Battery formation device, control method of battery formation device, and control system

Abstract

The present application discloses a battery formation device, a control method and a control system for the battery formation device. The battery formation device includes: a first DC-DC conversion module, an additional power supply and a control circuit; the low-voltage end of the first DC-DC conversion module is connected to the control circuit, and the high-voltage end of the first DC-DC conversion module is connected to the DC bus; when the battery cell discharges for the battery formation device, the first DC-DC conversion module converts the first voltage input at the low-voltage end into a second voltage and outputs the second voltage through the high-voltage end; the additional power supply is connected to the control circuit and is used to output an additional voltage, and the polarity of the additional power supply is the same as that of the battery cell; when the battery cell discharges for the battery formation device, the control circuit connects the low-voltage end of the first DC-DC conversion module, the battery cell and the additional power supply in series. The battery formation device in the embodiment of the present application can solve the technical problems of poor battery formation effect caused by the fact that the battery cannot be fully discharged to the battery formation device and low accuracy of the detected battery capacity.

Description

Technical Field

[0001] The present application relates to the field of batteries, and particularly to a battery formation device, a control method and a control system for the battery formation device. Background Art

[0002] Battery formation is an important process in the battery production process. Specifically, battery formation is to charge and discharge the battery by using a battery formation device, so as to achieve the purposes of improving the battery performance and detecting the battery capacity, etc.

[0003] However, when using the current battery formation device, there is a drawback that the battery cannot be fully discharged, thereby reducing the battery formation effect and the accuracy of the detected battery capacity. Summary of the Invention

[0004] In view of the above problems, the present application provides a battery formation device, a control method and a control system for the battery formation device, which can solve the technical problems of poor battery formation effect and low accuracy of the detected battery capacity caused by the inability of the battery to be fully discharged.

[0005] In a first aspect, the present application provides a battery formation device, which includes: a first DC-DC conversion module, an additional power supply and a control circuit; the low-voltage end of the first DC-DC conversion module is used for electrical connection with the control circuit, and the high-voltage end of the first DC-DC conversion module is used for electrical connection with the DC bus; the first DC-DC conversion module is used for converting the first voltage input from the low-voltage end into a second voltage when the battery cell discharges for the battery formation device, and outputting the second voltage through the high-voltage end; wherein, the second voltage is higher than the first voltage; the additional power supply is used for electrical connection with the control circuit, and the additional power supply is used for outputting an additional voltage; wherein, the polarity of the additional power supply is the same as that of the battery cell; the control circuit is used for electrical connection with the battery cell, the low-voltage end of the first DC-DC conversion module, and the additional power supply; the control circuit is used for connecting the low-voltage end of the first DC-DC conversion module, the battery cell and the additional power supply in series when the battery cell discharges for the battery formation device.

[0006] In the technical solution of the embodiment of the present application, when the battery unit discharges for the battery forming device, the control circuit connects the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in series, and the polarities of the battery unit and the additional power supply are the same. Thus, the polarities of the voltages output by the battery unit and the additional power supply are consistent, and the voltages output by the battery unit and the additional power supply are superimposed and then input to the low-voltage end of the first DC-DC conversion module, avoiding the situation where the input voltage of the first DC-DC conversion module is less than the minimum input voltage threshold of the first DC-DC conversion module. Therefore, each battery cell in the battery unit can be fully discharged, and then the technical drawbacks of poor battery forming effect and poor accuracy of the detected battery capacity caused by the inability of each battery cell in the battery unit to be fully discharged can be avoided.

[0007] In some embodiments, the control circuit is further configured to connect the low-voltage end of the first DC-DC conversion module and the battery unit in series when the battery forming device charges the battery unit. By adopting this method, on the one hand, it can avoid the influence of the additional power supply on the charging process when the battery forming device charges the battery unit; on the other hand, the additional power supply can not output voltage when the battery forming device charges the battery unit, which can reduce the overall energy consumption of the battery forming device.

[0008] In some embodiments, the device further includes a detection module. The detection module is used to be electrically connected to the battery unit and the control circuit, and the detection module is used to detect the output voltage of the battery unit. Then, the control circuit is further configured to connect the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in series when the battery unit discharges for the battery forming device and the detection module detects that the output voltage of the battery unit is less than the first voltage threshold. By adopting this method, the detection module detects the output voltage of the battery unit when the battery unit discharges. When the battery unit is in the discharge state and the output voltage of the battery unit is less than the first voltage threshold, the additional power supply is started, and the additional power supply is connected in series to the discharge circuit composed of the low-voltage end of the first DC-DC conversion module and the battery unit, further reducing the overall energy consumption of the battery forming device and reducing the forming processing cost of the battery forming device.

[0009] In some embodiments, the battery unit is single. By performing forming processing on a single battery unit through a set of charge and discharge components, it can avoid the interference of the forming process of other battery units on the forming process of this battery unit and is beneficial to improving the accuracy of the capacity detection of this battery unit.

[0010] In some embodiments, the control circuit includes a first control switch and a second control switch; a first sub-terminal of the low-voltage end of the first DC-DC conversion module is used for electrical connection with a first pole of the battery unit; a first end of the first control switch is used for electrical connection with a second sub-terminal of the low-voltage end of the first DC-DC conversion module and a first pole of the additional power supply, and a second end of the first control switch is used for electrical connection with a second pole of the battery unit and a second end of the second control switch; a first end of the second control switch is used for electrical connection with a first pole of the additional power supply; wherein, when the battery unit discharges for the battery forming device, the first end and the second end of the first control switch are not connected, and the first end and the second end of the second control switch are connected. In this way, a set of charge and discharge components corresponds to a single battery unit, and the access of the additional power supply to the charge and discharge loop is controlled by the first control switch and the second control switch, further streamlining the structure of the battery forming device and saving the forming cost.

[0011] In some embodiments, the control circuit includes a first control switch and a second control switch; a first sub-terminal of the low-voltage end of the first DC-DC conversion module is used for electrical connection with a first pole of the battery unit; a first end of the first control switch is used for electrical connection with a second sub-terminal of the low-voltage end of the first DC-DC conversion module and a first end of the second control switch, and a second end of the first control switch is used for electrical connection with a second pole of the battery unit and a first pole of the additional power supply; a second end of the second control switch is used for electrical connection with a second pole of the additional power supply; wherein, when the battery unit discharges for the battery forming device, the first end and the second end of the first control switch are not connected, and the first end and the second end of the second control switch are connected. In this way, a set of charge and discharge components corresponds to a single battery unit, and the access of the additional power supply to the charge and discharge loop is controlled by the first control switch and the second control switch, further streamlining the structure of the battery forming device and saving the forming cost.

[0012] In some embodiments, the control circuit includes a third control switch; a first sub - terminal of the low - voltage end of the first DC - DC conversion module is used for electrically connecting to a first pole of the battery unit; a first end of the third control switch is used for electrically connecting to a second sub - terminal of the low - voltage end of the first DC - DC conversion module, a second end of the third control switch is used for electrically connecting to a second pole of the battery unit and a first pole of the additional power supply, and a third end of the third control switch is used for electrically connecting to a second pole of the additional power supply; wherein, when the battery unit discharges for the battery forming device, the first end and the second end of the third control switch are not connected, and the first end and the third end of the third control switch are connected. In this way, a set of charge - discharge components corresponds to a single battery unit, and the access of the additional power supply to the charge - discharge circuit can be controlled by a single third control switch, further streamlining the structure of the battery forming device, reducing the number of components of the battery forming device, and saving the forming cost.

[0013] In some embodiments, the battery unit includes a first battery unit and a second battery unit. By using a set of charge - discharge components to perform forming processing on multiple battery units, the utilization rate of the charge - discharge components is effectively improved, and the energy consumption and cost of the battery forming device are saved.

[0014] In some embodiments, the control circuit includes a first control switch and a second control switch; a first sub - terminal of the low - voltage end of the first DC - DC conversion module is used for electrically connecting to a first pole of the first battery unit, and a second sub - terminal of the low - voltage end of the first DC - DC conversion module is used for electrically connecting to a second pole of the second battery unit; a first end of the first control switch is used for electrically connecting to a second pole of the first battery unit and a first pole of the additional power supply, a second end of the first control switch is used for electrically connecting to a first pole of the second battery unit and a second end of the second control switch; a first end of the second control switch is used for electrically connecting to a second pole of the additional power supply; wherein, when the battery unit discharges for the battery forming device, the first end and the second end of the first control switch are not connected, and the first end and the second end of the second control switch are connected. In this way, a set of charge - discharge components corresponds to the first battery unit and the second battery unit, and the access of the additional power supply to the charge - discharge circuit is controlled by the first control switch and the second control switch, streamlining the structure of the battery forming device and saving the forming cost; moreover, the first control switch and the second control switch are arranged between the two battery units, which can effectively reduce the length of the connecting wires and save the cost of the battery forming device.

[0015] In some embodiments, the control circuit includes a first control switch and a second control switch; a first sub-terminal of the low-voltage end of the first DC-DC conversion module is used for electrically connecting to a first pole of the first battery unit, and a second sub-terminal of the low-voltage end of the first DC-DC conversion module is used for electrically connecting to a second pole of the second battery unit; a first end of the first control switch is used for electrically connecting to a second pole of the first battery unit and a first end of the second control switch, and a second end of the first control switch is used for electrically connecting to a second pole of the additional power supply and a first pole of the second battery unit; a second end of the second control switch is used for electrically connecting to a first pole of the additional power supply; wherein, when the battery unit discharges for the battery forming device, a first end and a second end of the first control switch are not connected, and a first end and a second end of the second control switch are connected. By adopting this method, a set of charge and discharge components corresponds to the first battery unit and the second battery unit, and the access of the additional power supply to the charge and discharge loop is controlled by the first control switch and the second control switch, simplifying the structure of the battery forming device and saving the forming cost; moreover, the first control switch and the second control switch are arranged between the two battery units, which can effectively reduce the length of the connecting wires and save the cost of the battery forming device.

[0016] In some embodiments, the control circuit includes a third control switch; a first sub-terminal of the low-voltage end of the first DC-DC conversion module is used for electrically connecting to a first pole of the first battery unit, and a second sub-terminal of the low-voltage end of the first DC-DC conversion module is used for electrically connecting to a second pole of the second battery unit; a first end of the third control switch is used for electrically connecting to a second pole of the first battery unit, a second end of the third control switch is used for electrically connecting to a first pole of the additional power supply, and a third end of the third control switch is used for electrically connecting to a first pole of the second battery unit; wherein, when the battery unit discharges for the battery forming device, a first end and a second end of the third control switch are connected. By adopting this method, a set of charge and discharge components corresponds to the first battery unit and the second battery unit, and the access of the additional power supply to the charge and discharge loop is controlled by one control switch, further reducing the number of components included in the battery forming device and saving the forming cost; moreover, the third control switch is arranged between the two battery units, which can effectively reduce the length of the connecting wires and save the cost of the battery forming device.

[0017] In some embodiments, the additional power supply is a second DC-DC conversion module; the high-voltage end of the second DC-DC conversion module is used for electrical connection with the DC bus, and the low-voltage end of the second DC-DC conversion module is used for being connected in series with the low-voltage end of the first DC-DC conversion module and the battery unit when the battery unit discharges for the battery forming device. By adopting this method, using the second DC-DC conversion module as the additional power supply, on the one hand, when the battery unit discharges for the battery forming device, the voltage output by the low-voltage end of the second DC-DC conversion module is superimposed on the voltage output by the battery unit and then input to the low-voltage end of the first DC-DC conversion module, improving the input voltage of the first DC-DC conversion module and avoiding the drawback that the input voltage of the first DC-DC conversion module is less than the minimum input voltage threshold of the first DC-DC conversion module; on the other hand, the second DC-DC conversion module has the characteristics of low power consumption and small volume, which is beneficial to reducing the energy consumption of the battery forming device and reducing the volume of the battery forming device.

[0018] In some embodiments, the device further includes: an AC-DC conversion module; the AC end of the AC-DC conversion module is used for electrical connection with the power grid, and the DC end of the AC-DC conversion module is used for electrical connection with the DC bus; the AC-DC conversion module is configured to, when the battery unit discharges for the battery forming device, convert the DC voltage input at the DC end of the AC-DC conversion module into an AC voltage and output the AC voltage through the AC end of the AC-DC conversion module; and, the AC-DC conversion module is configured to, when the battery forming device charges the battery unit, convert the AC voltage input at the AC end of the AC-DC conversion module into a DC voltage and output the DC voltage through the DC end of the AC-DC conversion module. By adopting this method, by providing an AC-DC conversion module in the battery forming device, the alternating current of the power grid can be converted into direct current and used for charging the battery unit; the direct current output by the battery unit can also be converted into alternating current and output to the power grid, so that the battery forming device can be applied to the scenario of alternating current, expanding the usage range of the battery forming device.

[0019] In a second aspect, the present application provides a control method for the above-mentioned battery forming device, including: receiving a battery unit discharge control instruction; controlling the low-voltage end of the first DC-DC conversion module, the battery unit and the additional power supply in the battery forming device to be connected in series; and controlling the battery unit to discharge for the battery forming device.

[0020] In the technical solution of the embodiment of the present application, the battery formation device can promptly respond to the discharge control instruction issued by the master computer, and connect the additional power supply in series to the low-voltage end of the first DC-DC conversion module and the discharge loop formed by the battery unit, thereby increasing the voltage input to the first DC-DC conversion module, avoiding the situation where the input voltage of the first DC-DC conversion module is less than the minimum input voltage threshold of the first DC-DC conversion module, so that each battery cell in the battery unit can be fully discharged, and avoiding the technical drawbacks of poor formation effect of the battery unit and poor accuracy of the detected battery capacity caused by the inability of each battery cell in the battery unit to be fully discharged.

[0021] In some embodiments, the series connection of the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in the control battery formation device further includes: detecting the output voltage of the battery unit; if it is detected that the output voltage of the battery unit is less than the first voltage threshold, then controlling the series connection of the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in the battery formation device. By adopting this method, when the battery unit is in the discharge state and the output voltage of the battery unit is less than the first voltage threshold, the additional power supply is started, and the additional power supply is connected in series to the discharge loop composed of the low-voltage end of the first DC-DC conversion module and the battery unit, further reducing the overall energy consumption of the battery formation device and reducing the formation processing cost of the battery formation device.

[0022] In some embodiments, the series connection of the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in the control battery formation device when it is detected that the output voltage of the battery unit is less than the first voltage threshold further includes: if it is detected that the output voltage of the battery unit is less than the first voltage threshold, after pausing the AC-DC conversion module of the battery formation device, controlling the series connection of the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in the battery formation device; and after controlling the series connection of the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in the battery formation device, restarting the AC-DC conversion module. By adopting this method, the AC-DC conversion module is paused first to avoid the AC-DC conversion module continuously outputting high voltage to the first DC-DC conversion module via the DC bus, and then the additional power supply is connected in series to the discharge loop composed of the low-voltage end of the first DC-DC conversion module and the battery unit, avoiding a short-term peak voltage in the first DC-DC conversion module and extending the service life of the first DC-DC conversion module.

[0023] In some embodiments, the method further includes: collecting battery state information of the battery cell and feeding back the battery state information to the middle unit. By adopting the implementation manner in this embodiment, the battery state information of the battery cell is collected and fed back in real time, so as to facilitate timely discovery of the state of the battery cell during the pooling process, and is conducive to timely discovery of abnormal states and timely response to abnormal states.

[0024] In some embodiments, the method further includes: determining whether a charging duration for the battery forming device to charge the battery cell exceeds a preset duration; if so, sending an alarm message to the middle unit; and receiving an abort instruction sent by the middle unit based on the alarm message, and pausing the AC-DC conversion module in the battery forming device. By adopting this method, it is determined whether there is an abnormality in the battery cell according to the charging duration of the battery cell, and an alarm message is sent to the middle unit in time when it is determined that there is an abnormality in the battery cell, so as to facilitate the handling of the abnormality of the battery cell; and during the handling process, the output of the AC-DC conversion module is aborted, on the one hand, protecting the safety of the battery cell and the battery forming device, and on the other hand, reducing the energy consumption of the battery forming device and saving the forming cost.

[0025] In some embodiments, the method further includes: determining whether an output voltage of the battery cell exceeds a second voltage threshold; if so, sending an alarm message to the middle unit; receiving an abort instruction sent by the middle unit based on the alarm message, and pausing the output of the battery cell according to the abort instruction. By adopting this method, it is determined whether there is an abnormality according to the discharge voltage of the battery cell, and an alarm message is sent to the middle unit in time when it is determined that there is an abnormality, so as to facilitate the handling of the abnormal state; and during the handling process, the output of the battery cell is aborted, on the one hand, protecting the safety of the battery cell and the battery forming device; and on the other hand, reducing the energy consumption of the battery cell and saving the forming cost.

[0026] In a third aspect, the present application provides a battery forming control system, including: the above-mentioned battery forming device and a middle unit; the middle unit is communicatively connected to the battery forming device; the middle unit is configured to send a charging control instruction or a discharging control instruction to the battery forming device; the battery forming device is configured to control the battery cell to discharge for the battery forming device according to the discharging control instruction; or, the battery forming device is configured to control the battery forming device to charge the battery cell according to the charging control instruction.

[0027] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other objects, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically described below. Description of the Drawings

[0028] Upon reading the following detailed description of the preferred embodiments, various other advantages and benefits will become apparent to those of ordinary skill in the art. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0029] Figure 1 is a schematic structural diagram of a battery formation device in the prior art;

[0030] Figure 2 is a schematic structural diagram of a battery formation device according to some embodiments of the present application;

[0031] Figure 3 is a schematic structural diagram of a first DC-DC conversion module according to some embodiments of the present application;

[0032] Figure 4 is a schematic diagram of an equivalent circuit when a battery unit discharges for a battery formation device according to some embodiments of the present application;

[0033] Figure 5 is a schematic structural diagram of a battery formation device according to some embodiments of the present application;

[0034] Figure 6 is a schematic diagram of an equivalent circuit when a battery formation device according to some embodiments of the present application charges a battery unit;

[0035] Figure 7 is a schematic structural diagram of a battery formation device according to some embodiments of the present application;

[0036] Figure 8 is a schematic structural diagram of a battery formation device according to some embodiments of the present application;

[0037] Figure 9 is a schematic structural diagram of a battery formation device according to some embodiments of the present application;

[0038] Figure 10 is a schematic structural diagram of a battery formation device according to some embodiments of the present application;

[0039] Figure 11 is a schematic structural diagram of a battery formation device according to some embodiments of the present application;

[0040] Figure 12 is a schematic structural diagram of a battery formation device according to some embodiments of the present application;

[0041] Figure 13 is a schematic structural diagram of a battery formation device according to some embodiments of the present application;

[0042] Figure 14Schematic diagram of the battery formation device according to some embodiments of the present application;

[0043] Figure 15 Schematic diagram of the battery formation device according to some embodiments of the present application;

[0044] Figure 16 Schematic diagram of the battery formation device according to some embodiments of the present application;

[0045] Figure 17 Flow chart of the control method of the battery formation device according to some embodiments of the present application;

[0046] Figure 18 Schematic diagram of the battery formation system according to some embodiments of the present application;

[0047] The reference numerals in the detailed description are as follows:

[0048] Battery formation device 100, battery unit 200, middle unit 300, battery formation system 400;

[0049] First DC-DC conversion module 110, additional power supply 120, control circuit 130, DC bus 140, detection module 150, AC-DC conversion module 160;

[0050] Low-voltage end 111 of the first DC-DC conversion module, high-voltage end 112 of the first DC-DC conversion module;

[0051] AC end 161 of the AC-DC conversion module, DC end 162 of the AC-DC conversion module;

[0052] First battery unit 210, second battery unit 220;

[0053] First control switch 131, second control switch 132, third control switch 133. Detailed description

[0054] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0056] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0057] Referring to "embodiment" herein means that a specific feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0058] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after. In the description of the embodiments of the present application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0059] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0060] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0061] At present, with the continuous development of science and technology and society, power batteries are widely used in electric vehicles such as electric vehicles, energy storage power systems such as clean energy, and other fields. After the power battery is manufactured, it needs to be charged and discharged by a battery formation device. This process is the formation process of the power battery. The formation process of the power battery can not only activate the power battery and improve the overall performance of the power battery, but also detect the capacity of the power battery during the formation process, providing a basis for the evaluation of the power battery performance.

[0062] refer to Figure 1 The battery formation device in the prior art includes a DC-DC conversion module, which is connected in series with the battery cell. When the battery cell is in charging mode, the DC-DC conversion module will convert the voltage from the power grid into a step-down voltage and transmit it to the battery cell to charge the battery cell; when the battery cell is in discharging mode, the DC-DC conversion module will convert the output voltage of the battery cell into a step-up voltage and transmit it to the power grid.

[0063] The inventors of the present invention have noticed during the implementation that when the battery cell is in the discharge mode, that is, when the battery cell is discharged to the battery formation device, there will be a situation where some battery cells have been fully discharged, while other battery cells still retain some power. In this case, the overall output voltage of the battery cell is low, but the DC-DC conversion module has a corresponding input voltage amplitude limit. When the output voltage of the battery cell is lower than the minimum input voltage threshold of the DC-DC conversion module, the output voltage of the battery cell cannot be transmitted to the power grid via the DC-DC conversion module, resulting in some battery cells in the battery cell being unable to be fully discharged, thereby reducing the formation effect of the battery cell and reducing the capacity detection accuracy of the battery cell.

[0064] The invention aims to solve the technical problems of poor battery formation effect and low accuracy of detected battery capacity caused by the inability of battery cells to fully discharge to a battery formation device. After in-depth research, the inventor has designed a battery formation device, which increases the input voltage of the DC-DC conversion module by connecting an additional power supply with the same polarity as the battery cell in series in the loop of the DC-DC conversion module and the battery cell during the discharge process of the battery cell to the DC-DC conversion module. The battery formation device with this structure can make each battery cell of the battery cell fully discharge, thereby improving the poor battery formation effect and the accuracy of detected battery capacity.

[0065] The battery formation device disclosed in the embodiments of the present application can be used, but not limited to, in the formation process of storage batteries such as lithium-ion batteries, lead-acid batteries, and nickel-hydrogen batteries. Storage batteries are also called rechargeable batteries, secondary batteries, etc. The battery described in the embodiments of the present application specifically refers to storage batteries.

[0066] In the embodiments of the present application, the battery cell refers to a single physical module including one or more battery monomers to provide higher voltage and capacity. The number of battery monomers included in different battery cells may be the same or different. When a battery cell includes multiple battery monomers, the multiple battery monomers included in the battery cell may be connected in parallel or in series. As an optional battery monomer structure, the battery monomer includes a positive electrode plate, a negative electrode plate, an electrolyte, and a separator.

[0067] In the embodiments of the present application, the DC-DC conversion module refers to a DC-to-DC converter, and the DC-DC conversion module is used to convert electrical energy of one voltage value into electrical energy of another voltage value. The DC-DC conversion module in the embodiments of the present application includes a high-voltage terminal and a low-voltage terminal. The high-voltage terminal is used to input or output electrical energy higher than that of the low-voltage terminal, and the low-voltage terminal is used to input or output electrical energy lower than that of the high-voltage terminal.

[0068] To better understand the present application, the following Figures 1 to 18 describes the embodiments of the present application in detail.

[0069] According to some embodiments of the present application, with reference to Figure 2 、 Figure 3 and Figure 4 . Figure 2 is a schematic structural diagram of a battery formation device according to some embodiments of the present application, Figure 3 is a schematic structural diagram of a first DC-DC conversion module according to some embodiments of the present application, Figure 4 is a schematic diagram of an equivalent circuit when the battery cell of some embodiments of the present application discharges for the battery formation device.

[0070] As Figure 2 shown, the battery formation device 100 includes: a first DC-DC conversion module 110, an additional power supply 120, and a control circuit 130. The first DC-DC conversion module 110, the additional power supply 120, and the battery cell 200 are respectively used to be electrically connected to the control circuit 130. When the battery cell 200 discharges for the battery formation device 100, the control circuit 130 connects the first DC-DC conversion module 110, the battery cell 200, and the additional power supply 120 in series.

[0071] Further with reference to Figure 3, the first DC-DC conversion module 110 includes a low-voltage terminal 111 and a high-voltage terminal 112. The low-voltage terminal 111 is used for electrical connection with the control circuit 130, and the high-voltage terminal 112 is used for electrical connection with the DC bus 140. The first DC-DC conversion module 110 is configured to convert the first voltage input from the low-voltage terminal 111 into a second voltage when the battery unit 200 discharges for the battery formation device 100, and output the second voltage through the high-voltage terminal 112; wherein, the second voltage is higher than the first voltage. Thus, when the battery unit 200 discharges for the battery formation device 100, the first DC-DC conversion module 110 boosts the input voltage and then outputs it to the DC bus 140. Optionally, correspondingly, the first DC-DC conversion module 110 is also configured to step down the voltage input from the DC bus 140 to the high-voltage terminal 112 and output it from the low-voltage terminal 111 when the battery formation device 100 charges the battery unit 200.

[0072] In an alternative embodiment, the first DC-DC conversion module 110 is specifically an isolated DC-DC converter. With this structure, the input circuit and the output circuit of the first DC-DC conversion module 110 are isolated from each other and do not interfere with each other, thus streamlining the structure of the battery formation device and reducing the size and cost of the battery formation device.

[0073] Combined Figure 2 with Figure 3 , the additional power supply 120 is used for electrical connection with the control circuit 130, and the additional power supply 120 is also configured to output an additional voltage. The polarity of the additional power supply 120 is the same as that of the battery unit 200.

[0074] The control circuit 130 is specifically configured to connect the low-voltage terminal 111 of the first DC-DC conversion module, the battery unit 200, and the additional power supply 120 in series when the battery unit 200 discharges for the battery formation device 100. Refer to Figure 4 , Figure 4 is a schematic diagram of an equivalent circuit when the battery unit in some embodiments of the present application discharges for the battery formation device. As Figure 4 shown, when the battery unit 200 discharges for the battery formation device 100, the low-voltage terminal 111 of the first DC-DC conversion module, the battery unit 200, and the additional power supply 120 are connected in series. Also, since the additional power supply 120 has the same polarity as the battery unit 200, the additional power supply 120 has the same voltage polarity as the battery unit 200, and the superimposed amplitude of the voltages output by the additional power supply 120 and the battery unit 200 is equal to the sum of the voltage amplitudes output by the additional power supply 120 and the battery unit 200, thereby increasing the amplitude of the input voltage of the first DC-DC conversion module.

[0075] In this embodiment, when the battery unit discharges for the battery formation device, the control circuit connects the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in series, and the polarities of the battery unit and the additional power supply are the same. As a result, the polarities of the voltages output by the battery unit and the additional power supply are the same, thereby increasing the input voltage of the first DC-DC conversion module and preventing the input voltage of the first DC-DC conversion module from being less than the minimum input voltage threshold of the first DC-DC conversion module. This enables each battery cell in the battery unit to be fully discharged, avoiding the technical drawbacks of poor battery formation effect and poor accuracy of the detected battery capacity caused by the inability of each battery cell in the battery unit to be fully discharged.

[0076] In some embodiments, optionally, referring to Figure 5 , Figure 5 is a schematic structural diagram of a battery formation device according to some embodiments of the present application. As Figure 5 shown, a first DC-DC conversion module 110, an additional power supply 120, and a control circuit 130 form a set of charge and discharge components, and each set of charge and discharge components is used to perform formation processing on the corresponding battery unit 200. Specifically, the high-voltage end 112 of the first DC-DC conversion module 110 in each set of charge and discharge components is electrically connected to the DC bus. With this structure, formation processing can be performed on multiple groups of battery units simultaneously, improving the formation processing efficiency.

[0077] In some embodiments, optionally, the control circuit 130 is further configured to connect the low-voltage end 111 of the first DC-DC conversion module 110 and the battery unit 200 in series when the battery formation device 100 charges the battery unit 200.

[0078] Referring to Figure 6 , Figure 6 is a schematic diagram of an equivalent circuit when the battery formation device of some embodiments of the present application charges the battery unit. As Figure 6 shown, when the battery formation device 100 charges the battery unit 200, the additional power supply 120 is not in this charging circuit.

[0079] Adopting the implementation method in this embodiment can, on the one hand, avoid the influence of the additional power supply on the charging process when the battery formation device charges the battery unit; on the other hand, the additional power supply can not output voltage when the battery formation device charges the battery unit, thereby reducing the overall energy consumption of the battery formation device.

[0080] In some embodiments, optionally, the battery formation device 100 further includes a detection module 150, and the detection module 150 is used to be electrically connected to the battery unit 120 and the control circuit 130.

[0081] Referring to Figure 7 ,Figure 7 The structural schematic diagram of the battery formation device according to some embodiments of the present application. As Figure 7 shown, the detection module 150 is electrically connected to the battery unit 120 and the control circuit 130 respectively. When the battery unit 200 discharges for the battery formation device 100, the detection module 150 can detect the output voltage of the battery unit 200 through the electrical connection with the battery unit 120. Moreover, when the battery unit 200 discharges for the battery formation device 100 and the detection module 150 detects that the output voltage of the battery unit is less than the first voltage threshold, the control circuit 130 connects the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in series. Correspondingly, when the battery formation device 100 charges the battery unit 200, or when the battery unit 200 discharges for the battery formation device 100 but the detection module 150 detects that the output voltage of the battery unit is greater than or equal to the first voltage threshold, the control circuit 130 only connects the low-voltage end 111 of the first DC-DC conversion module in series with the battery unit 200.

[0082] By adopting the implementation manner in this embodiment, the detection module detects the output voltage of the battery unit when the battery unit discharges. When the battery unit is in the discharge state and the output voltage of the battery unit is less than the first voltage threshold, the additional power supply is started, and the additional power supply is connected in series to the discharge loop composed of the low-voltage end of the first DC-DC conversion module and the battery unit, further reducing the overall energy consumption of the battery formation device and reducing the formation processing cost of the battery formation device.

[0083] In some embodiments, optionally, a first DC-DC conversion module, an additional power supply, and a control circuit form a set of charge and discharge components, and a set of charge and discharge components corresponds to a single battery unit. The battery unit includes one or more battery cells. By performing formation processing on a single battery unit through a set of charge and discharge components, it is possible to avoid the interference of the formation process of other battery units on the formation process of this battery unit, and is beneficial to improving the accuracy of the capacity detection of this battery unit.

[0084] In some embodiments, optionally, a set of charge and discharge components corresponds to a single battery unit, and the control circuit 130 includes a first control switch 131 and a second control switch 132.

[0085] Refer to Figure 8 , Figure 8 The structural schematic diagram of the battery formation device according to some embodiments of the present application. As Figure 8As shown in the figure, the first sub-terminal of the low-voltage end 111 of the first DC-DC conversion module 110 is used for electrical connection with the first pole of the battery unit 200. The first end of the first control switch 131 is used for electrical connection with the second sub-terminal of the low-voltage end 111 of the first DC-DC conversion module 110 and the second pole of the additional power supply. The second end of the first control switch 131 is used for electrical connection with the second pole of the battery unit 200 and the second end of the second control switch 132. The first end of the second control switch 132 is used for electrical connection with the first pole of the additional power supply 120. Wherein, the first pole is the positive pole and the second pole is the negative pole; or, the first pole is the negative pole and the second pole is the positive pole.

[0086] When the battery unit 200 discharges for the battery formation device 100, the first end and the second end of the first control switch 131 are not connected, and the first end and the second end of the second control switch 132 are connected. In other words, when the battery unit 200 discharges for the battery formation device 100, the first control switch 131 is in the off state and the second control switch 132 is in the on state, so that the battery unit 200, the low-voltage end 111 of the first DC-DC conversion module 110, and the additional power supply 120 are connected in series, and the additional power supply 120 has the same polarity as the battery unit 200, and the additional power supply 120 and the battery unit 200 can output voltages with the same polarity.

[0087] Further optionally, when the battery unit 200 discharges for the battery formation device 100 and the output voltage of the battery unit 200 is lower than the first voltage threshold, the first control switch 131 is in the off state and the second control switch 132 is in the on state.

[0088] Further optionally, when the battery formation device 100 charges the battery unit 200, or when the battery unit 200 discharges for the battery formation device 100 but the output voltage of the battery unit 200 is greater than or equal to the first voltage threshold, the first control switch 131 is in the on state and the second control switch 132 is in the off state. Thus, only the battery unit 200 is connected in series with the low-voltage end 111 of the first DC-DC conversion module 110.

[0089] Adopting the implementation method in this embodiment, a set of charge and discharge components corresponds to a single battery unit, and the access of the additional power supply in the charge and discharge circuit is controlled by the first control switch and the second control switch, further streamlining the structure of the battery formation device and saving the formation cost.

[0090] In some embodiments, optionally, a set of charge and discharge components corresponds to a single battery unit, and the control circuit 130 includes a first control switch 131 and a second control switch 132.

[0091] Refer to Figure 9 ,Figure 9 The figure is a schematic structural diagram of a battery formation device according to some embodiments of the present application. As Figure 9 shown, a first sub-terminal of the low-voltage end 111 of the first DC-DC conversion module 110 is used for electrical connection with the first pole of the battery cell 200; a first end of the first control switch 131 is used for electrical connection with a second sub-terminal of the low-voltage end 111 of the first DC-DC conversion module 110 and a first end of the second control switch 132, and a second end of the first control switch 131 is used for electrical connection with the second pole of the battery cell 200 and the first pole of the additional power supply 120; a second end of the second control switch 132 is used for electrical connection with the second pole of the additional power supply 120. Wherein, the first pole is the positive pole and the second pole is the negative pole; alternatively, the first pole is the negative pole and the second pole is the positive pole.

[0092] When the battery cell 200 discharges for the battery formation device 100, the first end and the second end of the first control switch 131 are not connected, and the first end and the second end of the second control switch 132 are connected. In other words, when the battery cell 200 discharges for the battery formation device 100, the first control switch 131 is in the off state and the second control switch 132 is in the on state, so that the battery cell 200, the low-voltage end 111 of the first DC-DC conversion module 110, and the additional power supply 120 are connected in series, and the additional power supply 120 has the same polarity as the battery cell 200, and the additional power supply 120 and the battery cell 200 can output voltages with the same polarity.

[0093] Further optionally, when the battery cell 200 discharges for the battery formation device 100 and the output voltage of the battery cell 200 is lower than the first voltage threshold, the first control switch 131 is in the off state and the second control switch 132 is in the on state.

[0094] Further optionally, when the battery formation device 100 charges the battery cell 200, or when the battery cell 200 discharges for the battery formation device 100 but the output voltage of the battery cell 200 is greater than or equal to the first voltage threshold, the first control switch 131 is in the on state and the second control switch 132 is in the off state. Thus, only the battery cell 200 is connected in series with the low-voltage end 111 of the first DC-DC conversion module 110.

[0095] Adopting the implementation method in this embodiment, a set of charge and discharge components corresponds to a single battery cell, and the access of the additional power supply in the charge and discharge circuit is controlled by the first control switch and the second control switch, further streamlining the structure of the battery formation device and saving the formation cost.

[0096] In some embodiments, optionally, a set of charge and discharge components corresponds to a single battery cell, and the control circuit 130 includes a third control switch 133.

[0097] Reference Figure 10 , Figure 10 is a schematic structural diagram of a battery formation device according to some embodiments of the present application. As Figure 10 shown, a first sub-terminal of the low-voltage end 111 of the first DC-DC conversion module 110 is used for electrical connection with a first pole of the battery cell 200; a first end of the third control switch 133 is used for electrical connection with a second sub-terminal of the low-voltage end 111 of the first DC-DC conversion module 110, a second end of the third control switch is used for electrical connection with a second pole of the battery cell 200 and a first pole of the additional power supply 120, and a third end of the third control switch 133 is used for electrical connection with a second pole of the additional power supply. Among them, the first pole is the positive pole and the second pole is the negative pole; alternatively, the first pole is the negative pole and the second pole is the positive pole.

[0098] When the battery cell 200 discharges for the battery formation device 100, the first end and the second end of the third control switch 133 are not connected, and the first end and the third end of the third control switch 133 are connected.

[0099] Adopting the implementation method in this embodiment, a set of charge and discharge components corresponds to a single battery cell, and the access of the additional power supply in the charge and discharge circuit can be controlled by a single third control switch, further streamlining the structure of the battery formation device, reducing the number of components of the battery formation device, and saving the formation cost.

[0100] In some embodiments, optionally, a set of charge and discharge components corresponds to multiple battery cells, and the multiple battery cells are specifically a first battery cell and a second battery cell. Among them, the number of battery monomers included in the first battery cell and the second battery cell, as well as the connection manner of the battery monomers, may be the same or different. By performing formation processing on multiple battery cells through a set of charge and discharge components, the utilization rate of the charge and discharge components is effectively improved, and the energy consumption and cost of the battery formation device are reduced.

[0101] In some embodiments, optionally, a set of charge and discharge components corresponds to a first battery cell and a second battery cell. The control circuit 130 includes a first control switch 131 and a second control switch 132.

[0102] Reference Figure 11 , Figure 11 is a schematic structural diagram of a battery formation device according to some embodiments of the present application. As Figure 11As shown, the first sub-terminal of the low-voltage end 111 of the first DC-DC conversion module 110 is used for electrical connection with the first pole of the first battery unit 210, and the second sub-terminal of the low-voltage end 111 of the first DC-DC conversion module 110 is used for electrical connection with the second pole of the second battery unit 220; the first end of the first control switch 131 is used for electrical connection with the second pole of the first battery unit 210 and the first pole of the additional power supply 120, and the second end of the first control switch 131 is used for electrical connection with the first pole of the second battery unit 220 and the second end of the second control switch 132; the first end of the second control switch 132 is used for electrical connection with the second pole of the additional power supply.

[0103] When the first battery unit 210 and / or the second battery unit 220 discharges for the battery forming device 100, the first end and the second end of the first control switch 131 are not connected, and the first end and the second end of the second control switch 132 are connected, so as to connect the first battery unit 210, the additional power supply 120 and the second battery unit 220 in series. Moreover, the polarities of the first battery unit 210, the additional power supply 120 and the second battery unit 220 are the same, and the voltages output by the first battery unit 210, the additional power supply 120 and the second battery unit 220 are superimposed and then input to the low-voltage end of the first DC-DC conversion module 110.

[0104] Further optionally, when the first battery unit 210 and / or the second battery unit 220 discharges for the battery forming device 100 and the sum of the output voltages of the first battery unit 210 and the second battery unit 220 is lower than the first voltage threshold, the first control switch 131 is in the off state and the second control switch 132 is in the on state.

[0105] Further optionally, when the first battery unit 210 and / or the second battery unit 220 charges the battery unit 200, or when the first battery unit 210 and / or the second battery unit 220 discharges for the battery forming device 100 but the sum of the output voltages of the first battery unit 210 and the second battery unit 220 is greater than or equal to the first voltage threshold, the first control switch 131 is in the on state and the second control switch 132 is in the off state. Thus, only the first battery unit 210, the second battery unit 220 and the low-voltage end 111 of the first DC-DC conversion module 110 are connected in series.

[0106] Adopting the implementation mode in this embodiment, a set of charge-discharge components corresponds to the first battery unit and the second battery unit, and the access of the additional power supply to the charge-discharge loop is controlled by the first control switch and the second control switch, which simplifies the structure of the battery formation device and saves the formation cost; moreover, the first control switch and the second control switch are arranged between the two battery units, which can effectively reduce the length of the connecting wires and save the cost of the battery formation device.

[0107] In some embodiments, optionally, a set of charge-discharge components corresponds to the first battery unit and the second battery unit. The control circuit 130 includes a first control switch 131 and a second control switch 132.

[0108] Reference Figure 12 , Figure 12 is a schematic structural diagram of the battery formation device according to some embodiments of the present application. As Figure 12 shown, the first sub-end of the low-voltage end 111 of the first DC-DC conversion module 110 is used for electrical connection with the first pole of the first battery unit 210, and the second sub-end of the low-voltage end 111 of the first DC-DC conversion module 110 is used for electrical connection with the second pole of the second battery unit 220; the first end of the first control switch 131 is used for electrical connection with the second pole of the first battery unit 210 and the first end of the second control switch 132, and the second end of the first control switch 131 is used for electrical connection with the second pole of the additional power supply 120 and the first pole of the second battery unit 220; the second end of the second control switch 132 is used for electrical connection with the first pole of the additional power supply 120;

[0109] When the first battery unit 210 and / or the second battery unit 220 discharges the battery formation device 100, the first end and the second end of the first control switch 131 are not connected, and the first end and the second end of the second control switch 132 are connected. That is, when the first battery unit 210 and / or the second battery unit 220 discharges the battery formation device 100, the first control switch 131 is disconnected and the second control switch 132 is closed.

[0110] Further optionally, when the first battery unit 210 and / or the second battery unit 220 discharges the battery formation device 100, and the sum of the output voltages of the first battery unit 210 and the second battery unit 220 is lower than the first voltage threshold, the first control switch 131 is in the off state and the second control switch 132 is in the on state.

[0111] Further optionally, when the first battery unit 210 and / or the second battery unit 220 charge the battery unit 200, or when the first battery unit 210 and / or the second battery unit 220 discharge the battery forming device 100 but the sum of the output voltages of the first battery unit 210 and the second battery unit 220 is greater than or equal to the first voltage threshold, the first control switch 131 is closed and the second control switch 132 is opened. Thus, only the first battery unit 210, the second battery unit 220 are connected in series with the low-voltage end 111 of the first DC-DC conversion module 110.

[0112] By adopting the implementation manner in this embodiment, a set of charge and discharge components corresponds to the first battery unit and the second battery unit, and the access of the additional power supply in the charge and discharge loop is controlled by the first control switch and the second control switch, which simplifies the structure of the battery forming device and saves the forming cost; moreover, the first control switch and the second control switch are arranged between the two battery units, which can effectively reduce the length of the connecting wires and save the cost of the battery forming device.

[0113] In some embodiments, optionally, a set of charge and discharge components corresponds to the first battery unit and the second battery unit. The control circuit 130 includes a third control switch 133.

[0114] Reference Figure 13 , Figure 13 is a schematic structural diagram of a battery forming device according to some embodiments of the present application. As Figure 13 shown, the first sub-end of the low-voltage end 111 of the first DC-DC conversion module 110 is used for electrical connection with the first pole of the first battery unit 210, and the second sub-end of the low-voltage end 111 of the first DC-DC conversion module 110 is used for electrical connection with the second pole of the second battery unit 220; the first end of the third control switch 133 is used for electrical connection with the second pole of the first battery unit 210, the second end of the third control switch 133 is used for electrical connection with the first pole of the additional power supply 120, and the third end of the third control switch 133 is used for electrical connection with the first pole of the second battery unit 220.

[0115] When the first battery unit 210 and / or the second battery unit 220 discharge the battery forming device 100, the first end and the second end of the third control switch 133 are connected to connect the first battery unit 210, the additional power supply 120 and the second battery unit 220 in series. Moreover, the voltage polarities output by the first battery unit 210, the additional power supply 120 and the second battery unit 220 are the same, and the voltages output by the first battery unit 210, the additional power supply 120 and the second battery unit 220 are superimposed and then input to the low-voltage end 111 of the first DC-DC conversion module 110.

[0116] Further optionally, when the first battery unit 210 and / or the second battery unit 220 discharges the battery forming device 100, and the sum of the output voltages of the first battery unit 210 and the second battery unit 220 is lower than the first voltage threshold, the first end of the third control switch 133 is connected to the second end of the third control switch.

[0117] Further optionally, when the first battery unit 210 and / or the second battery unit 220 charges the battery unit 200, or when the first battery unit 210 and / or the second battery unit 220 discharges the battery forming device 100 but the sum of the output voltages of the first battery unit 210 and the second battery unit 220 is greater than or equal to the first voltage threshold, the first end of the third control switch 133 is connected to the third end of the third control switch, so that only the first battery unit 210 and the second battery unit 220 are connected in series with the low-voltage end 111 of the first DC-DC conversion module 110.

[0118] By adopting the implementation manner in this embodiment, a set of charge and discharge components corresponds to the first battery unit and the second battery unit, and the access of the additional power supply to the charge and discharge loop is controlled by a control switch, further reducing the number of components included in the battery forming device and saving the forming cost; moreover, the third control switch is arranged between the two battery units, which can effectively reduce the length of the connecting wire and save the cost of the battery forming device.

[0119] In some embodiments, optionally, the additional power supply is specifically a second DC-DC conversion module.

[0120] Reference Figure 14 , Figure 14 is a schematic structural diagram of a battery forming device according to some embodiments of the present application. As Figure 14 shown, the high-voltage end 122 of the second DC-DC conversion module 120 is used for electrical connection with the DC bus 140, and the low-voltage end 121 of the second DC-DC conversion module 120 is used for electrical connection with the control circuit 130.

[0121] When the battery cell 200 discharges for the battery formation device 100, the control circuit 130 is used to connect the low-voltage terminal 121 of the second DC-DC conversion module 120, the low-voltage terminal 111 of the first DC-DC conversion module, and the battery cell 200 in series. And when the battery cell 200 discharges for the battery formation device 100, the voltage polarity output by the low-voltage terminal 121 of the second DC-DC conversion module 120 is consistent with the voltage polarity output by the battery cell. Thus, the voltage output by the low-voltage terminal 121 of the second DC-DC conversion module 120 is superimposed on the voltage output by the battery cell and then input to the low-voltage terminal 111 of the first DC-DC conversion module, increasing the input voltage of the first DC-DC conversion module and avoiding the drawback that the input voltage of the first DC-DC conversion module is less than the minimum input voltage threshold of the first DC-DC conversion module.

[0122] Adopting the implementation manner in this embodiment, using the second DC-DC conversion module as an additional power source, on the one hand, when the battery cell discharges for the battery formation device, the voltage output by the low-voltage terminal of the second DC-DC conversion module is superimposed on the voltage output by the battery cell and then input to the low-voltage terminal of the first DC-DC conversion module, increasing the input voltage of the first DC-DC conversion module and avoiding the drawback that the input voltage of the first DC-DC conversion module is less than the minimum input voltage threshold of the first DC-DC conversion module; on the other hand, the second DC-DC conversion module has the characteristics of low power consumption and small volume, thus being beneficial to reducing the energy consumption of the battery formation device and decreasing the volume of the battery formation device.

[0123] In some embodiments, optionally, the battery formation device 100 further includes: an AC-DC conversion module 160.

[0124] Reference Figure 15 , Figure 15 is a schematic structural diagram of the battery formation device according to some embodiments of the present application. As Figure 15 shown, the AC terminal 161 of the AC-DC conversion module 160 is used for electrical connection with the power grid, and the DC terminal 162 of the AC-DC conversion module 160 is used for electrical connection with the DC bus 140.

[0125] The AC-DC conversion module 160 is used to, when the battery cell 200 discharges for the battery formation device 100, convert the DC voltage input to the DC terminal 162 of the AC-DC conversion module 160 into an AC voltage and output the AC voltage to the power grid through the AC terminal 161 of the AC-DC conversion module 160; and the AC-DC conversion module 160 is used to, when the battery cell 200 discharges for the battery formation device 100, convert the AC voltage input to the AC terminal 161 of the AC-DC conversion module 160 into a DC voltage and output the DC voltage to the DC bus through the DC terminal of the AC-DC conversion module.

[0126] By adopting the implementation mode in this embodiment, an AC-DC conversion module is provided in the battery formation device, which can convert the alternating current of the power grid into direct current and be used for charging the battery unit; it can also convert the direct current output by the battery unit into alternating current and output it to the power grid, so that the battery formation device can be applied to the scenario of alternating current, expanding the application range of the battery formation device.

[0127] In some embodiments, optionally, the battery formation device 100 includes: a first DC-DC conversion module 110, a second DC-DC conversion module 120, a first control switch 131, a second control switch 132, a DC bus 140, and an AC-DC conversion module 160.

[0128] Reference Figure 16 , Figure 16 is a schematic structural diagram of the battery formation device according to some embodiments of the present application. As Figure 16 shown, the first sub-terminal of the low-voltage end of the first DC-DC conversion module 110 is electrically connected to the first pole of the battery unit; the second sub-terminal of the low-voltage end of the first DC-DC conversion module 110 is electrically connected to the first end of the first control switch and the first sub-terminal of the low-voltage end of the second DC-DC conversion module 120; the second sub-terminal of the low-voltage end of the second DC-DC conversion module 120 is electrically connected to the first end of the second control switch 132; the second end of the second control switch 132 is electrically connected to the second pole of the battery unit 200, and the second end of the first control switch 131 is electrically connected to the second pole of the battery unit 200. Among them, the polarity of the low-voltage end of the second DC-DC conversion module 120 is the same as that of the battery unit; the high-voltage end 112 of the first DC-DC conversion module 110, the high-voltage end 122 of the second DC-DC conversion module 120, and the DC end 162 of the AC-DC conversion module 160 are electrically connected to the DC bus; the AC end 161 of the AC-DC conversion module 160 is electrically connected to the power grid.

[0129] When the battery cell 200 discharges to the battery formation device 100, if the voltage output by the battery cell 100 is less than the first voltage threshold, the first control switch 131 is turned off and the second control switch 132 is turned on, so that the battery cell 200, the low-voltage end of the first DC-DC conversion module 110, and the low-voltage end of the second DC-DC conversion module 120 are connected in series. Among them, the low-voltage end of the first DC-DC conversion module 110 is the electrical device, and the low-voltage end of the first DC-DC conversion module 110 is the input end; the low-voltage end of the second DC-DC conversion module 110 is the power supply device, and the low-voltage end of the second DC-DC conversion module 120 is the output end, and the polarity of the low-voltage end 122 of the second DC-DC conversion module 120 is the same as that of the battery cell 200. Thus, the voltage output by the battery cell 200 and the voltage output by the low-voltage end 122 of the second DC-DC conversion module 120 are superimposed and then input to the low-voltage end 111 of the first DC-DC conversion module 110, increasing the voltage at the input end of the first DC-DC conversion module 110 and avoiding the drawback that the voltage at the input end of the first DC-DC conversion module 110 is lower than the input voltage limit of the first DC-DC conversion module 110. Moreover, the first DC-DC conversion module boosts the voltage input at the low-voltage end and then outputs it to the DC bus through the high-voltage end 112. The DC bus connects and inputs the voltage to the DC end 162 of the AC-DC conversion module 160, and the AC-DC conversion module 160 converts the direct current into alternating current and then transmits it to the power grid via the AC end 161. The capacity detection device connected to the power grid can obtain the capacity information of the battery cell.

[0130] When the battery formation device 100 charges the battery cell 200, or when the battery cell 200 discharges to the battery formation device 100 and the voltage output by the battery cell 100 is greater than or equal to the first voltage threshold, the first control switch 131 is turned on and the second control switch 132 is turned off, then the battery cell 200 is connected in series with the first DC-DC conversion module 110. The AC-DC conversion module 160 converts the AC voltage of the power grid into a DC voltage and then outputs it to the DC bus; the DC bus then transmits the voltage to the high-voltage end 112 of the first DC-DC conversion module 110, and after step-down processing, the voltage is output via the low-voltage end 111, and this output voltage is used to charge the battery cell.

[0131] According to some embodiments of the present application, with reference to Figure 17 . Figure 17 is a schematic flowchart of the control method of the battery formation device according to some embodiments of the present application.

[0132] As Figure 17 shown, the control method includes the following steps:

[0133] Step S1710, receiving a battery cell discharge control instruction.

[0134] The battery formation device can receive control instructions from the middle-level machine, and the control instructions can specifically be discharge control instructions and charge control instructions. Among them, the discharge control instruction is used to make the battery unit discharge to the battery formation device, and the charge control instruction is used to make the battery formation device charge the battery unit.

[0135] Optionally, it can also receive the charging mode information sent by the middle-level machine. The charging mode information specifically indicates the charging mode of the battery unit, and the charging mode can be a constant current mode or a constant voltage mode.

[0136] Optionally, it can also receive the time limit parameter for charging or discharging sent by the middle-level machine. The time limit parameter indicates the time range for charging or discharging the battery unit.

[0137] Optionally, it can also receive the current accuracy parameter sent by the middle-level machine. The current accuracy parameter indicates the accuracy range of the current during the charging or discharging process.

[0138] Step S1720: Control the low-voltage end of the first DC-DC conversion module in the battery formation device, the battery unit, and the additional power supply to be connected in series; and control the battery unit to discharge to the battery formation device.

[0139] After receiving the discharge control instruction, the battery formation device controls the low-voltage end of the first DC-DC conversion module in the battery formation device, the battery unit, and the additional power supply to be connected in series, and controls the battery unit to discharge to the battery formation device.

[0140] By adopting the implementation method in this embodiment, it can respond in a timely manner to the discharge control instruction issued by the middle-level machine, connect the additional power supply in series to the discharge loop formed by the low-voltage end of the first DC-DC conversion module and the battery unit, thereby increasing the voltage input to the low-voltage end of the first DC-DC conversion module, avoiding the situation where the voltage input to the low-voltage end of the first DC-DC conversion module is less than the lowest threshold of the input voltage of the first DC-DC conversion module, so that each battery cell in the battery unit can be fully discharged, and avoiding the technical drawbacks of poor battery unit pooling effect and poor accuracy of the detected battery capacity caused by the inability of each battery cell in the battery unit to be fully discharged.

[0141] In some embodiments, optionally, the method further includes: detecting the output voltage of the battery unit, and if it is detected that the output voltage of the battery unit is less than the first voltage threshold, controlling the low-voltage end of the first DC-DC conversion module in the battery formation device, the battery unit, and the additional power supply to be connected in series.

[0142] Adopting the implementation manner in this embodiment, the additional power supply is started only when the battery unit is in the discharging state and the output voltage of the battery unit is less than the first voltage threshold, and the additional power supply is connected in series to the discharging circuit composed of the low-voltage end of the first DC-DC conversion module and the battery unit, further saving the overall energy consumption of the battery formation device and reducing the formation processing cost of the battery formation device.

[0143] In some embodiments, optionally, the method further includes: if it is detected that the output voltage of the battery unit is less than the first voltage threshold, after suspending the AC-DC conversion module in the battery formation device, controlling the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in series in the battery formation device; and after controlling the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in series in the battery formation device, restarting the AC-DC conversion module.

[0144] Adopting the implementation manner in this embodiment, when it is determined that the additional power supply needs to be connected, if the additional power supply is directly connected in series to the discharging circuit composed of the low-voltage end of the first DC-DC conversion module and the battery unit, a short-term peak voltage will appear in the first DC-DC conversion module, thereby affecting the service life of the first DC-DC conversion module. In this embodiment, the AC-DC conversion module is first suspended to avoid the AC-DC conversion module continuously outputting high voltage to the first DC-DC conversion module via the DC bus, and then the additional power supply is connected in series to the discharging circuit composed of the low-voltage end of the first DC-DC conversion module and the battery unit, thereby avoiding the short-term peak voltage in the first DC-DC conversion module and extending the service life of the first DC-DC conversion module.

[0145] In some embodiments, optionally, the method further includes: collecting the battery state information of the battery unit and feeding back the battery state information to the middle computer.

[0146] The battery state information may specifically include at least one of the following information: board temperature, currently executed control instruction, charge and discharge mode, actual current value.

[0147] Adopting the implementation manner in this embodiment, the battery state information of the battery unit is collected and fed back in real time, which is convenient for timely discovering the state of the battery unit during the pooling process, for timely discovering abnormal states and for timely responding to abnormal states.

[0148] In some embodiments, optionally, the method further includes: determining whether the charging duration for charging the battery unit by the battery formation device exceeds a preset duration; if so, sending an alarm message to the middle computer; and receiving an abort instruction sent by the middle computer based on the alarm message and suspending the AC-DC conversion module in the battery formation device.

[0149] After the charging duration for charging the battery cell by the battery formation device exceeds the preset duration, it indicates that the charging time of the battery cell has exceeded the time limit of the formation process, but the power of the battery cell has not yet met the requirements, which indicates that the current belongs to the fault mode. Then, an alarm message is sent to the middle computer in a timely manner. The middle computer issues an instruction to stop the output of the AC-DC conversion module according to the alarm message to suspend the output of the AC-DC conversion module.

[0150] Adopting the implementation method in this embodiment, by determining whether there is an abnormality in the battery cell according to the charging duration of the battery cell, an alarm message is sent to the middle computer in a timely manner when it is determined that there is an abnormality in the battery cell, so as to facilitate the handling of the abnormality of the battery cell. And during the handling process, the output of the AC-DC conversion module is aborted. On the one hand, it protects the safety of the battery cell and the battery formation device, and on the other hand, it reduces the energy consumption of the battery formation device and saves the formation cost.

[0151] In some embodiments, optionally, the method further includes: determining whether the output voltage of the battery cell exceeds a second voltage threshold; if so, sending an alarm message to the middle computer; receiving an abort instruction sent by the middle computer based on the alarm message, and pausing the output of the battery cell according to the abort instruction.

[0152] During the charging process of the battery cell to the battery formation device, if it is detected that the output voltage of the battery cell exceeds the second voltage threshold, it indicates that the current is in an abnormal state. Then, an alarm message is fed back to the middle computer in a timely manner, and the output of the battery cell is aborted in a timely manner according to the abort instruction sent by the middle computer.

[0153] Adopting the implementation method in this embodiment, by determining whether there is an abnormality according to the discharge voltage of the battery cell, an alarm message is sent to the middle computer in a timely manner when it is determined that there is an abnormality, so as to facilitate the handling of the abnormal state. And during the handling process, the output of the battery cell is aborted. On the one hand, it protects the safety of the battery cell and the battery formation device, and on the other hand, it reduces the energy consumption of the battery cell and saves the formation cost.

[0154] According to some embodiments of the present application, refer to Figure 18 . Figure 18 It is a schematic structural diagram of a battery formation control system according to some embodiments of the present application.

[0155] As Figure 18 shown, the battery formation control system 400 includes a battery formation device 100 and a middle computer 300. The middle computer 300 is communicatively connected to the battery formation device 100.

[0156] Among them, the middle computer 300 is used to send a charging control instruction or a discharging control instruction to the battery formation device 100.

[0157] The battery formation device 100 is configured to control the battery cell 200 to discharge for the battery formation device 100 according to a discharge control instruction; or, the battery formation device 100 is configured to control the battery formation device 100 to charge the battery cell 200 according to a charge control instruction.

[0158] Among them, the specific structure and implementation process of the battery formation device 100 can refer to the description of the corresponding part in other embodiments, which will not be elaborated here.

[0159] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery formation device, characterized in that, Comprising: A first DC-DC conversion module, an additional power supply, and a control circuit; The low-voltage end of the first DC-DC conversion module is used for electrical connection with the control circuit, and the high-voltage end of the first DC-DC conversion module is used for electrical connection with the DC bus; the first DC-DC conversion module is used for converting a first voltage input at the low-voltage end into a second voltage when the battery unit discharges for the battery formation device, and outputting the second voltage through the high-voltage end; wherein, the second voltage is higher than the first voltage; The additional power supply is used for electrical connection with the control circuit, and the additional power supply is used for outputting an additional voltage; wherein, the polarity of the additional power supply is the same as the polarity of the battery unit; The control circuit is used for electrical connection with the battery unit, the low-voltage end of the first DC-DC conversion module, and the additional power supply; the control circuit is used for connecting the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in series when the battery unit discharges for the battery formation device.

2. The device according to claim 1, characterized in that, The control circuit is further used for connecting the low-voltage end of the first DC-DC conversion module and the battery unit in series when the battery formation device charges the battery unit.

3. The device according to claim 1, characterized in that, The device further comprises: A detection module, the detection module is used for electrical connection with the battery unit and the control circuit, and the detection module is used for detecting the output voltage of the battery unit; The control circuit is further used for connecting the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in series when the battery unit discharges for the battery formation device and the detection module detects that the output voltage of the battery unit is less than a first voltage threshold.

4. The device according to any one of claims 1 to 3, characterized in that, The battery unit is single.

5. The device according to claim 4, characterized in that, The control circuit comprises a first control switch and a second control switch; The first sub-end of the low-voltage end of the first DC-DC conversion module is used for electrical connection with the first pole of the battery unit; The first end of the first control switch is used for electrical connection with the second sub-end of the low-voltage end of the first DC-DC conversion module and the second pole of the additional power supply, and the second end of the first control switch is used for electrical connection with the second pole of the battery unit and the second end of the second control switch; The first end of the second control switch is used for electrical connection with the first pole of the additional power supply; Wherein, when the battery unit discharges for the battery formation device, the first end and the second end of the first control switch are not connected, and the first end and the second end of the second control switch are connected.

6. The device according to claim 4, characterized in that, The control circuit comprises a first control switch and a second control switch; The first sub-end of the low-voltage end of the first DC-DC conversion module is used for electrical connection with the first pole of the battery unit; The first end of the first control switch is used for electrical connection with the second sub-end of the low-voltage end of the first DC-DC conversion module and the first end of the second control switch. The second end of the first control switch is used for electrical connection with the second pole of the battery unit and the first pole of the additional power supply; The second end of the second control switch is used for electrical connection with the second pole of the additional power supply; Wherein, when the battery unit discharges for the battery forming device, the first end and the second end of the first control switch are not connected, and the first end and the second end of the second control switch are connected.

7. The device according to claim 4, characterized in that The control circuit includes a third control switch; The first sub-end of the low-voltage end of the first DC-DC conversion module is used for electrical connection with the first pole of the battery unit; The first end of the third control switch is used for electrical connection with the second sub-end of the low-voltage end of the first DC-DC conversion module. The second end of the third control switch is used for electrical connection with the second pole of the battery unit and the first pole of the additional power supply. The third end of the third control switch is used for electrical connection with the second pole of the additional power supply; Wherein, when the battery unit discharges for the battery forming device, the first end and the second end of the third control switch are not connected, and the first end and the third end of the third control switch are connected.

8. The device according to any one of claims 1 to 3, characterized in that, The battery unit includes a first battery unit and a second battery unit.

9. The device according to claim 8, characterized in that, The control circuit includes a first control switch and a second control switch; The first sub-end of the low-voltage end of the first DC-DC conversion module is used for electrical connection with the first pole of the first battery unit. The second sub-end of the low-voltage end of the first DC-DC conversion module is used for electrical connection with the second pole of the second battery unit; The first end of the first control switch is used for electrical connection with the second pole of the first battery unit and the first pole of the additional power supply. The second end of the first control switch is used for electrical connection with the first pole of the second battery unit and the second end of the second control switch; The first end of the second control switch is used for electrical connection with the second pole of the additional power supply; Wherein, when the battery unit discharges for the battery forming device, the first end and the second end of the first control switch are not connected, and the first end and the second end of the second control switch are connected.

10. The device according to claim 8, characterized in that, The control circuit includes a first control switch and a second control switch; The first sub-end of the low-voltage end of the first DC-DC conversion module is used for electrical connection with the first pole of the first battery unit. The second sub-end of the low-voltage end of the first DC-DC conversion module is used for electrical connection with the second pole of the second battery unit; The first end of the first control switch is used for electrical connection with the second pole of the first battery unit and the first end of the second control switch. The second end of the first control switch is used for electrical connection with the second pole of the additional power supply and the first pole of the second battery unit; The second terminal of the second control switch is used for electrically connecting to the first pole of the additional power supply; Wherein, when the battery unit discharges for the battery forming device, the first terminal and the second terminal of the first control switch are not connected, and the first terminal and the second terminal of the second control switch are connected.

11. The device according to claim 8, characterized in that, The control circuit includes a third control switch; The first sub-terminal of the low-voltage end of the first DC-DC conversion module is used for electrically connecting to the first pole of the first battery unit, and the second sub-terminal of the low-voltage end of the first DC-DC conversion module is used for electrically connecting to the second pole of the second battery unit; The first terminal of the third control switch is used for electrically connecting to the second pole of the first battery unit, the second terminal of the third control switch is used for electrically connecting to the first pole of the additional power supply, and the third terminal of the third control switch is used for electrically connecting to the first pole of the second battery unit; Wherein, when the battery unit discharges for the battery forming device, the first terminal and the second terminal of the third control switch are connected.

12. The device according to claim 1, characterized in that, The additional power supply is a second DC-DC conversion module; The high-voltage end of the second DC-DC conversion module is used for electrically connecting to the DC bus, and the low-voltage end of the second DC-DC conversion module is used for being connected in series with the low-voltage end of the first DC-DC conversion module and the battery unit when the battery unit discharges for the battery forming device.

13. The device according to claim 1, characterized in that, The device further includes: an AC-DC conversion module; The AC end of the AC-DC conversion module is used for electrically connecting to the power grid, and the DC end of the AC-DC conversion module is used for electrically connecting to the DC bus; The AC-DC conversion module is configured to, when the battery unit discharges for the battery forming device, convert the DC voltage input at the DC end of the AC-DC conversion module into an AC voltage and output the AC voltage through the AC end of the AC-DC conversion module; And, the AC-DC conversion module is configured to, when the battery forming device charges the battery unit, convert the AC voltage input at the AC end of the AC-DC conversion module into a DC voltage and output the DC voltage through the DC end of the AC-DC conversion module.

14. A control method for a battery formation device according to any one of claims 1-13, characterized in that, Comprising: Receiving a battery unit discharge control instruction; Controlling the series connection of the low-voltage end of the first DC-DC conversion module, the battery unit and the additional power supply in the battery forming device; And Controlling the battery unit to discharge for the battery forming device.

15. The method according to claim 14, wherein The controlling the series connection of the low-voltage end of the first DC-DC conversion module, the battery unit and the additional power supply in the battery forming device further includes: Detecting the output voltage of the battery unit; If it is detected that the output voltage of the battery unit is less than the first voltage threshold, then controlling the series connection of the low-voltage end of the first DC-DC conversion module, the battery unit and the additional power supply in the battery forming device.

16. The method according to claim 15, characterized in that, If it is detected that the output voltage of the battery unit is less than the first voltage threshold, controlling the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in the battery formation device to be connected in series further includes: If it is detected that the output voltage of the battery unit is less than the first voltage threshold, after pausing the AC-DC conversion module of the battery formation device, control the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in the battery formation device to be connected in series; And after controlling the low-voltage end of the first DC-DC conversion module, the battery unit, and the additional power supply in the battery formation device to be connected in series, restart the AC-DC conversion module.

17. The method according to claim 14, wherein The method further includes: Collect the battery state information of the battery unit and feedback the battery state information to the middle computer.

18. The method according to claim 14, wherein The method further includes: Judge whether the charging duration for which the battery formation device charges the battery unit exceeds a preset duration; if so, send an alarm message to the middle computer; and receive an abort instruction sent by the middle computer based on the alarm message, and pause the AC-DC conversion module in the battery formation device.

19. The method according to claim 14, wherein The method further includes: Judge whether the output voltage of the battery unit exceeds the second voltage threshold; if so, send an alarm message to the middle computer; receive an abort instruction sent by the middle computer based on the alarm message, and pause the output of the battery unit according to the abort instruction.

20. A battery formation control system, characterized in that, It includes: The battery formation device according to any one of claims 1-13, and a middle computer; the middle computer is communicatively connected to the battery formation device; The middle computer is configured to send a charging control instruction or a discharging control instruction to the battery formation device; The battery formation device is configured to control the battery unit to discharge for the battery formation device according to the discharging control instruction; Or, the battery formation device is configured to control the battery formation device to charge the battery unit according to the charging control instruction.

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