A battery pack with a variable pre-charge resistance and a vehicle

Abstract

The application relates to a battery pack with a variable pre-charge resistor and a vehicle, wherein the battery pack with the variable pre-charge resistor comprises a battery module (10), a pre-charge circuit (20) and an access module (30), one end of the pre-charge circuit (20) is connected with the battery module (10), the other end of the pre-charge circuit (20) is used for connecting a capacitive load (40), the pre-charge circuit (20) comprises a resistor network (21), the resistor network (21) comprises a plurality of resistors; the access module (30) is connected with the resistor network (21) and is used for changing the connection mode between the resistors in the resistor network (21), so that the resistance value of the resistor network (21) in the pre-charge circuit (20) is changed, different capacitive loads (40) are adapted, and the applicability of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and vehicle with variable pre-charge resistance. Background Technology

[0002] With the advancement of energy conservation and emission reduction, new energy vehicles are also booming, and people's requirements for the performance and safety of new energy vehicles are getting higher and higher. Since there is a capacitive load at the load end of the battery pack, a pre-charge circuit is required to charge the capacitor at the moment the main relay closes, so as to avoid damage to electrical components by generating a large instantaneous current during connection. Utility Model Content

[0003] Currently, the resistance of the pre-charge resistor network connected in the pre-charge circuit is a fixed value, and the resistance value of the resistor network cannot be adjusted according to the usage requirements to adapt to capacitive loads of different sizes. Based on this, it is necessary to provide a battery pack and vehicle with variable pre-charge resistance to address the above-mentioned technical problems.

[0004] In a first aspect, embodiments of this application provide a battery pack with a variable pre-charge resistance, comprising:

[0005] Battery module;

[0006] A pre-charge circuit, one end of which is connected to the battery module, and the other end of which is used to connect to a capacitive load. The pre-charge circuit includes a resistor network, which includes multiple resistors.

[0007] An access module, connected to the resistor network, is used to change the connection method between the resistors in the resistor network, thereby changing the resistance value of the resistor network connected to the pre-charge circuit to adapt to different capacitive loads.

[0008] In one embodiment, the access module includes:

[0009] It includes multiple port groups, each of which is connected to a corresponding resistor. The access module is used to change the connection method between each of the port groups, thereby changing the connection method between each resistor in the resistor network, so that the multiple resistors are connected in series and / or in parallel.

[0010] In one embodiment, the port group includes:

[0011] First port group and second port group;

[0012] The access module also includes:

[0013] The first access module includes multiple first port groups, each of which is connected to a corresponding resistor.

[0014] The second access module is connected to the first access module and includes a plurality of second port groups corresponding to each of the first port groups. The second access module is used to change the connection method between each of the second port groups, thereby changing the connection method between each resistor in the resistor network, so that the plurality of resistors are connected in series and / or in parallel.

[0015] In one embodiment, the first access module is disposed inside the battery pack, and the second access module is disposed outside the battery pack.

[0016] In one embodiment, each of the first port groups includes a first port and a second port; the input terminal of each resistor is connected to the corresponding first port, and the output terminal of each resistor is connected to the corresponding second port;

[0017] Each of the second port groups includes a third port corresponding to each of the first ports, and a fourth port corresponding to each of the second ports;

[0018] Each of the first ports is electrically connected to the corresponding third port; each of the second ports is electrically connected to the corresponding fourth port.

[0019] In one embodiment, when the fourth port corresponding to the output terminal of one resistor in the resistor network is connected to the third port corresponding to the input terminal of another resistor, the one resistor and the other resistor are connected in series.

[0020] In one embodiment, when the third port corresponding to the input terminal of one resistor in the resistor network is connected to the third port corresponding to the input terminal of another resistor, and the fourth port corresponding to the output terminal of one resistor is connected to the fourth port corresponding to the output terminal of another resistor, then the one resistor and the other resistor are connected in parallel.

[0021] In one embodiment, the access module further includes a fifth port and a sixth port.

[0022] One end of the fifth port is connected to one end of the second access module, and the other end of the fifth port is connected to the pre-charge circuit;

[0023] One end of the sixth port is connected to the other end of the second access module, and the other end of the sixth port is connected to the pre-charge circuit.

[0024] In one embodiment, the second port groups are connected via jumpers.

[0025] In one embodiment, the pre-charge circuit further includes: a pre-charge relay, a main positive relay, a main negative relay, a high-voltage positive interface, and a high-voltage negative interface. The positive terminal of the battery module is connected in series with the main positive relay to the high-voltage positive interface; the negative terminal of the battery module is connected in series with the main negative relay to the high-voltage negative interface; one end of the pre-charge relay is connected to the main positive relay, and the other end of the pre-charge relay is connected to the access module. The high-voltage positive interface and the high-voltage negative interface are used to connect the capacitive load.

[0026] Secondly, embodiments of this application provide a vehicle including a battery pack with variable pre-charge resistance as described in the first aspect above.

[0027] The aforementioned variable pre-charge resistance battery pack and vehicle are connected to the resistor network via an access module, changing the connection method between the resistors in the resistor network, thereby changing the resistance value of the resistor network connected to the pre-charge circuit to adapt to different capacitive loads and improve the applicability of the battery pack.

[0028] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0030] Figure 1 This is a hardware structure block diagram of a battery pack with variable pre-charge resistance as an example.

[0031] Figure 2 This is a hardware structure block diagram of a battery pack with variable pre-charge resistance in another embodiment;

[0032] Figure 3 This is a circuit diagram of the resistor network and the access module in one embodiment;

[0033] Figure 4 This is a circuit diagram of the resistor network and access module in another embodiment;

[0034] Figure 5 yes Figure 4 Circuit diagram after connection to the precharge circuit;

[0035] Figure 6 This is a circuit diagram of a battery pack with a variable pre-charge resistance in another embodiment;

[0036] Figure 7In another embodiment, the resistor network includes a circuit diagram of three resistors and an access module;

[0037] Figure 8 This is a circuit diagram in the first embodiment showing how the access module changes the connection method between resistors in the resistor network;

[0038] Figure 9 This is a circuit diagram in the second embodiment of which the access module changes the connection method between resistors in the resistor network;

[0039] Figure 10 This is a circuit diagram in the third embodiment showing how the access module changes the connection method between resistors in the resistor network.

[0040] Figure 11 This is a circuit diagram in the fourth embodiment of which the access module changes the connection method between resistors in the resistor network;

[0041] Figure 12 This is a circuit diagram in the fifth embodiment showing how the access module changes the connection method between resistors in the resistor network;

[0042] Figure 13 This is a circuit diagram in the sixth embodiment showing how the access module changes the connection method between resistors in the resistor network.

[0043] 10. Battery module; 20. Precharge circuit; 21. Resistor network; 22. Fuse; 23. Precharge relay; 24. Main positive relay; 25. Main negative relay; 26. High voltage positive interface; 27. High voltage negative interface; 30. Access module; 301. Fifth port; 302. Sixth port; 31. First access module; 311. First port group; 3111. First port; 3112. Second port; 32. Second access module; 321. Second port group; 3211. Third port; 3212. Fourth port; 40. Capacitive load. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application. Furthermore, it is understood that although the efforts made in such a development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, modifications to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0045] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0046] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. When an element is referred to as being "located" on another element, it may be directly disposed on the other element or may have an intervening element. When an element is considered to be "disposed on" another element, it may be directly disposed on the other element or may have an intervening element present. When an element is considered to be "fixed to" another element, it may be directly fixed to the other element or may have an intervening element present. The terms "first," "second," "third," etc., used in this application are merely to distinguish similar objects and do not represent a specific order of objects. The terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0047] Please see Figure 1 This invention provides a variable pre-charge resistance battery pack, including a battery module 10, a pre-charge circuit 20, and an access module 30. One end of the pre-charge circuit 20 is connected to the battery module 10, and the other end is used to connect to a capacitive load 40. The pre-charge circuit 20 includes a resistor network 21, which comprises multiple resistors. The access module 30 is connected to the resistor network 21 and is used to change the connection method between the resistors in the resistor network 21, thereby changing the resistance value of the resistor network 21 connected to the pre-charge circuit 20 to adapt to different capacitive loads 40.

[0048] This invention changes the connection method between resistors in the resistor network 21 by using the access module 30. For example, multiple resistors can be connected in series, in parallel, or in a combination of series and parallel connections. This changes the resistance value of the resistor network 21 connected to the pre-charge circuit 20. Therefore, the resistance value of the resistor network 21 can be adjusted according to the usage requirements to adapt to the requirements of different capacitive loads 40, thus improving the applicability of the battery pack.

[0049] In one embodiment, such as Figure 3As shown, the access module 30 includes multiple port groups, each of which is connected to a corresponding resistor. The access module 30 is used to change the connection method between each port group, thereby changing the connection method between each resistor in the resistor network 21, so that multiple resistors are connected in series and / or in parallel.

[0050] In this embodiment, the access module 30 includes multiple port groups. Each resistor in the resistor network 21 is directly connected to the corresponding port group in the access module 30 through a wire. By changing the connection method between the port groups in the access module 30, the connection method between the resistors in the resistor network 21 is changed, so that multiple resistors are connected in series and / or in parallel.

[0051] Please see Figure 2 and Figure 4 In one embodiment, the access module 30 includes a first access module 31 and a second access module 32. The port groups include a first port group 311 and a second port group 321. The first access module 31 includes multiple first port groups 311, the number of which is the same as the number of resistors in the resistor network 21. Each first port group 311 is connected to a corresponding resistor. The second access module 32 is connected to the first access module 31. The second access module 32 includes multiple second port groups 321, the number of which is the same as the number of resistors / first port groups 311 in the resistor network 21. Each first port group 311 corresponds to a second port group 321. The connection between the second access module 32 and the first access module 31 is achieved by connecting each second port group 321 to its corresponding first port group 311. The second access module 32 changes the connection method between the second port groups 321, thereby changing the connection method between the resistors in the resistor network 21, allowing multiple resistors to be connected in series and / or in parallel.

[0052] In one embodiment, the second port groups 321 are connected via jumpers. It should be noted that the second port groups 321 can also be connected in other ways, such as via terminals or wires.

[0053] The first access module 31 is located inside the battery pack, and the second access module 32 is located outside the battery pack.

[0054] This invention simplifies the operation by placing the second access module 32 outside the battery pack, which facilitates changing the connection method between each second port group 321, thereby changing the connection method between each resistor in the resistor network 21.

[0055] like Figure 4As shown, the resistor network 21 includes N resistors. The first access module 31 is configured with N first port groups 311, and the second access module 32 is configured with N second port groups 321. Each resistor is connected to its corresponding first port group 311, and each first port group 311 is connected to its corresponding second port group 321, thereby enabling the connection between the first access module 31 and the second access module 32.

[0056] Continue reading Figure 4 In one embodiment, in the first access module 31, each first port group 311 includes a first port 3111 and a second port 3112; each resistor includes an input terminal AN and an output terminal BN, the input terminal AN of each resistor is connected to the corresponding first port 3111, and the output terminal BN of each resistor is connected to the corresponding second port 3112. Thus, each resistor in the resistor network 21 is connected to the corresponding port in the first access module 31.

[0057] Continue reading Figure 4 In the second access module 32, each second port group 321 includes a third port 3211 and a fourth port 3212; wherein the third port 3211 is the port corresponding to the first port 3111, and the fourth port 3212 is the port corresponding to the second port 3112. Each first port 3111 is electrically connected to its corresponding third port 3211, and each second port 3112 is electrically connected to its corresponding fourth port 3212, for example, via a wire. This achieves the connection between the first access module 31 and the second access module 32.

[0058] Please see Figure 5 In one embodiment, the access module 30 further includes a fifth port 301 and a sixth port 302. One end of the fifth port 301 is connected to one end of the second access module 32, and the other end of the fifth port 301 is connected to the pre-charge circuit 20. One end of the sixth port 302 is connected to the other end of the second access module 32, and the other end of the sixth port 302 is connected to the pre-charge circuit 20.

[0059] In this embodiment, the second access module 32 is connected to the pre-charge circuit 20 via the fifth port 301 and the sixth port 302, thereby connecting the resistor network 21 to the pre-charge circuit 20. The fifth port 301 and the sixth port 302 are located externally to the battery pack.

[0060] In one embodiment, please refer to Figure 6The precharge circuit 20 also includes a precharge relay 23, a main positive relay 24, a main negative relay 25, a high-voltage positive interface 26, and a high-voltage negative interface 27. The positive terminal of the battery module 10 is connected in series with the main positive relay 24 to the high-voltage positive interface 26; the negative terminal of the battery module 10 is connected in series with the main negative relay 25 to the high-voltage negative interface 27; one end of the precharge relay 23 is connected to the main positive relay 24, and the other end of the precharge relay 23 is connected to the access module 30. The high-voltage positive interface 26 and the high-voltage negative interface 27 are used to connect the capacitive load 40.

[0061] The pre-charge relay 23 controls the on / off state of the pre-charge circuit 20. The main positive relay connects the positive terminal of the battery module 10 to the load, and the main negative relay connects the negative terminal of the battery module 10, forming a complete circuit. During the pre-charge phase, the pre-charge relay 23 and the main negative relay 25 are closed, and current flows through the resistor network 21 to charge the capacitive load 40. After pre-charging is complete, the pre-charge relay 23 is opened, and the main positive relay 24 is closed, allowing the battery module 10 to directly supply power to the capacitive load 40.

[0062] Furthermore, such as Figure 6 As shown, the precharge circuit 20 also includes a fuse 22, which is connected in series between the positive terminal of the battery module 10 and the main positive relay 24. It is used to quickly blow the fuse when the current rises abnormally, isolate the fault, and protect the circuit.

[0063] In one embodiment, when the fourth port 3212 corresponding to the output terminal of one resistor in the resistor network 21 is connected to the third port 3211 corresponding to the input terminal of another resistor, then one resistor is connected in series with the other resistor.

[0064] In one embodiment, when the third port 3211 corresponding to one resistor input terminal in the resistor network 21 is connected to the third port 3211 corresponding to another resistor input terminal, and the fourth port 3212 corresponding to one resistor output terminal is connected to the fourth port 3212 corresponding to another resistor output terminal, then one resistor is connected in parallel with the other resistor.

[0065] For example, such as Figure 7 As shown, the resistor network 21 includes three resistors, namely resistor R1, resistor R2 and resistor R3. The input terminal of resistor R1 is A1 and the output terminal is B1; the input terminal of resistor R2 is A2 and the output terminal is B2; the input terminal of resistor R3 is A3 and the output terminal is B3.

[0066] Correspondingly, the first access module 31 is configured with three first port groups 311, each first port group 311 including a first port 3111 and a second port 3112. Therefore, the first access module 31 specifically includes port 1, port 2, port 3, port 4, port 5, and port 6. Specifically, the input terminal A1 of resistor R1 is connected to port 1, the output terminal B1 of resistor R1 is connected to port 2, the input terminal A2 of resistor R2 is connected to port 3, the output terminal B2 of resistor R2 is connected to port 4, the input terminal A3 of resistor R3 is connected to port 5, and the output terminal B3 of resistor R3 is connected to port 6.

[0067] Correspondingly, the second access module 32 is configured with three second port groups 321. Each second port group 321 includes a third port 3211 and a fourth port 3212. Therefore, the second port group 321 specifically includes port 1, port 2, port 3, port 4, port 5, and port 6, as well as a fifth port 301 and a sixth port 302. Specifically, the input terminal A1 of resistor R1 is connected to port 1, and the output terminal B1 of resistor R1 is connected to port 2. The input terminal A2 of resistor R2 is connected to port 3, and the output terminal B2 of resistor R2 is connected to port 4. The input terminal A3 of resistor R3 is connected to port 5, and the output terminal B3 of resistor R3 is connected to port 6.

[0068] The battery pack needs to be compatible with different capacitive loads 40 and cope with different vehicle environments. Therefore, the resistance value of the resistor network 21 connected to the pre-charge circuit 20 can be changed according to the capacitance value of the capacitive load 40.

[0069] For example, resistors R1, R2, and R3 all use a 100Ω resistance and 100W power rating. Depending on the connection method, they can be categorized as follows:

[0070] (1) Connecting only one resistor, the pre-charge circuit 20 is equivalent to connecting a resistor with a resistance of 100Ω and a power of 100W;

[0071] For example: Figure 6 and Figure 8 As shown, when only one resistor R1 is connected, it is only necessary to connect port 1 of the second access module 32 to the fifth port 301, and port 2 of the second access module 32 to the sixth port 302.

[0072] (2) Connect two resistors in series. The pre-charge circuit 20 is equivalent to connecting a resistor with a resistance R of 200Ω and a power of 200W.

[0073] For example: Figure 6 and Figure 9As shown, when connecting two resistors R1 and R2 in series, it is only necessary to connect ports 2 and 3 in the second access module 32, then connect port 1 to the fifth port 301, and connect port 4 to the sixth port 302.

[0074] (3) Connect three resistors in series. The pre-charge circuit 20 is equivalent to connecting a resistor with a resistance R of 300Ω and a power of 300W.

[0075] For example: Figure 6 and Figure 10 As shown, when connecting three resistors R1, R2, and R3 in series, it is only necessary to connect ports 2 and 3 in the second access module 32, connect ports 4 and 5, connect port 1 to the fifth port 301, and connect port 5 to the sixth port 302.

[0076] (4) Connect two parallel resistors. The pre-charge circuit 20 is equivalent to connecting a resistor with a resistance R of 50Ω and a power of 200W.

[0077] For example: Figure 6 and Figure 11 As shown, when connecting two parallel resistors R1 and R2, it is only necessary to connect ports 1 and 3 in the second access module 32 and then connect them to the fifth port 301, and connect ports 2 and 4 and then connect them to the sixth port 302. That is, ports 1, 3 and the fifth port 301 are connected to each other in pairs, and ports 2, 4 and the sixth port 302 are connected to each other in pairs.

[0078] (5) Connect three resistors in parallel. The pre-charge circuit 20 is equivalent to connecting a resistor R of approximately 34Ω and a power of 300W.

[0079] For example: Figure 6 and Figure 12 As shown, when connecting three parallel resistors R1, R2, and R3, it is only necessary to connect ports 1, 3, and 5 in the second access module 32 in pairs and then connect them to the fifth port 301, and connect ports 2, 4, and 6 in pairs and then connect them to the sixth port 302.

[0080] (6) Connecting resistor 1 in series and resistor 2 in parallel, the pre-charge circuit 20 is equivalent to connecting a resistor with a resistance R of 150Ω and a power of 200W.

[0081] For example: Figure 6 and Figure 13 As shown, when resistors R2 and R3 are connected in parallel and then connected to resistor R1, it is only necessary to connect port 2, port 3, and port 5 in the second access module 32 respectively, connect port 4 and port 6 and then connect them to the sixth port 302, and connect port 1 to the fifth port 301.

[0082] The ports can be connected to each other using jumpers, terminals, wires, etc.

[0083] It should be noted that the number of resistors in the resistor network 21 and the connection methods between the ports in the second access module 32 and the connection methods with the fifth port 301 and the sixth port 302 are only examples, and the embodiments of this application are not limited.

[0084] This utility model also provides a vehicle including a battery pack with variable pre-charge resistance as described in the above embodiments.

Claims

1. A battery pack with a variable pre-charge resistance, characterized by, include: Battery module (10); A pre-charge circuit (20) is provided, one end of which is connected to the battery module (10), and the other end of which is used to connect to a capacitive load (40). The pre-charge circuit (20) includes a resistor network (21), which includes a plurality of resistors. The access module (30) is connected to the resistor network (21) and is used to change the connection method between each resistor in the resistor network (21), thereby changing the resistance value of the resistor network (21) connected to the pre-charge circuit (20) to adapt to different capacitive loads (40).

2. The battery pack of claim 1, wherein, The access module (30) includes: It includes multiple port groups, each of which is connected to a corresponding resistor. The access module (30) is used to change the connection method between each of the port groups, thereby changing the connection method between each resistor in the resistor network (21), so that multiple resistors are connected in series and / or in parallel.

3. The battery pack of claim 2, wherein, The port group includes: First port group (311) and second port group (321); The access module (30) also includes: The first access module (31) includes a plurality of first port groups (311), each of the first port groups (311) being connected to a corresponding resistor; The second access module (32) is connected to the first access module (31) and includes a plurality of second port groups (321) corresponding to each of the first port groups (311). The second access module (32) is used to change the connection method between each of the second port groups (321), thereby changing the connection method between each resistor in the resistor network (21), so that the plurality of resistors are connected in series and / or in parallel.

4. The battery pack of claim 3, wherein, The first access module (31) is located inside the battery pack, and the second access module (32) is located outside the battery pack.

5. The battery pack of claim 3, wherein, Each of the first port groups (311) includes a first port (3111) and a second port (3112); the input terminal of each resistor is connected to the corresponding first port (3111), and the output terminal of each resistor is connected to the corresponding second port (3112); Each of the second port groups (321) includes a third port (3211) corresponding to each of the first ports (3111) and a fourth port (3212) corresponding to each of the second ports (3112). Each of the first ports (3111) is electrically connected to the corresponding third port (3211); each of the second ports (3112) is electrically connected to the corresponding fourth port (3212).

6. The battery pack according to claim 5, characterized in that, When the fourth port (3212) corresponding to the output terminal of one resistor in the resistor network (21) is connected to the third port (3211) corresponding to the input terminal of another resistor, then the one resistor and the other resistor are connected in series.

7. The battery pack according to claim 5, characterized in that, When the third port (3211) corresponding to one of the resistor input terminals in the resistor network (21) is connected to the third port (3211) corresponding to the other resistor input terminal, and the fourth port (3212) corresponding to one of the resistor output terminals is connected to the fourth port (3212) corresponding to the other resistor output terminal, then one of the resistors is connected in parallel with the other resistor.

8. The battery pack of claim 3, wherein, The access module (30) also includes a fifth port (301) and a sixth port (302). One end of the fifth port (301) is connected to one end of the second access module (32), and the other end of the fifth port (301) is connected to the precharge circuit (20); One end of the sixth port (302) is connected to the other end of the second access module (32), and the other end of the sixth port (302) is connected to the precharge circuit (20).

9. The battery pack according to claim 3, characterized in that, Each of the second port groups (321) is connected via a jumper.

10. The battery pack of claim 1, wherein, The precharge circuit (20) further includes: a precharge relay (23), a main positive relay (24), a main negative relay (25), a high-voltage positive interface (26), and a high-voltage negative interface (27). The positive terminal of the battery module (10) is connected in series with the main positive relay (24) to the high-voltage positive interface (26); the negative terminal of the battery module (10) is connected in series with the main negative relay (25) to the high-voltage negative interface (27); one end of the precharge relay (23) is connected to the main positive relay (24), and the other end of the precharge relay (23) is connected to the access module (30). The high-voltage positive interface (26) and the high-voltage negative interface (27) are used to connect the capacitive load (40).

11. A vehicle characterized by comprising: The battery pack includes the variable pre-charge resistance as described in any one of claims 1 to 10.

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