Battery cell, battery pack and battery cluster

Abstract

The embodiment of the utility model discloses a battery cell, a battery pack and a battery cluster. The battery cell comprises a battery cell body and an acquisition module, the acquisition module is electrically connected with two ends of the battery cell body and a battery management module of a battery pack where the battery cell is located, and the acquisition module is configured to perform battery cell data acquisition on the battery cell body and is arranged on the battery cell body to form the battery cell; the length of the collection wire harness of each cell in the battery pack can be guaranteed to be consistent, compared with a traditional collection mode, the adopted wire harness is shorter, the technical problem that the collection precision is poor due to the fact that the collection wire harness is too long is solved, meanwhile, the collection module is installed on the cell body, the battery pack is installed more easily in the follow-up process, and the collection efficiency is improved. And meanwhile, subsequent replacement of parts of the battery pack is also facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cell, a battery pack and a battery cluster. BACKGROUND

[0002] The slave board in the battery pack is an important component of the battery management system (BMS), mainly responsible for monitoring and managing the voltage, current, temperature and other parameters of the battery pack. The slave board is usually installed near each battery cell body of the battery pack, collects the voltage and temperature information of the battery cell body, and transmits the collected information to the master control board of the high-voltage box for further processing.

[0003] However, the above-mentioned collection method usually needs to rely on wired connection, and the voltage and temperature data of the battery cell are transmitted to the battery management system through the collection wire harness. Although the above-mentioned method is reliable, it has the problems of high cost, large weight, complex installation and low collection accuracy. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies of the prior art, the present application provides a battery cell, a battery pack and a battery cluster, which can not only reduce the length of the collection wire harness and improve the accuracy of battery cell data collection, but also reduce the installation difficulty of the battery pack, and facilitate the replacement of parts of the battery pack.

[0005] In the first aspect, the present application provides a battery cell, comprising:

[0006] a battery cell body;

[0007] a collection module electrically connected to both ends of the battery cell body and a battery management module of a battery pack in which the battery cell is located;

[0008] The collection module is configured to collect battery cell data of the battery cell body. The collection module is arranged on the battery cell body to form the battery cell.

[0009] Further, in the battery cell provided by the present application, the battery cell further comprises a temperature sensor.

[0010] The collection module further comprises a first end and a second end, and the first end and the second end are respectively electrically connected to both ends of the temperature sensor. The temperature sensor is configured to collect temperature data of the battery cell body.

[0011] Further, in the battery cell provided by the present application, the temperature sensor comprises a water-drop-shaped thermistor.

[0012] Further, in the battery cell provided by the present application, the collection module comprises a first module. The first module is configured to obtain voltage data and temperature data of the battery cell body.

[0013] Further, in the battery cell provided by the application, the first module is further configured to balance the battery cell body.

[0014] Further, in the battery cell provided by the application, the acquisition module further comprises a second module.

[0015] The second module is integrated with the first module to form the acquisition module, and the second module is configured to form at least one of a power supply end, a communication end and a control end of the acquisition module.

[0016] Further, in the battery cell provided by the application, the acquisition module further comprises a storage module.

[0017] The storage module, the first module and the second module are integrated to form the acquisition module.

[0018] Further, in the battery cell provided by the application, the battery management module is configured to communicate with the acquisition module; or / and,

[0019] The battery management module is configured to supply power to the acquisition module.

[0020] In a second aspect, the application further provides a battery pack, which comprises:

[0021] At least one battery cell provided by the first aspect;

[0022] A battery management module electrically connected to the acquisition module of the battery cell.

[0023] In a third aspect, the application further provides a battery cluster, which comprises:

[0024] At least one battery pack provided by the second aspect;

[0025] A high-voltage box electrically connected to the positive electrode and the negative electrode of the battery pack, respectively;

[0026] The high-voltage box is configured to communicate with the battery management system, or / and, is configured to supply power to the battery management module.

[0027] In a fourth aspect, the application provides an energy storage system, which comprises the battery cell provided by the first aspect, or the battery pack provided by the second aspect, or the battery cluster provided by the third aspect.

[0028] The electric core provided by the application comprises an electric core body and a collection module, the collection module is electrically connected to two ends of the electric core body and a battery management module of a battery pack in which the electric core is located, the collection module is configured to collect electric core data of the electric core body, and the collection module is arranged on the electric core body to form the electric core, so that the length of the collection harness of each electric core in the battery pack is consistent, the harness used is shorter than that of a traditional collection method, and the technical problem of poor collection accuracy caused by the harness being too long does not occur, and since the collection module is installed on the electric core body, the battery pack is more easily installed subsequently, and the parts of the battery pack are also more easily replaced subsequently. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] Figure 1 The structural schematic diagram of the electric core provided by the embodiment of the application is shown in the figure.

[0031] Figure 2 The structural schematic diagram of the battery pack provided by the embodiment of the application is shown in the figure.

[0032] Figure 3 The structural schematic diagram of the battery cluster provided by the embodiment of the application is shown in the figure.

[0033] Reference signs:

[0034] 10, battery pack; 100, electric core; 110, electric core body; 120, collection module; 121, first module; 122, second module; 123, storage module; 130, temperature sensor; 200, battery management module; 20, high-voltage box. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are some embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0036] It should be understood that when used in the specification and the appended claims, the terms "comprise" and "include" indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0037] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0038] It should be further understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0039] In addition, in the present application, unless otherwise explicitly specified or limited in the embodiments, the terms "mounting", "connecting", "connecting" and "fixing" and the like appearing in the embodiments should be understood broadly, for example, the connection can be a fixed connection, or a detachable connection, or integrated, which can be understood, or can be a mechanical connection, an electrical connection, etc. Of course, it can also be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements, or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific implementation situation.

[0040] In the related art, the battery pack includes a plurality of series-connected battery cells and a battery management module, which can be understood as a slave board, i.e. a battery management unit (BMU), which can collect the voltage, current and temperature of each battery cell. A relatively long collection line is required between each battery cell and the slave board, which not only leads to a large number of collection harnesses in the battery pack, increasing the cost of the harness, but also is not conducive to providing the energy density of the battery pack, and increases the installation time cost of the battery pack. Moreover, the long and uneven length of the collection line also affects the collection accuracy of the battery cells.

[0041] At the same time, when collecting data, the first battery cell is usually taken as a reference to incrementally collect data from the battery cells, which gradually reduces the accuracy of the collected data of each battery cell, thereby affecting the subsequent balancing strategy and also causing the consistency of the battery cells to deteriorate.

[0042] In addition, since the battery cells are directly connected to the battery management module by the collection line, the collection line at the end of the battery cell bears a high potential, which is prone to insulation abnormalities. Moreover, the external interfaces of battery management modules from different manufacturers are not the same, and the collection line needs to be redesigned each time a different battery management module is used, resulting in poor versatility of the battery pack.

[0043] To this end, the application provides a battery cell, which comprises a battery cell body and a collection module, the collection module is electrically connected to a battery management module of a battery pack in which the battery cell is located, the collection module is configured to collect battery cell data of the battery cell body, and is arranged on the battery cell body to form the battery cell, and can be externally arranged on the battery cell body to form the battery cell, so that the length of the collection harness of each battery cell in the battery pack is consistent, the harness used is shorter than that of the traditional collection method, and the technical problem of poor collection accuracy caused by the excessively long collection harness does not occur, and since the collection module is installed on the battery cell body, the battery pack is more easily installed subsequently, and the parts of the battery pack are also more easily replaced subsequently. In addition, the insulation abnormality problem caused by the collection harness can be solved, the battery management module can also be a general module, the problem that the battery management module needs to be connected to a large number of collection harnesses is avoided, the difficulty of replacing the battery management module on site is reduced, the structural size of the battery management module is reduced, the problem of non-uniform interfaces of the battery management module is also avoided, and the energy density of the battery pack can be increased under the condition that the size of the battery pack is unchanged.

[0044] Please refer to Figure 1 , Figure 1 The structural schematic diagram of the battery cell 100 provided by the embodiment of the application is shown in FIG. 1. Figure 1 As shown in the figure,

[0045] The application provides a battery cell 100, which comprises:

[0046] a battery cell body 110;

[0047] a collection module 120, which is electrically connected to two ends (a positive end B+ and a negative end B-) of the battery cell body 110 and a battery management module 200 of a battery pack 10 in which the battery cell 100 is located;

[0048] The collection module 120 is configured to collect battery cell 100 data of the battery cell body 110, and the collection module 120 is arranged on the battery cell body 110 to form the battery cell 100.

[0049] In the embodiment, the collection module 120 can exist in the form of a PCB (printed circuit board) and be arranged on the battery cell body 110 to assemble into a separate battery cell 100, so that the battery cell 100 itself has the function of data collection, and then the voltage, current and temperature collected by the battery cell 100 itself can be directly sent to the battery management module 200 in the battery pack 10, and the battery management module 200 can collect and package the data and send the data to the main control board in the high-voltage box 20, and the main control board can collect and package the data again and send the data to the main control board for analysis.

[0050] Specifically, each battery cell 100 in the battery pack 10 can be formed by a battery cell body 110 and a collection module 120. After each battery cell 100 is connected in series and parallel, the power supply end and the communication end between the collection modules 120 of the battery cells 100 can be electrically connected to the battery management module 200 after being connected in parallel, and meanwhile, the control end between the collection modules 120 of the battery cells 100 can be electrically connected to the battery management module 200 after being connected in series, so as to realize the control and communication of the battery management module 200 to the collection modules 120 of the battery cells 100.

[0051] Meanwhile, since the collection module 120 is part of the battery cell 100, there is no collection harness between the battery cells 100 and the battery management module 200, but only communication harness, power supply harness and control harness. One end of the communication harness and the power supply harness of each battery cell 100 can be electrically connected to the respective collection module 120, and the other end of the communication harness of each battery cell 100 can be connected after being connected, and then connected to the battery management module 200. The other end of the power supply harness of each battery cell 100 can be connected after being connected, and then connected to the battery management module 200. The collection modules 120 of the battery cells 100 are connected by the control harness, and one of the collection modules 120 of the battery cells 100 can be connected to the battery management module 200 by the control harness, so as to realize the control synchronization of the battery cells 100. In addition, the collection modules of each battery cell in the battery pack are not connected to each other, and there is no problem of insulation abnormality and overvoltage of the collection chip.

[0052] The battery cell 100 provided in the application includes a battery cell body 110 and a collection module 120. The collection module 120 is electrically connected to the battery management module 200 of the battery pack 10 where the battery cell 100 is located. Meanwhile, the collection module 120 is configured to collect the battery cell 100 data of the battery cell body 110 and is arranged on the battery cell body 110 to form the battery cell 100. Thus, the length of the collection harness of each battery cell 100 in the battery pack 10 can be consistent. Compared with the traditional collection method, the harness used is shorter, and the technical problem of poor collection accuracy caused by the collection harness being too long does not occur. Meanwhile, since the collection module 120 is installed on the battery cell body 110, it is easier to install the battery pack 10 subsequently, and it is also convenient to replace the parts of the battery pack 10 subsequently. In addition, the insulation abnormality problem caused by the collection harness can be solved, and the battery management module 200 can also use a general module. Thus, the problem that the battery management module 200 needs to be connected to a large number of collection harnesses is avoided, the difficulty of replacing the battery management module 200 on site is reduced, the structural size of the battery management module 200 is reduced, the production cost of the battery management module 200 is reduced, the problem of non-uniform interfaces of the battery management module 200 is avoided, and the energy density of the battery pack 10 can be increased under the condition that the size of the battery pack 10 is unchanged.

[0053] In some embodiments, as Figure 1As shown, the battery cell 100 further comprises a temperature sensor 130; wherein the acquisition module 120 is provided with a first end N+ and a second end N-, the first end N+ and the second end N- are electrically connected to two ends of the temperature sensor 130 respectively, and the temperature sensor 130 is configured to collect temperature of the battery cell body 110.

[0054] In the embodiment, the battery cell 100 is further provided with the temperature sensor 130, which can be arranged at the battery cell body 110, and two ends of the acquisition module 120 are electrically connected to the temperature sensor 130 respectively to obtain temperature data collected by the temperature sensor 130 on the battery cell body 110.

[0055] The temperature sensor 130 can be a water-drop type thermistor or other types of thermistor, and can also be an infrared temperature sensor 130, which can be selected according to actual application and is not limited in the application.

[0056] In some embodiments, as shown in Figure 1 The acquisition module 120 comprises a first module 121; the first module 121 is configured to obtain voltage data and temperature data of the battery cell body 110.

[0057] In the embodiment, the first module 121 is integrated on the acquisition module 120, and the first module 121 is electrically connected to two ends (positive and negative) of the battery cell body 110 and also electrically connected to the temperature sensor 130, so as to obtain voltage data and temperature data of the battery cell body 110. The temperature sensor 130 can be integrated on the acquisition module 120 or connected to the acquisition module 120 through a collection harness and arranged at the battery cell body 110, and the arrangement position of the temperature sensor 130 can be selected according to actual application and is not limited in the application.

[0058] In some embodiments, the first module 121 is further configured to balance the battery cell body 110.

[0059] In the embodiment, the first module 121 further has the function of balancing the battery cell body 110, when the battery management system in which the battery cell 100 is arranged detects that a certain battery cell 100 needs to be balanced, communication can be performed with the first module 121 in the acquisition module 120 in which the battery cell 100 is arranged, and the first module 121 is used to balance the battery cell 100, so as to achieve consistency of each battery cell 100 in the energy storage system.

[0060] In some embodiments, as shown in Figure 1As shown, the acquisition module 120 also includes a second module 122; wherein the second module 122 is integrated with the first module 121 to form the acquisition module 120, and the second module 122 is configured to form at least one of the power supply terminal, communication terminal and control terminal of the acquisition module 120.

[0061] In this embodiment, the second module 122 can be integrated with the first module 121 on a PCB board to form a data acquisition module 120. The first module 121 and the second module 122 are electrically connected. The second module 122 can be equipped with at least one of a power supply terminal, a communication terminal, and a control terminal, thereby enabling the battery management module 200 to communicate, supply power, and control the data acquisition modules 120 of each cell 100 within the battery pack 10. The power supply terminal can include a 24+ power supply terminal and a 24- power supply terminal; the control terminal can include a DO control terminal and a DI control terminal; and the communication terminal can include a CANL communication terminal and a CANH communication terminal.

[0062] In some embodiments, such as Figure 1 As shown, the acquisition module 120 also includes a storage module 123; wherein, the storage module 123 is electrically connected to the first module 121 and the second module 122 respectively, and the storage module 123, the first module 121 and the second module 122 are integrated to form the acquisition module 120.

[0063] In this embodiment, each battery cell 100's acquisition module 120 may also include a storage module 123, i.e., a memory. The storage module 123 is electrically connected to the first module 121 and the second module 122, respectively. The first module 121, the second module 122, and the storage module 123 can be integrated on a PCB board to form the acquisition module 120. Simultaneously, the storage module 123 can store the battery cell 100 data acquired by the acquisition module 120, and can also store the communication address of the battery cell 100, so that individual battery cells 100 can be traced later.

[0064] In addition, the acquisition module of each cell in the battery pack adopts a communication and power supply isolation circuit design, which can further improve the insulation performance and reliability. This can protect the acquisition module from damage by external high voltage and ensure that the acquisition module is not damaged by the battery management system.

[0065] In some embodiments, the battery management module 200 is configured to communicate with the acquisition module 120 and to supply power to the acquisition module 120.

[0066] In the embodiment, the battery management module 200 can be understood as a slave board in the battery pack 10, i.e., a battery management unit (BMU), which can not collect data of the battery cell 100 in the battery pack 10 in the application. The battery management module 200 can collect the battery cell 100 data collected by the collection module 120 of each battery cell 100 in the battery pack 10, and then send the battery cell 100 data to the master control board of the high-voltage box 20, and then perform data collection and packaging again through the master control board of the high-voltage box 20, and send the data to the general control board, and perform data analysis in the general control board.

[0067] In some embodiments, as shown in Figure 2 The application also provides a battery pack 10, which comprises:

[0068] at least one battery cell 100 provided by the application;

[0069] a battery management module 200 electrically connected to the collection module 120 of the battery cell 100.

[0070] In the embodiment, the battery pack 10 can include a plurality of series-parallel connected battery cells 100. After the battery cells 100 are connected in series, the control ends between the collection modules 120 of the battery cells 100 are electrically connected in turn, and the battery management module 200 can be electrically connected. At the same time, the communication end of the collection module 120 of each battery cell 100 can be electrically connected to the same communication end of the battery management module 200, and the power supply end of the collection module 120 of each battery cell 100 can be electrically connected to the same power supply end of the battery management module 200.

[0071] In some embodiments, as shown in Figure 3 The application also provides a battery cluster, which comprises:

[0072] at least one battery pack 10 provided by the application;

[0073] a high-voltage box 20 electrically connected to the positive and negative electrodes of the battery pack 10, respectively;

[0074] The high-voltage box 20 is configured to communicate with the battery management system and is configured to supply power to the battery management module 200.

[0075] In the embodiment, the battery cluster can include a plurality of series-parallel connected battery packs 10. After the battery packs 10 are connected in series and parallel, they can be externally charged and discharged through the high-voltage box 20. At the same time, the master control board in the high-voltage box 20 can supply power to the battery management module 200 in each battery pack 10, and the high-voltage box 20 communicates with the battery management module 200 in each battery pack 10.

[0076] In some embodiments, the present application provides an energy storage system comprising the battery cell 100 provided by the present application, or the battery pack 10 provided by the present application, or the battery cluster provided by the present application.

[0077] The above description is merely that of the specific embodiments of the present application, but the scope of the protection of the present application is not limited thereto. It will be readily obvious to those skilled in the art that various equivalents substitutions and modifications can be made thereto without departing from the spirit and scope of the present application. Therefore, the scope of the protection of the present application should be limited only by the scope of the claims.

Claims

1. An electric cell, characterized by, The application relates to a battery cell and a battery pack. The battery cell comprises: a battery cell body; a collection module electrically connected to two ends of the battery cell body and a battery management module of a battery pack in which the battery cell is arranged; 2. The electric cell of claim 1, wherein, wherein the collection module is configured to collect battery cell data of the battery cell body; and the collection module is arranged on the battery cell body to form the battery cell. The battery cell further comprises a temperature sensor; 3. The electric cell of claim 2, wherein, wherein the collection module is further provided with a first end and a second end, the first end and the second end are respectively electrically connected to two ends of the temperature sensor, and the temperature sensor is configured to collect temperature data of the battery cell body.

4. The electric cell of claim 1, wherein, The temperature sensor comprises a water-drop-shaped thermistor.

5. The electric cell of claim 4, wherein, The collection module comprises a first module; the first module is configured to acquire voltage data and temperature data of the battery cell body.

6. The electric cell of claim 4, wherein, The first module is further configured to balance the battery cell body. The collection module further comprises a second module; 7. The electric cell of claim 6, wherein, wherein the second module is integrated with the first module to form the collection module, and the second module is configured to form at least one of a power supply end, a communication end and a control end of the collection module. The collection module further comprises a storage module; 8. The electric cell of any one of claims 1-7, wherein, wherein the storage module is electrically connected to the first module and the second module, and the storage module, the first module and the second module are integrated to form the collection module. The battery management module is configured to communicate with the collection module; or / and, 9. A battery pack, characterized by, The battery management module is configured to supply power to the collection module. The application relates to a battery cell and a battery pack. The battery pack comprises:

10. A battery cluster, characterized by at least one battery cell according to any one of claims 1-7; a battery management module electrically connected to the collection module of the battery cell. The application relates to a battery cell and a battery pack. The battery pack comprises: at least one battery pack according to any one of claims 8-9; a high-voltage box electrically connected to a positive electrode and a negative electrode of the battery pack; wherein the high-voltage box is configured to communicate with the battery management system, or / and, is configured to supply power to the battery management module.

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