High-voltage framework of battery pack

Abstract

The utility model belongs to the technical field of battery pack design, and discloses a high-voltage framework of a battery pack, which comprises a discharge high-voltage connector, a quick charge high-voltage connector, a first battery pack, a second battery pack, a first on-off device and a second on-off device, the negative electrode of the discharge high-voltage connector is connected with the negative electrode of the first battery pack and the other end of the first on-off device. The positive electrode of the quick-charging high-voltage connector is connected with the positive electrode of the first battery pack and one end of the second on-off device, and the negative electrode of the quick-charging high-voltage connector is connected with the negative electrode of the second battery pack and the other end of the second on-off device; and the first on-off device and the second on-off device are also connected with the battery management system. According to the circuit design mode, the quick charge loop and the discharge loop can be staggered, and a relatively long copper bar is avoided, so that the input cost is reduced, and meanwhile, the assembly efficiency of a production line is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery pack design, and in particular relates to a high-voltage structure of a battery pack. Background Art

[0002] With the continuous development of the new energy vehicle market, battery technology is also constantly innovating. Commonly used battery packaging technology can ignore the module level and improve the space utilization of the battery pack by integrating battery cells into the battery pack, so as to achieve the purpose of reducing weight and increasing cruising range.

[0003] In order to meet the charging and discharging needs of the battery pack, a discharge port and a charging port can generally be set at the front and rear ends of the battery pack respectively. The discharge port can be connected to a discharge high-voltage connector to discharge the electrical appliances on the vehicle end through the discharge high-voltage connector; the charging port can be connected to a fast-charging high-voltage connector to quickly charge through the fast-charging high-voltage connector. When designing the internal circuit of the battery pack, the long copper bar corresponding to the fast-charging circuit is usually placed on the long copper bar corresponding to the discharge circuit, or the long copper bar corresponding to the discharge circuit is placed on the long copper bar corresponding to the fast-charging circuit. Due to the high manufacturing cost of the copper bar, this method will increase the investment cost on the one hand, and the operation of fixing the long copper bar is more cumbersome, which can easily lead to an increase in the working hours of the production line; on the other hand, if the long copper bar corresponding to the fast-charging circuit and the long copper bar corresponding to the discharge circuit are not fixed properly, it is easy to cause the risk of long-term wear between the long copper bars, which will also cause leakage of the battery pack. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, such as the high manufacturing cost of copper bars, which increases the investment cost and the cumbersome operation of fixing the long copper bars, which easily leads to increased working hours on the production line; and the risk of long-term wear of the long copper bars corresponding to the fast charging circuit and the long copper bars corresponding to the discharge circuit if they are not properly fixed, which may further cause battery pack leakage, a high-voltage structure for the battery pack is proposed. The technical solution is as follows:

[0005] The utility model provides a high-voltage architecture of a battery pack, including a discharge high-voltage connector and a fast-charge high-voltage connector arranged outside the battery pack, and a first battery pack, a second battery pack, a first on-off device, and a second on-off device arranged inside the battery pack, wherein:

[0006] The positive electrode of the discharge high-voltage connector is respectively connected to the positive electrode of the second battery pack and one end of the first switching device, and the negative electrode of the discharge high-voltage connector is respectively connected to the negative electrode of the first battery pack and the other end of the first switching device;

[0007] The positive electrode of the fast-charging high-voltage connector is respectively connected to the positive electrode of the first battery pack and one end of the second on-off device, and the negative electrode of the fast-charging high-voltage connector is respectively connected to the negative electrode of the second battery pack and the other end of the second on-off device;

[0008] The first switching device and the second switching device are also connected to the battery management system.

[0009] In an optional solution, the first switching device includes a first relay and a first normally open contact corresponding to the first relay, wherein:

[0010] The first relay is connected to the battery management system;

[0011] One end of the first normally open contact is connected to the positive pole of the discharge high voltage connector and the positive pole of the second battery pack, and the other end of the first normally open contact is connected to the negative pole of the discharge high voltage connector and the negative pole of the first battery pack.

[0012] In yet another optional solution, the second switching device includes a second relay and a second normally open contact corresponding to the second relay, wherein:

[0013] The second relay is connected to the battery management system;

[0014] One end of the second normally open contact is respectively connected to the positive pole of the fast charging high-voltage connector and the positive pole of the first battery pack, and the other end of the second normally open contact is respectively connected to the negative pole of the fast charging high-voltage connector and the negative pole of the second battery pack.

[0015] In another optional solution, a fuse is further included, one end of the fuse is connected to one end of the first switching device and the positive electrode of the discharge high-voltage connector, and the other end of the fuse is connected to the positive electrode of the second battery pack.

[0016] In another optional solution, a third on-off device is further included, one end of the third on-off device is respectively connected to one end of the first on-off device and the positive pole of the discharge high-voltage connector, the other end of the third on-off device is connected to one end of the fuse, and the third on-off device is also connected to the battery management system.

[0017] In yet another optional solution, a pre-charging resistor and a fourth switching device are further included, wherein:

[0018] One end of the pre-charging resistor is connected to one end of the first switching device and the positive electrode of the discharge high-voltage connector, and the other end of the pre-charging resistor is connected to one end of the fourth switching device;

[0019] The other end of the fourth switching device is connected to one end of the fuse, and the fourth switching device is also connected to the battery management system.

[0020] In another optional solution, a first Hall sensor is further included, one end of the first Hall sensor is connected to the negative electrode of the discharge high-voltage connector, and the other end of the first Hall sensor is respectively connected to the negative electrode of the first battery pack and the other end of the first switching device.

[0021] In another optional scheme, a fifth on-off device is also included, one end of the fifth on-off device is respectively connected to the positive pole of the first battery pack and one end of the second on-off device, the other end of the fifth on-off device is connected to the positive pole of the fast charging high-voltage connector, and the fifth on-off device is also connected to the battery management system.

[0022] In another optional solution, a second Hall sensor is further included, one end of the second Hall sensor is respectively connected to the negative pole of the second battery pack and the other end of the second switching device, and the other end of the second Hall sensor is connected to the negative pole of the fast charging high-voltage connector.

[0023] In yet another alternative, the first battery pack includes two battery cells connected in series, and the second battery pack includes six battery cells connected in series.

[0024] Beneficial effects of the utility model:

[0025] By constructing a high-voltage architecture for a battery pack, including a discharge high-voltage connector and a fast-charge high-voltage connector arranged outside the battery pack, and a first battery pack, a second battery pack, a first on-off device, and a second on-off device arranged inside the battery pack, the positive pole of the discharge high-voltage connector is respectively connected to the positive pole of the second battery pack and one end of the first on-off device, and the negative pole of the discharge high-voltage connector is respectively connected to the negative pole of the first battery pack and the other end of the first on-off device; the positive pole of the fast-charge high-voltage connector is respectively connected to the positive pole of the first battery pack and one end of the second on-off device, and the negative pole of the fast-charge high-voltage connector is respectively connected to the negative pole of the second battery pack and the other end of the second on-off device; the first on-off device and the second on-off device are also connected to a battery management system. This circuit design method not only staggers the fast-charge circuit and the discharge circuit and avoids the existence of long copper bars, thereby reducing investment costs and improving the assembly efficiency of the production line, but also controls the on-off status of the first on-off device and the second on-off device through the battery management system to realize the charging and discharging process of the battery pack, thereby ensuring the overall safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A conventional battery pack architecture design rendering provided by an embodiment of the present utility model;

[0028] Figure 2 A rendering of a high-voltage architecture design for a battery pack provided by an embodiment of the present utility model;

[0029] Figure 3 This is a design rendering of a high-voltage architecture of another battery pack provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] In the following description, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The following description provides multiple embodiments of the present invention, and different embodiments can be replaced or combined, so the present invention can also be considered to include all possible combinations of the same and / or different embodiments described. Therefore, if one embodiment includes features A, B, and C, and another embodiment includes features B and D, then the present invention should also be considered to include embodiments containing one or more of all other possible combinations of A, B, C, and D, even though such embodiments may not be explicitly described in the following text.

[0032] The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made to the functions and arrangements of the elements described without departing from the scope of the present invention. Various examples may appropriately omit, replace, or add various processes or components. For example, the described method may be performed in an order different from the order described, and various steps may be added, omitted, or combined. Furthermore, features described in some examples may be combined in other examples.

[0033] See also Figure 1 , Figure 1 A conventional battery pack architecture design effect diagram provided by an embodiment of the present invention is shown.

[0034] like Figure 1As shown, in a conventional battery pack architecture design, the battery pack is placed inside the battery pack. The battery pack may include but is not limited to eight battery cells connected in series (the present invention is not limited to the number of battery cells contained in the battery pack). Each battery cell may be but is not limited to different types of batteries such as lithium-ion batteries or nickel-metal hydride batteries. In addition to the battery pack, the battery pack may also include but is not limited to battery management systems, thermal management systems, communication interfaces, fuses, relays and other parts well known in the art to ensure the normal execution of the charging process or the discharging process.

[0035] besides, Figure 1 The discharge high-voltage connector and the fast-charge high-voltage connector are respectively provided at both ends of the battery pack. The battery pack may be provided with a discharge port at one end close to the discharge high-voltage connector (the positive pole of the discharge port may be connected to the positive pole of the discharge high-voltage connector, and the negative pole of the discharge port may be connected to the negative pole of the discharge high-voltage connector, and Figure 1 The discharge port is not shown in the figure); the battery pack may also be provided with a charging port at one end close to the fast-charge high-voltage connector (the positive pole of the charging port can be connected to the positive pole of the fast-charge high-voltage connector, and the negative pole of the charging port can be connected to the negative pole of the fast-charge high-voltage connector, and Figure 1 The charging port is not shown in the figure. Here, the discharge high-voltage connector can also be connected to the vehicle-side electrical appliances to power the vehicle's electrical appliances when the battery pack is in the discharge process; the fast-charging high-voltage connector can also be connected to an external power source to charge the battery pack when the battery pack is in the charging process.

[0036] It is understandable that when the battery pack is in the discharge process, Figure 1 The positive pole of the battery cell at the lower left corner of the battery pack is connected to the positive pole of the discharge high-voltage connector, and the negative pole of the discharge high-voltage connector is connected to the negative pole of the battery cell at the upper left corner of the battery pack through long copper bars to form the discharge circuit of the battery pack; when the battery pack is in the charging process, the positive pole of the fast-charge high-voltage connector is connected to the positive pole of the battery cell at the lower left corner of the battery pack, and the negative pole of the battery cell at the upper left corner of the battery pack is connected to the negative pole of the fast-charge high-voltage connector through long copper bars to form the charging circuit of the battery pack. Figure 1 It can be seen that the long copper bar connected between the positive pole of the fast-charge high-voltage connector and the positive pole of the battery cell in the lower left corner of the battery pack is placed on the long copper bar connected between the negative pole of the battery cell in the upper left corner of the battery pack and the negative pole of the fast-charge high-voltage connector (as shown in the figure). Figure 1 The black dot in the figure) and the long copper busbar connecting the negative electrode of the high-voltage discharge connector and the negative electrode of the battery cell in the upper left corner of the battery pack (as shown in the figure). Figure 1The black dot in the figure shows the location of the copper busbars). Due to the high manufacturing cost of the copper busbars, this method will increase the investment cost on the one hand, and the operation of fixing the long copper busbars is cumbersome, which may easily lead to increased working hours on the production line. On the other hand, if the long copper busbars corresponding to the fast charging circuit and the long copper busbars corresponding to the discharge circuit are not fixed properly, it is easy to cause the long copper busbars to wear out over a long period of time, which may also cause battery pack leakage.

[0037] It should be noted that the discharge circuit of the battery pack mentioned above can also be provided with, but not limited to, fuses, main positive relays, pre-charge relays, pre-charge resistors, main negative relays and Hall sensors to ensure that the discharge process of the battery pack is carried out normally and to avoid potential safety hazards. The main positive relay, pre-charge relay and main negative relay can all be controlled by the battery management system according to a preset automatic control program to control the on-off state of the corresponding contacts, which will not be elaborated here. The charging circuit of the battery pack mentioned above can also be provided with, but not limited to, fast charging positive relays, main positive relays, pre-charge relays, pre-charge resistors, fuses, Hall sensors, main negative relays and fast charging negative relays to ensure that the charging process of the battery pack is carried out normally and to avoid potential safety hazards. The fast charging positive relay, main positive relay, pre-charge relay, main negative relay and fast charging negative relay can all be controlled by the battery management system according to a preset automatic control program to control the on-off state of the corresponding contacts, which will not be elaborated here.

[0038] See next Figure 2 , Figure 2 A high-voltage architecture design effect diagram of a battery pack provided by an embodiment of the present invention is shown.

[0039] like Figure 2 As shown, the high-voltage architecture of the battery pack includes a discharge high-voltage connector and a fast-charge high-voltage connector arranged outside the battery pack, and a first battery pack, a second battery pack, a first switching device, and a second switching device arranged inside the battery pack, wherein:

[0040] The positive pole of the discharge high-voltage connector is connected to the positive pole of the second battery pack and one end of the first on-off device, respectively. The negative pole of the discharge high-voltage connector is connected to the negative pole of the first battery pack and the other end of the first on-off device, respectively. In addition, the discharge high-voltage connector can also be connected to electrical appliances on the vehicle to supply power to the electrical appliances during the battery pack discharge process.

[0041] The positive electrode of the fast-charge high-voltage connector is connected to the positive electrode of the first battery pack and one end of the second on-off device, respectively. The negative electrode of the fast-charge high-voltage connector is connected to the negative electrode of the second battery pack and the other end of the second on-off device, respectively. In addition, the fast-charge high-voltage connector can also be connected to an external power source to charge the battery pack through the fast-charge high-voltage connector while the battery pack is in the charging process.

[0042] The first on-off device and the second on-off device are also connected to the battery management system to realize the on-off of the corresponding circuit according to the drive signal output by the battery management system according to the preset automatic control program. For example, but not limited to, when the battery management system outputs a high-level drive signal to the first on-off device, the first on-off device can be converted from the off state to the on state, that is, a short circuit is caused on the discharge high-voltage connector side; when the battery management system outputs a high-level drive signal to the second on-off device, the second on-off device can be converted from the off state to the on state, that is, a short circuit is caused on the fast-charging high-voltage connector side. In an embodiment of the present utility model, the battery management system can also, but is not limited to, output a low-level drive signal to the first on-off device or the second on-off device, and the way in which the battery management system outputs the drive signal to the first on-off device or the second on-off device is a battery management technical means well known in the art.

[0043] It should be noted that in order to avoid the cost of additional components, the first on-off device in the embodiment of the present invention can be but is not limited to being composed of the above-mentioned fast charging negative relay and corresponding contacts, and the second on-off device can be but is not limited to being composed of the above-mentioned main negative relay and corresponding contacts.

[0044] Here, the sum of the number of battery cells contained in the first battery group and the number of battery cells contained in the second battery group is equal to the number of battery cells contained in the battery pack, that is, the battery pack can be divided into a first battery group and a second battery group, and when the battery pack is in the discharge process, the first battery group and the second battery group can be connected in series to form the entire battery pack for discharge; when the battery pack is in the charging process, the first battery group and the second battery group can also be connected in series to form the entire battery pack for charging.

[0045] It is understandable that when the battery pack is in the discharge process, the battery management system can control the first on-off device to be in the off state and the second on-off device to be in the on state according to the preset automatic control program. Figure 2The positive electrode of the battery cell at the lower left corner of the second battery pack is connected to the positive electrode of the discharge high-voltage connector, the negative electrode of the discharge high-voltage connector is connected to the negative electrode of the battery cell on the left of the first battery pack, the positive electrode of the battery cell on the right of the first battery pack is connected to the negative electrode of the battery cell at the upper right corner of the second battery pack through copper bars to form a discharge circuit of the battery pack; when the battery pack is in the charging process, the battery management system can control the first on-off device to be in the on state and the second on-off device to be in the off state according to the preset automatic control program. Figure 2 The positive pole of the fast-charge high-voltage connector is connected to the positive pole of the right battery cell in the first battery pack, the negative pole of the left battery cell in the first battery pack is connected to the positive pole of the lower left battery cell in the second battery pack, and the negative pole of the upper right battery cell in the second battery pack is connected to the negative pole of the fast-charge high-voltage connector through copper busbars to form a discharge circuit for the battery pack. Figure 2 It can be seen that the fast charging circuit and the discharge circuit are staggered and long copper bars are avoided, which reduces investment costs while improving the assembly efficiency of the production line. Secondly, the battery management system can also control the on-off status of the first on-off device and the second on-off device to ensure the normal execution of the charging and discharging process of the battery pack, thereby ensuring the overall safety of the battery pack.

[0046] As an optional embodiment of the present invention, the first switching device includes a first relay and a first normally open contact corresponding to the first relay, wherein:

[0047] The first relay is connected to the battery management system;

[0048] One end of the first normally open contact is connected to the positive pole of the discharge high-voltage connector and the positive pole of the second battery pack respectively; the other end of the first normally open contact is connected to the negative pole of the discharge high-voltage connector and the negative pole of the first battery pack respectively.

[0049] It can be understood that the first relay can be but is not limited to the fast charging negative relay mentioned above. When the battery pack is in the discharge process, the battery management system can output a low-level drive signal to the first relay according to a preset automatic control program to keep the first normally open contact in a disconnected state, thereby ensuring the normal execution of the discharge process; when the battery pack is in the charging process, the battery management system can output a high-level drive signal to the first relay according to a preset automatic control program to convert the first normally open contact from a disconnected state to a conductive state, thereby causing a short circuit on one side of the discharge high-voltage connector, thereby ensuring the normal execution of the charging process.

[0050] Of course, in the embodiment of the present invention, the first normally open contact can also be replaced by a first normally closed contact, which will not be described in detail here.

[0051] As another optional embodiment of the present invention, the second switching device includes a second relay and a second normally open contact corresponding to the second relay, wherein:

[0052] The second relay is connected to the battery management system;

[0053] One end of the second normally open contact is respectively connected to the positive pole of the fast charging high-voltage connector and the positive pole of the first battery pack; the other end of the second normally open contact is respectively connected to the negative pole of the fast charging high-voltage connector and the negative pole of the second battery pack.

[0054] It can be understood that the second relay can be but is not limited to the main negative relay mentioned above. When the battery pack is in the discharge process, the battery management system can output a high-level drive signal to the second relay according to a preset automatic control program to convert the second normally open contact from the disconnected state to the on state, thereby causing a short circuit on one side of the fast charging high-voltage connector, thereby ensuring the normal execution of the discharge process; when the battery pack is in the charging process, the battery management system can output a low-level drive signal to the second relay according to a preset automatic control program to keep the second normally open contact in the disconnected state, thereby ensuring the normal execution of the charging process.

[0055] Of course, in the embodiment of the present invention, the second normally open contact can also be replaced by a second normally closed contact, which will not be described in detail here.

[0056] See next Figure 3 , Figure 3 A rendering of a high-voltage architecture design of another battery pack provided by an embodiment of the present invention is shown.

[0057] like Figure 3 As shown, the battery pack's high-voltage architecture also includes a fuse, which automatically disconnects the circuit when the battery pack's discharge or charge circuit current exceeds a set value, preventing damage or fire caused by faults such as overcurrent and short circuit. One end of the fuse is connected to one end of the first on-off device and the positive electrode of the discharge high-voltage connector; the other end of the fuse is connected to the positive electrode of the second battery pack.

[0058] like Figure 3As shown, the battery pack's high-voltage architecture also includes a third on-off device. This device can be controlled by the battery management system to disconnect the circuit when the battery management system detects a vehicle anomaly, thereby preventing danger from the high-voltage power supply. It is understood that the third on-off device can be, but is not limited to, composed of the aforementioned main positive relay and corresponding contacts. By connecting to the battery management system, the third on-off device can switch the corresponding circuit on and off based on the drive signal output by the battery management system according to a preset automatic control program. For example, if the third on-off device includes a main positive relay and corresponding normally open contacts, when the battery management system outputs a high-level drive signal to the main positive relay, the corresponding normally open contact can be switched from an open state to a conducting state; when the battery management system outputs a low-level drive signal to the main positive relay, the corresponding normally open contact can remain in an open state.

[0059] Here, one end of the third switching device is connected to one end of the first switching device and the positive electrode of the discharge high-voltage connector respectively; the other end of the third switching device is connected to one end of the fuse.

[0060] like Figure 3 As shown, the high-voltage architecture of the battery pack also includes a pre-charge resistor and a fourth on-off device. The fourth on-off device and the pre-charge resistor can ensure startup stability by limiting the current during the operation of the vehicle's high-voltage system to prevent damage to devices caused by current surges. It can be understood that the fourth on-off device can be, but is not limited to, composed of the above-mentioned pre-charge relay and corresponding contacts, and is connected to the battery management system to realize the on-off of the corresponding circuit according to the drive signal output by the battery management system according to a preset automatic control program. For example, taking the fourth on-off device including the pre-charge relay and the corresponding normally open contact as an example, when the battery management system outputs a high-level drive signal to the pre-charge relay, the corresponding normally open contact can be converted from an off state to an on state; when the battery management system outputs a low-level drive signal to the pre-charge relay, the corresponding normally open contact can be kept in an off state.

[0061] Here, one end of the pre-charging resistor is respectively connected to one end of the first on-off device and the positive pole of the discharge high-voltage connector, and the other end of the pre-charging resistor is connected to one end of the fourth on-off device; the other end of the fourth on-off device is connected to one end of the fuse, and the fourth on-off device is also connected to the battery management system.

[0062] It should be noted that when the battery pack is in the discharge process or the initial stage of the charging process, the battery management system can first control the third on-off device mentioned above to be in the off state, and control the fourth on-off device to be in the on state, so as to limit the circuit current through the pre-charging resistor; then, after a certain period of time, the battery management system can control the third on-off device to be in the on state, and control the fourth on-off device to be in the off state, so as to ensure the normal execution of the discharge process or the charging process.

[0063] like Figure 3 As shown, the high-voltage architecture of the battery pack also includes a first Hall sensor for detecting the discharge loop current of the battery pack. One end of the first Hall sensor is connected to the negative pole of the discharge high-voltage connector, and the other end of the first Hall sensor is respectively connected to the negative pole of the first battery pack and the other end of the first switching device.

[0064] pass Figure 3 It can be seen from the above-mentioned multiple embodiments that when the battery pack is in the discharge process, the discharge circuit of the battery includes not only the discharge high-voltage connector, the first battery pack, the second battery pack, the first on-off device (which can also be understood as the fast-charging negative relay in this field) and the second on-off device (which can also be understood as the main negative relay in this field), but also a fuse, a third on-off device (which can also be understood as the main positive relay in this field), a fourth on-off device (which can also be understood as the pre-charging relay in this field), a pre-charging resistor and a Hall sensor, etc., to ensure the normal execution of the discharge process of the battery pack and avoid safety hazards.

[0065] In addition to this Figure 3 As shown, the high-voltage architecture of the battery pack also includes a fifth on-off device, which can be controlled by the battery management system to cut off the circuit in which it is located when the battery management system detects abnormal charging of the vehicle to prevent the danger caused by the high-voltage power supply. It can be understood that the fifth on-off device can be, but is not limited to, composed of the fast-charging positive relay and corresponding contacts mentioned above, and is connected to the battery management system to realize the on-off of the corresponding circuit according to the drive signal output by the battery management system according to the preset automatic control program. For example, taking the fifth on-off device including the fast-charging positive relay and the corresponding normally open contact as an example, when the battery management system outputs a high-level drive signal to the fast-charging positive relay, the corresponding normally open contact can be converted from the disconnected state to the on state; when the battery management system outputs a low-level drive signal to the fast-charging positive relay, the corresponding normally open contact can be kept in the disconnected state.

[0066] Here, one end of the fifth on-off device is connected to the positive electrode of the first battery pack and one end of the second on-off device respectively; the other end of the fifth on-off device is connected to the positive electrode of the fast charging high-voltage connector.

[0067] like Figure 3 As shown, the high-voltage architecture of the battery pack also includes a second Hall sensor for detecting the charging circuit current of the battery pack. One end of the second Hall sensor is connected to the negative pole of the second battery pack and the other end of the second switching device, and the other end of the second Hall sensor is connected to the negative pole of the fast charging high-voltage connector.

[0068] pass Figure 3 It can also be seen from the above-mentioned multiple embodiments that when the battery pack is in the charging process, the battery charging circuit includes not only the fast-charging high-voltage connector, the first battery pack, the second battery pack, the first on-off device (which can also be understood as the fast-charging negative relay in this field) and the second on-off device (which can also be understood as the main negative relay in this field), but also the fifth on-off device (which can also be understood as the fast-charging positive relay in this field), the third on-off device (which can also be understood as the main positive relay in this field), the fourth on-off device (which can also be understood as the pre-charging relay in this field), the pre-charging resistor, the fuse and the Hall sensor, etc., to ensure the normal execution of the charging process of the battery pack and avoid safety hazards.

Claims

1. A high voltage architecture for a battery pack, characterized in that: The battery pack includes a discharge high-voltage connector and a fast-charge high-voltage connector arranged outside the battery pack, and a first battery pack, a second battery pack, a first on-off device, and a second on-off device arranged inside the battery pack, wherein: The positive electrode of the discharge high-voltage connector is respectively connected to the positive electrode of the second battery pack and one end of the first switching device, and the negative electrode of the discharge high-voltage connector is respectively connected to the negative electrode of the first battery pack and the other end of the first switching device; The positive electrode of the fast-charge high-voltage connector is respectively connected to the positive electrode of the first battery pack and one end of the second on-off device, and the negative electrode of the fast-charge high-voltage connector is respectively connected to the negative electrode of the second battery pack and the other end of the second on-off device; The first on-off device and the second on-off device are further connected to a battery management system.

2. The high voltage architecture of the battery pack according to claim 1, characterized in that: The first on-off device includes a first relay and a first normally open contact corresponding to the first relay, wherein: The first relay is connected to the battery management system; One end of the first normally open contact is connected to the positive pole of the discharge high-voltage connector and the positive pole of the second battery pack, and the other end of the first normally open contact is connected to the negative pole of the discharge high-voltage connector and the negative pole of the first battery pack.

3. The high voltage architecture of the battery pack according to claim 1, characterized in that: The second on-off device includes a second relay and a second normally open contact corresponding to the second relay, wherein: The second relay is connected to the battery management system; One end of the second normally open contact is respectively connected to the positive pole of the fast charging high-voltage connector and the positive pole of the first battery pack, and the other end of the second normally open contact is respectively connected to the negative pole of the fast charging high-voltage connector and the negative pole of the second battery pack.

4. The high-voltage architecture of the battery pack according to claim 1, characterized in that: It also includes a fuse, one end of which is connected to one end of the first on-off device and the positive electrode of the discharge high-voltage connector, and the other end of the fuse is connected to the positive electrode of the second battery pack.

5. The high voltage architecture of the battery pack according to claim 4, characterized in that: It also includes a third on-off device, one end of which is respectively connected to one end of the first on-off device and the positive pole of the discharge high-voltage connector, the other end of the third on-off device is connected to one end of the fuse, and the third on-off device is also connected to the battery management system.

6. The high-voltage architecture of the battery pack according to claim 5, characterized in that: It also includes a pre-charge resistor and a fourth on-off device, wherein: One end of the pre-charging resistor is connected to one end of the first switching device and the positive electrode of the discharge high-voltage connector, respectively, and the other end of the pre-charging resistor is connected to one end of the fourth switching device; The other end of the fourth switching device is connected to one end of the fuse, and the fourth switching device is also connected to the battery management system.

7. The high voltage architecture of the battery pack according to claim 1, characterized in that: It also includes a first Hall sensor, one end of which is connected to the negative electrode of the discharge high-voltage connector, and the other end of which is respectively connected to the negative electrode of the first battery pack and the other end of the first switching device.

8. The high voltage architecture of the battery pack according to claim 1, characterized in that: It also includes a fifth on-off device, one end of which is connected to the positive pole of the first battery pack and one end of the second on-off device respectively, the other end of the fifth on-off device is connected to the positive pole of the fast charging high-voltage connector, and the fifth on-off device is also connected to the battery management system.

9. The high voltage architecture of the battery pack according to claim 1, characterized in that: It also includes a second Hall sensor, one end of which is connected to the negative pole of the second battery pack and the other end of the second switching device, and the other end of the second Hall sensor is connected to the negative pole of the fast charging high-voltage connector.

10. The high voltage architecture of the battery pack according to claim 1, characterized in that: The first battery pack includes two battery cells connected in series, and the second battery pack includes six battery cells connected in series in sequence.

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