Battery total voltage detection method, battery total voltage detection system and energy storage system

Abstract

The application provides a battery total voltage detection method, a battery total voltage detection system and an energy storage system. The battery total voltage detection method is applied to a battery total voltage detection system of a stacked energy storage system. The stacked energy storage system comprises N battery modules arranged in a stack. Each battery module is composed of a plurality of battery cells. The battery total voltage detection system is configured to collect battery cell voltage data in the battery module and perform terminal module detection through N information collection units that communicate in a daisy chain mode. The method comprises the following steps: obtaining battery cell voltage data collected by the information collection unit and terminal module detection data generated by the terminal module detection; determining a terminal module detection result based on the terminal module detection data; performing battery total voltage detection of the stacked energy storage system based on the terminal module detection result and the battery cell voltage data to obtain a battery total voltage detection result. The method enables the energy storage system to automatically complete battery total voltage detection, simplifies the detection process and reduces labor costs.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy storage systems, and more particularly to a battery total voltage detection method, a battery total voltage detection system and an energy storage system. BACKGROUND

[0002] Household energy storage (household storage) refers to an energy storage system for household users. The household energy storage system is usually installed in combination with a household photovoltaic system to provide electrical energy for household users. During the day, the electrical energy generated by the photovoltaic system is preferentially used by the local load, and the excess energy is stored in the battery. In the case of excess energy, the energy can be selectively integrated into the power grid. At night, when the photovoltaic system cannot generate electricity, the battery discharges to provide electrical energy for the local load. The household energy storage system can improve the self-generation and self-use degree of the household photovoltaic system, reduce the user's electricity bill, and ensure the stability of the user's electricity in extreme weather conditions. The battery pack of the household energy storage system can have a working voltage of several hundred volts to several thousand volts. A correct battery total voltage acquisition method is a prerequisite for ensuring the safety and normal operation of the system.

[0003] The number of cell strings of each battery module of a stacked household energy storage system is fixed, and the number of modules is determined according to the customer's customization requirements. The number of modules needs to be written by the host computer during system installation, and then the battery total voltage detection of the system can be performed. The battery total voltage detection method of the system is usually as follows: the main control unit reads the voltage of each cell by communicating with the information acquisition unit, then the battery total voltage is obtained by accumulating the voltages of all cells, and the total number of cells can also be determined. Since the number of cells in each module is a known parameter, the number of modules of the system can be calculated based on the total number of cells detected and the number of cells in each module. Comparing the calculated number of modules with the written number of modules, if they are equal, the battery total voltage acquisition is normal, and the battery total voltage is equal to the accumulated battery total voltage; if they are not equal, the total voltage acquisition is abnormal.

[0004] Although the existing detection method can effectively determine whether the battery total voltage is normal, it requires that the host computer device be configured on site, and the on-site personnel also need to have the operation ability and write the correct number of modules before the detection can be performed. The operation of the on-site personnel and the configuration of the on-site device are both required to be high, and the detection process is relatively complicated, which increases the labor cost of after-sales maintenance. SUMMARY

[0005] The present application is proposed considering the above problems. The present application provides a battery total voltage detection method, a battery total voltage detection system and an energy storage system, which can automatically complete the battery total voltage detection through the detection terminal battery module, thereby simplifying the detection process and reducing the labor cost.

[0006] According to an aspect of the present application, a battery total voltage detection method is provided, which is applied to a battery total voltage detection system of a stacked energy storage system, the stacked energy storage system comprising N battery modules arranged in a stack, each battery module comprising a plurality of battery cells, the battery total voltage detection system being configured to collect battery cell voltage data in the battery modules and perform terminal module detection through N information collection units in daisy chain communication, the method comprising:

[0007] obtaining battery cell voltage data collected by the information collection units or terminal module detection data generated by terminal module detection;

[0008] determining a terminal module detection result based on the terminal module detection data;

[0009] performing battery total voltage detection of the stacked energy storage system based on the terminal module detection result and the battery cell voltage data to obtain a battery total voltage detection result.

[0010] In an embodiment of the present application, the terminal module detection result comprises a detected terminal battery module and an undetected terminal battery module, and performing battery total voltage detection of the stacked energy storage system based on the terminal module detection result and the battery cell voltage data comprises:

[0011] when the terminal module detection result is a detected terminal battery module, determining that the battery total voltage collection state is normal and satisfies a preset working condition;

[0012] when the terminal module detection result is an undetected terminal battery module, determining that the battery total voltage collection state is abnormal and does not satisfy the preset working condition.

[0013] In an embodiment of the present application, when the terminal module detection result is a detected terminal battery module, performing battery total voltage detection of the stacked energy storage system based on the terminal module detection result and the battery cell voltage data further comprises:

[0014] generating a battery total voltage based on the battery cell voltage data and a preset battery cell connection relationship.

[0015] In an embodiment of the present application, the battery total voltage detection system is further configured to collect the number of battery cell detections of each battery module, and the method further comprises:

[0016] when the terminal module detection result is a detected terminal battery module, obtaining the number of module detections of the stacked energy storage system based on the number of battery cell detections of each battery module and a preset number of module battery cells;

[0017] taking the number of module detections as the number of module configurations of the stacked energy storage system.

[0018] In one embodiment of the present application, the module detection number of the stacked energy storage system is obtained based on the cell detection number of each battery module and the preset module cell configuration number, comprising:

[0019] The total cell detection number of the stacked energy storage system is obtained based on the cell detection number of each battery module;

[0020] The module detection number of the stacked energy storage system is obtained based on the total cell detection number and the module cell configuration number.

[0021] According to the second aspect of the present application, a battery total pressure detection system is provided, which is applied to a stacked energy storage system comprising N battery modules, the battery total pressure detection system comprising a master control unit, N information acquisition units corresponding to the N battery modules in the stacked energy storage system, and the N information acquisition units being connected in series with the master control unit in a daisy chain communication mode;

[0022] The information acquisition unit is provided with a terminal module detection circuit, and is used to acquire the cell voltage data of each cell in the battery module connected thereto and perform terminal module detection through the terminal module detection circuit to obtain terminal module detection data, and send the cell voltage data and the terminal module detection data to the master control unit;

[0023] The master control unit is used to determine a terminal module detection result based on the terminal module detection data, and perform battery total pressure detection of the stacked energy storage system based on the terminal module detection result and the cell voltage data.

[0024] In one embodiment of the present application, the stacked energy storage system further comprises a connector provided between adjacent two battery modules, the battery modules and the information acquisition units are connected in series through the connector, the connector is provided with a position identification element for identifying the position of the connector, and the position identification element is connected with the information acquisition unit one by one.

[0025] In one embodiment of the present application, the terminal module detection circuit comprises a first connection terminal, a second connection terminal, a first resistor, a second resistor and a detection terminal.

[0026] The first resistor is connected with the power supply in the information acquisition unit and the first connection terminal, respectively;

[0027] The second resistor is connected with a reference ground and the second connection terminal, respectively;

[0028] The detection terminal is connected with the first connection terminal or the second connection terminal.

[0029] In one embodiment of the present application, the position identification element arranged on the connector connected with the Nth battery module as the terminal battery module is a short-circuiting device, and no position identification element is arranged on the connector connected with the 1st to (N-1)th battery modules.

[0030] In one embodiment of the present application, the terminal module detection result includes detection of the terminal battery module or no detection of the terminal battery module; and the master control unit is configured to:

[0031] When the terminal module detection result is detection of the terminal battery module, it is determined that the battery total voltage acquisition state is normal and meets the preset working condition;

[0032] When the terminal module detection result is no detection of the terminal battery module, it is determined that the battery total voltage acquisition state is abnormal and does not meet the preset working condition.

[0033] In one embodiment of the present application, when the terminal module detection result is detection of the terminal battery module, the master control unit is further configured to:

[0034] generate the battery total voltage based on the cell voltage data and the preset cell connection relationship.

[0035] In one embodiment of the present application, the information acquisition unit is further configured to acquire the number of detected cells of each cell in the battery module connected therewith, and send the number of detected cells to the master control unit.

[0036] In one embodiment of the present application, the terminal module detection result includes detection of the terminal battery module and no detection of the terminal battery module; and the master control unit is further configured to:

[0037] When the terminal module detection result is detection of the terminal battery module, obtain the number of detected modules of the stacked energy storage system based on the number of detected cells sent by each information acquisition unit and the preset number of module cells;

[0038] use the number of detected modules as the number of module configurations of the stacked energy storage system.

[0039] According to a third aspect of the present application, a battery total voltage detection device is provided, which includes a memory and a processor, the memory stores a computer program run by the processor, and the computer program, when run by the processor, causes the processor to execute the battery total voltage detection method according to any one of the first aspect.

[0040] According to a fourth aspect of the present application, a storage medium is provided, and the storage medium stores a computer program, which, when executed, performs the battery total pressure detection method according to any one of the first aspect.

[0041] According to a fifth aspect of the present application, a stacked energy storage system is provided, and the system comprises M battery modules and the battery total pressure detection system according to any one of the second aspect.

[0042] The battery total pressure detection state is determined by the detection data of the terminal module, so that the household energy storage system can automatically complete the battery total pressure detection without human intervention, simplifying the detection process and reducing labor costs. BRIEF DESCRIPTION OF DRAWINGS

[0043] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description of embodiments of the present application taken in conjunction with the accompanying drawings. The drawings provided in the specification and the embodiments of the present application are only for further illustrating the present application and are not intended to limit the scope of the present application. In the drawings, the same reference numerals are generally used to represent similar or like parts throughout the views and the embodiments of the present application are not limited to the drawings.

[0044] Figure 1 is a schematic block diagram of an electronic device for implementing the battery total pressure detection method and device according to an embodiment of the present application;

[0045] Figure 2 is a schematic flowchart of the battery total pressure detection method according to an embodiment of the present application;

[0046] Figure 3 is a schematic flowchart of the battery total pressure detection method according to the first embodiment of the present application;

[0047] Figure 4 is a schematic block diagram of the battery total pressure detection system according to an embodiment of the present application;

[0048] Figure 5 is a circuit diagram of the terminal module detection circuit according to an embodiment of the present application;

[0049] Figure 6 is a schematic block diagram of the battery total pressure detection system according to the second embodiment of the present application, in which the position identification element is a short circuit. DETAILED DESCRIPTION

[0050] In order to make the objects, technical solutions and advantages of the present application more obvious, the following will describe the example embodiments according to the present application in detail with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application described in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the protection scope of the present application.

[0051] Stacked technology is widely used in various energy storage systems due to its simple and fast installation, elegant appearance, and solid and reliable structure. The number of modules of the stacked household energy storage varies according to the terminal demand, and the number of modules can be increased or decreased arbitrarily. The use of stacked technology can well adapt to this demand. Since the existing stacked household energy storage system needs to write the number of modules through the host computer operation before detecting the total pressure of the battery, and then the total pressure of the battery can be detected, the detection process is relatively cumbersome. Therefore, the present application provides a battery total pressure detection method, a battery total pressure detection system and an energy storage system, which can effectively simplify the detection steps of the total pressure of the battery.

[0052] First, referring to Figure 1 The example electronic device 100 for implementing the battery total pressure detection method and device of the embodiments of the present application is described.

[0053] As shown in Figure 1 The electronic device 100 includes a processor 110, a memory 120, and a communication interface 130. Among them, the memory 120, the processor 110 and the communication interface 130 can communicate through the communication bus 140.

[0054] Optionally, the communication interface 130 can also include a transmitter and / or a receiver.

[0055] The processor 110 can be a microcontroller unit (MCU), a central processing unit (CPU), a digital signal processor (DSP), a single-chip microcomputer, and an embedded device or other forms of processing units with data processing capability and / or instruction execution capability, and can control other components in the autonomous driving vehicle system to perform desired functions.

[0056] The memory 120 can be various forms of computer readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may, for example, include random access memory (RAM), cache, synchronous dynamic random access memory (SDRAM), and the like. The non-volatile memory may, for example, include read only memory (ROM), hard disk, flash memory (Flash), and the like. One or more computer program instructions can also be stored on the computer readable storage medium, and the memory 120 can run the program instructions to implement the fault smooth switching method in the embodiments of the application described below.

[0057] The battery total voltage detection method provided by the application can be applied to a battery total voltage detection system of a stacked energy storage system. The stacked energy storage system includes N battery modules arranged in a stack, N is a positive integer greater than or equal to 1, each battery module is composed of a plurality of battery cells, and the battery total voltage detection system is configured to collect battery cell voltage data in the battery module and perform terminal module detection through N information collection units in daisy chain communication.

[0058] Exemplarily, the battery total voltage detection system can include a master control unit and N information collection units, and the method of the application can be applied to the master control unit.

[0059] Specifically, the N information collection units are sequentially connected in series in communication to form a daisy chain, and the N information collection units correspond one-to-one to the N battery modules, wherein two adjacent information collection units communicate bidirectionally, the master control unit is connected to the information collection unit at the starting end of the daisy chain for bidirectional communication. The information collection unit farthest from the master control unit on the daisy chain is a terminal information collection unit, and the terminal battery module refers to the battery module corresponding to the terminal information collection unit on the daisy chain among the N battery modules.

[0060] Next, the battery total voltage detection method according to the embodiments of the application will be described with reference to Figure 2

[0061] As shown in Figure 2 The battery total voltage detection method provided by the application includes:

[0062] In step S210, the battery cell voltage data collected by the information collection unit and the terminal module detection data generated by the terminal module detection are obtained.

[0063] Here, the battery cell voltage data can refer to the voltage data of each battery cell in the battery module corresponding to the information collection unit, and the terminal module detection data can refer to the data obtained after the information collection unit performs terminal module detection on the battery module connected thereto.​

[0064] In the present application, various methods can be used for terminal module detection. For example, different specifications of position identification elements can be arranged on the battery module, and the terminal module and non-terminal module can be distinguished by the position identification elements. The terminal module is determined by detecting the position identification elements. Correspondingly, the terminal module detection data can be current data or voltage data obtained by detecting the position identification elements. The terminal module detection method can be flexibly set by those skilled in the art according to actual needs, and the present application does not make specific limitations.

[0065] In step S220, the terminal module detection result is determined based on the terminal module detection data.

[0066] For example, when the terminal battery module is determined by detecting the position identification elements arranged on the battery module, if the position identification element arranged on the terminal battery module is detected, it indicates that the terminal battery module is detected, and the terminal module detection result is that the terminal battery module is detected. If the position identification element arranged on the terminal battery module is not detected, it indicates that the terminal battery module is not detected, and the terminal module detection result is that the terminal battery module is not detected.

[0067] In step S230, the battery total pressure detection of the stacked energy storage system is performed based on the terminal module detection result and the cell voltage data, and a battery total pressure detection result is obtained.

[0068] Since the N information acquisition units communicate in a daisy chain mode, that is, the entire communication link is in a series mode, any node failure on the daisy chain will cause the communication of the node to be interrupted, and will cause the information acquisition unit corresponding to the fault node to the terminal battery module to be unable to communicate with the master control unit, and the master control unit cannot read the cell voltage data. At this time, the cumulative all readable cell voltages are not equal to the battery total pressure. If the first to the last information acquisition units can normally communicate, at this time, the cumulative all readable cell voltages are equal to the battery total pressure. Therefore, whether the terminal battery module is detected can be used to detect whether all the information acquisition units on the entire communication link are running and communicating normally, and further to detect whether the battery total pressure acquisition is normal.

[0069] In the embodiments of the present application, the battery total pressure acquisition state is judged by the detection data of the terminal module, so that the household energy storage system can automatically complete the battery total pressure detection without human intervention, simplifying the detection process and reducing labor costs.

[0070] According to an embodiment of the present application, based on the terminal module detection result and the cell voltage data, the battery total pressure detection of the stacked energy storage system is performed, comprising:

[0071] When the terminal module detection result is detection of a terminal battery module, it is determined that the battery total voltage acquisition state is normal and meets the preset working condition.

[0072] When the terminal module detection result is no detection of a terminal battery module, it is determined that the battery total voltage acquisition state is abnormal and does not meet the preset working condition.

[0073] Specifically, when the terminal module detection result is detection of a terminal battery module, it can be determined that the running states of each information acquisition unit on the daisy chain communication link are normal, and it is further determined that the battery total voltage acquisition state is normal; when the terminal module detection result is no detection of a terminal battery module, it can be determined that one or more information acquisition units on the daisy chain communication link are faulty, and it is further determined that the battery total voltage acquisition state is abnormal.

[0074] Further, in an embodiment of the present application, the battery total voltage detection system is further used to acquire the number of cell detections of each battery module, and the method further comprises:

[0075] When the terminal module detection result is detection of a terminal battery module, the number of module detections of the stacked energy storage system is obtained based on the number of cell detections of each battery module and the preset number of module cell configurations;

[0076] The number of module detections is taken as the number of module configurations of the stacked energy storage system.

[0077] Here, the preset number of module cell configurations and the number of module configurations are configuration data required before system operation, and the preset number of module cell configurations is determined when the battery module is shipped, so the configuration is completed before the system is shipped and stored in the system. The number of module configurations is N, and the number of module configurations is determined according to the actual demand of the user, so the number of module configurations cannot be determined when the stacked energy storage system is shipped. Therefore, the number of module configurations needs to be configured when the equipment is installed.

[0078] In the serial communication system, as long as the terminal module can be recognized, it means that all information acquisition units communicate normally, and it means that each module has been connected to the system. At this time, by acquiring all cell numbers, and dividing the number of cells of each module, the real number of module configurations of the system can be obtained. At this time, all cell voltages are acquired to accumulate and calculate the battery total voltage as the real total voltage of the energy storage system.

[0079] In the embodiment, the specific method for obtaining the number of module detections of the stacked energy storage system based on the number of cell detections of each battery module and the preset number of module cell configurations comprises:

[0080] Based on the number of cell detections of each battery module, the total number of cell detections M of the stacked energy storage system is accumulated according to formula (1).

[0081] M = m1 + m2 + … + m N (1)

[0082] Wherein, m1, m2…m N are the number of battery cell detections of the 1st-Nth battery module.

[0083] Next, based on the total number of battery cell detections and the number of module battery cell configurations, the number of module detections of the stacked energy storage system is calculated according to formula (2):

[0084] BatteryModule_n = M / Qn (2)

[0085] Wherein, Qn is the number of module battery cell configurations.

[0086] Since the number of battery cells of each battery module of the stacked energy storage system is the same, and this data already exists in the system, it can be directly obtained. Therefore, the ratio of the total number of battery cell detections and the number of module battery cell configurations is the number of module detections of the stacked energy storage system.

[0087] When the terminal module detection result is that the terminal battery module is detected, it can be determined that each information acquisition unit is operating normally, so the number of module detections can be used as the number of module configurations of the stacked energy storage system, and directly saved in the system, thereby avoiding the problem that the system cannot work due to the battery total pressure fault caused by the inconsistency between the actual number of module used by the energy storage system and the default number of module of the master control unit; At the same time, it also avoids the problem of personnel operation error caused by the inconsistent operation level of personnel on site, improves the brand image of the product, and reduces the maintenance cost after sale.

[0088] Next, the battery total pressure detection method according to the first embodiment of the present application will be described with reference to Figure 3 .

[0089] Figure 3 is a schematic flowchart of the battery total pressure detection method according to the first embodiment of the present application, as Figure 3 shown, the method of the present embodiment is applied in the stacked household energy storage system, and the battery total pressure detection method of the present embodiment includes:

[0090] In step S310, the master control unit issues a broadcast command to each information acquisition unit through cascading communication, and the broadcast command includes a battery cell voltage acquisition command and a terminal module detection command.

[0091] In step S320, after receiving the broadcast command, each information collection unit collects the cell voltage data and performs terminal module detection, and returns the cell voltage data and terminal module detection data. Specifically, in the embodiment, the position identification element of the battery module is a resistor, the resistor for identifying the terminal battery module is R2, and the resistor for identifying other battery modules is R1. The information collection unit determines whether it is the terminal battery module by collecting the voltage across the resistor.

[0092] Exemplarily, the voltage value across R2 is En_Check2, and the voltage value across R1 is En_Check1.

[0093] In step S330, the main control unit receives and saves the cell voltage data and terminal module detection data sent by each information collection unit.

[0094] In step S340, it is judged whether the terminal module detection data exists En_Check2.

[0095] The terminal module detection result is obtained by judging the terminal module detection data.

[0096] Specifically, the main control unit checks the terminal module detection data of each information collection unit. When it is detected that one result is En_Check2, it can be recognized that the module of the information collection unit is the terminal module of the system. When it is detected that all results are En_Check1, the information collection unit has a fault, and an abnormal fault of total voltage is reported. At this time, the cause of the fault needs to be further investigated.

[0097] In step S350, when it is detected that one result is En_Check2, the main control unit can calculate the module detection number BatteryModule_n of the system according to formula (2), and the main control unit can automatically write the system module configuration number Wn=BatteryModule_n.

[0098] In step S360, the main control unit counts the voltage collection data returned by each information collection unit, and calculates the cumulative voltage V according to the following formula (3). SUM :

[0099] V SUM =V C1 +V C2 +......+V CM (3)

[0100] Wherein, V C1 , V C2 ……V CM are the cell voltages of the 1st-Mth cells.

[0101] The final battery total voltage VBUS equal to V SUM .

[0102] It should be noted that the above formula (3) is determined based on the series connection relationship of the battery cell, and the battery cell is connected in series in the embodiment, so the total voltage of the battery is equal to the sum of the voltages of each battery cell. When the battery cell adopts other connection relationship, the calculation formula of the total voltage of the battery cell needs to be determined according to the connection relationship, and the connection relationship of the battery cell and the calculation method of the total voltage of the battery are not limited in the embodiment.

[0103] In step S370, it is determined that the total voltage of the battery is collected normally, and the normal working condition is met.

[0104] Through the total voltage detection method of the battery, the number of the battery modules can be automatically and effectively identified, the problem of personnel error operation can be completely avoided, the product quality and image can be improved, and the after-sales maintenance cost can be reduced.

[0105] The application also provides a total voltage detection system of a battery, which is applied to a stacked energy storage system, and the stacked energy storage system includes N battery modules.

[0106] Next, the total voltage detection system of the battery according to the embodiment of the application is described with reference to Figure 4 .

[0107] As shown in Figure 4 , the total voltage detection system 400 of the battery provided by the application includes a master control unit 410, N information acquisition units 420 corresponding to the N battery modules in the stacked energy storage system in one-to-one manner, and the N information acquisition units 420 are connected to the master control unit 410 in a daisy chain communication mode after being connected in series;

[0108] The information acquisition unit 420 is provided with a terminal module detection circuit 421, and the information acquisition unit 420 is used to acquire the battery cell voltage data of each battery cell in the battery module connected thereto and perform terminal module detection through the terminal module detection circuit 421 to obtain terminal module detection data, and send the battery cell voltage data and the terminal module detection data to the master control unit 410;

[0109] The master control unit 410 is used to determine the terminal module detection result based on the terminal module detection data, and perform total voltage detection of the battery of the stacked energy storage system based on the terminal module detection result and the battery cell voltage data.

[0110] Specifically, the master unit 410 can adopt a microcontroller unit (MCU), a central processing unit (CPU), a digital signal processor (DSP), a single-chip microcomputer, and an embedded device, or other forms of processing units with data processing capability and / or instruction execution capability.

[0111] Specifically, the information acquisition unit 420 can adopt a circuit unit with an analog signal sampling function, which can be an integrated circuit unit or a discrete circuit unit. The terminal module detection circuit is used to detect the terminal module, and can also be an integrated circuit or a discrete circuit.

[0112] The information acquisition unit 420 can convert the collected analog signal into a digital signal, and send it to the active unit 410 in the form of a differential isolated signal after preprocessing.

[0113] Since the stacked energy storage system usually includes an energy management system, which includes an analog front-end for collecting battery module voltage and temperature and a master control unit for energy management, the battery total voltage detection system in the embodiment of the application can be separately provided or uniformly provided with the existing energy management system.

[0114] Preferably, the battery total voltage detection system is uniformly provided with the existing energy management system, and a terminal module detection circuit is added in the existing analog front-end, and the function of the master control unit 410 is realized through the master control unit of the energy management system.

[0115] By using the battery total voltage detection system in the embodiment of the application to detect the terminal module, the battery total voltage acquisition state is judged, so that the energy storage system can automatically complete the battery total voltage detection without human intervention, simplifying the detection process and reducing labor costs.

[0116] According to an embodiment of the application, the stacked energy storage system further comprises a connector arranged between two adjacent battery modules and used to realize the series connection of the battery modules and the information acquisition unit, the connector is provided with a position identification element used to identify the position of the connector, and the position identification element is connected with the information acquisition unit one by one.

[0117] Specifically, the connector has two groups of connection terminals, and the two groups of connection terminals are connected by power lines or signal lines. Each group of connection terminals includes at least: a battery module positive electrode (B+) connection terminal, a battery module negative electrode (B-) connection terminal, a daisy chain first connection terminal, a daisy chain second connection terminal, a position identification first connection terminal (FN), and a position identification second connection terminal (FP). The battery module positive electrode connection terminal and the battery module negative electrode connection terminal are respectively connected to two B+ and B- power lines of the battery module, and the daisy chain first connection terminal and the daisy chain second connection terminal are respectively connected to two daisy chain communication lines. The position identification first connection terminal and the position identification second connection terminal are used to connect a position identification element.

[0118] Through the connector, the information acquisition unit can be connected in communication with an adjacent information acquisition unit, and the battery module can be connected in series with an adjacent battery module.

[0119] In the embodiment, the position identification element is used to identify the position of the battery module, so as to realize detection of the terminal battery module. Therefore, the terminal battery module can be provided with a position identification element of a different specification from other battery modules. Exemplarily, the position identification element can be a resistor, a capacitor, an inductor, a short-circuiting element, etc. Since the information acquisition unit can acquire an analog signal, the terminal module detection circuit can be affected by the position identification element to affect the current or voltage in the circuit, and then the position of the module is detected.

[0120] Next, a terminal module detection circuit according to an embodiment of the application will be described with reference to Figure 5

[0121] According to an embodiment of the application, the terminal module detection circuit can adopt a resistance voltage division circuit, as shown in Figure 5 The terminal module detection circuit specifically includes: a first connection terminal a1, a second connection terminal a2, a first resistor R1, a second resistor R2, and a detection terminal En Check. The first resistor R1 is respectively connected to a power supply VCC in the information acquisition unit and the first connection terminal a1. The second resistor R2 is respectively connected to a reference ground GND and the second connection terminal a2. The detection terminal En Check can be connected to the first connection terminal a1 or the second connection terminal a2.

[0122] In a specific implementation, two wire harnesses can be added to the connector from the information acquisition unit to the battery module, for connecting the information acquisition module port to the battery module connector port. The first connection terminal a1 can be connected to the position identification first connection terminal FN on the connector through the first wire harness, and the second connection terminal a2 can be connected to the position identification second connection terminal FP on the connector through the second wire harness. The terminal module is detected by detecting the voltage of the detection terminal. ​

[0123] By using the terminal module detection circuit in the form of a resistance voltage dividing circuit, the circuit structure is simple, and the detection of the terminal module can be realized by adding corresponding circuits and wiring harnesses in the existing information acquisition unit, and the cost of the added equipment is low.

[0124] Correspondingly, when the terminal module detection circuit adopts a resistance voltage dividing circuit, the position identification element can be a resistor or a short-circuiting element. Preferably, the position identification element arranged on the connector connected with the terminal battery module is a short-circuiting element, and no position identification element is arranged on the connector connected with other battery modules.

[0125] Next, the battery total voltage detection system according to the second embodiment of the present application will be described below with reference to Figure 6 FIG. 2.

[0126] As shown in FIG. 2, the stacked household energy storage battery system includes n battery modules, and a base placed at the bottom for supporting the placed battery modules and a master control unit. The battery module 1 is close to the master control unit, and the last battery module n is close to the base. The master control unit and the battery modules, and the battery modules and the battery modules are connected through connectors. The battery modules and the connectors are connected through power lines, and the information acquisition units and the master control unit are connected through daisy chain communication lines and terminal module detection lines. Figure 6 The battery total voltage detection system of the embodiment includes one master control unit and multiple information acquisition units 1-n, which belongs to a master-slave architecture. The master control unit and the information acquisition units are connected through daisy chain communication, and each information acquisition unit is also connected through daisy chain communication. As shown in FIG. 2, a terminal module detection circuit is arranged in each information acquisition unit, and a short-circuiting element is arranged in the base.

[0127] Figure 5 Therefore, the information acquisition unit at the end of the base can detect the short-circuiting element, so as to determine the number of modules of the system. This method realizes automatic identification and configuration of the number of modules of the system, and the added circuit is simple and has low cost, which can not only reduce the cost of personnel and equipment, but also completely avoid the problem of personnel changing the number of modules.

[0128] When the battery module is not at the end position, the first connection terminal and the second connection terminal are open, and at this time, the voltage detection result En Check1 of the detection terminal is 0 volt; when the battery module is at the end position, the first connection terminal and the second connection terminal have a short-circuiting element, and at this time, the voltage detection result En Check2 of the detection terminal can be calculated according to formula (4):

[0129] En Check2 = VCC * R2 / (R1 + R2)

[0130] ​Wherein, VCC is the power voltage value in the information acquisition unit, R1 is the resistance value of the first resistor, and R2 is the resistance value of the second resistor.

[0131] Since R1, R2 and VCC are all known setting parameters, the terminal module detection result of the information acquisition unit can be used to determine whether the module is a terminal module.

[0132] According to an embodiment of the present application, the terminal module detection result can include detecting a terminal battery module or not detecting a terminal battery module; and then:

[0133] When the terminal module detection result is detecting a terminal battery module, the master control unit is configured to determine that the battery total voltage acquisition state is normal and meets the preset working condition.

[0134] When the terminal module detection result is not detecting a terminal battery module, the master control unit is configured to determine that the battery total voltage acquisition state is abnormal and does not meet the preset working condition.

[0135] According to an embodiment of the present application, when the terminal module detection result is detecting a terminal battery module, the master control unit is further configured to:

[0136] Generate the battery total voltage based on the cell voltage data and the preset cell connection relationship.

[0137] According to an embodiment of the present application, the information acquisition unit is further configured to acquire the cell detection number of each cell in the battery module connected thereto and send the cell detection number to the master control unit.

[0138] According to an embodiment of the present application, the terminal module detection result includes detecting a terminal battery module and not detecting a terminal battery module; and then,

[0139] The master control unit is further configured to, when the terminal module detection result is detecting a terminal battery module, obtain the module detection number of the stacked energy storage system based on the cell detection number sent by each information acquisition unit and the preset module cell configuration number.

[0140] Use the module detection number as the module configuration number of the stacked energy storage system.

[0141] Since the battery total voltage detection method of the present application can be applied to the master control unit of the battery total voltage detection system, the specific implementation process of the master control unit in the above embodiments can refer to the related description of the embodiments of the battery total voltage detection method, which will not be described here.

[0142] The embodiment of the present application further provides a battery total voltage detection device, the device comprises a memory and a processor, the memory has a computer program which is run by the processor, the computer program enables the processor to execute the battery total voltage detection method of any one of the above embodiments when being run by the processor.

[0143] The embodiment of the present application further provides a storage medium, the storage medium has a computer program, the computer program executes the battery total voltage detection method of any one of the above embodiments when being run.

[0144] The embodiment of the present application further provides a stacked energy storage system, the system comprises M battery modules and the battery total voltage detection system of any one of the above embodiments. Wherein, M is a positive integer greater than or equal to 1.

[0145] Although the example embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the example embodiments are merely exemplary and are not intended to limit the scope of the present application. Those of ordinary skill in the art can make various changes and modifications without departing from the scope and spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as claimed in the appended claims.

[0146] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in connection with the embodiments disclosed herein can be realized by electronic hardware, or a combination of computer software and electronic hardware. Whether the functions are performed by hardware or software depends on the specific application and design constraints of the technical solution. Those of ordinary skill in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0147] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed.

[0148] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present application can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not described in detail in order not to obscure the understanding of the present specification.

[0149] Similarly, it is to be understood that the embodiments of the present application can be alternately grouped together in a single embodiment, figure, or description of embodiments for the purpose of brevity and understanding in the interest of conciseness and didacticism. However, this method of grouping the embodiments of the present application is not to be interpreted as reflecting a desire to claim more than is explicitly claimed in each of the claims. Rather, the inventive point is that the respective technical problem can be solved with less than all the features of a certain disclosed single embodiment, as reflected in the respective claims. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, wherein each claim is a separate embodiment of the present application.

[0150] Those skilled in the art will appreciate that all features described herein (including all accompanying claims, abstract and drawings), and steps or elements of any method or process so described, can be combined in any combination, save for features that are mutually exclusive. Each feature or step of the methods described herein can also be replaced by an alternative feature serving the same, equivalent or a similar purpose, unless any such features are expressly stated as being essential to the correct functioning of the application.

[0151] Furthermore, those skilled in the art will recognize that references to conventional functionality of a skilled in the art and references to conventional methodology for analysis and / or detection are meant to be illustrative only and that modifications to and substitutions of such methods and functionality can be made without departing from the scope of the present application. Moreover, those skilled in the art will appreciate that the features of the different embodiments can be combined in any combination, save for mutually exclusive combinations.

[0152] Embodiments of the various components of the present application can be implemented in hardware, or as software modules running in one or more processors, or combinations thereof. Those skilled in the art will appreciate that microprocessors or digital signal processors (DSPs) can be used in practice to implement some or all of the functionality of some of the modules of the item analysis apparatus according to embodiments of the present application. The present application can also be implemented as a program (e.g., computer program and computer program product) for executing any or all of the steps of the methods described herein on a computer system. Such program(s) can be stored on a computer readable medium which can be any medium, or combination of media, used to store information for access by a computer. Such a medium can be available on the Internet, or can be provided on a carrier signal, or in any other form.

[0153] It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word 'comprising' does not exclude the presence of elements or steps other than those listed in a claim. The word 'a' or 'an' preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of both hardware and software, and any combination thereof. In a unitary claim, several devices or sub-claims can be joined by means of the expression 'and / or'. The use of the term 'at least' followed by a list of one or more items should be interpreted as including at least one of the items but it does not exclude the presence of others not specified in the list. The use of the term 'one' or 'the' in relation to an element or step of the application should not be construed as excluding the presence of additional such elements or steps nor should the use of the term 'first','second' and 'third' etc. mean that the elements so designated need to be in a given order and / or locations.

[0154] The above description is only specific embodiments or specific implementations of the present application, and the protection scope of the present application is not limited thereto. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, and all of them should be covered within the protection scope of the present application. The protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of detecting total pressure of a battery, characterized by, The method is applied to a battery total voltage detection system of a stacked energy storage system, the stacked energy storage system comprising N battery modules arranged in a stack, each battery module comprising a plurality of battery cells, the battery total voltage detection system being configured to collect battery cell voltage data in the battery modules and perform terminal module detection through N information collection units in daisy chain communication, the method comprising: obtaining battery cell voltage data collected by the information collection units and terminal module detection data generated by terminal module detection; determining a terminal module detection result based on the terminal module detection data; performing battery total voltage detection of the stacked energy storage system based on the terminal module detection result and the battery cell voltage data to obtain a battery total voltage detection result; wherein the information collection unit farthest from the master control unit on the daisy chain is a terminal information collection unit, and the terminal module detection data is data obtained by the terminal information collection unit after performing terminal module detection on the battery module connected thereto.

2. The battery total pressure detection method according to claim 1, wherein The terminal module detection result includes detecting a terminal battery module or not detecting a terminal battery module, and performing battery total voltage detection of the stacked energy storage system based on the terminal module detection result and the battery cell voltage data comprises: when the terminal module detection result is detecting a terminal battery module, determining that the battery total voltage collection state is normal and satisfies a preset working condition; when the terminal module detection result is not detecting a terminal battery module, determining that the battery total voltage collection state is abnormal and does not satisfy the preset working condition.

3. The battery total pressure detection method according to claim 2, wherein When the terminal module detection result is detecting a terminal battery module, performing battery total voltage detection of the stacked energy storage system based on the terminal module detection result and the battery cell voltage data further comprises: generating a battery total voltage based on the battery cell voltage data and a preset battery cell connection relationship.

4. The battery total pressure detection method of claim 2, wherein The battery total voltage detection system is also used to collect the number of battery cell detections of each battery module, and the method further comprises: when the terminal module detection result is detecting a terminal battery module, obtaining the number of module detections of the stacked energy storage system based on the number of battery cell detections of each battery module and a preset number of module battery cells; using the number of module detections as the number of module configurations of the stacked energy storage system.

5. The battery total pressure detection method of claim 4, wherein Obtaining the number of module detections of the stacked energy storage system based on the number of battery cell detections of each battery module and a preset number of module battery cells comprises: obtaining a total number of battery cell detections of the stacked energy storage system based on the number of battery cell detections of each battery module; obtaining the number of module detections of the stacked energy storage system based on the total number of battery cell detections and the number of module battery cells. 6.A battery total pressure detection system applied to a stacked energy storage system comprising N battery modules, characterized in that, The battery total voltage detection system comprises a master control unit, N information collection units corresponding one-to-one to N battery modules in the stacked energy storage system, and N information collection units connected in series to the master control unit in daisy chain communication. The information collection unit is provided with a terminal module detection circuit, and is configured to collect cell voltage data of each cell in a battery module connected to the information collection unit, and perform terminal module detection on the battery module connected to the information collection unit through the terminal module detection circuit to obtain terminal module detection data, and send the cell voltage data and the terminal module detection data to the master control unit; The master control unit is configured to determine a terminal module detection result based on the terminal module detection data; perform total pressure detection of the battery of the stacked energy storage system based on the terminal module detection result and the cell voltage data, The terminal information collection unit is the information collection unit farthest from the master control unit on the daisy chain, and the terminal module detection data is data obtained by performing terminal module detection on the battery module connected to the terminal information collection unit.

7. The battery total pressure detection system of claim 6, wherein The stacked energy storage system further comprises a connector arranged between two adjacent battery modules, and the battery modules and the information collection units are connected in series through the connector, and the connector is provided with a position identification element for identifying the position of the connector, and the position identification element is connected to the information collection unit one by one.

8. The battery total pressure detection system of claim 6, wherein, The terminal module detection circuit comprises a first connection terminal, a second connection terminal, a first resistor, a second resistor and a detection terminal. The first resistor is connected to the power supply in the information collection unit and the first connection terminal respectively. The second resistor is connected to the reference ground and the second connection terminal respectively. The detection terminal is connected to the first connection terminal or the second connection terminal.

9. The battery total pressure detection system of claim 8, wherein, The position identification element arranged on the connector connected to the Nth battery module as the terminal battery module is a short circuit, and no position identification element is arranged on the connector connected to the 1st to N-1th battery modules.

10. The battery total pressure detection system of claim 6, wherein, The terminal module detection result includes detecting a terminal battery module or not detecting a terminal battery module; and the master control unit is configured to: When the terminal module detection result is detecting a terminal battery module, it is determined that the battery total pressure collection state is normal and meets the preset working condition; When the terminal module detection result is not detecting a terminal battery module, it is determined that the battery total pressure collection state is abnormal and does not meet the preset working condition.

11. The battery total pressure detection system of claim 10, wherein, When the terminal module detection result is detecting a terminal battery module, the master control unit is further configured to: generate the total pressure of the battery based on the cell voltage data and a preset cell connection relationship.

12. The battery total pressure detection system of claim 6, wherein, The information collection unit is further configured to collect the number of cell detections of each cell in the battery module connected to the information collection unit, and send the number of cell detections to the master control unit.

13. The battery total pressure detection system of claim 12, wherein, The terminal module detection result includes detecting a terminal battery module and not detecting a terminal battery module; and the master control unit is further configured to: When the terminal module detection result is detecting a terminal battery module, the number of module detections of the stacked energy storage system is obtained based on the number of cell detections sent by each information collection unit and a preset number of module cells; The number of module detections is used as the number of module configurations of the stacked energy storage system.

14. A battery total pressure detecting apparatus characterized by comprising: The device comprises a memory and a processor, the memory has a computer program run by the processor stored thereon, and the computer program, when being run by the processor, causes the processor to perform the battery total pressure detection method according to any one of claims 1-5.

15. A storage medium, characterized by The storage medium has a computer program stored thereon, and the computer program, when being run, performs the battery total pressure detection method according to any one of claims 1-5.

16. A stacked energy storage system characterized by, The system comprises M battery modules and the battery total pressure detection system according to any one of claims 6-13.

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