodes through laser welding. During laser welding, the positive and negative electrodes of the ultrasonically pre-welded current collector are pressed into the positive current collector, the composite current collector, and the negative current collector in a certain order through the first groove, and then electrically connected by laser welding. The electrically connected top cover and current collector assembly are inserted into the shell and sealed by welding or glue application to form an assembled whole.

[0035] In summary, in this embodiment, the positive terminal assembly 50, negative terminal assembly 60, and composite terminal assembly 70 in the top cover assembly are integrally formed with the top cover plate 304 by injection molding. The top cover assembly integrating each terminal assembly can be simultaneously welded to multiple cores in the housing to form an electrical connection. Compared with the prior art structure in which each core is welded to the terminal assembly separately and then assembled with the top cover plate, the assembly efficiency of the battery top cover of this utility model is higher, the production cost of the secondary battery module can be reduced, and the electrical connection between the integral top cover assembly formed by injection molding and each core is more stable.

Claims

1. A secondary battery module, comprising: The shell is constructed as a cylindrical body with an opening at the top, and is provided with a partition component that divides the shell into multiple independent chambers; Multiple cores, each core is disposed in a corresponding independent chamber, and each core is provided with a positive electrode tab and a negative electrode tab near the opening; A top cover assembly for sealing the opening of the housing and electrically connecting the plurality of cores, characterized in that the top cover assembly integrally includes a top cover plate, a plurality of positive terminal post assemblies, a plurality of negative terminal post assemblies, and a plurality of composite terminal post assemblies; the positive terminal post assembly is connected to the positive terminal tab of a first core; the negative terminal post assembly is connected to the negative terminal tab of a second core; one end of the composite terminal post assembly is connected to the positive terminal tab of a third core; and the other end of the composite terminal post assembly is connected to the negative terminal tab of a fourth core.

2. The secondary battery module as described in claim 1, characterized in that, The positive electrode assembly, the negative electrode assembly, and the composite electrode assembly are integrally formed with the top cover plate by injection molding.

3. The secondary battery module as described in claim 2, characterized in that, The top cover plate is provided with a plurality of receiving holes to respectively accommodate the positive terminal assembly, the negative terminal assembly, and the composite terminal assembly, and the positive terminal assembly, the negative terminal assembly, and the composite terminal assembly are located in the receiving holes, and the top of the terminal assembly is not higher than the top surface of the top cover plate.

4. The secondary battery module as described in claim 1, characterized in that, The bottom surface of the top cover plate is provided with multiple spaced features. The second groove is placed.

5. The secondary battery module as described in claim 4, characterized in that, The top surface of the top cover plate includes multiple spaced-apart... The third groove is placed.

6. The secondary battery module as described in claim 1, characterized in that, The top cover plate is also provided with a through-beam in the left and right direction. A through-hole penetrating at least a portion of the top cover plate, through which a portion of the composite pole assembly is electrically connected to the second core and the third core.

7. The secondary battery module as described in claim 1, characterized in that, The top surface of the top cover plate is also provided with a recessed portion. The recessed portion accommodates the external connection portion that connects the negative electrode post assembly to the external component.

8. The secondary battery module as described in claim 1, characterized in that, The top cover plate is equipped with multiple explosion-proof valve assemblies.

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