Battery pack series-parallel control circuit, battery system and vehicle

Abstract

The application relates to a battery pack string parallel control circuit, a battery system and a vehicle, wherein the battery pack string parallel control circuit comprises a control module, a first switch, a second switch, a third switch and a driving circuit; the control module is connected with the driving circuit and is used for sending a first control signal, a second control signal and a third control signal; the driving circuit is connected with the first switch, the second switch and the third switch respectively, is used for generating a first driving signal, a second driving signal and a third driving signal based on the first control signal, the second control signal and the third control signal, and sending the first driving signal to the first switch, the second driving signal to the second switch and the third driving signal to the third switch, so that the first switch and the third switch are mutually exclusive with the second switch, short circuit of the battery pack is avoided, and the safety of the circuit is improved.

Description

Technical Field

[0001] This application relates to the field of electronic circuits, and in particular to a series-parallel control circuit for a battery pack, a battery system, and a vehicle. Background Technology

[0002] In the vehicle's electronic and electrical architecture, since different electrical devices require power supply systems with different voltage platforms, two battery packs are connected in series and parallel to meet different power needs.

[0003] In related technologies, a control module sends a control signal to the switching circuit to make the two battery packs be in series or parallel. However, there is a risk that the control signal may cause a short circuit in the battery pack due to insufficient control logic. Utility Model Content

[0004] Therefore, it is necessary to provide a battery pack series-parallel control circuit, a battery system, and a vehicle to address the aforementioned technical problems.

[0005] In a first aspect, this utility model provides a battery pack series-parallel control circuit, the control circuit including a control module, a first switch, a second switch, a third switch, and a drive circuit;

[0006] The control module is connected to the drive circuit and is used to send a first control signal, a second control signal, and a third control signal.

[0007] The driving circuit is connected to the first switch, the second switch, and the third switch respectively, and is used to generate a first driving signal, a second driving signal, and a third driving signal based on the first control signal, the second control signal, and the third control signal, and send the first driving signal to the first switch, the second driving signal to the second switch, and the third driving signal to the third switch, so that the first switch and the third switch are mutually exclusive with the second switch respectively.

[0008] In one embodiment, the driving circuit includes a first driving sub-circuit.

[0009] The first driving sub-circuit is configured to receive the first control signal, the second control signal, and the third control signal, and perform a NOR operation on the first control signal and the third control signal to output a first logic signal; and perform an AND operation on the first logic signal and the second control signal to output a second driving signal.

[0010] In one embodiment, the first driving sub-circuit includes a NOR logic gate circuit and a first AND logic gate circuit;

[0011] The NOR logic gate circuit is used to receive the first control signal and the third control signal, perform NOR logic operation on the first control signal and the third control signal, and output the first logic signal.

[0012] The first AND logic gate circuit, connected to the NOR logic gate circuit, is used to receive the second control signal, perform an AND logic operation on the first logic signal and the second control signal, output a second drive signal, and send the second drive signal to the second switch.

[0013] In one embodiment, the driving circuit further includes a second driving sub-circuit.

[0014] The second driving sub-circuit is configured to receive the first control signal, the second control signal, and the third control signal; perform a NOT logic operation on the second control signal to output a second logic signal; perform an AND logic operation on the first control signal and the second logic signal to output a first driving signal and send the first driving signal to the first switch; and perform an AND logic operation on the third control signal and the second logic signal to output a third driving signal and send the third driving signal to the third switch.

[0015] In one embodiment, the second driving sub-circuit includes a NOT logic gate and a second AND logic gate.

[0016] The NOT logic gate circuit is used to receive the second control signal, perform a NOT logic operation on the second control signal, and output the second logic signal.

[0017] The second AND logic gate circuit, connected to the NOT logic gate circuit, is used to receive the first control signal and the third control signal, perform an AND logic operation on the first control signal and the second logic signal, output a first drive signal, and perform an AND logic operation on the third control signal and the second logic signal, output a third drive signal.

[0018] In one embodiment, the first switch, the second switch, and the third switch are all relays.

[0019] In one embodiment, the first switch, the second switch, and the third switch are all MOSFETs.

[0020] In a second aspect, embodiments of this application also provide a battery system, the battery system comprising a first battery pack, a second battery pack, and a series-parallel control circuit for the battery pack as described in the first aspect above;

[0021] One end of the first switch is connected to the negative terminal of the first battery pack, and the other end is connected to the negative terminal of the second battery pack;

[0022] One end of the second switch is connected to the positive terminal of the first battery pack, and the other end is connected to the negative terminal of the second battery pack;

[0023] One end of the third switch is connected to the positive terminal of the first battery pack, and the other end is connected to the positive terminal of the second battery pack.

[0024] In one embodiment, the battery system further includes a fourth switch and a fifth switch:

[0025] One end of the fourth switch is connected to the positive terminal of the first battery pack, one end of the second switch, and one end of the third switch; the other end of the fourth switch is connected to the first load.

[0026] One end of the fifth switch is connected to the positive terminal of the second battery pack and the other end of the third switch, and the other end of the fifth switch is connected to the second load.

[0027] Thirdly, embodiments of this application also provide a vehicle including the battery system described in the second aspect above.

[0028] This utility model provides a battery pack series-parallel control circuit, a battery system, and a vehicle. The battery pack series-parallel control circuit includes a control module, a first switch, a second switch, a third switch, and a drive circuit. The control module is connected to the drive circuit and is used to send a first control signal, a second control signal, and a third control signal. The drive circuit is connected to the first switch, the second switch, and the third switch respectively, and is used to generate a first drive signal, a second drive signal, and a third drive signal based on the first control signal, the second control signal, and the third control signal. The drive circuit then sends the first drive signal to the first switch, the second drive signal to the second switch, and the third drive signal to the third switch, so that the first switch and the third switch are mutually exclusive with the second switch, preventing short circuits in the battery pack and improving circuit safety.

[0029] 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

[0030] 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:

[0031] Figure 1 This is a structural block diagram of the battery pack series-parallel control circuit in one embodiment;

[0032] Figure 2 This is a schematic diagram of a battery pack connected in series and parallel for power supply in one embodiment;

[0033] Figure 3 This is a structural block diagram of the first driving sub-circuit in one embodiment;

[0034] Figure 4 This is a block diagram of the second driver sub-circuit in one embodiment.

[0035] Among them, 10 is the control module; 20 is the drive circuit; 21 is the NOR logic gate circuit; 22 is the first AND logic gate circuit; 23 is the NOT logic gate circuit; and 24 is the second AND logic gate circuit. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Please see Figure 1 This utility model provides a battery pack series-parallel control circuit, including a control module 10, a first switch K1, a second switch K2, a third switch K3, and a drive circuit 20.

[0040] The first switch K1, the second switch K2, and the third switch K3 form a series-parallel switching circuit for the battery pack. For example... Figure 2 The diagram illustrates a series-parallel power supply configuration for battery packs. For example, it includes 12V battery pack A and 12V battery pack B. When only a 12V load needs power, the two 12V battery packs are connected in parallel. The control module 10 sends a control signal to close the first switch K1 and the third switch K3, and open the second switch K2, so that battery pack A and battery pack B are in parallel. The power supply to the 12V load is controlled by the fourth switch K4. When both 12V and 24V loads need power, the two 12V batteries are connected in series. The 12V load is powered by the lower-end battery, and the 24V load is powered by the higher-end battery. The control module 10 sends a control signal to open the first switch K1 and the third switch K3, and close the second switch K2, so that battery pack A and battery pack B are in series. The power supply to the 12V load is controlled by the fourth switch K4, and the power supply to the 24V load is controlled by the fifth switch K5.

[0041] When the control signal sent by the control module 10 is abnormal, it may cause a short circuit in the battery pack. In the parallel state, if the second switch K2 is closed by mistake, both battery pack A and battery pack B will be short-circuited. In the series state, if the first switch K1 is closed by mistake, battery pack A will be short-circuited. If the third switch K3 is closed by mistake, battery pack B will be short-circuited.

[0042] The driving circuit of this invention is connected to the control module and is used to receive a first control signal MCU_K1 sent by the control module to the first switch K1, a second control signal MCU_K2 sent by the control module to the second switch K2, and a third control signal MCU_K3 sent by the control module to the third switch K3. Based on the received first, second, and third control signals, the driving circuit generates a first driving signal to drive the first switch, a second driving signal to drive the second switch, and a third driving signal to drive the third switch. It then sends the first driving signal to the first switch, the second driving signal to the second switch, and the third driving signal to the third switch, so that the first switch K1 and the third switch K3 are mutually exclusive with the second switch K2. That is, if either the first switch K1 or the third switch K3 is closed, the second switch K2 cannot be closed; and if the second switch K2 is closed, neither the first switch K1 nor the third switch K3 can be closed.

[0043] This invention effectively avoids the risk of battery pack short circuits caused by insufficient control logic in the control module by adding a drive circuit to the series-parallel control circuit of the battery pack, thereby improving circuit safety.

[0044] Specifically, the control module is an MCU unit.

[0045] In one embodiment, such as Figure 3 As shown, the driving circuit includes a first driving sub-circuit. The first driving sub-circuit is used to receive the first control signal MCU_K1, the second control signal MCU_K2, and the third control signal MCU_K3, and to perform a NOR logic operation on the first control signal MCU_K1 and the third control signal MCU_K3 to output a first logic signal; and to perform an AND logic operation on the first logic signal and the second control signal MCU_K2 to output a second driving signal.

[0046] The first driving sub-circuit of this invention realizes, under the parallel power demand of the battery pack, by receiving the first control signal, the second control signal, and the third control signal, outputting the second driving signal, and sending the second driving signal to the second switch K2. The first switch K1 receives the first control signal MCU_K1 sent by the control module, the second switch K2 receives the second driving signal output by the second driving signal, and the third switch K2 receives the third control signal MCU_K3 sent by the control module, so that the first switch K1 and the third switch K3 are mutually exclusive with the second switch K2, that is, if either the first switch K1 or the third switch K3 is closed, the second switch K2 cannot be closed.

[0047] like Figure 3As shown, the first driver sub-circuit includes a NOR logic gate 21 and a first AND logic gate 22.

[0048] The NOR logic gate circuit is used to receive the first control signal and the second control signal issued by the control module, perform NOR logic operation on the first control signal and the third control signal, and output a first logic signal; the first AND logic gate circuit is connected to the NOR logic gate circuit, and is used to receive the second control signal, perform AND logic operation on the first logic signal and the second control signal, output a second drive signal, and send the second drive signal to the second switch.

[0049] The specific principle is shown in Table 1. MCU_K1 is the first control signal of the first switch K1 output by the MCU, MCU_K2 is the second control signal of the second switch K2 output by the MCU, and MCU_K3 is the third control signal of the third switch K3 output by the MCU. When the control signal output by the MCU is 0, it indicates that the corresponding switch is open; when the control signal output by the MCU is 1, it indicates that the corresponding switch is closed.

[0050] The NOR logic gate circuit 21 is used to perform NOR logic processing on the first control signal MCU_K1 and the third control signal MCU_K3 to obtain the first logic signal X.

[0051] The first AND logic gate circuit 22 is used to perform AND logic processing on the first logic signal X and the second control signal MCU_K2 to obtain the second drive signal Y, which is the final control signal for the second switch K2.

[0052] The control signals for the first switch K1 and the third switch K3 remain unchanged, that is, the control signal for the first switch K1 is MCU_K1, and the control signal for the third switch K3 is MCU_K3.

[0053] Table 1

[0054]

[0055] In one embodiment, such as Figure 4As shown, the driving circuit further includes a second driving sub-circuit. The second driving sub-circuit is used to receive the first control signal MCU_K1, the second control signal MCU_K2, and the third control signal MCU_K3; perform a NOT logic operation on the second control signal MCU_K2 to output a second logic signal; perform an AND logic operation on the first control signal MCU_K1 and the second logic signal to output a first driving signal and send the first driving signal to the first switch; and perform an AND logic operation on the third control signal MCU_K3 and the second logic signal to output a third driving signal and send the third driving signal to the third switch.

[0056] The second drive sub-circuit of this invention, when the battery pack is in series with the power demand, receives the first control signal, the second control signal, and the third control signal, outputs a first drive signal and a third drive signal, and sends the first drive signal to the first switch K1 and the third drive signal to the third switch K3. The first switch K1 receives the first drive signal output by the second drive sub-circuit, the second switch K2 receives the second control signal MCU_K2 sent by the control module, and the third switch K2 receives the third drive signal output by the second drive sub-circuit. This makes the first switch K1 and the third switch K3 mutually exclusive with the second switch K2; that is, when the second switch K2 is closed, the first switch K1 and the third switch K3 cannot be closed.

[0057] In one embodiment, the second driving sub-circuit includes a NOT logic gate 23 and a second AND logic gate 24.

[0058] The NOT logic gate circuit is used to receive the second control signal, perform a NOT logic operation on the second control signal, and output a second logic signal; the second AND logic gate circuit is connected to the NOT logic gate circuit, and is used to receive the first control signal and the third control signal, perform an AND logic operation on the first control signal and the second logic signal, output a first drive signal, and perform an AND logic operation on the third control signal and the second logic signal, output a third drive signal.

[0059] The specific principle is shown in Table 2. MCU_K1 is the first control signal of the first switch K1 output by the MCU, MCU_K2 is the second control signal of the second switch K2 output by the MCU, and MCU_K3 is the third control signal of the third switch K3 output by the MCU. When the control signal output by the MCU is 0, it indicates that the corresponding switch is open; when the control signal output by the MCU is 1, it indicates that the corresponding switch is closed.

[0060] The NOT logic gate circuit 23 is used to perform a NOT logic operation on the second control signal MCU_K2 and output the second logic signal A.

[0061] The second AND logic gate 24 is used to perform an AND operation between the second logic signal A and the first control signal MCU_K1 or the third control signal MCU_K3, and output a drive signal B, which is the final control signal for the first switch K1 and the third switch K3. Specifically, the second AND logic gate 24 is used to perform an AND operation between the second logic signal A and the first control signal MCU_K1, and output a first drive signal, which is the final control signal for the first switch K1; the second AND logic gate 24 is also used to perform an AND operation between the second logic signal A and the third control signal MCU_K3, and output a third drive signal, which is the final control signal for the third switch K3.

[0062] The control signal for the second switch K3 remains unchanged, meaning the control signal for the second switch K2 is MCU_K2.

[0063] Table 2

[0064]

[0065] In one embodiment, the first switch, the second switch, and the third switch are all relays.

[0066] In one embodiment, the first switch, the second switch, and the third switch are all MOSFETs.

[0067] This application embodiment also provides a battery system, the battery system comprising a first battery pack, a second battery pack, and a series-parallel control circuit for the battery packs as described in any of the preceding claims; as follows: Figure 2 As shown, one end of the first switch is connected to the negative terminal of the first battery pack (battery pack A), and the other end is connected to the negative terminal of the second battery pack; one end of the second switch is connected to the positive terminal of the first battery pack, and the other end is connected to the negative terminal of the second battery pack (battery pack B); one end of the third switch is connected to the positive terminal of the first battery pack, and the other end is connected to the positive terminal of the second battery pack.

[0068] In one embodiment, such as Figure 2 As shown, the battery system further includes a fourth switch and a fifth switch: one end of the fourth switch is connected to the positive terminal of the first battery pack, one end of the second switch, and one end of the third switch, and the other end of the fourth switch is connected to the first load; one end of the fifth switch is connected to the positive terminal of the second battery pack, the other end of the third switch, and the other end of the fifth switch is connected to the second load.

[0069] In one embodiment, this application also provides a vehicle including a battery system as described in any of the preceding claims.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A series-parallel control circuit for a battery pack, characterized in that, The control circuit includes a control module, a first switch, a second switch, a third switch, and a drive circuit. The control module is connected to the drive circuit and is used to send a first control signal, a second control signal, and a third control signal. The driving circuit is connected to the first switch, the second switch, and the third switch respectively, and is used to generate a first driving signal, a second driving signal, and a third driving signal based on the first control signal, the second control signal, and the third control signal, and send the first driving signal to the first switch, the second driving signal to the second switch, and the third driving signal to the third switch, so that the first switch and the third switch are mutually exclusive with the second switch respectively.

2. The control circuit according to claim 1, characterized in that, The driving circuit includes a first driving sub-circuit. The first driving sub-circuit is configured to receive the first control signal, the second control signal, and the third control signal, and perform a NOR operation on the first control signal and the third control signal to output a first logic signal; and perform an AND operation on the first logic signal and the second control signal to output a second driving signal.

3. The control circuit according to claim 2, characterized in that, The first driver sub-circuit includes a NOR logic gate circuit and a first AND logic gate circuit; The NOR logic gate circuit is used to receive the first control signal and the third control signal, perform NOR logic operation on the first control signal and the third control signal, and output the first logic signal. The first AND logic gate circuit, connected to the NOR logic gate circuit, is used to receive the second control signal, perform an AND logic operation on the first logic signal and the second control signal, output a second drive signal, and send the second drive signal to the second switch.

4. The control circuit according to claim 2, characterized in that, The driving circuit also includes a second driving sub-circuit. The second driving sub-circuit is configured to receive the first control signal, the second control signal, and the third control signal; perform a NOT logic operation on the second control signal to output a second logic signal; perform an AND logic operation on the first control signal and the second logic signal to output a first driving signal and send the first driving signal to the first switch; and perform an AND logic operation on the third control signal and the second logic signal to output a third driving signal and send the third driving signal to the third switch.

5. The control circuit according to claim 4, characterized in that, The second driver sub-circuit includes a NOT logic gate circuit and a second AND logic gate circuit. The NOT logic gate circuit is used to receive the second control signal, perform a NOT logic operation on the second control signal, and output the second logic signal. The second AND logic gate circuit, connected to the NOT logic gate circuit, is used to receive the first control signal and the third control signal, perform an AND logic operation on the first control signal and the second logic signal, output a first drive signal, and perform an AND logic operation on the third control signal and the second logic signal, output a third drive signal.

6. The control circuit according to claim 1, characterized in that, The first switch, the second switch, and the third switch are all relays.

7. The control circuit according to claim 1, characterized in that, The first switch, the second switch, and the third switch are all MOSFETs.

8. A battery system, characterized in that, The battery system includes a first battery pack, a second battery pack, and a battery pack series-parallel control circuit as described in any one of claims 1-7; One end of the first switch is connected to the negative terminal of the first battery pack, and the other end is connected to the negative terminal of the second battery pack; One end of the second switch is connected to the positive terminal of the first battery pack, and the other end is connected to the negative terminal of the second battery pack; One end of the third switch is connected to the positive terminal of the first battery pack, and the other end is connected to the positive terminal of the second battery pack.

9. The battery system according to claim 8, characterized in that, The battery system also includes a fourth switch and a fifth switch: One end of the fourth switch is connected to the positive terminal of the first battery pack, one end of the second switch, and one end of the third switch; the other end of the fourth switch is connected to the first load. One end of the fifth switch is connected to the positive terminal of the second battery pack and the other end of the third switch, and the other end of the fifth switch is connected to the second load.

10. A vehicle, characterized in that, Includes the battery system as described in any one of claims 8-9.

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