Battery testing device and battery testing system

Abstract

The embodiment of the invention discloses a battery testing device and a battery testing system. The battery testing device comprises a plurality of first DC power supply modules, the input ends of which are connected to a power grid; the electric connecting piece is connected with the input ends of the plurality of batteries and connected with the output ends of the plurality of first direct-current power supply modules; the input ends of the second direct-current power supply modules are connected with the electric connecting piece, and the output ends of the second direct-current power supply modules are connected with the batteries in series in a one-to-one correspondence manner; wherein the plurality of second DC power supply modules includes a first battery test module and a second battery test module, the plurality of second DC power supply modules are configured to perform a discharge test when the first battery test module performs a charge test, and the second battery test module performs a discharge test when the second battery test module performs a discharge test. Discharging current of the second battery testing module flows to the first battery testing module through the electric connecting piece. According to the battery testing device and the battery testing system, the utilization efficiency of energy in the testing process can be improved, and the testing cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a battery testing device and a battery testing system. Background Art

[0002] In battery testing, multiple batteries are usually charged and discharged at the same time. In this process, there is often a huge energy consumption. These losses not only increase the cost of testing, but also lead to waste of resources, which has an adverse impact on the economy and the environment. Therefore, how to improve the energy utilization efficiency during the test process and reduce the test cost is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The embodiments of the present application provide a battery testing device and a battery testing system, which can improve the energy utilization efficiency during the testing process and reduce the testing cost.

[0004] In a first aspect, the present application provides a battery testing device, comprising: a plurality of first DC power supply modules, whose input ends are connected to a power grid; an electrical connector, which is connected to the output ends of the plurality of first DC power supply modules, so that the plurality of first DC power supply modules are connected in parallel with each other; a plurality of second DC power supply modules, whose input ends are connected to the electrical connector, and whose output ends are connected in series with a plurality of batteries in a one-to-one correspondence; wherein the plurality of second DC power supply modules include a first battery testing module and a second battery testing module, and the plurality of second DC power supply modules are configured such that when the first battery testing module performs a charging test, the second battery testing module performs a discharging test, and the discharge current of the second battery testing module flows to the first battery testing module through the electrical connector.

[0005] In the technical solution of the embodiment of the present application, the first battery test module may refer to a second DC power module correspondingly connected to the charging battery among the plurality of second DC power modules; the second battery test module may refer to a second DC power module correspondingly connected to the discharging battery among the plurality of second DC power modules. The plurality of second DC power modules are all connected to the electrical connector, so that the energy of the discharging battery among the plurality of batteries can flow to the electrical connector, and flow to other batteries being charged through the electrical connector, so that the energy of the charging and discharging process of the plurality of batteries can flow on the electrical connector, and the energy of the discharging battery can be used by the charging battery without returning to the power grid first, and then being converted by the first DC power module and then provided to the battery to be charged, thereby improving the efficiency of the entire charging and discharging process, and reducing the electric energy obtained from the power grid by reducing the number of the first DC power modules, improving the utilization rate of energy, reducing the waste of resources, and reducing the cost of battery charging and discharging testing.

[0006] In some embodiments of the first aspect, the first DC power supply module is used to convert a first voltage into a second voltage, and a current flows from an input end of the first DC power supply module to an output end of the first DC power supply module; or, the first DC power supply module is used to convert the second voltage into the first voltage, and a current flows from the output end of the first DC power supply module to the input end of the first DC power supply module; the first voltage is greater than the second voltage.

[0007] In the embodiment of the present application, through the boost mode and the buck mode of the first DC power supply module, on the one hand, the first DC power supply module adapts the high voltage from the power grid to a low voltage suitable for battery charging, which can ensure the normal charging of the battery and provide a stable charging and discharging environment for multiple batteries; on the other hand, the first DC power supply module boosts the low voltage from the battery to adapt to the high voltage of the power grid, and can transfer part of the energy discharged by the battery back to the power grid, which can reduce energy loss.

[0008] In some embodiments of the first aspect, the total power of the multiple first DC power supply modules is greater than or equal to the actual usage power, and the actual usage power is the absolute value of the difference between the total charging power of the multiple batteries and the total discharging power of the multiple batteries.

[0009] In the embodiment of the present application, compared with configuring according to the charging power required by each of the multiple batteries, the total power of the multiple first DC power supply modules can meet the charging demand as long as it is greater than the charging power actually required by the multiple batteries. Therefore, the charging and discharging process of multiple batteries can be realized by configuring fewer first DC power supply modules, which can reduce the use of first DC power supply modules and reduce the cost of battery charging and discharging testing.

[0010] In some embodiments of the first aspect, a ratio of the total power of the plurality of first DC power supply modules to the total rated power of the plurality of batteries is in a range of [0.3, 0.5].

[0011] In an embodiment of the present application, by setting the ratio of the total power of multiple first DC power supply modules to the total rated power of multiple batteries to be greater than or equal to 0.3, sufficient charging power can be provided for the multiple batteries to ensure stable and efficient operation of the entire test system; by setting the ratio of the total power of multiple first DC power supply modules to the total rated power of multiple batteries to be less than or equal to 0.5, the use of first DC power supply modules can be reduced while ensuring stable and efficient operation of the test system, thereby reducing equipment costs and improving resource utilization efficiency.

[0012] In some embodiments of the first aspect, the first battery test module is used to convert the third voltage into a fourth voltage, and the current flows from the input end of the first battery test module to the output end of the first battery test module; the second battery test module is used to convert the fourth voltage into the third voltage, and the current flows from the output end of the second battery test module to the input end of the second battery test module; the third voltage is greater than the fourth voltage.

[0013] In the embodiment of the present application, the first battery test module can adapt the high voltage to a low voltage suitable for the battery for direct use by the battery, providing a more stable working environment for battery charging and discharging, and the second battery test module can boost the low voltage of the battery discharge for discharge energy recovery. In addition, by gradually reducing the voltage at two stages through the first DC power supply module and the first battery test module or by gradually boosting the voltage at two stages through the second battery test module and the first DC power supply module, during the battery charging and discharging process, a higher voltage is gradually reduced to a voltage suitable for the battery, or a lower voltage is gradually increased to a voltage suitable for the power grid, which can ensure the stable operation of the battery, reduce energy loss during the charging and discharging process, and improve overall energy efficiency.

[0014] In some embodiments of the first aspect, the power of the second DC power supply module is greater than or equal to the rated power of a battery correspondingly connected to the second DC power supply module.

[0015] In the embodiment of the present application, by configuring sufficient power for the second DC power supply module, it is possible to ensure that the battery connected thereto can be normally charged and discharged, thereby ensuring that the test system can operate stably and reliably.

[0016] In some embodiments of the first aspect, when the total discharge power of the multiple batteries is greater than the total charging power of the multiple batteries, a partial discharge current of the second battery test module flows to the power grid through the electrical connector and the first DC power supply module.

[0017] In the embodiment of the present application, when the energy released by the discharge battery is preferentially provided to the charge battery for use, the excess discharge energy is recovered to the power grid, which can reduce energy loss and further improve energy utilization.

[0018] In some embodiments of the first aspect, when the total discharge power of the multiple batteries is less than or equal to the total charging power of the multiple batteries, the discharge current of the second battery test module flows to the first battery test module through the electrical connector; and / or the current of the power grid flows to the first battery test module through the multiple first DC power supply modules and the electrical connector.

[0019] In the embodiment of the present application, during the battery charging and discharging process, the energy released by the discharging battery will be used by other charging batteries first. When the discharge energy is greater than the required charging energy, the excess discharge energy will be recycled to the power grid. Therefore, by directly circulating the discharge energy of the battery inside the charging and discharging equipment, the energy flow back and forth from the power grid can be reduced, the energy utilization efficiency is improved, and the energy obtained from the power grid can be reduced, further reducing the testing cost.

[0020] In some embodiments of the first aspect, the rated current of the electrical connector is greater than or equal to 600A.

[0021] In the embodiment of the present application, the current that can pass through the electrical connector is at least 600A, thereby providing a reliable energy flow platform for charging and discharging multiple batteries and improving the energy utilization efficiency during the battery charging and discharging process.

[0022] In some embodiments of the first aspect, the material of the electrical connector is copper.

[0023] In the embodiment of the present application, red copper is a high-purity copper material with good electrical conductivity and thermal conductivity. It can meet the passage of large currents while effectively transferring heat, reducing thermal resistance, improving heat dissipation efficiency, and further improving the safety performance of the battery testing device.

[0024] In some embodiments of the first aspect, the battery testing device also includes an AC / DC power supply module, an output end of the AC / DC power supply module is connected to an input end of the plurality of first DC power supply modules, and an input end of the AC / DC power supply module is connected to the power grid; the AC / DC power supply module is used to convert AC power from the power grid into DC power, and convert a fifth voltage into a sixth voltage; or, the AC / DC power supply module is used to convert DC power from the first DC power supply module into AC power, and convert the sixth voltage into the fifth voltage; the fifth voltage is less than the sixth voltage.

[0025] In the embodiment of the present application, the AC / DC power supply module is used to boost the AC power from the power grid, which can reduce the energy consumption of the charging process and improve the charging efficiency and charging speed of the battery. In addition, the AC / DC power supply module converts the AC power into DC power, which can provide a stable voltage for battery charging and ensure the stable operation of the battery charging and discharging process.

[0026] In some embodiments of the first aspect, the battery testing device further includes: a plurality of switch elements, the plurality of switch elements being connected in series with the plurality of first DC power supply modules in a one-to-one correspondence; and a control module, the control module being used to control the on and off of the plurality of switch elements.

[0027] In an embodiment of the present application, when the energy released by a discharge battery among multiple batteries is insufficient to meet the charging energy required by the rechargeable battery, the control module can control the switching elements corresponding to the multiple first DC power supply modules to close, thereby increasing the number of operating first DC power supply modules in the battery testing device, thereby ensuring that the charging and discharging of the multiple batteries can proceed smoothly; when the energy released by a discharge battery among multiple batteries is much greater than the charging energy required by the rechargeable battery, the control module can control the switching elements corresponding to the multiple first DC power supply modules to disconnect, thereby reducing the number of operating first DC power supply modules in the battery testing device, thereby ensuring that the charging and discharging of the multiple batteries can proceed smoothly, while minimizing unnecessary waste of resources and reducing testing costs.

[0028] In some embodiments of the first aspect, the battery testing device also includes: a monitoring module, which is used to monitor the charging power and discharging power of the multiple batteries and calculate the actual power usage, which is the difference between the total charging power of the multiple batteries and the total discharging power of the multiple batteries; an early warning module, which is used to alarm the control module when the actual power usage is greater than or equal to a first threshold; wherein the control module is also used to control one or more of the switching elements to close so as to increase the operating number of the first DC power supply module.

[0029] In an embodiment of the present application, the control module controls one or more switch elements to close according to the alarm information of the early warning module, thereby increasing the number of operating first DC power supply modules and providing sufficient charging power for the battery to ensure stable operation of the charging and discharging process.

[0030] In some embodiments of the first aspect, the early warning module is also used to alarm the control module when the actual power usage is less than a second threshold; wherein the control module is also used to control one or more of the switching elements to disconnect so as to reduce the number of operations of the first DC power supply module.

[0031] In an embodiment of the present application, the control module controls one or more switching elements to disconnect according to the alarm information of the early warning module, thereby reducing the number of operating first DC power supply modules, ensuring the stable operation of the charging and discharging process, reducing the waste of resources, and reducing unnecessary testing costs.

[0032] In a second aspect, the present application provides a battery testing system, comprising a plurality of batteries and a battery testing device according to the first aspect or any one embodiment of the first aspect, wherein the battery testing device is used to perform charge and discharge tests on the plurality of batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the structure of a battery testing system according to an embodiment of the present application; Figure 2 A schematic diagram of the structure of a battery testing device according to an embodiment of the present application; Figure 3 A schematic diagram of energy flow in a battery testing device according to an embodiment of the present application; Figure 4 A schematic diagram of energy flow in a battery testing device according to another embodiment of the present application; Figure 5 A schematic diagram of energy flow in a battery testing device according to another embodiment of the present application; Figure 6 A schematic structural diagram of a battery testing device according to another embodiment of the present application; Figure 7 This is a structural schematic diagram of a battery testing device according to another embodiment of the present application; Figure 8 This is a structural schematic diagram of a battery testing device according to another embodiment of the present application; Fig. 9 This is a schematic structural diagram of a battery testing device according to another embodiment of the present application.

[0034] In the drawings, the figures are not drawn to actual scale; Reference numerals: 10-battery testing system; 100-battery testing device; 200-battery; 110-first DC power supply module; 120-electrical connector; 130-second DC power supply module; 131-first battery testing module; 132-second battery testing module; 140-AC / DC power supply module; 150-switching element; 160-control module; 170-monitoring module; 180-early warning module. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0038] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0039] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] The term "and / or" in this application is only 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 at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0041] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0042] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0043] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0044] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0045] If there is no special explanation, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, it is mentioned that the method may also include step (c), which means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0046] At present, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding. In the battery production process, in order to make the output products meet the production requirements, the battery needs to be charged and discharged. Battery charge and discharge test is a method to evaluate battery performance. It is mainly used to detect key parameters such as battery capacity, voltage, internal resistance, as well as battery cycle life, charge and discharge efficiency and safety. In the battery charge and discharge test, the required charge and discharge power of a single test battery is generally used as the benchmark to obtain charging energy from the power grid, but in this case, part of the energy is not fully utilized, resulting in a waste of resources.

[0047] Therefore, the present application provides a battery testing device and a battery testing system, which can solve the above problems. The battery testing device of the embodiment of the present application includes multiple first DC power modules, electrical connectors and multiple second DC power modules. The input ends of the multiple first DC power modules are connected to the power grid; the electrical connector is connected to the output ends of the multiple first DC power modules, so that the multiple first DC power modules are connected in parallel with each other; the input ends of the multiple second DC power modules are connected to the electrical connector, and the output ends of the multiple second DC power modules are connected in series with multiple batteries one by one; wherein the multiple second DC power modules include a first battery test module and a second battery test module, and the multiple second DC power modules are configured such that when the first battery test module performs a charging test, the second battery test module performs a discharging test, and the discharge current of the second battery test module flows to the first battery test module through the electrical connector. By setting an electrical connector to connect multiple first DC power modules in parallel, and connecting multiple second DC power modules to the electrical connector, the energy of the discharge battery in the multiple batteries can flow to other rechargeable batteries through the electrical connector for charging the batteries, thereby realizing the internal flow of energy in the device, without the need to first flow all the energy of the discharge battery back to the power grid and then feed it back to the battery for charging through the power grid, thereby improving the energy utilization efficiency and the efficiency of the charging and discharging process and reducing the cost of battery charging and discharging testing.

[0048] The battery in the embodiment of the present application may refer to a battery cell, or may refer to a battery module or a battery device formed by connecting a plurality of battery cells in series, in parallel or in a mixed manner.

[0049] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0050] The technical solutions described in the embodiments of this application are applicable to various battery testing systems. The battery testing system can simulate the working conditions of the battery in actual use, and evaluate the performance of the battery by measuring and recording the battery's voltage, current, capacity, energy density, power density and other parameters, including battery charge and discharge performance, cycle stability, high and low temperature adaptability, etc. Figure 1 As shown, Figure 1 A schematic diagram of a battery testing system 10 of an embodiment of the present application is shown. The battery testing system includes a battery testing device 100 and multiple batteries 200. The multiple batteries 200 are connected to the battery testing device 100. The battery testing device 100 performs charge and discharge tests on the multiple batteries 200 to evaluate the performance and health of the batteries.

[0051] The present application embodiment provides a battery testing device, such as Figure 2 and Figure 3As shown, the battery testing device 100 may include a plurality of first DC power modules 110, the input ends of the plurality of first DC power modules 110 are connected to the power grid; an electrical connector 120, the electrical connector 120 is connected to the output ends of the plurality of first DC power modules 110, so that the plurality of first DC power modules 110 are connected in parallel with each other; a plurality of second DC power modules 130, the input ends of the plurality of second DC power modules 130 are connected to the electrical connector 120, and the output ends of the plurality of second DC power modules 130 are connected in series with a plurality of batteries 200 in a one-to-one correspondence; wherein the plurality of second DC power modules 130 include a first battery testing module 131 and a second battery testing module 132, and the plurality of second DC power modules 130 are configured such that when the first battery testing module 131 performs a charging test, the second battery testing module 132 performs a discharging test, and the discharge current of the second battery testing module 132 flows to the first battery testing module 131 through the electrical connector 120.

[0052] It should be understood that the first DC power supply module 110 is a multifunctional, high-efficiency, and high-stability power conversion device. The first DC power supply module 110 can convert and adjust the voltage, can provide different output voltages for different devices and circuits, and can provide appropriate current according to the requirements of the load. The input ends of multiple first DC power supply modules 110 are connected to the power grid, which can refer to the input ends of multiple first DC power supply modules 110 being directly connected to the power grid, or indirectly connected to the power grid through other power modules, so as to output a suitable voltage for multiple batteries 200 to perform charge and discharge tests.

[0053] The electrical connector 120 refers to a metal part with conductive properties, and the output ends of the multiple first DC power modules 110 are all connected to the electrical connector, so that the multiple first DC power modules 110 can be connected in parallel. Compared with one first DC power module 110 that can only provide power to the multiple batteries 200 connected to it, the multiple first DC power modules 110 can provide power to all batteries 200 after being connected in parallel, so that the power can be automatically distributed to any battery with insufficient charging power, and sufficient and stable power can be provided to the multiple batteries 200, thereby improving the efficiency of battery charging and discharging.

[0054] The second DC power supply module 130 is similar to the first DC power supply module 110, and is also a multifunctional, high-efficiency, and high-stability power conversion device. The second DC power supply module 130 can also convert and adjust the voltage, can provide different output voltages for the requirements of different devices and circuits, and can provide appropriate current according to the requirements of the load. A plurality of second DC power supply modules 130 are connected in series with a plurality of batteries one by one, and their input ends are all connected to the electrical connector 120, so that a connection loop can be formed between the charging batteries and the discharging batteries in the plurality of batteries 200, so that the discharge current of the discharging battery passes through the corresponding second DC power supply module 130, and flows into the second DC power supply module 130 corresponding to the charging battery through the electrical connector 120, so as to perform a charging test on the charging battery. In addition, the number of the second DC power supply modules 130 and the battery 200 is the same, so that each battery 200 corresponds to a second DC power supply module 130 connected in series.

[0055] It should be understood that the second DC power supply module 130 can perform a charging test or a discharging test. When the battery corresponding to the second DC power supply module 130 needs to be charged, the second DC power supply module 130 is configured as a first battery test module 131 to perform a charging test on the battery; when the battery corresponding to the second DC power supply module 130 needs to be discharged, the second DC power supply module 130 is configured as a second battery test module 132 to perform a discharging test on the battery. In other words, the first battery test module 131 refers to the second DC power supply module 130 corresponding to the charging battery among the plurality of second DC power supply modules 130; the second battery test module may refer to the second DC power supply module 130 corresponding to the discharging battery among the plurality of second DC power supply modules 130. The plurality of second DC power supply modules 130 are configured such that when the first battery test module 131 performs a charging test, the second battery test module 132 performs a discharging test, that is, during the battery test process, charging of some batteries and discharging of some batteries may be performed simultaneously.

[0056] The discharge current of the second battery test module 132 flows to the first battery test module 131 through the electrical connector 120, that is, the battery corresponding to the second battery test module 132 is in a discharge state, and the battery corresponding to the first battery test module 131 is in a charge state, so that the discharge current of the battery tested by the second battery test module 132 can flow to the rechargeable battery tested by the first battery test module 131 through the electrical connector 120, so that the energy of the discharge battery can flow internally between the charge and discharge batteries without flowing into the power grid through the first DC power supply module 110, thereby improving the energy utilization efficiency.

[0057] It should be understood that the discharge current of the second battery test module 132 flows to the first battery test module 131 through the electrical connector 120, which may refer to that the energy of the discharge batteries in the multiple batteries 200 flows into the rechargeable battery through the electrical connector 120 for charging the rechargeable battery, or may refer to that part of the energy of the discharge batteries in the multiple batteries 200 flows into the rechargeable battery for charging the rechargeable battery, while the other part of the energy may flow into the first DC power module 110 through the electrical connector 120 and flow into the power grid for recovery. For example, in the case where the total discharge power of the discharge batteries in the multiple batteries 200 is greater than the total charging power of the rechargeable batteries in the multiple batteries 200, the excess energy may flow into the first DC power module 110 through the electrical connector 120 and flow into the power grid for recovery.

[0058] There are often some batteries in the multiple batteries 200 that are being charged while others are being discharged. By connecting the input ends of the multiple batteries 200 to the electrical connector 120, the energy of the discharged batteries in the multiple batteries 200 flows to the electrical connector 120, and then flows to other batteries being charged through the electrical connector 120, so that the energy of the multiple batteries 200 can flow on the electrical connector 120 during the charging and discharging process without first returning to the power grid, and then providing the energy to the battery that needs to be charged after conversion through the first DC power module 110, thereby improving the efficiency of the entire charging and discharging process.

[0059] In addition, in order to ensure that the battery 200 has a stable and sufficient charging power, the charging energy is generally obtained from the power grid based on the maximum rated power required by a single battery 200. However, in the actual battery charge and discharge test, all test batteries will hardly be charged or discharged at the same time, resulting in the energy provided by the power grid not being fully utilized by multiple batteries 200, resulting in a waste of some resources. By setting the electrical connector 120, energy can be transferred between multiple batteries 200, and the energy of the discharged battery can be used by the charged battery, so that the electric energy obtained from the power grid can be reduced by reducing the number of the first DC power supply modules 110, thereby improving the utilization rate of energy, reducing the waste of resources, and reducing the cost of battery charge and discharge testing.

[0060] In some embodiments, the first DC power supply module 110 can be used to convert a first voltage into a second voltage, and current flows from the input end of the first DC power supply module 110 to the output end of the first DC power supply module 110; or, the first DC power supply module 110 is used to convert the second voltage into a first voltage, and current flows from the output end of the first DC power supply module 110 to the input end of the first DC power supply module 110; the first voltage is greater than the second voltage.

[0061] It should be understood that in the process of the battery testing device 100 acquiring electric energy from the power grid to charge the battery 200, the current flows from the input end of the first DC power module 110 to the output end of the first DC power module 110, and the working mode of the first DC power module 110 is a step-down mode of the current from the input end to the output end. The first DC power module 110 adapts the high voltage from the power grid to a low voltage suitable for charging the battery 200, which can ensure the normal charging of the battery 200 and provide a stable charging and discharging environment for multiple batteries 200. In the process of discharging the battery 200, the current can also flow from the output end of the first DC power module 110 to the input end of the first DC power module 110. At this time, the working mode of the first DC power module 110 is changed to a step-up mode of the current from the output end to the input end. The first DC power module 110 boosts the low voltage from the battery 200 to adapt to the high voltage of the power grid, and can transfer part of the energy discharged by the battery 200 back to the power grid, which can reduce energy loss.

[0062] Through the boost mode and the buck mode of the first DC power module 110, when the total discharge power of all the discharge batteries in the multiple batteries 200 is greater than the total charging power of all the rechargeable batteries in the multiple batteries 200, the discharge energy of some batteries can flow directly between the discharge batteries and the rechargeable batteries through the electrical connector 120 for charging the rechargeable batteries, and a part of the unused discharge energy can flow back to the power grid through the first DC power module 110 to reduce unnecessary energy loss; when the total discharge power of all the discharge batteries in the multiple batteries 200 is less than the total charging power of all the rechargeable batteries in the multiple batteries 200, the charging energy of some batteries can be directly obtained from the discharge batteries through the electrical connector 120, and a part of the charging energy can be obtained from the power grid through the first DC power module 110 to provide sufficient charging energy for the rechargeable batteries.

[0063] In this way, the power configured for the first DC power supply module 110 is no less than the total charging power actually required by the multiple batteries 200 to ensure that the charging and discharging processes of all the batteries 200 can proceed smoothly.

[0064] In some embodiments, the total power of the plurality of first DC power modules 110 is greater than or equal to the actual power used, and the actual power used is the absolute value of the difference between the total charging power of the plurality of batteries 200 and the total discharging power of the plurality of batteries 200. The total charging power refers to the sum of the charging power of all the batteries 200 being charged among the plurality of batteries 200, and the total discharging power refers to the sum of the discharging power of all the batteries 200 being discharged among the plurality of batteries 200.

[0065] It should be understood that when the total charging power of multiple batteries 200 is greater than the total discharging power of multiple batteries 200, the total power of multiple first DC power modules 110 is greater than or equal to the actual power used. The actual power used can be understood as the additional charging power provided by the power grid in addition to the partial power obtained by all rechargeable batteries from the discharge energy of the discharge battery through the electrical connector 120. That is, in this case, the power of multiple first DC power modules 110 is obtained from the power grid and provided to the rechargeable batteries for charging; and when the total charging power of multiple batteries 200 is less than or equal to the total discharging power of multiple batteries 200, the charging energy required by all rechargeable batteries can be obtained from the discharge energy of the discharge battery through the electrical connector 120, without the need for the first DC power module 110 to obtain additional power from the power grid. In this case, the total power of multiple first DC power modules 110 is the inverse of the actual power used. The inverse of the actual power used can be understood as the discharge energy of all discharge batteries, in addition to being provided to all rechargeable batteries for charging through the electrical connector 120, the remaining unused discharge energy flows into the power grid through the first DC power module 110 for recovery. That is, in this case, the power of the multiple first DC power modules 110 is obtained from the discharge battery and output to the power grid. However, in actual applications, the total charging power of the multiple batteries 200 is much greater than the total charging power of the multiple batteries 200, so the actual power usage often appears in the form of a positive value.

[0066] It should be understood that the total power of the multiple first DC power modules 110 can be adjusted accordingly by increasing or decreasing the number of the first DC power modules 110. Therefore, it is only necessary to configure the total power of the multiple first DC power modules 110 to be greater than or equal to the actual power used to ensure the normal charging and discharging process of all batteries 200. Compared with configuring according to the charging power required by each battery in the multiple batteries 200, the total power of the multiple first DC power modules 110 can meet the charging demand as long as it is greater than the actual charging power required by the multiple batteries 200, so that the charging and discharging process of multiple batteries 200 can be realized by configuring fewer first DC power modules 110, which can reduce the use of the first DC power modules 110 and reduce the cost of battery charging and discharging testing.

[0067] In some embodiments, the ratio of the total power of the plurality of first DC power modules 110 to the total rated power of the plurality of batteries 200 is in the range of [0.3, 0.5]. It should be understood that the total rated power refers to the sum of the maximum rated powers of the plurality of batteries 200 when all are in a charging state, or the total rated power refers to the sum of the maximum rated powers of the plurality of batteries 200 when all are in a discharging state. In a battery testing system, a batch of batteries are generally charged and discharged at the same time. Therefore, there are always charging batteries and discharging batteries at the same time, and the actual power used by the plurality of batteries 200 is often much less than the total rated power of the plurality of batteries 200. By setting the ratio of the total power of the plurality of first DC power modules 110 to the total rated power of the plurality of batteries 200 to be greater than or equal to 0.3, sufficient charging power can be provided for the plurality of batteries 200 to ensure the stable and efficient operation of the entire testing system; by setting the ratio of the total power of the plurality of first DC power modules 110 to the total rated power of the plurality of batteries 200 to be less than or equal to 0.5, the use of the first DC power modules 110 can be reduced while ensuring the stable and efficient operation of the testing system, which can reduce the equipment cost and improve the utilization efficiency of resources.

[0068] In some embodiments, the first battery testing module 131 is used to convert the third voltage into a fourth voltage, and the current flows from the input end of the first battery testing module 131 to the output end of the first battery testing module 131; the second battery testing module 132 is used to convert the fourth voltage into the third voltage, and the current flows from the output end of the second battery testing module 132 to the input end of the second battery testing module 132; the third voltage is greater than the fourth voltage.

[0069] It should be understood that the second DC power supply module 130 has two working modes: boost and buck. When the second DC power supply module 130 is configured as the first battery test module 131, the second DC power supply module 130 executes the buck mode, that is, converts the third voltage into the fourth voltage, and the current flows from its input end to the output end; when the second DC power supply module 130 is configured as the second battery test module 132, the second DC power supply module 130 executes the boost mode, that is, converts the fourth voltage into the third voltage, and the current flows from its output end to the input end.

[0070] In some embodiments, the voltage value of the third voltage may be equal to the voltage value of the second voltage. In the process of obtaining electric energy from the power grid for charging the battery 200, the first voltage is once stepped down by the first DC power module 110 to be converted into the second voltage or the third voltage, and then the second voltage or the third voltage is once again stepped down by the second DC power module 130 to be converted into the fourth voltage for charging the battery 200. Alternatively, the fourth voltage may be stepped up by the second DC power module 130 to be converted into the third voltage or the second voltage, and then the second voltage or the third voltage may be stepped up by the first DC power module 110 to be converted into the first voltage, thereby returning the discharge energy of the battery 200 to the power grid.

[0071] In some embodiments, the voltage value of the third voltage may also be less than the voltage value of the second voltage. The first DC power supply module 110 and the second DC power supply module 130 may also be connected through other DC power supply modules with the same performance as the first DC power supply module 110 or the second DC power supply module 130. In the process of obtaining electric energy from the power grid to charge the battery 200, the first voltage is once reduced by the first DC power supply module 110 to be converted to the second voltage, and the second voltage is gradually reduced by one or more other DC power supply modules to be converted to the third voltage, and then the third voltage is once again reduced by the second DC power supply module 130 to be converted to the fourth voltage for battery charging. It is also possible to convert the fourth voltage to the third voltage by the second DC power supply module 130 through the reverse process, and then the third voltage is once or multiple times increased by one or more other DC power supply modules to be converted to the second voltage, and then the second voltage is increased by the first DC power supply module 110 to be converted to the first voltage, so that the discharge energy of the battery 200 flows back to the power grid.

[0072] The first battery test module can adapt the high voltage to a low voltage suitable for the battery 200 for direct use by the battery 200, providing a more stable working environment for battery charging and discharging, and the second battery test module can boost the low voltage of the battery discharge for discharge energy recovery. In addition, by gradually reducing the voltage at two levels through the first DC power supply module and the first battery test module or gradually boosting the voltage at two levels through the second battery test module and the first DC power supply module, during the battery charging and discharging process, a higher voltage is gradually reduced to a voltage suitable for the battery, or a lower voltage is gradually increased to a voltage suitable for the power grid, which can ensure the stable operation of the battery 200, reduce energy loss during the charging and discharging process, and improve overall energy efficiency.

[0073] In some embodiments, the power of the second DC power module 130 is greater than or equal to the rated power of the battery connected to the second DC power module 130. By configuring sufficient power for the second DC power module 130, it is possible to ensure that the battery 200 connected to it is normally charged and discharged, and to ensure that the test system can operate stably and reliably.

[0074] It should be understood that the energy of all the batteries 200 being charged in the multiple batteries 200 comes from the energy released by other batteries 200 being discharged, or from the energy obtained from the power grid. If the sum of the discharge power of the batteries 200 currently discharging is greater than the sum of the charging power of the batteries 200 currently charging, part of the energy in all the discharging batteries will flow directly to the charging batteries through the electrical connector 120 for charging, and the remaining excess energy will be fed back to the power grid through the first DC power module 110. The specific energy flow diagram can be shown as follows: Figure 3 and Figure 4 shown.

[0075] In some embodiments, when the total discharge power of the plurality of batteries 200 is greater than the total charging power of the plurality of batteries 200, a portion of the discharge current of the second battery test module 132 flows through the electrical connector 120 and to the first battery test module 131 to charge the corresponding rechargeable battery, and the energy flows to the first battery test module 131. Figure 3 The direction indicated by the arrow.

[0076] By transferring the battery discharge energy internally to charge the rechargeable battery without first returning to the power grid and then feeding it back to the rechargeable battery from the power grid, the energy flow path is shortened and the energy utilization efficiency is improved.

[0077] In some embodiments, when the total discharge power of the multiple batteries 200 is greater than the total charging power of the multiple batteries 200, part of the discharge current of the second battery test module 132 can also flow into the power grid through the electrical connector 120 and the first DC power supply module 110, and its energy flow direction is as follows: Figure 4 The direction indicated by the arrow.

[0078] When the energy released by the discharge battery is provided to the charging battery first, the excess discharge energy is recovered to the power grid, which can reduce energy loss and further improve energy utilization.

[0079] In addition, if the sum of the discharge powers of the batteries 200 currently being discharged is smaller than the sum of the charging powers of the batteries 200 currently being charged, the discharge currents of all the second battery test modules 132 flow to all or part of the first battery test modules 131 through the electrical connector 120, and the current in the power grid flows to part of the first battery test modules 131 through the first DC power supply module 110 and the electrical connector 120. That is, the energy released by all the discharged batteries will flow to the charging batteries through the electrical connector 120 for charging, and the first DC power supply module 110 will also obtain part of the energy from the power grid to provide sufficient charging energy for the charging batteries. The specific energy flow diagram can be shown as follows: Figure 5 shown.

[0080] In some embodiments, when the total discharge power of the multiple batteries 200 is less than or equal to the total charging power of the multiple batteries 200, the discharge current of the second battery test module 132 flows to the first battery test module 131 through the electrical connector 120; and / or, the current of the power grid flows to the first battery test module 131 through the multiple first DC power modules 110 and the electrical connector 120. That is, the energy of the discharge batteries in the multiple batteries 200 passes through the second DC power module 130 and the electrical connector 120 connected to the discharge batteries, and flows into the rechargeable batteries in the multiple batteries 200 for charging the rechargeable batteries; and / or, the energy of the power grid passes through the multiple first DC power modules 110 and the multiple second DC power modules 130 to charge the rechargeable batteries in the multiple batteries. For example, Figure 5 As shown, taking the test system having four batteries as an example, three of the batteries are being charged, and the corresponding second DC power supply module 130 is configured as a first battery test module 131; one battery is being discharged, and the corresponding second DC power supply module is configured as a second battery test module 132. The energy released by the discharged battery can be transferred to the electrical connector 120 through the second DC power supply module 130 connected thereto, and can flow to any one of the other three batteries being charged through the electrical connector 120 for charging. In addition, the energy of the remaining two rechargeable batteries is obtained from the power grid, and can flow to the remaining two rechargeable batteries for charging through the first DC power supply module 110 and the electrical connector 120, as well as the second DC power supply module 130 connected to the rechargeable battery.

[0081] It should be understood that during the flow of energy through the electrical connector 120, it is not necessarily that the energy of a discharge battery is directed to flow to a rechargeable battery. It is also possible that part of the energy of a discharge battery flows to a rechargeable battery, while the other part of the energy flows to one or more other rechargeable batteries.

[0082] During the battery charging and discharging process, the energy released by the discharging battery will be used by other charging batteries first. When the discharge energy is greater than the required charging energy, the excess discharge energy will be recycled to the power grid. Therefore, by directly circulating the battery discharge energy inside the charging and discharging equipment, it can reduce the energy flowing back and forth from the power grid, improve the energy utilization efficiency, and reduce the energy obtained from the power grid, further reducing the testing cost.

[0083] It should be understood that the electrical connector 120 can pass high-power current, so that energy can flow between various devices through the electrical connector 120. In some embodiments, the rated current of the electrical connector 120 is greater than or equal to 600A. That is, the current that can pass through the electrical connector 120 is at least 600A, thereby providing a reliable energy flow platform for charging and discharging multiple batteries 200, and improving the energy utilization efficiency during the battery charging and discharging process.

[0084] In addition, the material of the electrical connector 120 may include metal materials such as copper, silver, and aluminum. In some embodiments, the material of the electrical connector 120 may be red copper. Red copper is a high-purity copper material with good electrical conductivity and thermal conductivity. It can meet the requirements of large currents while effectively transferring heat, reducing thermal resistance, and improving heat dissipation efficiency, thereby further improving the safety performance of the battery testing device.

[0085] In some embodiments, Figure 6 As shown, the battery testing device 100 may further include an AC / DC power supply module 140, the output end of the AC / DC power supply module 140 is connected to the input end of multiple first DC power supply modules 110, and the input end of the AC / DC power supply module 140 is connected to the power grid; the AC / DC power supply module 140 is used to convert the AC power from the power grid into DC power, and convert the fifth voltage into the sixth voltage; or, the AC / DC power supply module 140 is used to convert the DC power from the first DC power supply module 110 into AC power, and convert the sixth voltage into the fifth voltage; the fifth voltage is less than the sixth voltage.

[0086] It should be understood that the AC / DC power supply module 140 is also a power conversion device that can convert and adjust voltage, can provide different output voltages for different devices and circuits, and can also realize the conversion between AC power and DC power. The AC / DC power supply module 140 can also have two working modes: boost and buck.

[0087] In some embodiments, the voltage value of the sixth voltage may be equal to the voltage value of the first voltage. In the process of obtaining electric energy from the power grid to charge the battery 200, the AC / DC power supply module 140 may convert the AC power in the power grid into DC power and perform a voltage boost process. For example, the fifth voltage is boosted and converted to the sixth voltage or the first voltage by the AC / DC power supply module 140, and then the first voltage or the sixth voltage is bucked and converted to the second voltage by the first DC power supply module 110 for charging the battery 200. Or through the reverse process, the second voltage is boosted and converted to the first voltage or the sixth voltage by the first DC power supply module 110, and then the sixth voltage or the first voltage is bucked and converted to the fifth voltage by the AC / DC power supply module 140. For another example, the fifth voltage can be boosted and converted to the sixth voltage or the first voltage by the AC / DC power supply module 140, the first DC power supply module 110 and the second DC power supply module 130 in sequence, and then the first voltage or the sixth voltage is bucked and converted to the fourth voltage for charging the battery 200. The discharge energy of the battery 200 can also be returned to the power grid by performing the reverse process of boosting and then reducing the voltage once, twice or multiple times in sequence.

[0088] In some embodiments, the voltage value of the sixth voltage may also be greater than the voltage value of the first voltage. The AC / DC power supply module 140 and the first DC power supply module 110 may also be connected through other DC power supply modules with the same performance as the first DC power supply module 110 or the second DC power supply module 130. In the process of obtaining electric energy from the power grid to charge the battery 200, the fifth voltage is boosted and converted to the sixth voltage through the AC / DC power supply module 140, and the sixth voltage is gradually reduced to the first voltage through one or more other DC power supply modules, and then the first voltage is reduced and converted to the second voltage through the first DC power supply module 110. Or through the reverse process, the second voltage is boosted and converted to the first voltage through the first DC power supply module 110, and the first voltage is boosted and converted to the sixth voltage through one or more other DC power supply modules, and then the sixth voltage is reduced and converted to the fifth voltage through the AC / DC power supply module 140, so that the discharge energy of the battery 200 flows back to the power grid.

[0089] In some embodiments, the battery testing device 100 includes an AC / DC power module 140, a plurality of first DC power modules 110, and a plurality of second DC power modules 130. The voltage value of the first voltage is equal to the voltage value of the sixth voltage, and the voltage value of the second voltage is equal to the voltage value of the third voltage.

[0090] In some embodiments, when the total discharge power of the multiple batteries 200 is less than or equal to the total charging power of the multiple batteries 200, the energy of the discharge batteries in the multiple batteries 200 passes through the second DC power supply module 130 and the electrical connector 120 connected to the discharge batteries, and flows into the charging batteries in the multiple batteries 200 for charging the charging batteries; and / or, the energy of the power grid passes through the AC / DC power supply module, the multiple first DC power supply modules 110 and the multiple second DC power supply modules 130 to charge the charging batteries.

[0091] In the process of obtaining energy from the power grid to charge the battery, the fifth voltage is converted into the sixth voltage or the first voltage through the boost processing of the AC / DC power supply module 140, and the sixth voltage or the first voltage is converted into the second voltage or the third voltage through the step-down processing of the first DC power supply module 110, and the second voltage or the third voltage is converted into the fourth voltage through further step-down processing of the second DC power supply module 130 for battery charging.

[0092] In the process of the discharge energy of the discharge battery flowing back into the power grid, the fourth voltage is converted into the third voltage or the second voltage through the boost processing of the second DC power supply module 130, the third voltage or the second voltage is further converted into the first voltage or the sixth voltage through the further boost processing of the first DC power supply module 110, and the first voltage or the sixth voltage is converted into the fifth voltage through the step-down processing of the AC / DC power supply module 140, thereby flowing the energy into the power grid.

[0093] Taking the common 380V AC in the power grid as an example, the charging and discharging process of the battery that needs a stable supply of 5V DC is described. For example, the voltage value of the fifth voltage can be 380V, the first voltage or the sixth voltage can be 750V, the second voltage or the third voltage can be 15V, and the fourth voltage can be 5V. When charging the battery 200 through the power grid, the AC / DC power supply module 140 first converts the 380V AC into 750V DC, and then the first DC power supply module 110 converts the 750V DC into 15V DC, and then the second DC power supply module 130 converts the 15V DC into 5V DC for charging the battery 200; when the battery 200 discharges and flows energy back to the power grid, first the second DC power supply module 130 converts the 5V DC into 15V DC, and then the first DC power supply module 110 converts the 15V DC into 750V DC, and then the AC / DC power supply module 140 converts the 750V DC into 380V AC, so as to flow into the power grid.

[0094] By boosting the AC power from the power grid through the AC / DC power module 140, the energy consumption of the charging process can be reduced, and the charging efficiency and charging speed of the battery can be improved. In addition, by converting the AC power into DC power through the AC / DC power module, a stable voltage can be provided for battery charging, ensuring the stable operation of the battery charging and discharging process.

[0095] In some embodiments, Figure 7 As shown, the battery testing device 100 may further include a plurality of switch elements 150 and a control module 160 . The plurality of switch elements 150 are connected in series with the plurality of first DC power modules 110 in a one-to-one correspondence. The control module 160 is used to control the on and off of the plurality of switch elements 150 .

[0096] The switch element 150 may exist independently in the power control device or as part of the starter. It may be used to connect and disconnect the power line passing through the power line or repeatedly establish and interrupt the power circuit. It may be considered as the intersection of the control circuit and the power circuit, because it is controlled by the control circuit and controls the circuit between the power supply and the load.

[0097] In some embodiments, in a high-voltage circuit, the switch element 150 may be a contactor, a plastic case, etc.; in a low-voltage circuit, the switch element 150 may be a relay.

[0098] In some embodiments, the control module 160 can be a host computer or other device capable of sending operation instructions, and the host computer includes but is not limited to a smart terminal, a personal computer, a workbench, a processor, a wearable smart device, a laptop computer, and a server.

[0099] like Figure 7As shown, the control module 160 is connected to a plurality of switch elements 150 respectively, and can control the on and off of each switch element 150 individually, thereby controlling the operating state of the first DC power module 110, and dynamically adjusting the operating number of the first DC power module 110 during the charging and discharging process. When the energy released by the discharge battery in the plurality of batteries 200 is insufficient to meet the charging energy required by the rechargeable battery, the control module 160 can control the switch elements 150 corresponding to the plurality of first DC power modules 110 to close, so that the operating number of the first DC power modules 110 in the battery testing device 100 increases, thereby providing sufficient charging power for the rechargeable battery, and ensuring that the charging and discharging of the plurality of batteries 200 can proceed smoothly; when the energy released by the discharge battery in the plurality of batteries 200 is much greater than the charging energy required by the rechargeable battery, the control module 160 can also control the switch elements 150 corresponding to the plurality of first DC power modules 110 to disconnect, so that the operating number of the first DC power modules 110 in the battery testing device 100 decreases, thereby reducing the charging power provided to the rechargeable battery, ensuring that the charging and discharging of the plurality of batteries 200 can proceed smoothly, while minimizing unnecessary resource waste and reducing the testing cost.

[0100] In some embodiments, Figure 8 As shown, the battery testing device 100 may further include a monitoring module 170 and an early warning module 180. The monitoring module 170 is used to monitor the charging power and discharging power of the multiple batteries 200 and calculate the actual use power, which is the absolute value of the difference between the total charging power of the multiple batteries 200 and the total discharging power of the multiple batteries 200; the early warning module 180 is used to alarm the control module 160 when the actual use power is greater than or equal to the first threshold. The control module 160 is also used to control one or more switch elements 150 to close, so as to increase the number of operations of the first DC power supply module 110.

[0101] It should be understood that the monitoring module 170 can monitor in real time whether each battery 200 is currently in a charging state or a discharging state, collect the charging power or discharging power of each battery 200, and calculate the total power usage of all batteries 200 in real time. The early warning module 180 is based on the actual power usage of multiple batteries 200 calculated in real time by the monitoring module 170. When the actual power usage is greater than or equal to the first threshold, that is, the total charging power of all batteries 200 is greater than the total discharging power of all batteries 200, and the additional charging power required by all batteries 200 reaches the first threshold, the early warning module 180 alarms the control module 160. The control module 160 controls one or more switch elements 150 to close according to the alarm information of the early warning module 180, thereby increasing the number of operations of the first DC power supply module 110, providing sufficient charging power for the battery 200, and ensuring the stable operation of the charging and discharging process.

[0102] In some embodiments, the early warning module 180 is further used to warn the control module 160 when the actual power usage is less than the second threshold. The control module 160 is also used to control one or more switch elements 150 to be disconnected to reduce the number of operations of the first DC power supply module 110.

[0103] It should be understood that the second threshold should be less than the first threshold. The early warning module 180 is based on the actual power usage of the multiple batteries 200 calculated in real time by the monitoring module 170. When the actual power usage is less than the second threshold, the early warning module 180 alarms the control module 160. The control module 160 controls one or more switch elements 150 to be disconnected according to the alarm information of the early warning module 180, thereby reducing the number of operations of the first DC power supply module 110, ensuring the stable operation of the charging and discharging process, reducing the waste of resources, and reducing unnecessary testing costs.

[0104] The present application also provides a battery testing device. Fig. 9 As shown, the battery testing device 100 may include a plurality of first DC power modules 110, the input ends of the plurality of first DC power modules 110 being connected to a power grid; an electrical connector 120, the electrical connector 120 being connected to the input ends of the plurality of batteries 200, and being connected to the output ends of the plurality of first DC power modules 110, so that the plurality of first DC power modules 110 are connected in parallel with each other; wherein the energy of the discharge batteries in the plurality of batteries 200 flows into the charge batteries in the plurality of batteries 200 through the electrical connector 120.

[0105] It should be understood that the energy of the discharge batteries in the multiple batteries 200 flows into the rechargeable batteries in the multiple batteries through the electrical connector 120, which may refer to that the energy of the discharge batteries in the multiple batteries 200 flows into the rechargeable batteries through the electrical connector 120 for charging the rechargeable batteries, or may refer to that part of the energy of the discharge batteries in the multiple batteries 200 flows into the rechargeable batteries for charging the rechargeable batteries, while the other part of the energy may flow into the first DC power module 110 through the electrical connector 120 and flow into the power grid for recovery. For example, in the case where the total discharge power of the discharge batteries in the multiple batteries 200 is greater than the total charging power of the rechargeable batteries in the multiple batteries 200, the excess energy may flow into the first DC power module 110 through the electrical connector 120 and flow into the power grid for recovery.

[0106] There are often some batteries in the multiple batteries 200 that are being charged while others are being discharged. By connecting the input ends of the multiple batteries 200 to the electrical connector 120, the energy of the discharged batteries in the multiple batteries 200 flows to the electrical connector 120, and then flows to other batteries being charged through the electrical connector 120, so that the energy of the multiple batteries 200 can flow on the electrical connector 120 during the charging and discharging process without first returning to the power grid, and then providing the energy to the battery that needs to be charged after conversion through the first DC power module 110, thereby improving the efficiency of the entire charging and discharging process.

[0107] According to some embodiments of the present application, the present application further provides a battery testing system 10, comprising a battery testing device 100 and a plurality of batteries 200 as described in any of the above schemes, wherein the battery testing device 100 is used to perform charge and discharge tests on the plurality of batteries 200.

[0108] According to some embodiments of the present application, see Figure 6 The present application provides a battery testing device 100, comprising: a plurality of first DC power modules 110, the input ends of the plurality of first DC power modules 110 being connected to a power grid; an electrical connector 120, the electrical connector 120 being connected to the output ends of the plurality of first DC power modules 110, so that the plurality of first DC power modules 110 are connected in parallel with each other; a plurality of second DC power modules 130, the input ends of the plurality of second DC power modules 130 being connected to the electrical connector 120, and the output ends of the plurality of second DC power modules 130 being connected in series with a plurality of batteries 200 in a one-to-one correspondence; wherein the plurality of second DC power modules 130 include a first battery testing module 131 and a second battery testing module 132, and the plurality of second DC power modules 130 are configured such that when the first battery testing module 131 performs a charging test, the second battery testing module 132 performs a discharging test, and the discharge current of the second battery testing module 132 flows to the first battery testing module 131 through the electrical connector 120.

[0109] The first DC power supply module 110 is used to convert a first voltage into a second voltage, and a current flows from an input end of the first DC power supply module 110 to an output end of the first DC power supply module 110; or, the first DC power supply module 110 is used to convert the second voltage into the first voltage, and a current flows from the output end of the first DC power supply module 110 to the input end of the first DC power supply module 110; the first voltage is greater than the second voltage.

[0110] The total power of the multiple first DC power modules 110 is greater than or equal to the actual use power, and the actual use power is the absolute value of the difference between the total charging power of the multiple batteries and the total discharging power of the multiple batteries 200.

[0111] The first battery testing module 131 is used to convert the third voltage into a fourth voltage, and the current flows from the input end of the first battery testing module 131 to the output end of the first battery testing module 131; the second battery testing module 132 is used to convert the fourth voltage into the third voltage, and the current flows from the output end of the second battery testing module 132 to the input end of the second battery testing module 132; the third voltage is greater than the fourth voltage.

[0112] The power of the second DC power module 130 is greater than or equal to the rated power of the battery correspondingly connected to the second DC power module 130 .

[0113] When the total discharge power of the multiple batteries 200 is greater than the total charge power of the multiple batteries, a portion of the discharge current of the second battery test module 132 flows into the power grid through the electrical connector 120 and the first DC power module 110 .

[0114] When the total discharge power of the multiple batteries 200 is less than or equal to the total charging power of the multiple batteries 200, the discharge current of the second battery test module 132 flows to the first battery test module 131 through the electrical connector 120; and / or, the current of the power grid flows to the first battery test module 131 through the multiple first DC power supply modules 110 and the electrical connector 120.

[0115] The material of the electrical connector 120 is copper.

[0116] The battery testing device also includes an AC / DC power supply module 140, the output end of the AC / DC power supply module 140 is connected to the input end of the multiple first DC power supply modules 110, and the input end of the AC / DC power supply module 140 is connected to the power grid; the AC / DC power supply module 140 is used to convert the AC power from the power grid into DC power, and convert the fifth voltage into a sixth voltage; or, the AC / DC power supply module 140 is used to convert the DC power from the first DC power supply module 110 into AC power, and convert the sixth voltage into the fifth voltage; the fifth voltage is less than the sixth voltage.

[0117] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The embodiments described above are merely illustrative. For example, the division of the modules can be a logical function division. There can be other division methods in actual implementation, such as: multiple modules or components can be combined, or can be integrated into another system, or some features can be ignored, or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or modules can be electrical, mechanical or other forms.

[0118] The modules described above as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules; they may be located in one place or distributed on multiple network units; some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0119] In addition, all functional modules in the embodiments of the present application may be integrated into one processing unit, or each module may be a separate unit, or two or more modules may be integrated into one unit; the above-mentioned integrated modules may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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 included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery testing device, characterized in that: include: A plurality of first direct current power supply modules (110), wherein input ends of the plurality of first direct current power supply modules (110) are connected to a power grid; an electrical connector (120), the electrical connector (120) being connected to output ends of the plurality of first DC power modules (110), such that the plurality of first DC power modules (110) are connected in parallel with each other; a plurality of second DC power modules (130), wherein input ends of the plurality of second DC power modules (130) are connected to the electrical connector (120), and output ends of the plurality of second DC power modules (130) are connected in series with a plurality of batteries (200) in a one-to-one correspondence; The plurality of second DC power supply modules (130) include a first battery test module (131) and a second battery test module (132); the plurality of second DC power supply modules (130) are configured such that when the first battery test module (131) performs a charging test, the second battery test module (132) performs a discharging test, and a discharging current of the second battery test module (132) flows to the first battery test module (131) through the electrical connector (120); The total power of the plurality of first DC power modules (110) is greater than or equal to the actual use power, and the actual use power is the absolute value of the difference between the total charging power of the plurality of batteries (200) and the total discharging power of the plurality of batteries (200).

2. The battery testing device according to claim 1, characterized in that: The first DC power module (110) is used to convert the first voltage into a second voltage, and the current flows from the input end of the first DC power module (110) to the output end of the first DC power module (110); or, The first DC power module (110) is used to convert the second voltage into the first voltage, and current flows from an output end of the first DC power module (110) to an input end of the first DC power module (110); The first voltage is greater than the second voltage.

3. The battery testing device according to claim 2, characterized in that: The ratio of the total power of the plurality of first direct current power modules (110) to the total rated power of the plurality of batteries (200) is in the range of [0.3, 0.5].

4. The battery testing device according to claim 2, characterized in that: The first battery test module (131) is used to convert the third voltage into a fourth voltage, and the current flows from the input end of the first battery test module (131) to the output end of the first battery test module (131); The second battery test module (132) is used to convert the fourth voltage into the third voltage, and the current flows from the output end of the second battery test module (132) to the input end of the second battery test module (132); The third voltage is greater than the fourth voltage.

5. The battery testing device according to claim 4, characterized in that: The power of the second DC power module (130) is greater than or equal to the rated power of a battery correspondingly connected to the second DC power module (130).

6. The battery testing device according to claim 5, characterized in that: When the total discharge power of the multiple batteries (200) is greater than the total charge power of the multiple batteries (200), a partial discharge current of the second battery test module (132) flows to the power grid through the electrical connector (120) and the first DC power module (110).

7. The battery testing device according to claim 4, characterized in that: In a case where the total discharge power of the plurality of batteries (200) is less than or equal to the total charge power of the plurality of batteries (200), The discharge current of the second battery test module (132) flows to the first battery test module (131) through the electrical connection member (120); and / or, The current of the power grid flows to the first battery testing module (131) through the plurality of first direct current power supply modules (110) and the electrical connector (120).

8. The battery testing device according to any one of claims 1 to 7, characterized in that: The rated current of the electrical connector (120) is greater than or equal to 600A.

9. The battery testing device according to any one of claims 1 to 7, characterized in that: The material of the electrical connection piece (120) is copper.

10. The battery testing device according to any one of claims 1 to 7, characterized in that: The battery testing device further comprises an AC / DC power supply module (140), the output end of the AC / DC power supply module (140) being connected to the input ends of the plurality of first DC power supply modules (110), and the input end of the AC / DC power supply module (140) being connected to the power grid; The AC / DC power supply module (140) is used to convert AC power from a power grid into DC power, and to convert the fifth voltage into a sixth voltage; or, The AC / DC power supply module (140) is used to convert the DC power from the first DC power supply module (110) into AC power, and to convert the sixth voltage into the fifth voltage; The fifth voltage is lower than the sixth voltage.

11. The battery testing device according to any one of claims 1 to 7, characterized in that: The battery testing device also includes: A plurality of switch elements (150), the plurality of switch elements (150) being connected in series in a one-to-one correspondence with the plurality of first DC power supply modules (110); A control module (160), the control module (160) being used to control the on and off of the plurality of switch elements (150).

12. The battery testing device according to claim 11, characterized in that: The battery testing device also includes: a monitoring module (170), the monitoring module (170) being used to monitor the charging power and discharging power of the plurality of batteries (200), and to calculate actual use power, the actual use power being the absolute value of the difference between the total charging power of the plurality of batteries (200) and the total discharging power of the plurality of batteries (200); An early warning module (180), the early warning module (180) being used to send an alarm to the control module (160) when the actual power usage is greater than or equal to a first threshold; The control module (160) is further used to control one or more of the switch elements (150) to close, so as to increase the number of operating the first DC power supply module (110).

13. The battery testing device according to claim 12, characterized in that: The early warning module (180) is further used to send an alarm to the control module (160) when the actual power usage is less than a second threshold value; The control module (160) is further used to control one or more of the switch elements (150) to be disconnected, so as to reduce the number of operating first DC power supply modules (110).

14. A battery testing system, characterized in that: The invention comprises a plurality of batteries (200) and a battery testing device according to any one of claims 1 to 13, wherein the battery testing device is used for performing charge and discharge tests on the plurality of batteries (200).

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