Method for assembling a battery pack and battery pack

Abstract

The application provides a battery pack assembly method and a battery pack. The battery pack includes a positive electrode and a negative electrode. The battery pack assembly method includes connecting a first module to the positive electrode and connecting a second module to the negative electrode. A discharge resistor is connected between the first module and the second module to discharge. After the discharge resistor completes discharging, the first module is connected to the second module. Abnormal surge can be prevented from damaging a battery monitoring unit.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a method for assembling a battery pack and the battery pack itself. Background Technology

[0002] With the development of science and technology, new energy vehicles have gradually become more popular. Among them, electric vehicles, as a representative of new energy vehicles, use batteries as their power source.

[0003] Currently, many high-capacity batteries require a certain number of modules connected in series. When two battery modules are connected, they form a circuit. At the moment of connection, a large surge is generated at the connection point. This surge can impact the battery monitoring units of both modules, causing damage to their peripheral circuits and even chips, resulting in a high risk of damage. Summary of the Invention

[0004] This application provides a method for assembling a battery pack and a battery pack to prevent damage to the battery monitoring unit.

[0005] In a first aspect, this application provides a method for assembling a battery pack, the battery pack including a positive electrode and a negative electrode; wherein, the method for assembling the battery pack includes:

[0006] The positive terminal is connected to the first module, and the negative terminal is connected to the second module;

[0007] A discharge resistor is connected between the first module and the second module to perform discharge;

[0008] After the discharge resistor has finished discharging, the first module is connected to the second module.

[0009] Furthermore, after the discharge resistor has completed discharging, it includes:

[0010] The real-time voltage between the first module and the second module is detected; when the real-time voltage is less than or equal to a set voltage value, it is determined that the discharge resistor has completed discharging.

[0011] Furthermore, the range of the set voltage value is less than or equal to 10V.

[0012] Furthermore, the resistance value of the discharge resistor is in the range of 1kΩ to 500kΩ.

[0013] Furthermore, after the discharge resistor has completed discharging, it includes:

[0014] After connecting a discharge resistor between the first module and the second module, timing begins; when the timing time is greater than or equal to a set time, it is determined that the discharge resistor has completed discharging; wherein, the set time is set according to the resistance value of the discharge resistor.

[0015] Further, the first module includes at least one first sub-module, and the second module includes at least one second sub-module; the step of connecting the first module to the positive terminal and the second module to the negative terminal includes:

[0016] At least one of the first sub-modules is connected in series with the positive electrode, and at least one of the second sub-modules is connected in series with the negative electrode.

[0017] Further, the step of connecting a discharge resistor between the first module and the second module for discharge includes:

[0018] The first connection module is designated as one of the at least one first sub-modules that is not connected between the positive electrode and another first sub-module, and is not connected between the other two first sub-modules.

[0019] The one of at least one second sub-module that is not connected between the negative electrode and another second sub-module, and is not connected between the other two second sub-modules, is designated as the second connection module;

[0020] The discharge resistor is connected between the first connection module and the second connection module.

[0021] Further, after the discharge resistor completes its discharge, connecting the first module and the second module includes:

[0022] After the discharge resistor completes its discharge, it connects the first connection module and the second connection module.

[0023] Furthermore, the number of the first sub-modules is greater than one, and the first sub-module is connected to the other first sub-module that is closest in location; and / or

[0024] When the positive electrode is connected to the first sub-module, at least one of the first sub-modules remains unconnected to another first sub-module; and / or

[0025] The number of the second sub-modules is greater than one, and the second sub-module is connected to the other second sub-module that is closest in location; and / or

[0026] When the negative electrode is connected to the second sub-module, at least one second sub-module remains unconnected to another second sub-module.

[0027] This application provides a battery pack obtained according to the battery pack assembly method described in any of the above embodiments.

[0028] The battery pack assembly method provided in this application involves connecting a discharge resistor between a first module and a second module for discharge. After the discharge resistor has completed discharging, the first module and the second module are connected. The discharge resistor can be used to reduce and discharge abnormal surges generated between the first and second modules. This reduces the risk of damage to the battery monitoring unit and lowers production losses.

[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0031] Figure 1 The diagram shown is a flowchart of a battery pack assembly method according to an exemplary embodiment of this application;

[0032] Figure 2 The image shown is a plan view of a battery pack according to an exemplary embodiment of this application;

[0033] Figures 3 to 4 The diagram shown is a schematic representation of the assembly process of a battery pack according to an exemplary embodiment of this application.

[0034] Figure 5 The diagram shown is a sub-flowchart of a battery pack assembly method according to an exemplary embodiment of this application. Detailed Implementation

[0035] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0036] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. "A plurality" or "several" indicates two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and / or "upper," etc., are for ease of description only and are not limited to a location or spatial orientation. The terms "comprising" or "including," etc., mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms "connected," "linked," etc., are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect.

[0037] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0038] This application provides a method for assembling a battery pack and the battery pack itself. The assembly method and battery pack of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features in the following embodiments and implementations can be combined with each other.

[0039] See Figure 1 , Figure 2 and Figure 3 As shown, this application provides a method for assembling a battery pack 10, which includes a positive electrode and a negative electrode. The method for assembling the battery pack 10 includes steps S101 to S103.

[0040] In step S101, the first module 11 is connected to the positive terminal, and the second module 12 is connected to the negative terminal. The battery pack 10 may include multiple modules. At least one module can be arbitrarily selected from the multiple modules and connected to the positive terminal as the first module 11, and at least one module can be arbitrarily selected from the multiple modules and connected to the negative terminal as the second module 12. The first module 11 can be connected to the positive terminal first, or the second module 12 can be connected to the negative terminal first; this application is not limited to this. In some embodiments, the battery pack 10 includes a battery pack body 14, which has a positive terminal and a negative terminal. The first module 11 and the second module 12 can be assembled within the battery pack body 14. The first module 11 can be connected to the positive terminal of the battery pack body 14, or the second module 12 can be connected to the negative terminal of the battery pack body 14.

[0041] In step S102, a discharge resistor 15 is connected between the first module 11 and the second module 12 for discharge. The discharge resistor 15 can be connected in series between the first module 11 and the second module 12 for discharge. Specifically, the discharge resistor 15 can be electrically connected between the remaining positive terminal of the first module 11 (connected to the positive terminal) and the remaining negative terminal of the second module 12 (connected to the negative terminal). Fixing clips can be provided at both ends of the discharge resistor 15, allowing it to be electrically connected between the first module 11 and the second module 12. The fixing clips facilitate the fixing and removal of the discharge resistor 15. The discharge resistor 15 can release surges generated after the first module 11 and the second module 12 are connected. In some embodiments, the resistance value of the discharge resistor 15 can range from 1kΩ to 500kΩ. In this embodiment, the resistance value of the discharge resistor 15 can be 100kΩ. This ensures sufficient discharge, prevents abnormal surges from damaging the peripheral circuits and chips of the battery monitoring unit, and allows for faster discharge, thereby ensuring the working efficiency of the production line.

[0042] In step S103, after the discharge resistor 15 has finished discharging, the first module 11 and the second module 12 are connected. Thus, after discharging through the discharge resistor 15, the remaining positive terminal of the first module 11 and the remaining negative terminal of the second module 12 can be electrically connected to form a circuit between the negative terminal, the positive terminal, the first module 11 and the second module 12.

[0043] The battery pack 10 assembly method provided in this application involves connecting a discharge resistor 15 between the first module 11 and the second module 12 for discharge. After the discharge resistor 15 has completed discharging, the first module 11 and the second module 12 are connected. The discharge resistor 15 can be used to weaken and discharge abnormal surges generated between the first module 11 and the second module 12. This can prevent abnormal surge impacts from damaging the peripheral circuits and chips of the battery monitoring unit of the first module 11 and the second module 12 at the moment of connection; or it can prevent abnormal surge impacts from damaging the battery monitoring units of the first module 11 and the second module 12 when the battery monitoring unit is externally connected. Or it can prevent abnormal surge impacts from damaging the first module 11 and the second module 12 when the battery monitoring unit is soldered onto the battery cell. This reduces the risk of damage to the battery monitoring unit and reduces production losses.

[0044] See Figure 4 As shown, in some embodiments, after the discharge resistor 15 completes its discharge, the following steps are performed: detecting the real-time voltage between the first module 11 and the second module 12. A multimeter 19 can be connected between the first module 11 and the second module 12 to detect the real-time voltage between them. When the real-time voltage is less than or equal to a set voltage value, it is determined that the discharge resistor 15 has completed its discharge. At this time, the first module 11 and the second module 12 can be connected. In some embodiments, the multimeter 19 and the discharge resistor 15 can be integrated and housed in a housing. The multimeter 19 and the discharge resistor 15 are connected in parallel within the housing, facilitating their portability and use. This allows the timing of connecting the first module 11 and the second module 12 to be determined by the voltage, ensuring that the first module 11 and the second module 12 can be connected immediately after the abnormal surge has been released, thus improving work efficiency. In some embodiments, the set voltage value is less than or equal to 10V. In this embodiment, when the detected real-time voltage is less than or equal to 10V, it is determined that the discharge resistor 15 has completed its discharge. Alternatively, the discharge resistor 15 can be removed after connecting the first module 11 and the second module 12. It can also be removed after confirming that the discharge resistor 15 has completed discharging.

[0045] In some other embodiments, after the discharge resistor 15 completes its discharge, the following steps are taken: timing begins after connecting the discharge resistor 15 between the first module 11 and the second module 12. A timer can be used for timing. When the timing is greater than or equal to a set time, it is determined that the discharge resistor 15 has completed its discharge. At this time, the first module 11 and the second module 12 can be connected. In this way, the timing of connecting the first module 11 and the second module 12 can be determined by the timing, ensuring that the first module 11 and the second module 12 can be connected immediately after the abnormal surge is released, thus improving work efficiency. The set time is set according to the resistance value of the discharge resistor 15. The larger the resistance value of the discharge resistor 15, the longer the set time can be, thus ensuring sufficient discharge. The set time can be between 1.83ms and 1s. When the resistance value of the discharge resistor 15 is 1kΩ, the set time can be 1.83ms; when the resistance value of the discharge resistor 15 is 500kΩ, the set time can be 1s. In this embodiment, the set time is 200ms.

[0046] See Figures 1 to 4As shown, in some embodiments, the first module 11 includes at least one first sub-module 16, and the second module 12 includes at least one second sub-module 17. The number of first sub-modules 16 can be one or more, and the number of second sub-modules 17 can be one or more. The sum of the number of first sub-modules 16 and second sub-modules 17 can be equal to the total number of modules installed in the battery pack 14. Connecting the first module 11 to the positive terminal and the second module 12 to the negative terminal includes: connecting at least one first sub-module 16 in series with the positive terminal and connecting at least one second sub-module 17 in series with the negative terminal. It is possible to first connect at least one first sub-module 16 in series with the positive terminal, and then connect at least one second sub-module 17 in series with the negative terminal. Alternatively, at least one second sub-module 17 can be connected in series with the negative terminal first; this application is not limited to this. Optionally, the first sub-module 16 and the positive terminal can be connected in series via a connector 18, and then at least one first sub-module 16 can be connected in series with the positive terminal. The second sub-module 17 and the negative electrode can be connected in series via connector 18. Two first sub-modules 16 can be connected in series via connector 18. Two second sub-modules 17 can be connected in series via connector 18. Connector 18 can be a copper busbar. A copper busbar can be overlapped between two first sub-modules 16, and then bolted to each of the two first sub-modules 16 to connect them. Similarly, a copper busbar can be overlapped between two second sub-modules 17, and then bolted to each of the two second sub-modules 17 to connect them. In some embodiments, when the number of first sub-modules 16 is greater than one, when the positive electrode is connected to a first sub-module 16, at least one remaining first sub-module 16 is not yet connected to another first sub-module 16. This can mean first connecting the positive electrode to a first sub-module 16, and then connecting any two first sub-modules 16. It can also mean connecting any two first sub-modules 16 firstly, and then connecting the positive electrode to the first sub-module 16; this application is not limited to this. In some embodiments, the first sub-module 16 is connected to the other first sub-module 16 that is closest in location. This allows connecting two first sub-modules 16 that are close in location, making the connector 18 connecting the two first sub-modules 16 shorter and facilitating the arrangement of the internal connectors 18. In some embodiments, when the number of second sub-modules 17 is greater than one, when the negative electrode is connected to the second sub-module 17, at least one second sub-module 17 remains unconnected to another second sub-module 17. It can also mean connecting the negative electrode to the second sub-module 17 firstly, and then connecting any two second sub-modules 17. It can also mean connecting any two second sub-modules 17 firstly, and then connecting the negative electrode to the second sub-module 17; this application is not limited to this. In some embodiments, the second sub-module 17 is connected to the other second sub-module 17 that is closest in location. This allows the connector 18 connecting the two second sub-modules 17 to be set shorter, which facilitates the arrangement of the internal connectors 18.In this way, at least one first sub-module 16 and at least one second sub-module 17 can be connected in a disordered manner, which improves production efficiency and avoids discharge phenomena such as arcing and burning, thus ensuring the safety of employees.

[0047] In such Figure 1 In the illustrated embodiment, the battery pack 10 may include six modules. Three first sub-modules 16 can be arbitrarily selected from the six modules as the first module 11. The remaining three second sub-modules 17 are used as the second module 12. In some other embodiments, two first sub-modules 16 can be arbitrarily selected from the six modules as the first module 11. The remaining four second sub-modules 17 are used as the second module 12. Alternatively, one first sub-module 16 can be arbitrarily selected from the six modules as the first module 11. The remaining five second sub-modules 17 are used as the second module 12. Alternatively, three second sub-modules 17 can be arbitrarily selected from the six modules as the second module 12. The remaining three first sub-modules 16 are used as the first module 11. Alternatively, two second sub-modules 17 can be arbitrarily selected from the six modules as the second module 12. The remaining four first sub-modules 16 are used as the first module 11. Alternatively, one second sub-module 17 can be arbitrarily selected from the six modules as the second module 12. Any five remaining first sub-modules 16 are used as first module 11. This application does not limit the specific implementation method.

[0048] See Figure 5 As shown, in some embodiments, a discharge resistor 15 is connected between the first module 11 and the second module 12 for discharge, including steps S201 to S203:

[0049] In step S201, the first connection module 21 is designated as one of the at least one first sub-module 16 that is not connected between the positive electrode and another first sub-module 16, and is not connected between the other two first sub-modules 16. The first connection module 21 has a remaining positive electrode that can be connected.

[0050] In step S202, one of the at least two second sub-modules 17 that is not connected between the negative electrode and another second sub-module 17, and is not connected between the other two second sub-modules 17, is marked as the second connection module 22; wherein the second connection module 22 has a negative electrode that can be connected.

[0051] In step S203, a discharge resistor 15 is connected between the first connection module 21 and the second connection module 22. Specifically, the discharge resistor 15 can be connected between the remaining positive terminal of the first connection module 21 and the remaining negative terminal of the second connection module 22. This releases the surge generated after the first connection module 21 and the second connection module 22 are connected.

[0052] In some embodiments, after the discharge resistor 15 has completed discharging, connecting the first module 11 and the second module 12 includes: connecting the first connection module 21 and the second connection module 22 after the discharge resistor 15 has completed discharging. The remaining positive terminal of the first connection module 21 and the remaining negative terminal of the second connection module 22 can be connected. The first connection module 21 and the second connection module 22 can be connected via a connector 18.

[0053] This application provides a battery pack 10, obtained according to the assembly method of the battery pack 10 described above.

[0054] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0055] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for assembling a battery pack, the battery pack comprising a positive electrode and a negative electrode; characterized in that; The battery pack assembly method includes: The positive terminal is connected to the first module, and the negative terminal is connected to the second module; A discharge resistor is connected between the first module and the second module to perform discharge; The first module includes at least one first sub-module, and the second module includes at least one second sub-module; the step of connecting a discharge resistor between the first module and the second module for discharge includes: At least one of the first sub-modules that is not connected between the positive electrode and another first sub-module, and is not connected between the other two first sub-modules, is designated as the first connection module; the first connection module has a remaining positive electrode that can be connected; The one of at least one second sub-module that is not connected between the negative terminal and another second sub-module, and is not connected between the other two second sub-modules, is designated as the second connection module; the second connection module has a remaining negative terminal that can be powered. The discharge resistor is connected between the remaining positive terminal of the first connection module and the remaining negative terminal of the second connection module; After the discharge resistor has finished discharging, the first module is connected to the second module.

2. The battery pack assembly method according to claim 1, characterized in that, After the discharge resistor has completed discharging, it includes: The real-time voltage between the first module and the second module is detected; when the real-time voltage is less than or equal to a set voltage value, it is determined that the discharge resistor has completed discharging.

3. The battery pack assembly method according to claim 2, characterized in that, The set voltage value is in the range of less than or equal to 10V.

4. The battery pack assembly method according to claim 1, characterized in that, The resistance value of the discharge resistor is in the range of 1kΩ to 500kΩ.

5. The battery pack assembly method according to claim 4, characterized in that, After the discharge resistor has completed discharging, it includes: After connecting a discharge resistor between the first module and the second module, timing begins; when the timing time is greater than or equal to a set time, it is determined that the discharge resistor has completed discharging; wherein, the set time is set according to the resistance value of the discharge resistor.

6. The battery pack assembly method according to claim 1, characterized in that, The connection of the first module to the positive terminal and the connection of the second module to the negative terminal includes: At least one of the first sub-modules is connected in series with the positive electrode, and at least one of the second sub-modules is connected in series with the negative electrode.

7. The battery pack assembly method according to claim 6, characterized in that, After the discharge resistor completes its discharge, connecting the first module and the second module includes: After the discharge resistor completes its discharge, it connects the first connection module and the second connection module.

8. The method for assembling a battery pack according to claim 6, characterized in that, The number of the first sub-modules is greater than one, and the first sub-module is connected to the other first sub-module that is closest in location; and / or When the positive electrode is connected to the first sub-module, at least one of the first sub-modules remains unconnected to another first sub-module; and / or The number of the second sub-modules is greater than one, and the second sub-module is connected to the other second sub-module that is closest in location; and / or When the negative electrode is connected to the second sub-module, at least one second sub-module remains unconnected to another second sub-module.

9. A battery pack, characterized in that, The battery pack is obtained by the assembly method according to any one of claims 1-8.

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