Battery system and battery wireless communication system

Abstract

To provide a battery wireless communication system for a battery system.SOLUTION: A battery wireless communication system includes a control unit, a primary wireless communication unit, at least one monitoring chip, and at least one slave wireless communication unit. The main wireless communication unit is installed in the control unit, and the monitoring chip is connected to a battery unit. A slave wireless communication unit is disposed adjacently to the monitoring chip. An arrangement manner of the slave wireless communication unit with respect to the monitoring chip is a one-to-one corresponding installation architecture. A Whisper Communication establishes a Whisper radio signal connection between the main radio communication unit and two adjacent ones of the at least one slave radio communication unit.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to electronic systems, and more particularly to a battery system and its battery wireless communication system. [Background technology]

[0002] In response to the growing trend of the global energy storage system market, battery energy storage systems, in particular, have already become important devices in current electronic systems. To improve the efficiency of battery energy storage systems, most batteries are connected in series, and the DC voltage within the system increases as the number of batteries connected in series increases. As the series DC voltage value continues to increase, the DC voltage difference across the connected battery energy storage systems also continues to increase, posing increasing challenges to the safety and stability of battery energy storage systems.

[0003] Currently, most battery groups in industrial and vehicle battery energy storage systems are configured in a series configuration. Traditionally, series capacitive coupling or parallel inductive coupling has been used to isolate the voltage between batteries. Figure 1 is a schematic diagram of a conventional battery system, which includes a battery unit 10, a control unit 20, and multiple capacitors 30 connected in series. However, series capacitive coupling has low reliability and significantly impacts the safety of the battery energy storage system. On the other hand, parallel inductive coupling must withstand the high voltage difference accumulated when batteries are connected in series, and the reliability of these components also significantly impacts the safety of the battery energy storage system.

[0004] Furthermore, as the design of battery energy storage systems becomes more complex, battery energy storage systems also require the introduction of battery communication systems to monitor and collect information such as the voltage and temperature of each battery in the system to maintain the operation and safety of the battery energy storage. As the series DC voltage value continues to increase, the voltage difference across the connected battery energy storage communication system also continues to increase, posing increasing challenges to the safety and stability of the battery energy storage communication system. As shown in FIG. 2, to strengthen the connection between battery units 10, the battery communication system includes a battery unit 10, a control unit 20, and multiple communication units (40r, 40t) connected in parallel. The communication unit 40t is electrically connected to the control unit 20 to transmit signals, and the communication unit 40r is electrically connected to each battery unit 10 to receive signals. However, communication conflicts between different communication ports and the control unit often seriously affect communication stability, making it difficult to effectively identify the position and order of the batteries within the communication system, making actual operation, assembly, and maintenance difficult. Summary of the Invention

[0005] In view of this, the present disclosure relates to a battery system and its battery wireless communication system that realizes communication among a series-structured battery group using a wireless communication unit, establishes a one-to-one wireless communication architecture using a whisper communication method, and forms a daisy chain communication path, which not only improves the reliability of the battery system but also effectively overcomes the problem of communication collisions.

[0006] According to one aspect of the present disclosure, there is provided a battery wireless communication system including a control unit, a master wireless communication unit installed in the control unit, at least one monitoring chip connected to at least one battery unit, and at least one slave wireless communication unit installed adjacent to the at least one monitoring chip, the at least one slave wireless communication unit being arranged in a one-to-one correspondence with the at least one monitoring chip, wherein a whisper wireless signal connection is established between the master wireless communication unit and the at least one adjacent slave wireless communication unit or between the at least one slave wireless communication unit and each other by a whisper communication method.

[0007] In one embodiment, the number of the at least one monitoring chip is plural, the number of the at least one battery unit is plural, and the number of the at least one slave wireless communication unit is plural, each monitoring chip is connected to one of the battery units, and each slave wireless communication unit is configured to be connected to an adjacent monitoring chip, a first whisper wireless signal connection is established between the master wireless communication unit and at least one adjacent slave wireless communication unit, and at least one second whisper wireless signal connection is established between one of the plurality of slave wireless communication units and some other adjacent slave wireless communication units by a whisper communication method, and the first wireless signal connection and the at least one second whisper wireless signal connection are a one-to-one wireless communication architecture and form a daisy chain communication path.

[0008] In one embodiment, the master wireless communication unit transmits a first wireless signal based on an initial level, and gradually adjusts the level to limit the number of slave wireless communication units that respond to the first wireless signal until a set value is reached, thereby establishing a unique first whisper wireless signal connection between the master wireless communication unit and an adjacent slave wireless communication unit.

[0009] In one embodiment, one of the multiple slave wireless communication units transmits a second wireless signal based on an initial level, and gradually adjusts the level to limit the number of remaining slave wireless communication units that respond to the second wireless signal until a set value is reached, thereby establishing a unique second whisper wireless signal connection between one of the slave wireless communication units and another adjacent slave wireless communication unit.

[0010] According to another aspect of the present disclosure, there is provided a battery system including at least one battery unit and a battery wireless communication system. The battery wireless communication system includes a control unit, a master wireless communication unit installed in the control unit, at least one monitoring chip connected to the at least one battery unit, and at least one slave wireless communication unit installed adjacent to the at least one monitoring chip, the at least one slave wireless communication unit being arranged in a one-to-one correspondence with the at least one monitoring chip. A whisper wireless signal connection is established between the master wireless communication unit and the at least one adjacent slave wireless communication unit or between the at least one slave wireless communication unit and each other by a whisper communication method.

[0011] For a better understanding of these and other aspects of the present disclosure, the following examples will be given in detail with reference to the accompanying drawings. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram illustrating a known battery system. [Figure 2] FIG. 2 is a schematic diagram illustrating a known battery communication system. [Figure 3] FIG. 3 is a schematic diagram illustrating a battery system 100 and its battery wireless communication system CMS according to one embodiment of the present disclosure. [Figure 4] FIG. 4 is an enlarged schematic view showing the region 60 according to FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] The technical terms used in this specification refer to conventional terms in the relevant technical field, and when some terms are explained or defined in this specification, the interpretation of such terms shall be in accordance with the explanation or definition in this specification. Each embodiment of the present disclosure has one or more technical features. As long as it is feasible, a person skilled in the art may selectively implement some or all of the technical features in any embodiment, or selectively combine some or all of the technical features in these embodiments.

[0014] Referring to FIG. 3, this figure is a schematic diagram showing a battery system 100 and its battery wireless communication system CMS according to one embodiment of the present disclosure. The battery system 100 includes multiple battery units 10 and a battery wireless communication system CMS. In one embodiment, the number of battery units 10 may be only one. The battery unit 10 may be, for example, a lithium phosphate battery or a ternary lithium battery. These battery units 10 are connected in series. During operation of the battery system 100, these battery units 10 must be monitored one by one to check whether battery parameters such as temperature and voltage are normal. In particular, if a lithium phosphate battery is used as the battery unit 10, the battery unit 10 has a relatively gentle battery discharge curve, so a monitoring chip 50 must be installed in each battery unit 10 for precise monitoring. In one embodiment, the number of monitoring chips 50 may be only one.

[0015] In one embodiment, the battery unit 10 is preferably a lithium phosphate battery, which has a relatively gentle battery discharge curve. As the capacity of a single cell increases from a few amperes (2-3 Ah) to several hundred amperes (200-300 Ah), the battery system must monitor battery parameters more accurately and closely to maintain the stability of the battery system. To achieve this goal, the battery system of the present disclosure is designed as a one-to-one correspondence architecture, in which one monitoring chip 50 is installed for one battery unit 10, as shown in FIG. 3.

[0016] 3, the battery wireless communication system CMS includes the above-mentioned monitoring chip 50, a control unit 20, and a plurality of wireless communication units. The wireless communication units include a master wireless communication unit CM and slave wireless communication units C1, C2, C3, ..., Cn, and the number of slave wireless communication units may be only one. One monitoring chip 50 is connected to one battery unit 10. It is preferable that the number of slave wireless communication units C1, C2, C3, ..., Cn is the same as the number of monitoring chips 50.

[0017] In one embodiment, the control unit 20 includes a master wireless communication unit CM, which is used to control the monitoring chips 50 and collect monitoring information, such as current, electrical resistance, voltage, or temperature. The slave wireless communication units (C1, C2, C3, ..., Cn) are connected to adjacent monitoring chips 50 in a one-to-one correspondence. The master wireless communication unit CM and the slave wireless communication units C1, C2, C3, ..., Cn communicate with each other via whisper wireless communication between the control unit 20 and the first to last monitoring chips 50 to transmit commands to the monitoring chips 50 and return monitoring information from the monitoring chips 50. These wireless communication units (master wireless communication unit CM and slave wireless communication units C1, C2, C3, ..., Cn) form a daisy chain communication path.

[0018] In one embodiment, whisper wireless communication performed by the wireless communication units (master wireless communication unit CM and slave wireless communication units C1, C2, C3, ..., Cn) is performed only between the two closest neighboring wireless communication units, establishing a unique whisper wireless communication connection between them, without interfering with or being interfered with by other wireless communication units. For example, a unique first whisper wireless signal connection is established between the master wireless communication unit CM and the neighboring slave wireless communication unit C1. At this time, the master wireless communication unit CM does not establish wireless signal connections with the remaining slave wireless communication units C2, C3, ..., Cn. Alternatively, a unique second whisper wireless signal connection is established between the slave wireless communication unit C1 and another neighboring slave wireless communication unit C2. At this time, the slave wireless communication unit C1 establishes wireless signal connections only between the master wireless communication unit CM and the slave wireless communication unit C2, but does not establish wireless signal connections with the remaining slave wireless communication units C3, ..., Cn. The same applies below.

[0019] In one embodiment, the battery wireless communication system is designed as a one-to-one correspondence architecture in which one monitoring chip 50 is mounted for one wireless communication unit (slave wireless communication units C1, C2, C3, ..., Cn). That is, as shown in Fig. 3, the slave wireless communication units C1, C2, C3, ..., Cn are arranged in a one-to-one correspondence installation architecture with respect to the monitoring chip 50, forming a daisy chain communication path.

[0020] The control unit 20 may be, for example, a circuit, a circuit board, a memory device storing program code, or a chip, such as a central processing unit (CPU) or other programmable general-purpose or special-purpose micro control unit (MCU), microprocessor, digital signal processor (DSP), programmable controller, application specific integrated circuit (ASIC), graphics processing unit (GPU), image signal processor (ISP), image processing unit (IPU), arithmetic logic unit (ALU), complex programmable logic device (CPLD), field programmable gate array (FPGA), or other similar component or combination of the above components.

[0021] In one embodiment, the control unit 20 may be time calibrated by a host computer or a host server so that the control unit 20 has standard time information. The control unit 20 may transmit a time calibration signal to these monitoring chips 50 through these wireless communication units (master wireless communication unit CM, slave wireless communication units C1, C2, C3, ..., Cn), and these monitoring chips 50 may synchronously correct the time of their internal circuits according to the time calibration signal.

[0022] 3 and 4, FIG. 4 is an enlarged schematic diagram showing an area 60 in FIG. 3. The wireless communication unit of the present disclosure employs whisper wireless communication technology. The control unit 20 is connected to the master wireless communication unit CM, and each of the slave wireless communication units C1, C2, C3, ..., Cn preferably includes a first wireless communication line and a second wireless communication line. For example, the slave wireless communication unit C1 includes a first wireless communication line C11 and a second wireless communication line C12, and the slave wireless communication unit C2 includes a first wireless communication line C21 and a second wireless communication line C22. The slave wireless communication unit C1 and the slave wireless communication unit C2 are each connected to an adjacent monitoring chip 50.

[0023] 3 and 4, the wireless communication units (master wireless communication unit CM and slave wireless communication units C1, C2, C3, ..., Cn) are connected wirelessly and not directly physically connected to each other. For example, the master wireless communication unit CM and the slave wireless communication unit C1 (the first wireless communication circuit C11 therein) are connected wirelessly and not physically connected, and the slave wireless communication unit C1 (the second wireless communication circuit C12 therein) and the slave wireless communication unit C2 (the first wireless communication circuit C21 therein) are connected wirelessly and not physically connected. In this way, the present disclosure provides insulation using a medium such as air, which can withstand a high voltage difference accumulated when the battery units 10 are connected in series, significantly improving the operational safety of the battery system 100.

[0024] 3 and 4, the master wireless communication unit CM is electrically connected to the control unit 20, the slave wireless communication unit C1 (including the first wireless communication line C11 and the second wireless communication line C12) is electrically connected to the adjacent monitoring chip 50, and the slave wireless communication unit C2 (including the first wireless communication line C21 and the second wireless communication line C22) is electrically connected to the adjacent monitoring chip 50, and so on.

[0025] In one embodiment, there is a short distance L1 between adjacent wireless communication units (primary wireless communication unit CM, secondary wireless communication units C1, C2, C3, ..., Cn). For example, there is a distance L1 between the primary wireless communication unit CM and the first wireless communication line C11 of the secondary wireless communication unit C1. On the other hand, there is a long distance L2 between adjacent wireless communication units (primary wireless communication unit CM, secondary wireless communication units C1, C2, C3, ..., Cn). For example, there is a distance L2 between the primary wireless communication unit CM and the second wireless communication line C12 of the secondary wireless communication unit C1. Furthermore, there is a distance L3 between two non-adjacent wireless communication units (primary wireless communication unit CM, secondary wireless communication units C1, C2, C3, ..., Cn). For example, there is a distance L3 between the primary wireless communication unit CM and the first wireless communication line C21 of the secondary wireless communication unit C2. As can be seen from this, in the design of the daisy chain communication path architecture, the master wireless communication unit CM, the slave wireless communication unit C1, the slave wireless communication unit C2, etc. are installed in sequence and wirelessly connected, so that, as shown in FIG. 4, the distance L1 is shorter than the distance L2, and the distance L2 is shorter than the distance L3.

[0026] In one embodiment, a whisper wireless communication technique is adopted between the wireless communication units (master wireless communication unit CM, slave wireless communication units C1, C2, C3, ..., Cn). For example, the master wireless communication unit CM transmits a first wireless signal based on an initial level, and gradually adjusts the level until a preset value is reached to limit the number of slave wireless communication units (C1, C2, C3, ..., Cn) that respond to the master wireless communication unit CM. Here, the preset value is preferably 1, but is not limited to 1. Because the distance L1 is shorter than the distance L2, which is shorter than the distance L3, when the preset value is 1, only the slave wireless communication unit C1 can respond to the master wireless communication unit CM. Therefore, as shown in FIG. 4, a single first whisper wireless signal connection R1 is established between the master wireless communication unit CM and the adjacent slave wireless communication unit C1.

[0027] In one embodiment, one of the slave wireless communication units (here, the slave wireless communication unit C1 is taken as an example) transmits a second wireless signal based on an initial level and gradually adjusts the level until it reaches a preset value, limiting the number of the remaining slave wireless communication units (C2, C3, ..., Cn) that respond to the second wireless signal. Here, the preset value is preferably 1, but is not limited to 1. Similarly, due to the daisy-chain communication path architecture, there is a shortest distance L1 between the slave wireless communication unit C1 and the slave wireless communication unit C2 (of the first wireless communication link C21), which is shorter than the distance L2 between the slave wireless communication unit C1 and the slave wireless communication unit C2 (of the second wireless communication link C22), and the distance L2 is also shorter than the distance L3 between the slave wireless communication units (C1, C2). Therefore, when the preset value is 1, only the slave wireless communication unit C2 can respond to the second wireless signal. As a result, as shown in FIG. 4, a single second whisper wireless signal connection R2 is established between the slave wireless communication unit C1 and the next adjacent slave wireless communication unit C2.

[0028] In one embodiment, the signal transmission direction of the first whisper wireless signal connection R1 may be a signal transmission direction D1, in which the first wireless signal is transmitted from the master wireless communication unit CM to the adjacent slave wireless communication unit C1, or the signal transmission direction of the first whisper wireless signal connection R1 may be a signal transmission direction D2, in which the first wireless signal is transmitted from the slave wireless communication unit C1 to the master wireless communication unit CM, as shown in FIG.

[0029] In one embodiment, the signal transmission direction of the second whisper wireless signal connection R2 may be a signal transmission direction D2, and the second wireless signal is transmitted from the slave wireless communication unit C1 to the next adjacent slave wireless communication unit C2. Alternatively, the signal transmission direction of the first whisper wireless signal connection R1 may be a signal transmission direction D2, and the second wireless signal is transmitted from the slave wireless communication unit C2 to the slave wireless communication unit C1, and then transmitted from the slave wireless communication unit C1 to the slave wireless communication units (C2, C3, ..., Cn) in order, forming a daisy-chain communication path architecture, as shown in Figures 3 and 4.

[0030] In one embodiment, the initial level may be a preset high signal strength, and the signal strength of the first or second wireless signal is decreased by gradually adjusting the level to reach the preset value. Alternatively, the initial level may be a preset low signal strength, and the signal strength of the first or second wireless signal is increased by gradually adjusting the level to reach the preset value. Alternatively, the initial level may be a preset high signal-to-noise ratio, and the signal-to-noise ratio of the first or second wireless signal is decreased by gradually adjusting the level to reach the preset value. Alternatively, the initial level may be a preset low signal-to-noise ratio, and the signal-to-noise ratio of the first or second wireless signal is decreased by gradually adjusting the level to reach the preset value.

[0031] According to the above embodiment, the battery system 100 and its battery wireless communication system CMS employ a wireless communication unit to transmit commands and monitor information. The monitoring chips 50 connected to these battery units 10 are connected to each other via short-range coupling using the wireless communication unit to establish radio frequency whisper communication. Compared to conventional wireless broadcast technology, the above embodiment of the present disclosure can reduce network collisions and the impact of airborne jamming signals, thereby enabling safe and stable communication between the battery units 10. Furthermore, the low signal strength of the radio frequency whisper communication allows the position and order of each transmission within the battery system 100 to be individually identified, improving assembly and maintenance convenience. In addition, the first whisper wireless communication line R1 and the second whisper wireless communication line R2 of the wireless communication unit are not directly connected. The air medium can withstand the high voltage difference accumulated when the battery units 10 are connected in series, improving operational safety.

[0032] The above disclosure provides different features of several embodiments or examples for implementing the present disclosure. Descriptions of specific examples of components and configurations (e.g., referenced numerical values ​​or names) are intended to simplify / illustrate several embodiments of the present disclosure. Of course, these components and configurations are merely examples and are not intended to be limiting. Also, several embodiments of the present disclosure may have overlapping reference numerals and / or letters in various examples. This overlap is for the purpose of brevity and clarity and does not, in itself, indicate a relationship between the various embodiments and / or implementations described.

[0033] In summary, the present disclosure has been disclosed above through examples, but they are not intended to limit the present disclosure. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the protection scope of the present disclosure is defined by the appended claims. [Explanation of symbols]

[0034] 10: Battery unit 20: Control unit 30: Capacitor 40t, 40r: Communication unit 50: Monitoring chip 60: Area 100: Battery System CMS: Battery Wireless Communication System CM: Main radio communication unit C1, C2, ... Cn: Slave wireless communication units C11, C21: First wireless communication line C12, C22: Second wireless communication line L1, L2, L3: Distance R1: First whisper radio signal connection R2: Second whisper radio signal connection D1, D2: Signal transmission direction

Claims

1. a control unit; a main wireless communication unit installed in the control unit; at least one monitoring chip connected to the at least one battery unit; at least one slave wireless communication unit installed adjacent to the at least one monitoring chip, the at least one slave wireless communication unit having a one-to-one corresponding installation architecture with the at least one monitoring chip; A battery wireless communication system in which a whisper wireless signal connection is established between the master wireless communication unit and the at least one adjacent slave wireless communication unit, or between the at least one slave wireless communication unit and itself, using a whisper communication method.

2. 2. The battery wireless communication system according to claim 1, wherein the number of the at least one monitoring chip is plural, the number of the at least one battery unit is plural, and the number of the at least one slave wireless communication unit is plural, each monitoring chip is installed to be connected to one of the battery units, and each of the slave wireless communication units is installed to be connected to an adjacent monitoring chip, a first whisper wireless signal connection is established between the master wireless communication unit and the adjacent slave wireless communication unit, and a second whisper wireless signal connection is established between two adjacent slave wireless communication units by the whisper communication method, and the first whisper wireless signal connection and the second whisper wireless signal connection are a one-to-one wireless communication connection architecture and form a daisy chain communication path.

3. 3. The battery wireless communication system of claim 2, wherein the whisper communication method includes the master wireless communication unit transmitting a first wireless signal based on an initial level and gradually adjusting the level to limit the number of slave wireless communication units that respond to the first wireless signal until a set value is reached, thereby establishing only one first whisper wireless signal connection between the master wireless communication unit and an adjacent slave wireless communication unit.

4. 4. The battery wireless communication system according to claim 3, wherein the whisper communication method includes one of the slave wireless communication units transmitting a second wireless signal based on the initial level, and gradually adjusting the level to limit the number of remaining slave wireless communication units responding to the second wireless signal until the set value is reached, thereby establishing only the second whisper wireless signal connection between two adjacent slave wireless communication units.

5. 5. The battery wireless communication system according to claim 4, wherein the initial level is a preset high signal strength, and the signal strength of the first wireless signal or the second wireless signal is gradually reduced to reach the preset value.

6. 5. The battery wireless communication system according to claim 4, wherein the initial level is a preset low signal strength, and the signal strength of the first wireless signal or the second wireless signal is increased by gradually increasing the level to reach the preset value.

7. 5. The battery wireless communication system according to claim 4, wherein the initial level is a preset high signal-to-noise ratio, and the level is gradually decreased to decrease the signal-to-noise ratio of the first wireless signal or the second wireless signal so as to reach the preset value.

8. 5. The battery wireless communication system of claim 4, wherein the initial level is a preset low signal-to-noise ratio, and the level is gradually increased to increase the signal-to-noise ratio of the first wireless signal or the second wireless signal so as to reach the preset value.

9. 3. The battery wireless communication system of claim 2, wherein the master wireless communication unit and the adjacent slave wireless communication unit establish the first whisper wireless signal connection using the whisper communication method, and the distance between the master wireless communication unit and an adjacent one of these slave wireless communication units is shorter than the distance between the master wireless communication unit and another one of these slave wireless communication units.

10. 3. The battery wireless communication system according to claim 2, wherein the second whisper wireless signal connection is established between two adjacent ones of the slave wireless communication units by the whisper communication method, and the distance between the two adjacent ones of the slave wireless communication units is shorter than the distance between two non-adjacent ones of the slave wireless communication units.

11. at least one battery unit; A battery wireless communication system, a control unit; a main wireless communication unit installed in the control unit; At least one monitoring chip, the at least one monitoring chip connected to the at least one battery unit; at least one slave wireless communication unit installed adjacent to the at least one monitoring chip, the at least one slave wireless communication unit being arranged in a one-to-one correspondence with the at least one monitoring chip; A battery system including a battery wireless communication system that establishes a whisper wireless signal connection between the master wireless communication unit and two adjacent ones of the at least one slave wireless communication unit by a whisper communication method.

12. 12. The battery system according to claim 11, wherein the number of the at least one monitoring chip is plural, the number of the at least one battery unit is plural, and the number of the at least one slave wireless communication unit is plural, each monitoring chip is connected to one of the battery units, and the slave wireless communication units are respectively installed to be connected to their adjacent monitoring chips, a first whisper wireless signal connection is established between the master wireless communication unit and the adjacent slave wireless communication unit by the whisper communication method, and a second whisper wireless signal connection is established between two adjacent slave wireless communication units by the whisper communication method, and the first whisper wireless signal connection and the second whisper wireless signal connection are a one-to-one wireless communication architecture and form a daisy-chain communication path.

13. 13. The battery system of claim 12, wherein the whisper communication method includes the master wireless communication unit transmitting a first wireless signal based on an initial level and gradually adjusting the level to limit the number of slave wireless communication units that respond to the first wireless signal until a set value is reached, thereby establishing only one first whisper wireless signal connection between the master wireless communication unit and an adjacent slave wireless communication unit.

14. 14. The battery system of claim 13, wherein the whisper communication method includes one of the slave wireless communication units transmitting a second wireless signal based on the initial level, and gradually adjusting the level to limit the number of remaining slave wireless communication units responding to the second wireless signal until the set value is reached, thereby establishing only the second whisper wireless signal connection between adjacent two of the slave wireless communication units.

15. 15. The battery system of claim 14, wherein the initial level is a preset high signal strength, and the signal strength of the first wireless signal or the second wireless signal is decreased by gradually decreasing the level to reach the set value, or the initial level is a preset low signal strength, and the signal strength of the first wireless signal or the second wireless signal is increased by gradually increasing the level to reach the set value.

16. 15. The battery system of claim 14, wherein the initial level is a preset high signal-to-noise ratio, and the level is gradually decreased to decrease the signal-to-noise ratio of the first wireless signal or the second wireless signal so as to reach the set value, or the initial level is a preset low signal-to-noise ratio, and the level is gradually increased to increase the signal-to-noise ratio of the first wireless signal or the second wireless signal so as to reach the set value.

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