A battery pack control circuit and a battery pack

Abstract

The present invention discloses a battery pack control circuit and a battery pack. The battery pack control circuit includes n battery branches, a remote control unit, a battery pack disconnection unit, and a battery management system; the n battery branches are symmetrically arranged; each battery branch is composed of at least three battery modules connected in series, and each battery branch realizes communication connection with the battery management system through an internal communication interface; the battery pack disconnection unit is electrically connected to the battery management system and the n battery branches respectively, and is used to realize charge and discharge control of the battery branches under the control of the battery management system; the remote control unit is electrically connected to the battery management system, and the battery management system realizes communication connection with the server end through the remote control unit. The present invention not only meets the high-rate discharge working conditions, but also is applicable to application scenarios with small power, low voltage platform, and high discharge rate, achieving the technical effects of simplifying the circuit connection structure, reducing the installation difficulty, and reducing the volume of the battery pack.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of battery pack control, and in particular, to a battery pack control circuit and a battery pack. Background Art

[0002] To solve the problem that the discharge rate of a single module or battery box is insufficient under high-rate discharge conditions, a multi-branch battery system is often used to cope with high-rate discharge conditions.

[0003] At present, the multi-branch battery system usually adopts a scheme of multiple battery packs + independent external BDU (Battery Disconnect Unit). The BMS (Battery Management System) in the battery system is distributed, that is, in the form of a main board + multiple slave boards, and is connected in parallel outside the battery pack box by harnesses to form multiple branch outputs. Therefore, more connecting harnesses are required between battery packs. This method not only greatly increases the material cost, but also increases the installation difficulty due to too many connecting harnesses and battery packs, and is not suitable for working conditions with small battery capacity, low voltage platform and high discharge rate. Summary of the Invention

[0004] The present invention provides a battery pack control circuit and a battery pack, which solve the technical problems in the prior art that the BMS of the multi-branch battery system is arranged outside the battery pack box, resulting in a large number of harnesses, difficult installation and large battery pack volume due to external connection of the battery pack.

[0005] The embodiments of the present invention provide a battery pack control circuit. The battery pack control circuit includes n battery branches, a remote control unit, a battery pack disconnect unit and a battery management system, where n≥2 and n is an even number; the n battery branches are symmetrically arranged;

[0006] Each battery branch is composed of at least three battery modules connected in series, and each battery branch realizes communication connection with the battery management system through an internal communication interface;

[0007] The battery pack disconnect unit is respectively electrically connected to the battery management system and the n battery branches, and is used to realize charge and discharge control of the battery branches under the control of the battery management system;

[0008] The remote control unit is electrically connected to the battery management system, and the battery management system realizes communication connection with the server through the remote control unit.

[0009] Further, the battery pack disconnect unit includes a discharge positive interface, a discharge negative interface, a main positive relay, a main negative relay, a slow charge positive interface, a slow charge negative interface and a slow charge relay;

[0010] The first end of the main positive relay is electrically connected to the positive electrode of each battery branch and the first power control end of the battery management system, respectively, and the second end of the main positive relay is electrically connected to the positive discharge interface;

[0011] The first end of the main negative relay is electrically connected to the negative electrode of each battery branch and the second power control end of the battery management system, respectively, and the second end of the main negative relay is electrically connected to the negative discharge interface;

[0012] The first end of the slow charge relay is electrically connected to the positive electrode of each battery branch and the first end of the main positive relay, and the second end of the slow charge relay is electrically connected to the positive slow charge interface;

[0013] The negative slow charge interface is electrically connected to the negative electrode of each battery branch and the second end of the main negative relay.

[0014] Further, the battery pack disconnection unit further includes a main fuse; the main fuse is disposed between the first end of the main positive relay and the positive electrode of the battery branch.

[0015] Further, the battery pack disconnection unit further includes a pre-charge relay and a pre-charge resistor;

[0016] The first end of the pre-charge relay is electrically connected to the first end of the main positive relay, the second end of the pre-charge relay is electrically connected to the first end of the pre-charge resistor, and the second end of the pre-charge resistor is electrically connected to the second end of the main positive relay.

[0017] Further, the battery pack disconnection unit further includes a heating fuse and a heating relay;

[0018] The heating fuse and the heating relay are sequentially connected in series between the positive electrode of the battery branch and the first end of the slow charge relay.

[0019] Further, the battery pack disconnection unit further includes a shunt; the first end of the shunt is electrically connected to the negative electrode of each battery branch, and the second end of the shunt is electrically connected to the first end of the main negative relay.

[0020] Further, the battery pack disconnection unit further includes at least one Hall sensor; one Hall sensor is disposed between the negative electrode of one of the n battery branches and the first end of the shunt.

[0021] Further, the battery pack disconnection unit further includes a vehicle communication interface; the battery management system includes a key wake-up end, a power positive end, a power negative end, a charge wake-up end, a charge positive end, and a charge negative end;

[0022] The key wake-up terminal, the positive power terminal, the negative power terminal, the charging wake-up terminal, the positive charging terminal, and the negative charging terminal are all electrically connected to the vehicle communication interface.

[0023] Further, the remote control unit includes a GPS antenna and a GPRS antenna.

[0024] An embodiment of the present invention further provides a battery pack, which includes the battery pack control circuit and a housing described in any of the above embodiments;

[0025] The housing includes a first upper cover, a second upper cover, and a box body; the first upper cover is disposed on a side of the second upper cover away from the box body, and the battery pack control circuit is disposed between the second upper cover and the box body.

[0026] The present invention discloses a battery pack control circuit and a battery pack. The battery pack control circuit includes n battery branches, a remote control unit, a battery pack disconnection unit, and a battery management system, where n≥2 and n is an even number; the n battery branches are symmetrically arranged; each battery branch is composed of at least three battery modules connected in series, and each battery branch realizes communication connection with the battery management system through an internal communication interface; the battery pack disconnection unit is electrically connected to the battery management system and the n battery branches respectively, and is used to realize charge and discharge control of the battery branches under the control of the battery management system; the remote control unit is electrically connected to the battery management system, and the battery management system realizes communication connection with the server through the remote control unit. The present invention solves the technical problems in the prior art that the BMS of the multi-branch battery system is arranged outside the battery pack box, resulting in a large number of wires, difficult installation, and a large volume of the battery pack. It not only meets the high-rate discharge working conditions, but also is applicable to application scenarios with small power, low voltage platform, and high discharge rate, achieving the technical effects of simplifying the circuit connection structure, reducing the installation difficulty, and reducing the volume of the battery pack. Description of the Drawings

[0027] Figure 1 is a structural diagram of a battery pack control circuit provided by an embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of the symmetric arrangement of battery modules in two battery branches provided by an embodiment of the present invention;

[0029] Figure 3 is a circuit diagram of a battery pack control circuit provided by an embodiment of the present invention;

[0030] Figure 4 is a structural diagram of a battery pack provided by an embodiment of the present invention;

[0031] Figure 5It is a partially enlarged view of a battery management system BMS, a remote control unit DTU, and a battery pack disconnection unit BDU in a battery pack provided by an embodiment of the present invention. Detailed implementation manners

[0032] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0033] It should be noted that the terms "first", "second", etc. in the specification, claims, and drawings of the present invention are used to distinguish different objects, rather than to limit a specific order. Each of the following embodiments of the present invention can be executed independently, and the embodiments can also be combined with each other. The embodiments of the present invention do not make specific limitations in this regard.

[0034] Figure 1 It is a structural diagram of a battery pack control circuit provided by an embodiment of the present invention. Figure 2 It is a schematic diagram of the symmetric arrangement of battery modules in two battery branches provided by an embodiment of the present invention.

[0035] As Figure 1 shown, the battery pack control circuit includes n battery branches Ni, a remote control unit DTU (Data Transfer unit), a battery pack disconnection unit BDU, and a battery management system BMS, where n≥2 and n is an even number, i represents the number of battery branches, and i = 1, 2,..., n; the n battery branches Ni are symmetrically arranged.

[0036] Each battery branch Ni is composed of at least three battery modules BM connected in series, and each battery branch Ni is communicatively connected to the battery management system BMS through an internal communication interface 10.

[0037] The battery pack disconnection unit BDU is electrically connected to the battery management system BMS and the n battery branches respectively, and is used to realize the charge and discharge control of the battery branches under the control of the battery management system BMS.

[0038] The remote control unit DTU is electrically connected to the battery management system BMS, and the battery management system BMS realizes the communication connection with the server through the remote control unit DTU.

[0039] Exemplarily, Figure 1 and Figure 2When n = 2, that is, the battery pack control circuit includes two battery branches N1 and N2, and each battery branch is formed by three battery modules BM connected in series. For the convenience of description, in the present application, the battery pack control circuit with two battery branches N1 and N2, and each battery branch formed by three battery modules BM connected in series is used for explanation below.

[0040] Specifically, referring to Figure 1 and Figure 2 , both battery branch N1 and battery branch N2 include 3 battery modules BM, and the arrangement modes of the two battery branches are symmetric left and right to ensure the consistency of the output loop; battery branch N1 and battery branch N2 are connected to the battery pack disconnection unit BDU through busbars, and then output to the positive and negative sockets (that is, the following discharge positive interface A+ and discharge negative interface A-) through the battery pack disconnection unit BDU. Setting the battery branch Ni in a symmetric double-branch module arrangement mode can effectively avoid the problem of discharge voltage difference caused by different lengths of external busbars. At the same time, since the battery pack disconnection unit BDU is integrated inside the battery pack, the external transfer is reduced, making the structure of the battery pack more compact and reducing the material cost. Figure 2 In the shown N1+ is the positive pole of battery branch N1, N2+ is the positive pole of battery branch N2, N1- is the negative pole of battery branch N1, and N2- is the negative pole of battery branch N2.

[0041] The battery management system BMS outputs the battery cell information collected in each battery branch Ni to the whole vehicle, and at the same time can also transmit the collected information to the remote control unit DTU. The remote control unit DTU outputs the battery cell information to the cloud through an external antenna, realizes the communication connection with the cloud server, and at the same time can also realize the functions of real-time positioning and monitoring of the battery pack information through the external antenna.

[0042] In the present invention, by setting multiple battery branches in a symmetric module arrangement mode, and integrating the battery pack disconnection unit BDU, the remote control unit DTU and the battery management system BMS into the battery pack as a whole, the technical problems in the prior art that the BMS of the multi-branch battery system is arranged outside the battery pack box, resulting in a large number of wiring harnesses, difficult installation and a large volume of the battery pack are solved. It not only meets the high-rate discharge working conditions, but also is applicable to the application scenarios with small power, low voltage platform and high discharge rate, realizing the technical effects of simplifying the circuit connection structure, reducing the installation difficulty and reducing the volume of the battery pack.

[0043] Figure 3 is the circuit diagram of a battery pack control circuit provided by an embodiment of the present invention. Figure 4 is the structure diagram of a battery pack provided by an embodiment of the present invention. Figure 5It is a partial enlarged view of a battery management system BMS, a remote control unit DTU, and a battery pack disconnection unit BDU in a battery pack provided by an embodiment of the present invention.

[0044] Optionally, as Figures 3 - 5 shown, the battery pack disconnection unit BDU includes a discharge positive interface A+, a discharge negative interface A-, a main positive relay K1, a main negative relay K2, a slow charge positive interface B+, a slow charge negative interface B-, and a slow charge relay K3.

[0045] The first end of the main positive relay K1 is electrically connected to the positive electrode of each battery branch Ni and the first power control terminal C1 of the battery management system BMS, respectively, and the second end of the main positive relay K1 is electrically connected to the discharge positive interface A+.

[0046] The first end of the main negative relay K2 is electrically connected to the negative electrode of each battery branch Ni and the second power control terminal C2 of the battery management system BMS, respectively, and the second end of the main negative relay K2 is electrically connected to the discharge negative interface A-.

[0047] The first end of the slow charge relay K3 is electrically connected to the positive electrode of each battery branch Ni and the first end of the main positive relay K1, and the second end of the slow charge relay K3 is electrically connected to the slow charge positive interface B+; the slow charge negative interface B- is electrically connected to the negative electrode of each battery branch Ni and the second end of the main negative relay K2.

[0048] Specifically, the discharge positive interface A+, the discharge negative interface A-, the slow charge positive interface B+, and the slow charge negative interface B- are all interfaces of the battery pack control circuit to the outside. After the discharge positive interface A+ and the discharge negative interface A- send a power consumption signal to the battery management system BMS, the battery management system BMS controls the main positive relay K1 and the main negative relay K2 to close, and the battery branch Ni outputs electrical energy through the discharge positive interface A+ and the discharge negative interface A-. See Figure 3 , that is, the line between the 11th port of the battery branch N1 and the discharge positive interface A+ and the line between the 14th port and the discharge negative interface A- are the discharge lines of the battery branch N1; the line between the 21st port of the battery branch N2 and the discharge positive interface A+ and the line between the 24th port and the discharge negative interface A- are the discharge lines of the battery branch N2.

[0049] After the slow charge positive interface B+ and the slow charge negative interface B- send a charging signal to the battery management system BMS, the battery management system BMS controls the slow charge relay K3 and the main negative relay K2 to close, and charges the battery branch Ni through the slow charge positive interface B+ and the slow charge negative interface B-. See Figure 3, the lines between port 11 of battery branch N1 and slow charge positive interface B+ and between port 14 of battery branch N1 and slow charge negative interface B- are the charging lines of battery branch N1; the lines between port 21 of battery branch N2 and slow charge positive interface B+ and between port 24 of battery branch N2 and slow charge negative interface B- are the charging lines of battery branch N2.

[0050] The line connecting port 13 of battery branch N1 to the battery management system BMS through internal communication interface 10 is the communication line between battery branch N1 and the battery management system BMS; the line connecting port 23 of battery branch N2 to the battery management system BMS through internal communication interface 10 is the communication line between battery branch N2 and the battery management system BMS.

[0051] Optionally, as Figures 3 - 5 shown, the battery pack disconnection unit BDU further includes a main fuse f1; the main fuse f1 is disposed between the first end of the main positive relay K1 and the positive electrode of battery branch Ni.

[0052] Specifically, the function of the main fuse f1 is to fuse in case of a short circuit to protect battery branch Ni from being burned by large current.

[0053] Optionally, as Figures 3 - 5 shown, the battery pack disconnection unit BDU further includes a pre-charge relay K4 and a pre-charge resistor R; the first end of the pre-charge relay K4 is electrically connected to the first end of the main positive relay K1, the second end of the pre-charge relay K4 is electrically connected to the first end of the pre-charge resistor R, and the second end of the pre-charge resistor R is electrically connected to the second end of the main positive relay K1.

[0054] Specifically, a relatively large capacitor is provided at the front end of the battery module. If pre-charging is not set, when the main positive relay K1 is directly connected to the capacitor, due to the relatively high voltage of the battery module and the voltage on the capacitor being close to 0, the large voltage difference between the two is equivalent to an instantaneous short circuit. At this time, the large current passing through instantaneously is likely to damage the main positive relay K1. Therefore, a pre-charge function needs to be set. The pre-charge relay K4 and the pre-charge resistor R together form a pre-charge circuit. The function of the pre-charge relay K4 is to control the on / off of the pre-charge circuit, and the function of the pre-charge resistor R is to limit the current.

[0055] Optionally, as Figures 3 - 5 shown, the battery pack disconnection unit BDU further includes a heating fuse f2 and a heating relay K5; the heating fuse f2 and the heating relay K5 are sequentially connected in series between the positive electrode of battery branch Ni and the first end of the slow charge relay K3.

[0056] Specifically, during the charging process of the battery modules in the battery branch Ni, the heating relay K5 will only close when the temperature reaches the set temperature value to ensure charging in a good charging environment. The function of the heating fuse f2 is to cut off in case of a short circuit to protect the battery branch Ni from being burned. Refer to Figure 3 , the lines between the 12-port of the battery branch N1 and the discharge positive interface A+ and the lines between the 22-port of the battery branch N2 and the discharge positive interface A+ are both heating output lines; the lines between the 15-port of the battery branch N1 and the discharge negative interface A- and the lines between the 25-port of the battery branch N2 and the discharge negative interface A- are both heating input lines.

[0057] Optionally, as Figures 3 - 5 shown, the battery pack disconnect unit BDU further includes a shunt S; the first end of the shunt S is electrically connected to the negative electrode of each battery branch Ni, and the second end of the shunt S is electrically connected to the first end of the total negative relay K2.

[0058] Specifically, the shunt S is used to measure the total current value of multiple battery branches Ni and send the measured total current to the battery management system BMS for standby.

[0059] Optionally, as Figures 3 - 5 shown, the battery pack disconnect unit BDU further includes at least one Hall sensor H; one Hall sensor H is disposed between the negative electrode of one of the n battery branches Ni and the first end of the shunt S.

[0060] Specifically, taking the two battery branches N1 and N2 as an example, since the battery branches N1 and N2 are symmetrically arranged and theoretically all data in the two battery branches are the same, only one Hall sensor H needs to be set between the battery branch N1 and the shunt S to collect the branch current of the battery branch N1. Exemplarily, if it is necessary to determine the branch current of the battery branch N2, the battery management system BMS can subtract the branch current of the battery branch N1 from the total current value collected by the shunt S to obtain the branch current value of the battery branch N2, which will not be elaborated here.

[0061] It should be noted that if there are more than two battery branches Ni in the battery pack control circuit, Hall sensors H can be set in some of the battery branches Ni or in all the battery branches Ni according to actual needs and cost budgets, which will not be elaborated here.

[0062] Optionally, as Figures 3 - 5As shown, the battery pack disconnection unit BDU further includes a vehicle communication interface D; the battery management system BMS includes a key wake-up terminal a, a power supply positive terminal b+, a power supply negative terminal b-, a charging wake-up terminal c, a charging positive terminal d+ and a charging negative terminal d-; the key wake-up terminal a, the power supply positive terminal a, the power supply negative terminal a, the charging wake-up terminal c, the charging positive terminal d+ and the charging negative terminal d- are all electrically connected to the vehicle communication interface D.

[0063] Specifically, the battery management system BMS realizes communication connection with the vehicle through the vehicle communication interface D. Exemplarily, when the driver uses the car key to start the ignition, the key wake-up terminal a of the battery management system BMS will receive an ignition signal through the vehicle communication interface D, then the battery management system BMS controls the main positive relay K1 and the main negative relay K2 to close respectively through the first power control terminal C1 and the second power control terminal C2, and supplies power to some electrical appliances of the vehicle system through the power supply positive terminal b+ and the power supply negative terminal b-; similarly, when the charger is connected to the battery pack through the slow charge positive interface B+ and the slow charge negative interface B-, the charging wake-up terminal c of the battery management system BMS will receive a charging wake-up signal through the vehicle communication interface D, then the battery management system BMS controls the slow charge relay K3 and the main negative relay K2 to close, and supplies power to some electrical appliances of the vehicle system through the charging positive terminal d+ and the charging negative terminal d-.

[0064] Optionally, as Figures 3 - 5 shown, the remote control unit DTU includes a GPS antenna and a GPRS antenna.

[0065] Specifically, the remote control unit DTU is provided with an external GPS antenna and a GPRS antenna, realizing the function of real-time positioning and monitoring of battery pack information.

[0066] In the embodiment of the present invention, by arranging multiple battery branches in a symmetric module arrangement, and integrating the battery pack disconnection unit BDU, the remote control unit DTU and the battery management system BMS into the battery pack, the technical problems in the prior art that the BMS of the multi-branch battery system is arranged outside the battery pack, resulting in a large number of wires, difficult installation and a large volume of the battery pack due to external connection of the battery pack are solved. It not only meets the high-rate discharge working conditions, but also is applicable to application scenarios with small battery capacity, low voltage platform and high discharge rate, achieving the technical effects of simplifying the line connection structure, reducing the installation difficulty and reducing the volume of the battery pack.

[0067] The embodiment of the present invention also provides a battery pack, as Figure 4As shown, the battery pack includes the battery pack control circuit 30 described in any of the above embodiments and the housing 40; the housing 40 includes a first upper cover 41, a second upper cover 42, and a box body 43; the first upper cover 41 is disposed on the side of the second upper cover 42 away from the box body 43, and the battery pack control circuit 30 is disposed between the second upper cover 42 and the box body 43.

[0068] The battery pack provided by the embodiment of the present invention includes the battery pack control circuit in the above embodiment. Therefore, the battery pack provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, which will not be elaborated here.

[0069] In the description of the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", and "coupled" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0070] Finally, it should be noted that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery pack control circuit, characterized in that, The battery pack control circuit includes n battery branches, a remote control unit, a battery pack disconnection unit, and a battery management system, where n≥2 and n is an even number; the n battery branches are symmetrically arranged; Each battery branch is composed of at least three battery modules connected in series, and each battery branch is communicatively connected to the battery management system through an internal communication interface; The battery pack disconnection unit is electrically connected to the battery management system and the n battery branches respectively, and is used to control the charging and discharging of the battery branches under the control of the battery management system; The remote control unit is electrically connected to the battery management system, and the battery management system realizes communication connection with the server through the remote control unit; In the battery pack disconnection unit: The first end of the main positive relay is electrically connected to the positive electrode of each battery branch and the first power control end of the battery management system respectively, and the second end of the main positive relay is electrically connected to the positive discharge interface; The first end of the main negative relay is electrically connected to the negative electrode of each battery branch and the second power control end of the battery management system respectively, and the second end of the main negative relay is electrically connected to the negative discharge interface; The first end of the slow charge relay is electrically connected to the positive electrode of each battery branch and the first end of the main positive relay, and the second end of the slow charge relay is electrically connected to the positive slow charge interface; The negative slow charge interface is electrically connected to the negative electrode of each battery branch and the second end of the main negative relay; When the positive discharge interface and the negative discharge interface send power consumption signals to the battery management system, the battery management system controls the main positive relay and the main negative relay to close, and the battery branch outputs electric energy to the outside through the positive discharge interface and the negative discharge interface.

2. The battery pack control circuit according to claim 1, wherein The battery pack disconnection unit further includes a main fuse; the main fuse is arranged between the first end of the main positive relay and the positive electrode of the battery branch.

3. The battery pack control circuit according to claim 1 or 2, characterized in that, The battery pack disconnection unit further includes a pre-charge relay and a pre-charge resistor; The first end of the pre-charge relay is electrically connected to the first end of the main positive relay, the second end of the pre-charge relay is electrically connected to the first end of the pre-charge resistor, and the second end of the pre-charge resistor is electrically connected to the second end of the main positive relay.

4. The battery pack control circuit according to claim 1 or 2, characterized in that, The battery pack disconnection unit further includes a heating fuse and a heating relay; The heating fuse and the heating relay are sequentially connected in series between the positive electrode of the battery branch and the first end of the slow charge relay.

5. The battery pack control circuit according to claim 1 or 2, characterized in that, The battery pack disconnection unit further includes a shunt; the first end of the shunt is electrically connected to the negative electrode of each battery branch, and the second end of the shunt is electrically connected to the first end of the main negative relay.

6. The battery pack control circuit according to claim 5, characterized in that, The battery pack disconnection unit further includes at least one Hall sensor; one Hall sensor is arranged between the negative electrode of one of the n battery branches and the first end of the shunt.

7. The battery pack control circuit according to claim 1, wherein The battery pack disconnection unit further includes a vehicle communication interface; the battery management system includes a key wake-up terminal, a positive power terminal, a negative power terminal, a charging wake-up terminal, a charging positive terminal, and a charging negative terminal; The key wake-up terminal, the positive power terminal, the negative power terminal, the charging wake-up terminal, the positive charging terminal and the negative charging terminal are all electrically connected to the vehicle communication interface.

8. The battery pack control circuit according to claim 1, characterized in that, The remote control unit includes a GPS antenna and a GPRS antenna.

9. A battery pack, characterized in that, The battery pack includes the battery pack control circuit according to any one of claims 1 to 8 above and a housing; The housing includes a first upper cover, a second upper cover and a box body; the first upper cover is arranged on a side of the second upper cover away from the box body, and the battery pack control circuit is arranged between the second upper cover and the box body.

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