Battery charging and discharging device and method

Abstract

The present invention provides a battery charging and discharging device and method. The device includes: a temperature sensor for detecting the battery temperature; a charging circuit connected to the power input end of the battery, for starting to charge the battery in response to a charging signal, and determining the charging current according to the charging current control value; a discharging circuit connected to the power output end of the battery, for determining the discharging current according to the discharging current control value; a controller connected to the temperature sensor, the charging circuit and the discharging circuit and configured to: obtain the remaining life of the battery; determine the charging and discharging temperature range according to the remaining life; determine the charging current control value and the discharging current control value according to the remaining life; and when it is determined that the battery temperature is within the charging temperature range, send a charging signal and a charging current control value to the charging circuit, or when it is determined that the battery temperature is within the discharging temperature range, send a discharging signal to the battery and send a discharging current control value to the discharging circuit.

Description

Technical Field

[0001] The present invention mainly relates to the field of battery charging and discharging, and in particular to a battery charging and discharging device and method. Background Art

[0002] Storage batteries (also called rechargeable batteries or secondary batteries) have been widely used in various fields of production and life. At present, battery life is an important indicator to measure battery performance. In addition to the characteristics of the battery itself, battery life is also closely related to the charging and discharging of the battery during use.

[0003] Some battery charging and discharging methods known to the inventor alleviate damage to the battery by restricting the voltage and / or current during the charging and discharging process, thereby extending the battery life. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a battery charging and discharging device and method, which can further extend the battery life.

[0005] In order to solve the above technical problems, the present invention provides a battery charging and discharging device, comprising: a temperature sensor for detecting the battery temperature; a charging circuit connected to the power input end of the battery, for starting to charge the battery in response to a charging signal, and determining the charging current according to a charging current control value; a discharging circuit connected to the power output end of the battery, for determining the discharging current according to a discharging current control value; a controller connected to the temperature sensor, the charging circuit and the discharging circuit, the controller being configured to: obtain the remaining life of the battery; determine the lower limit value of the battery charging start temperature, the upper limit value of the battery charging start temperature, the lower limit value of the battery discharging start temperature and the upper limit value of the battery discharging start temperature according to the remaining life, wherein the lower the remaining life, the lower the battery charging start temperature. , the higher the lower limit value of the battery charge start temperature and the lower limit value of the battery discharge start temperature, the lower the upper limit value of the battery charge start temperature and the upper limit value of the battery discharge start temperature; determine the charging current control value and the discharging current control value according to the remaining life, wherein the lower the remaining life, the lower the charging current control value and the discharging current control value; and when it is judged that the battery temperature is between the lower limit value of the charge start temperature and the upper limit value of the charge start temperature, send the charging signal and the charging current control value to the charging circuit, or when it is judged that the battery temperature is between the lower limit value of the discharge start temperature and the upper limit value of the discharge start temperature, send a discharge signal to the battery, and send the discharge current control value to the discharge circuit.

[0006] Optionally, the battery charging and discharging device also includes a heating control circuit connected to the battery's heater, for turning on the heater in response to a heating signal; the controller is also configured to send the heating signal when it is determined that the battery temperature is lower than the lower limit of the charging start temperature.

[0007] Optionally, the controller is further configured to: determine a temperature for starting battery heating according to the remaining life; and send the heating signal when it is determined that the battery temperature reaches the temperature for starting battery heating.

[0008] Optionally, the battery charging and discharging device also includes a feedback circuit, which is connected to the power input terminal and the power output terminal of the battery to detect the battery voltage and feed it back to the controller, and the controller is configured to obtain the remaining life of the battery in the following manner: obtaining the battery starting charging temperature, charging current, charging time and charging voltage change; calculating the charging life coefficient of the battery according to the battery starting charging temperature, charging current, charging time and charging voltage change; obtaining the battery starting discharge temperature, discharge current, discharge time and discharge voltage change; calculating the discharge life coefficient of the battery according to the battery starting discharge temperature, discharge current, discharge time and discharge voltage change; and calculating the remaining life of the battery according to the charging life coefficient and the discharge life coefficient.

[0009] Optionally, the controller is configured to obtain the charging voltage change in the following manner: obtaining the ideal voltage change and the actual voltage change during the charging time; calculating the difference between the ideal voltage change and the actual voltage change as the charging voltage change; the controller is configured to obtain the discharging voltage change in the following manner: obtaining the ideal voltage change and the actual voltage change during the discharging time; calculating the difference between the ideal voltage change and the actual voltage change as the discharging voltage change.

[0010] Optionally, in the process of obtaining the remaining life of the battery, the battery starting charging temperature, charging current, charging time and charging voltage change at multiple time points are obtained, and the battery starting discharging temperature, discharging current, discharging time and discharging voltage change at multiple time points are obtained.

[0011] Optionally, the calculation formulas for determining the lower limit value of the battery charging start temperature, the upper limit value of the battery charging start temperature, the lower limit value of the battery discharging start temperature and the upper limit value of the battery discharging start temperature according to the remaining life are respectively:

[0012] Battery charging start temperature lower limit = 0 + (1-remaining life) * 5 / 10%;

[0013] Battery charging temperature upper limit = 55-(1-remaining life)*5 / 10%;

[0014] Battery discharge start temperature lower limit = 0 + (1-remaining life) * 5 / 10%;

[0015] The upper limit of battery discharge start temperature = 55-(1-remaining life)*5 / 10%.

[0016] Optionally, the calculation formulas for determining the charging current control value and the discharging current control value according to the remaining life are respectively:

[0017] V R1 =0.5+0.1*(1-remaining life)*5 / 10%;

[0018] V R2 =1.28+0.1*(1-remaining life)*5 / 10%;

[0019] Where V R1 is the charging current control value, V R2 is the discharge current control value.

[0020] Optionally, a calculation formula for determining a temperature for starting battery heating according to the remaining life is:

[0021] The temperature for turning on battery heating = -15 + (1 - remaining life) * 5 / 10%.

[0022] The present application also proposes a photovoltaic tracking bracket system, comprising a battery charging and discharging device as described in any of the above items.

[0023] The present application also proposes a battery charging and discharging method, comprising: obtaining the remaining life of the battery; determining the lower limit value of the battery start charging temperature, the upper limit value of the battery start charging temperature, the lower limit value of the battery start discharging temperature and the upper limit value of the battery start discharging temperature according to the remaining life, wherein the lower the remaining life, the higher the lower limit value of the battery start charging temperature and the lower limit value of the battery start discharging temperature, and the lower the upper limit value of the battery start charging temperature and the upper limit value of the battery start discharging temperature; determining a charging current control value and a discharging current control value according to the remaining life, wherein the lower the remaining life, the lower the charging current control value and the discharging current control value; and when it is judged that the battery temperature is between the lower limit value of the start charging temperature and the upper limit value of the start charging temperature, sending the charging signal and the charging current control value to the charging circuit of the battery, or when it is judged that the battery temperature is between the lower limit value of the start discharging temperature and the upper limit value of the start discharging temperature, sending a discharging signal to the battery and sending the discharging current control value to the discharging circuit of the battery.

[0024] Compared with the prior art, the present application dynamically adjusts the lower and upper temperature limits of charging and discharging according to the remaining life of the battery, and can charge and discharge within a more suitable temperature range after the battery decays, thereby protecting the battery and extending the battery life. In addition, the charging current and discharging current are dynamically adjusted according to the remaining life of the battery, and can charge and discharge with lower charging current and discharging current after the battery decays, avoiding overcharging or over-discharging, and also extending the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the present application. They are included and constitute a part of the present application. The accompanying drawings illustrate embodiments of the present application and together with the present specification serve to explain the principles of the present invention. In the accompanying drawings:

[0026] Figure 1 It is a structural block diagram of the battery charging and discharging device of the first embodiment of the present application.

[0027] Figure 2 It is a structural block diagram of a battery charging and discharging device according to the second embodiment of the present application.

[0028] Figure 3 It is a structural block diagram of a battery charging and discharging device according to the third embodiment of the present application.

[0029] Figure 4 , Figure 5 It is an exemplary circuit diagram of a battery charging and discharging device according to the third embodiment of the present application.

[0030] Figure 6 is a schematic diagram of a battery charging curve according to an embodiment of the present application.

[0031] Figure 7 is a schematic diagram of a battery charging curve according to an embodiment of the present application.

[0032] Figure 8 It is a flow chart of a battery charging and discharging method according to an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0034] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0035] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0036] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0037] It should be understood that when a component is referred to as being "on another component," "connected to another component," "coupled to another component," or "contacting another component," it may be directly on, connected to, coupled to, or contacting the other component, or there may be intervening components. In contrast, when a component is referred to as being "directly on another component," "directly connected to," "directly coupled to," or "directly contacting" another component, there are no intervening components. Similarly, when a first component is referred to as being "electrically in contact with" or "electrically coupled to" a second component, there is an electrical path between the first component and the second component that allows current to flow. The electrical path may include capacitors, coupled inductors, and / or other components that allow current to flow, even without direct contact between conductive components.

[0038] The embodiments of the present application describe a battery charging and discharging device and method, which can better extend the battery life. The inventors of the present application have found that maintaining fixed charging and discharging conditions during the battery life cycle may reduce the battery life. For example, when the battery life has decayed, if the charging current, discharging current, charging temperature range, and discharging temperature range are maintained at the same level as a new battery, it is easy to cause overcharging or discharging. Based on this, according to the embodiments of the present application, the remaining battery life is first obtained, and then the charging and discharging conditions of the battery are adjusted according to the remaining life. Further details of the present application will be described in the embodiments described later.

[0039] Embodiment 1

[0040] Figure 1 1 is a structural block diagram of a battery charging and discharging device according to the first embodiment of the present application. Figure 1 As shown, the battery charging and discharging device 10 of this embodiment is suitable for charging and discharging the battery 20. The charging and discharging device 10 includes a temperature sensor 11, a controller 12, a charging circuit 13 and a discharging circuit 14. The temperature sensor 11 is used to detect the battery temperature. For this purpose, the temperature sensor 11 can be arranged inside the battery. The controller 12 is connected to the temperature sensor 11, the charging circuit 13 and the discharging circuit 14, and is used to judge the timing of charging or discharging the battery according to the battery temperature detected by the temperature sensor 11, and send a charging signal and a discharging signal. In some embodiments, the controller 12 receives an external charging or discharging instruction, and charges or discharges when it is judged that the timing of charging or discharging has been reached. The charging circuit 13 is connected to the power input terminal of the battery 20, and is used to start charging the battery 20 in response to the charging signal. The discharging circuit 14 is connected to the power output terminal of the battery 20, and is used to discharge the battery 20. Here, the power input terminal and the power output terminal of the battery 20 can be the same terminal or the same group of terminals. These terminals serve as the power input terminal when charging, and as the power output terminal when discharging.

[0041] In this embodiment, the charging current of the charging circuit 13 can be configured according to the charging current control value; similarly, the discharging current of the discharging circuit 14 can be configured according to the discharging current control value. Both the charging current control value and the discharging current control value are provided by the controller 12.

[0042] In one embodiment, the controller 12 is configured to obtain the remaining life of the battery, and determine the lower limit value of the battery start charging temperature, the upper limit value of the battery start charging temperature, the lower limit value of the battery start discharging temperature, and the upper limit value of the battery start discharging temperature according to the remaining life. The lower limit value of the battery start charging temperature and the lower limit value of the battery start discharging temperature determine the lowest temperature at which the battery starts charging or discharging. Here, the lower the remaining life, the higher the lower limit value of the battery start charging temperature and the lower limit value of the battery start discharging temperature. The upper limit value of the battery start charging temperature and the upper limit value of the battery start discharging temperature are the highest temperatures at which the battery starts charging or discharging. Here, the lower the remaining life, the lower the upper limit value of the battery start charging temperature and the upper limit value of the battery start discharging temperature. As an example:

[0043] Battery charging start temperature lower limit = 0 + (1-remaining life) * 5 / 10%;

[0044] Battery charging temperature upper limit = 55-(1-remaining life)*5 / 10%;

[0045] Battery discharge start temperature lower limit = 0 + (1-remaining life) * 5 / 10%;

[0046] The upper limit of battery discharge start temperature = 55-(1-remaining life)*5 / 10%.

[0047] Here, the remaining life is a value between 0 and 1. The temperature is in degrees Celsius.

[0048] In one embodiment, the controller 12 is configured to determine the charging current control value and the discharging current control value according to the remaining life. Here, the lower the remaining life, the lower the charging current control value and the discharging current control value. As an example:

[0049] V R1 =0.5+0.1*(1-remaining life)*5 / 10%;

[0050] V R2 =1.28+0.1*(1-remaining life)*5 / 10%;

[0051] Where V R1 is the charging current control value, V R2 is the discharge current control value.

[0052] The controller 12 can obtain the remaining life of the battery every other period (e.g., one month), and determine the aforementioned upper and lower temperature limits, as well as the charging current control value and the discharging current control value accordingly. The remaining life of the battery can be obtained in various known ways. The controller 12 can also adjust the battery charging and discharging strategy every time the remaining life of the battery decreases by a certain amount (e.g., 10%).

[0053] When charging or discharging is required, the controller 12 obtains a battery judgment from the temperature sensor 11 and compares the battery temperature with the aforementioned upper and lower temperature limits. When the controller 12 determines that the battery temperature is between the lower limit value of the start charging temperature and the upper limit value of the start charging temperature, the controller 12 sends a charging signal and a charging current control value to the charging circuit 13. Alternatively, when the controller 12 determines that the battery temperature is between the lower limit value of the start discharging temperature and the upper limit value of the start discharging temperature, a discharge signal is sent to the battery 20, and a discharge current control value is sent to the discharge circuit 14. Here, the battery management module inside the battery 20 can allow discharge through the discharge circuit 14 in response to the discharge signal.

[0054] Through this embodiment, the lower and upper temperature limits of charging and discharging are dynamically adjusted according to the remaining life of the battery, so that the battery can be charged and discharged within a more suitable temperature range after the battery decays, thereby protecting the battery and extending the battery life. In addition, the charging current and discharging current are dynamically adjusted according to the remaining life of the battery, so that the battery can be charged and discharged with a lower charging current and discharging current after the battery decays, avoiding overcharging or over-discharging, and also extending the battery life.

[0055] Embodiment 2

[0056] Figure 2 : is a structural block diagram of a battery charging and discharging device according to a second embodiment of the present application. Figure 2 As shown, the battery charging and discharging device 10' of this embodiment is different from the previous embodiment in that it also includes a heating control circuit 15, which is suitable for connecting the heater of the battery 20 and is used to turn on the heater in response to a heating signal. The heating signal is provided by the controller 12. The controller 12 is configured to obtain the battery temperature from the temperature sensor 11, and when it is determined that the battery temperature is lower than the lower limit of the start charging temperature, it sends a heating signal. After a period of heating, when the battery temperature reaches the lower limit of the start charging temperature, the controller 12 will control the charging circuit 13 to start charging the battery 20.

[0057] In one embodiment, the controller 12 is further configured to determine the temperature for starting battery heating according to the remaining battery life. As an example, the calculation formula is:

[0058] Temperature to turn on battery heating = -15 + (1-remaining life) * 5 / 10%

[0059] Here, the lower the remaining battery life, the higher the temperature at which the battery heating is turned on.

[0060] Through this embodiment, the temperature for starting battery heating is dynamically adjusted according to the remaining battery life, and heating can be started at a higher temperature after the battery decays, thereby protecting the battery and extending the battery life.

[0061] Embodiment 3

[0062] Figure 3 : is a structural block diagram of a battery charging and discharging device according to the third embodiment of the present application. Figure 3 As shown, the battery charging and discharging device 10" of this embodiment is different from the previous embodiment in that it also includes a feedback circuit 16, which is connected to the power input terminal and the power output terminal of the battery 20 to detect the battery voltage and feed it back to the controller 12.

[0063] The controller 12 is configured to obtain the remaining life of the battery in the following manner. First, the battery charging start temperature, charging current, charging time and charging voltage change are obtained. Here, the controller 12 can obtain the charging start temperature, charging current and charging time each time charging. For the charging voltage change, the ideal voltage change and the actual voltage change within the charging time can be obtained, and then the difference between the two can be calculated as the charging voltage change. Afterwards, the charging life coefficient of the battery is calculated based on the battery charging start temperature, charging current, charging time and charging voltage change.

[0064] Preferably, the battery charging start temperature, charging current, charging time and charging voltage change at multiple time points are obtained, and the battery discharging start temperature, discharging current, discharging time and discharging voltage change at multiple time points are obtained.

[0065] For example, for Day 1, the initial charging temperature |T 1 |, initial charging current I 1 Under the condition that the charging time is from Tx to Ty, the ideal voltage change (V TyL -V TxL )-actual voltage change (V TyS -V TxS )|=Day1 charging voltage change△V 1 . Figure 6 An exemplary charging curve is shown, showing the ideal voltage change curve and the actual voltage change curve. Similarly, the daily charging voltage change △V within 30 days can be obtained 1 ~△V 30 Calculate the charge life coefficient C from this cha .

[0066] C cha =(|T 1 |*I 1 *ΔV 1 +…+|T 30 |*I 30 *ΔV 30 ) / (|T 1 |*I 1 +…+|T 30 |*I 30 )

[0067] Similarly, the battery start discharge temperature, discharge current, discharge time and discharge voltage change are obtained. Here, the controller 12 can obtain the start discharge temperature, discharge current and discharge time each time the discharge is performed. For the discharge voltage change, the ideal voltage change and the actual voltage change within the discharge time can be obtained, and then the difference between the two can be calculated as the discharge voltage change. Afterwards, the discharge life coefficient of the battery is calculated based on the battery start discharge temperature, discharge current, discharge time and discharge voltage change.

[0068] For example, on a certain day Day1, the initial discharge temperature |T 1 '|, initial charging current I 1 ', the discharge time is from Ty' to Tx', | ideal voltage change (V TyL’ -V TxL’ )-actual voltage change (V TyS’ -V TxS’ )|=Day1 charging voltage change△V 1’ . Figure 7 An exemplary discharge curve is shown, showing the ideal voltage change curve and the actual voltage change curve. Similarly, the discharge voltage change △V per day within 30 days can be obtained 1’ ~△V 30’ . The discharge life coefficient C is calculated from this dis .

[0069] C dis =(|T 1’ |*I 1’ *ΔV 1’ +…+|T 30’ |*I 30’ *ΔV 30’ ) / (|T 1’ |*I 1’ +…+|T 30’ |*I 30’ )

[0070] Finally, the remaining life of the battery is calculated based on the charging life coefficient and the discharging life coefficient. For example, when the charging life coefficient and the discharging life coefficient are both 2, it is considered that the battery 20 has decayed too much and cannot be used. Here, the remaining life is defined as 1-(C dis +C dis ) / 4.

[0071] Through the method of this embodiment, the remaining battery life can be obtained regularly as a basis for adjusting the charging and discharging strategy.

[0072] Embodiment 4

[0073] Figure 4 , Figure 5is an exemplary circuit diagram of a battery charging and discharging device according to a third embodiment of the present application. Figure 4 and Figure 5 As shown, the controller 12 can be implemented as a single chip microcomputer, which detects the voltage UT on the thermistor P3 as the temperature sensor 11, so as to determine whether the current battery temperature is suitable for starting charging. If charging cannot be started, the controller 12 will output a high level of K2 to drive the MOS tube Q3 in the heating control circuit 15 to turn on, so that a large current flows through the heating film P2 in the battery as a heater, so that the battery is heated, so that the battery temperature reaches the lower limit threshold for starting charging. At the same time, the controller 12 outputs an analog voltage value V according to the current battery temperature. R1 As the charging current control value, it is given to the adjustable resistor R1, so that the adjustable resistor R1 is fixed to a resistance value, thereby determining the charging current I of the charging chip U1 in the charging circuit 1 When charging can be started, the controller 12 outputs a low level K1 to drive the transistor Q2 to turn off, so that the enable pin EN of the charging chip U1 is at a high level, so that the charging chip U1 starts charging.

[0074] On the other hand, the controller 12 detects the voltage UT on the thermistor P3 to determine whether the current battery temperature can start discharging. At the same time, the controller 12 outputs an analog voltage value V according to the current battery temperature. R2 As the discharge current control value, the adjustable resistor R2 is given to fix the adjustable resistor R2 to a resistance value, thereby determining the discharge current I of the battery 1’ When the discharge can be started, the controller 12 outputs a low level VOK to the battery 20, for example, a battery management module, so that the battery management module obtains a discharge instruction, thereby starting the discharge of the battery.

[0075] Moreover, when the battery starts charging or discharging, the battery voltage is fed back to the detection pin of the controller 12 by a weak voltage VBACK obtained through the feedback circuit 16 composed of resistors R6 and R7. The controller 12 detects the pin in real time to obtain the battery voltage. The controller 12 also collects the current starting charge and discharge temperature T 1 / T 1’ , charge / discharge current I 1 / I 1’ The battery voltage change within a period of time is compared with the ideal change written into the controller 12. Figure 6 Shown is T 1 Starting temperature, charging starting current I 1 The following is a graph showing the battery charging voltage changes. Figure 7 Shown is T 1’ Starting temperature, discharge starting current I 1’ The following is a graph showing the battery discharge voltage changes. Figure 6-7The horizontal axis is time, and the vertical axis is battery voltage. 1 to 10 During a period of time, there is a difference between the actual voltage change and the ideal voltage change, and the appearance of this difference is a manifestation of battery life degradation.

[0076] Referring to the third embodiment, various temperature limits and charge and discharge current control values ​​may be calculated according to the remaining life of the battery.

[0077] Further, adjustable resistance R1 = 2*V R1 , I 1 =1 / R1. Similarly, adjustable resistor R2 = 2*V R2 , I1' = current battery voltage / R2.

[0078] Embodiment 5

[0079] Figure 6 This is a battery charging and discharging method according to an embodiment of the present application. Figure 6 As shown, from another perspective, the charging and discharging method of the present application includes the following steps.

[0080] In step 601, the remaining life of the battery is obtained.

[0081] In step 602, the battery charging start temperature lower limit value, the battery charging start temperature upper limit value, the battery discharging start temperature lower limit value and the battery discharging start temperature upper limit value are determined according to the remaining life, wherein the lower the remaining life, the higher the battery charging start temperature lower limit value and the battery discharging start temperature lower limit value, and the lower the battery charging start temperature upper limit value and the battery discharging start temperature upper limit value.

[0082] In step 603, a charge current control value and a discharge current control value are determined according to the remaining life, wherein the lower the remaining life, the lower the charge current control value and the discharge current control value.

[0083] In step 604, when it is determined that the battery temperature is between the lower limit value of the start charging temperature and the upper limit value of the start charging temperature, a charging signal and a charging current control value are sent to the charging circuit of the battery, or when it is detected that the battery temperature is between the lower limit value of the start discharging temperature and the upper limit value of the start discharging temperature, a discharging signal is sent to the battery, and a discharging current control value is sent to the discharge circuit of the battery.

[0084] The method of this embodiment may be implemented in the aforementioned controller, and may be implemented as a computer program.

[0085] Flowcharts are used in the present application to illustrate the operations performed by the system according to the embodiments of the present application. It should be understood that the preceding or following operations are not necessarily performed accurately in order. On the contrary, various steps may be processed in reverse order or simultaneously. At the same time, other operations may be added to these processes, or one or more operations may be removed from these processes.

[0086] The present application also provides a photovoltaic tracking bracket system, which includes a tracking bracket, a tracking motor, a network controller, and a motor controller. The motor controller contains a large-capacity battery so that when there is no external power input to the motor controller at night, the motor controller is powered from the inside to maintain communication and motor drive operations. The photovoltaic tracking bracket system also includes the aforementioned charging and discharging device for charging and discharging the large-capacity battery.

[0087] The basic concepts have been described above. Obviously, for those skilled in the art, the above invention disclosure is only used as an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0088] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0089] Some aspects of the present application may be performed entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. The above hardware or software may be referred to as "data blocks", "modules", "engines", "units", "components" or "systems". The processor may be one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DAPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, or combinations thereof. In addition, various aspects of the present application may be expressed as computer products located in one or more computer-readable media, which include computer-readable program codes. For example, computer-readable media may include, but are not limited to, magnetic storage devices (e.g., hard disks, floppy disks, tapes ...), optical disks (e.g., compact disks CDs, digital versatile disks DVDs ...), smart cards, and flash memory devices (e.g., cards, sticks, key drives ...).

[0090] A computer-readable medium may include a propagated data signal containing computer program code, such as in baseband or as part of a carrier wave. The propagated signal may have a variety of manifestations, including electromagnetic, optical, etc., or a suitable combination. A computer-readable medium may be any computer-readable medium other than a computer-readable storage medium, which may be connected to an instruction execution system, device or apparatus to communicate, propagate or transmit a program for use. The program code on the computer-readable medium may be propagated via any suitable medium, including radio, cable, fiber optic cable, radio frequency signal, or similar medium, or any combination of the above mediums.

[0091] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0092] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0093] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A battery charging and discharging device, comprising: Temperature sensor, used to detect battery temperature; a charging circuit, connected to a power input terminal of the battery, for starting to charge the battery in response to a charging signal, and determining a charging current according to a charging current control value; A discharge circuit, connected to the power output terminal of the battery, and used to determine the discharge current according to the discharge current control value; A controller is connected to the temperature sensor, the charging circuit and the discharging circuit, and the controller is configured as follows: Obtaining the remaining life of the battery; determining a battery charge start temperature lower limit value, a battery charge start temperature upper limit value, a battery discharge start temperature lower limit value, and a battery discharge start temperature upper limit value according to the remaining life, wherein the lower the remaining life, the higher the battery charge start temperature lower limit value and the battery discharge start temperature lower limit value, and the lower the battery charge start temperature upper limit value and the battery discharge start temperature upper limit value; determining the charge current control value and the discharge current control value according to the remaining life, wherein the lower the remaining life, the lower the charge current control value and the discharge current control value; as well as When it is determined that the battery temperature is between the lower limit value of the start charging temperature and the upper limit value of the start charging temperature, the charging signal and the charging current control value are sent to the charging circuit, or when it is determined that the battery temperature is between the lower limit value of the start discharging temperature and the upper limit value of the start discharging temperature, a discharging signal is sent to the battery and the discharging current control value is sent to the discharging circuit.

2. The battery charging and discharging device according to claim 1, characterized in that: It also includes a heating control circuit connected to the heater of the battery and used to turn on the heater in response to a heating signal; the controller is also configured to send the heating signal when it is determined that the battery temperature is lower than the lower limit of the starting charging temperature.

3. The battery charging and discharging device according to claim 2, characterized in that: The controller is also configured to: Determining a temperature for starting battery heating according to the remaining life; The heating signal is sent when it is determined that the battery temperature reaches a temperature for starting battery heating.

4. The battery charging and discharging device according to claim 1, characterized in that: The system further includes a feedback circuit, which is connected to the power input terminal and the power output terminal of the battery to detect the battery voltage and feed it back to the controller, wherein the controller is configured to obtain the remaining life of the battery in the following manner: Obtain the battery starting charging temperature, charging current, charging time and charging voltage change; Calculating the charging life coefficient of the battery according to the starting charging temperature, charging current, charging time and charging voltage change of the battery; Obtain the battery's discharge start temperature, discharge current, discharge time, and discharge voltage change; Calculating the discharge life coefficient of the battery according to the discharge start temperature, discharge current, discharge time and discharge voltage change of the battery; as well as The remaining life of the battery is calculated according to the charging life coefficient and the discharging life coefficient.

5. The battery charging and discharging device according to claim 4, characterized in that: The controller is configured to obtain the charging voltage variation by: obtaining the ideal voltage variation and the actual voltage variation during the charging time; calculating the difference between the ideal voltage variation and the actual voltage variation as the charging voltage variation; The controller is configured to obtain the discharge voltage variation by: obtaining the ideal voltage variation and the actual voltage variation during the discharge time; The difference between the ideal voltage variation and the actual voltage variation is calculated as the discharge voltage variation.

6. The battery charging and discharging device according to claim 4, characterized in that: In the process of obtaining the remaining life of the battery, the battery starting charging temperature, charging current, charging time and charging voltage change at multiple time points are obtained, and the battery starting discharging temperature, discharging current, discharging time and discharging voltage change at multiple time points are obtained.

7. The battery charging and discharging device according to claim 1, characterized in that: The calculation formulas for determining the lower limit value of the battery charging start temperature, the upper limit value of the battery charging start temperature, the lower limit value of the battery discharging start temperature and the upper limit value of the battery discharging start temperature according to the remaining life are respectively: Battery charging start temperature lower limit = 0 + (1-remaining life) * 5 / 10%; Battery charging temperature upper limit = 55-(1-remaining life)*5 / 10%; Battery discharge start temperature lower limit = 0 + (1-remaining life) * 5 / 10%; The upper limit of battery discharge start temperature = 55-(1-remaining life)*5 / 10%.

8. The battery charging and discharging device according to claim 1, characterized in that: The calculation formulas for determining the charging current control value and the discharging current control value according to the remaining life are respectively: V R1 =0.5+0.1*(1-remaining life)*5 / 10%; V R2 =1.28+0.1*(1-remaining life)*5 / 10%; Where V R1 is the charging current control value, V R2 is the discharge current control value.

9. The battery charging and discharging device according to claim 3, characterized in that: The calculation formula for determining the temperature for starting battery heating according to the remaining life is: The temperature for turning on battery heating = -15 + (1 - remaining life) * 5 / 10%.

10. A battery charging and discharging method, comprising: Obtaining the remaining life of the battery; determining a battery charge start temperature lower limit value, a battery charge start temperature upper limit value, a battery discharge start temperature lower limit value, and a battery discharge start temperature upper limit value according to the remaining life, wherein the lower the remaining life, the higher the battery charge start temperature lower limit value and the battery discharge start temperature lower limit value, and the lower the battery charge start temperature upper limit value and the battery discharge start temperature upper limit value; Determining a charging current control value and a discharging current control value according to the remaining life, wherein the lower the remaining life, the lower the charging current control value and the discharging current control value; as well as When it is determined that the battery temperature is between the lower limit value of the start charging temperature and the upper limit value of the start charging temperature, the charging signal and the charging current control value are sent to the charging circuit of the battery, or when it is determined that the battery temperature is between the lower limit value of the start discharging temperature and the upper limit value of the start discharging temperature, a discharging signal is sent to the battery, and the discharging current control value is sent to the discharging circuit of the battery.

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