Battery module and energy storage equipment

Abstract

The invention discloses a battery module and energy storage equipment. The battery module comprises a plurality of battery cells, busbars and a plurality of voltage sampling components, any two adjacent battery cells are connected through the busbar, and the second busbar and the first busbar are different in shape and / or size; the voltage sampling parts are arranged on the busbars, the first busbar is provided with one first voltage sampling part, and the second busbar is provided with two second voltage sampling parts. And the busbar resistance between any two adjacent first voltage sampling parts and the busbar resistance between the adjacent first voltage sampling part and second voltage sampling part are the same. A voltage sampling part is additionally arranged on a busbar for realizing special-shaped connection of battery cells to ensure that the busbar resistances between two adjacent voltage sampling parts for calculating the voltage of the battery cells are the same, so that the partial voltages introduced by the busbar are the same, the sampling precision of the voltage of the battery cells of the battery module can be improved, and the sampling precision of the voltage of the battery cells of the battery module can be improved. And the consistency of the battery module is ensured.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a battery module and energy storage device. Background Art

[0002] To improve space utilization, portable energy storage products often design battery modules into irregular shapes, and sometimes stack the modules into two layers. This increases the difficulty of collecting the voltage of each string in the module. In theory, the voltage at both ends of the battery cell should be collected, but space is limited. For ease of processing, nickel strips or wiring harnesses are welded to the battery bus, resulting in shunts at the voltage collection points.

[0003] The location of the voltage collection point has a great influence on the voltage accuracy. Different bus positions introduce different voltage divisions, resulting in poor consistency of the batteries in the battery pack, affecting battery consistency and thus affecting the cycle life of the battery module and energy storage products.

[0004] Traditional solutions use software compensation to correct the collected voltage. However, temperature differences have different effects on the cell busbars. Factors such as the relative position of the busbar and the collection point and the contact resistance of the welding will affect the collection results. Therefore, the correction error of the collected voltage is large and cannot improve the consistency problem caused by the low accuracy of the collected voltage. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery module and energy storage device. By additionally providing a voltage sampling component on a busbar that realizes the connection of heterogeneous battery cells, the busbar resistance between two adjacent voltage sampling components used to calculate the battery cell voltage is ensured to be the same, thereby ensuring the same voltage division introduced by the busbar. This can improve the sampling accuracy of the battery cell voltage of the battery module and ensure the consistency of the battery module.

[0006] The present application provides a battery module. The battery module includes:

[0007] Multiple battery cells;

[0008] A busbar, through which any two adjacent battery cells are connected, the busbar comprising a first busbar and a second busbar, wherein the second busbar and the first busbar have different shapes and / or sizes;

[0009] Multiple voltage sampling components are arranged on the bus, one first voltage sampling component is provided on the first bus, two second voltage sampling components are provided on the second bus, and the bus resistance between any two adjacent first voltage sampling components and the bus resistance between any two adjacent first voltage sampling components and second voltage sampling components are the same.

[0010] In some embodiments, a plurality of the battery cells are connected in series.

[0011] In some embodiments, one end of the busbar disposed between two adjacent battery cells is connected to the first pole of one of the battery cells, and the other end is connected to the second pole of the other battery cell, and the first pole and the second pole have different polarities.

[0012] In some embodiments, the battery module is a single-layer design.

[0013] In some embodiments, the battery module includes a bracket, a first battery cell and a second battery cell, the first battery cell and the second battery cell are connected in series, the first battery cell and the second battery cell each include at least one battery cell, and the first battery cell and the second battery cell are respectively arranged on the first side and the second side opposite to the bracket.

[0014] In some embodiments, the first battery cell and the second battery cell are connected across the bracket via the second busbar.

[0015] In some embodiments, the battery module is a multi-layer design, comprising a plurality of stacked battery cells, each of which comprises at least one battery cell, and a plurality of the battery cells are connected in series.

[0016] In some embodiments, two adjacent layers of battery cells are connected across layers via the second bus bar.

[0017] In some embodiments, the resistivity and cross-sectional area of ​​each of the busbars are the same, each of the first voltage sampling components is located at the same position on the first busbar, and the relative position of the second voltage sampling component and the adjacent first voltage sampling component is the same as the relative position of two adjacent first voltage sampling components.

[0018] The present application also provides an energy storage device, which includes the battery module of any of the above embodiments.

[0019] In the battery module and energy storage device provided in the embodiments of the present application, different first bus bars and second bus bars are provided. The first bus bar is used to connect two adjacent battery cells that are not connected in a special-shaped manner in the battery module, and the second bus bar is used to connect two adjacent battery cells that are connected in a special-shaped manner. Generally speaking, in order to achieve a special-shaped connection between two adjacent battery cells, the second bus bar and the first bus bar have different shapes and / or sizes.

[0020] When providing voltage sampling components, each first busbar is generally provided with a first voltage sampling component. The voltage between two adjacent first voltage sampling components can represent the voltage of the positive and negative electrodes of the battery cells connected to the two adjacent first voltage sampling components. Because the first busbars are of the same size and the first voltage sampling components are generally located in the same position, the voltage division introduced by the busbar portion between two adjacent first voltage sampling components is also the same.

[0021] As for the second bus, if only one second voltage sampling component is provided, the voltage division introduced by the bus portion between the second voltage sampling component and the adjacent first voltage sampling component is different from the voltage division introduced by the bus portion between two adjacent first voltage sampling components due to the special configuration of the second bus.

[0022] Therefore, the present application additionally sets a second voltage sampling component on the second bus. Each second voltage sampling component can be set according to the position of the adjacent first voltage sampling component, so that the bus resistance between the adjacent first voltage sampling components and the second voltage sampling components is the same as the bus resistance between the two adjacent first voltage sampling components, so that the voltage division introduced by the bus part between the second voltage sampling component and the adjacent first voltage sampling component is the same as the voltage division introduced by the bus part between the two adjacent first voltage sampling components, thereby ensuring the consistency of the voltage sampling of each battery cell, improving the sampling accuracy of the battery cell voltage of the battery module, and ensuring the consistency of the battery module.

[0023] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 is a schematic structural diagram of a battery module provided in certain embodiments of the present application;

[0026] Figure 2 It is a structural schematic diagram of the energy storage device provided in certain embodiments of the present application. DETAILED DESCRIPTION

[0027] The following further describes the embodiments of the present application in conjunction with the accompanying drawings. The same or similar reference numerals in the accompanying drawings represent the same or similar elements or elements with the same or similar functions.

[0028] In addition, the embodiments of the present application described below in conjunction with the accompanying drawings are exemplary and are only used to explain the embodiments of the present application and should not be understood as limiting the present application.

[0029] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0030] See also Figure 1 The embodiment of the present application provides a battery module 10. The battery module 10 includes a plurality of battery cells 11, a bus 12, and a plurality of voltage sampling components 13. Any two adjacent battery cells 11 are connected via the bus 12. The bus 12 includes a first bus 121 and a second bus 122. The second bus 122 and the first bus 121 have different shapes and / or sizes. The voltage sampling components 13 are arranged on the bus 12. The first bus 121 is provided with a first voltage sampling component 131, and the second bus 122 is provided with two second voltage sampling components 132. The resistance of the bus 12 between any two adjacent first voltage sampling components 131 and the resistance of the bus 12 between any two adjacent first voltage sampling components 131 and the resistance of the bus 12 between any two adjacent first voltage sampling components 131 and second voltage sampling components 132 are the same.

[0031] The battery module 10 provided in the embodiment of the present application is provided with different first bus bars 121 and second bus bars 122. The first bus bar 121 is used to connect two adjacent battery cells 11 with non-special-shaped connections in the battery module 10, and the second bus bar 122 is used to connect two adjacent battery cells 11 with special-shaped connections. Generally speaking, in order to achieve a special-shaped connection between two adjacent battery cells 11, the second bus bar 122 and the first bus bar 121 have different shapes and / or sizes.

[0032] When providing the voltage sampling component 13, each first busbar 121 is generally provided with a first voltage sampling component 131. The voltage between two adjacent first voltage sampling components 131 can represent the voltage of the positive and negative electrodes of the battery cells 11 connected to the two adjacent first voltage sampling components 131. Because the first busbars 121 are of the same size and the first voltage sampling components 131 are generally located in the same position, the voltage division introduced by the portion of the busbar 12 between two adjacent first voltage sampling components 131 is also the same.

[0033] As for the second bus 122, if only one second voltage sampling component 132 is provided, due to the special configuration of the second bus 122, the voltage division introduced by the portion of the bus 12 between the second voltage sampling component 132 and the adjacent first voltage sampling component 131 is different from the voltage division introduced by the portion of the bus 12 between two adjacent first voltage sampling components 131.

[0034] Therefore, the present application additionally sets a second voltage sampling component 132 on the second bus 122. Each second voltage sampling component 132 can be set according to the position of the adjacent first voltage sampling component 131, so that the resistance of the bus 12 between the adjacent first voltage sampling component 131 and the second voltage sampling component 132 is the same as the resistance of the bus 12 between the two adjacent first voltage sampling components 131. As a result, the voltage division introduced by the bus 12 part between the second voltage sampling component 132 and the adjacent first voltage sampling component 131 is the same as the voltage division introduced by the bus 12 part between the two adjacent first voltage sampling components 131, thereby ensuring the consistency of the voltage sampling of each battery cell 11, improving the sampling accuracy of the battery cell 11 voltage of the battery module 10, and ensuring the consistency of the battery module 10.

[0035] In this way, by improving voltage collection, the collection of the highest charging voltage and the lowest discharging voltage can be improved, the accuracy of the charging and discharging control strategy can be improved, and the safety and cycle life of the mobile energy storage power supply can be improved.

[0036] Please continue reading Figure 1 , the battery module 10 of the present application is explained in detail below:

[0037] The battery module 10 includes a plurality of battery strings, which include a plurality of battery cells 11 , a bus bar 12 , and a plurality of voltage sampling components 13 .

[0038] A battery string is a battery assembly consisting of multiple batteries connected in series, which is mainly used to increase the voltage output of the battery system or meet the power requirements of specific equipment.

[0039] For example, the positive electrode of the previous battery cell 11 is connected to the negative electrode of the next battery cell 11 in sequence (such as the positive electrode of battery cell 11A → the negative electrode of battery cell 11B → the positive electrode of battery cell 11C...), and finally a circuit connected end to end is formed.

[0040] Optionally, multiple battery strings are connected in series and / or in parallel.

[0041] Among them, the battery cell 11 is the core part of the battery and also the energy storage unit. It is a key component for realizing the mutual conversion between electrical energy and chemical energy.

[0042] The battery cell 11 includes a positive electrode and a negative electrode. These are where chemical reactions occur within the battery cell 11. During charging, the positive electrode absorbs electrons and the negative electrode releases them, generating an electric current. Common positive electrode materials include lithium cobalt oxide, lithium nickel oxide, and lithium manganese oxide, while negative electrode materials include graphite and silicon-carbon composites.

[0043] Optionally, the battery cell 11 may be a small cylindrical single battery cell, a rectangular single battery cell, etc.

[0044] Optionally, multiple battery cells 11 are connected in series.

[0045] The busbar 12 is a conductor used to collect, distribute and transmit electrical energy. It is usually made of a highly conductive material (such as copper or aluminum) and has the characteristics of low resistance, high current carrying capacity and stable structure.

[0046] The busbar 12 is used to connect any two adjacent battery cells 11 , and to connect the positive and negative electrodes of the first battery cell 11 and the last battery cell 11 of the battery string.

[0047] Optionally, one end of the busbar 12 disposed between two adjacent battery cells 11 is connected to the first pole of one of the battery cells 11 , and the other end is connected to the second pole of the other battery cell 11 , and the first pole and the second pole have different polarities.

[0048] For example, the first electrode is one of the positive and negative electrodes, and the second electrode is the other of the positive and negative electrodes. For example, one end of the busbar 12 is connected to the positive electrode of the previous battery cell 11 , and the other end is connected to the negative electrode of the next battery cell 11 .

[0049] For another example, a pole of the first battery cell 11 that is not connected to the next battery cell 11 is connected to a busbar 12 , and a pole of the last battery cell 11 that is not connected to the previous battery cell 11 is connected to a busbar 12 .

[0050] Optionally, the busbar 12 includes a first busbar 121 and a second busbar 122 , and the second busbar 122 and the first busbar 121 have different shapes and / or sizes.

[0051] The first busbar 121 is a busbar 12 connecting two adjacent battery cells 11 that are not connected in a special-shaped manner, and the second busbar 122 is a busbar 12 connecting two adjacent battery cells 11 that are connected in a special-shaped manner.

[0052] For example, the shapes and sizes of the first bus 121 between any two adjacent non-specially connected battery cells 11, the first bus 121 connected to the positive or negative electrode of the first battery cell 11, and the first bus 121 connected to the positive or negative electrode of the last battery cell 11 are all the same; while the shape and / or size of the second bus 122 and the first bus 121 between two special-shaped battery cells 11 are different.

[0053] In other words, two adjacent battery cells 11 connected by the first busbar 121 of the same shape and size are non-special-shaped connections, and two adjacent battery cells 11 connected by the second busbar 122 of different shapes and sizes are special-shaped connections.

[0054] Optionally, the resistivity and cross-sectional area of ​​each busbar 12 are the same, each first voltage sampling component 131 is located at the same position of the first busbar 121, and the relative position of the second voltage sampling component 132 and the adjacent first voltage sampling component 131 is the same as the relative position of two adjacent first voltage sampling components 131.

[0055] In this way, by setting the resistivity and cross-sectional area of ​​the busbar 12 to be the same, the resistance of the busbar 12 between two adjacent voltage sampling components 13 can be adjusted simply by controlling the length of the busbar 12 between two adjacent voltage sampling components 13 (e.g., adjusting the relative positions of the two adjacent voltage sampling components 13). If the length of the busbar 12 between two adjacent voltage sampling components 13 is the same, the resistance of the busbar 12 between the two adjacent voltage sampling components 13 can be made the same.

[0056] For example, if all the first voltage sampling components 131 are located at the same position on the first bus 121, the length of the bus 12 between any two first voltage sampling components 131 can be the same; and if the relative position of the second voltage sampling component 132 and the adjacent first voltage sampling component 131 is the same as the relative position of the two adjacent first voltage sampling components 131, the length of the bus 12 between the second voltage sampling component 132 and the adjacent first voltage sampling component 131 can be the same as the length of the bus 12 between any two first voltage sampling components 131.

[0057] Optionally, a plurality of voltage sampling components 13 are provided on the busbar 12 .

[0058] The plurality of voltage sampling components 13 include a first voltage sampling component 131 and a second voltage sampling component 132. The first bus 121 is provided with a one-to-one correspondence with the first voltage sampling component 131, and the second bus 122 is provided with two second voltage sampling components 132. That is, the first bus 121 is provided with one first voltage sampling component 131, and the second bus 122 is provided with two second voltage sampling components 132.

[0059] Compared with the current solution, each bus 12 is provided with a voltage sampling component 13. Due to the special configuration of the second bus 122, the voltage division introduced by the bus 12 portion between the second voltage sampling component 132 and the adjacent first voltage sampling component 131 is different from the voltage division introduced by the bus 12 portion between the two adjacent first voltage sampling components 131. In this application, an additional second voltage sampling component 132 is provided on the second bus 122. Each second voltage sampling component 132 can be provided according to the position of the adjacent first voltage sampling component 131, so that the adjacent The resistance of the bus 12 between the first voltage sampling component 131 and the second voltage sampling component 132 is the same as the resistance of the bus 12 between two adjacent first voltage sampling components 131, so that the voltage division introduced by the bus 12 part between the second voltage sampling component 132 and the adjacent first voltage sampling component 131 is the same as the voltage division introduced by the bus 12 part between two adjacent first voltage sampling components 131, thereby ensuring the consistency of the voltage sampling of each battery cell 11, improving the sampling accuracy of the battery cell 11 voltage of the battery module 10, and ensuring the consistency of the battery module 10.

[0060] Please refer again Figure 1 In some embodiments, the battery module 10 is a single-layer design.

[0061] Optionally, the battery module 10 includes a bracket 14, a first battery cell 15 and a second battery cell 16, each of the first battery cell 15 and the second battery cell 16 includes at least one battery cell 11, and the first battery cell 15 and the second battery cell 16 are respectively arranged on the first and second opposite sides of the bracket 14.

[0062] The bracket 14 includes a plurality of battery cell 11 mounting positions, and each battery cell 11 mounting position is used to mount one battery cell 11 .

[0063] The busbar 12 is arranged on the bracket 14 and is arranged opposite to the installation position of the battery cell 11. After the battery cell 11 is installed in the installation position of the battery cell 11, the busbar 12 is connected to the positive and negative electrodes of the battery cell 11.

[0064] by Figure 1 Taking the special-shaped single-layer battery module 10 as an example, the bracket 14 includes a first side and a second side relative to each other, the first side is provided with a first battery unit 15, and the second side is provided with a second battery unit 16, the first battery unit 15 includes battery cells 1-3, and the second battery unit 16 includes battery cells 4-8. In order to realize the series connection of the first battery unit 15 and the second battery unit 16, it is necessary to connect the adjacent battery cells 3 and 4 across the bracket 14. Therefore, the second bus 122 (the bus 12 between the battery cells 3 and 4) is used to connect the battery cells 3 and 4 across the bracket 14.

[0065] It can be seen that the shape and size of the second busbar 122 between the battery cells 3 and 4 are different from the shapes and sizes of the other first busbars 121 , thereby realizing a special-shaped battery module 10 .

[0066] Voltage sampling components B3 and B4 are set on the second bus 122 between battery cells 3 and 4, wherein the voltage between B3 and B2 is used to characterize the voltage of battery cell 3, and the voltage between B5 and B4 is used to characterize the voltage of battery cell 4. It can be understood that since the resistance of the bus 12 between B3 and B4 and the resistance of the bus 12 between B5 and B4 are the same as the resistance of the bus 12 between any two other first voltage sampling components 131 (such as between B0 and B1, between B9 and B8, etc.), the consistency of the voltage sampling of each battery cell 11 is ensured.

[0067] Since the divided voltage of the bus 12 between the two voltage sampling components 13 corresponding to each battery cell 11 is consistent, the voltage of each battery cell 11 can be calculated based on the voltage difference between the corresponding two voltage sampling components 13 and the resistance of the same bus 12 .

[0068] When charging, U 采集 =U cell +I(R1+R2); in the case of discharge, U 采集 =U cell -I(R1+R2).

[0069] Among them, U cell is the voltage across a single battery cell 11;

[0070] U 采集 The collected voltage of a single cell 11; for example, U1 采集 =B1-B0,U2 采集 =B2-B1,U3 采集 =B3-B2,U4 采集 =B5-B4, U5 采集 =B6-B5, U6 采集 =B7-B6, U7 采集 =B8-B5, U8 采集 =B9-B8.

[0071] R1 and R2 are resistances of two parts of the busbar 12 between two voltage sampling points corresponding to the battery cell 11 .

[0072] See also Figure 2 In some embodiments, the battery module 10 is a multi-layer design, and the battery module 10 includes a plurality of stacked battery cells, each of which includes at least one battery cell 11 .

[0073] Each layer of the battery module 10 includes a bracket 14 , which also includes a mounting position for a battery cell 11 , and the battery cell 11 is mounted in the mounting position to form a battery unit.

[0074] In order to realize the series connection of multiple battery cells 11 units, it is necessary to connect the battery cells 11 units of two adjacent layers together.

[0075] Optionally, two adjacent layers of battery cells are connected across the layers via a second bus bar 122 .

[0076] by Figure 2 Taking the heterogeneous multilayer battery module 10 as an example, the battery module 10 comprises two layers, each layer comprising multiple battery cells 17, and each battery cell 17 comprising six battery cells 11. Two adjacent battery cells 11 within any battery cell 17 can be connected using a non-heterogeneous first busbar 121. Two adjacent battery cells 17 on the same layer can also be connected using the first busbar 121. However, any two battery cells 17 in a stacked arrangement must be connected using a heterogeneous second busbar 122.

[0077] For example, in two adjacent battery units 17 that are stacked, one battery unit 17 includes battery cells 1-6, and the other battery unit 17 includes battery cells 7-12.

[0078] The second busbar 122 that crosses the layers and connects two adjacent battery cells 17 is provided with voltage sampling components B6 and B7, wherein the voltage between B6 and B5 is used to characterize the voltage of battery cell 6, and the voltage between B8 and B7 is used to characterize the voltage of battery cell 7. It can be understood that since the resistance of the busbar 12 between B6 and B5 and the resistance of the busbar 12 between B8 and B7 are the same as the resistance of the busbar 12 between any two other first voltage sampling components 131 (such as between B0 and B1, between B2 and B1, between B12 and B11, etc.), the consistency of the voltage sampling of each battery cell 11 is ensured.

[0079] For example, the collected voltage of each battery cell 11 is as follows:

[0080] U1 采集 =B1-B0,U2 采集 =B2-B1,U3 采集 =B3-B2,U4 采集 =B4-B3, U5 采集 =B5-B4, U6 采集 =B6-B5,U7 采集 =B8-B7, U8 采集 =B9-B8, U9 采集 =B10-B9,U10 采集 =B11-B10,U11采集 =B12-B11,U12 采集 =B13-B12.

[0081] The present application further provides an energy storage device 100 , which includes the battery module 10 according to any of the above embodiments and a battery management system. The battery management system is connected to a plurality of voltage sampling components 13 .

[0082] Among them, the energy storage device 100 is a device for storing energy. It can store energy when there is excess energy and release the stored energy when needed to meet the needs of various application scenarios.

[0083] Alternatively, the energy storage device 100 may be a portable energy storage power supply. A portable energy storage power supply is a small energy storage system with a built-in lithium-ion battery that can provide a stable AC / DC voltage output and has the characteristics of large capacity, high power, safety, and portability.

[0084] The battery management system (BMS) is the core component of the energy storage device 100. It is responsible for monitoring, managing, and controlling the operating status of the battery module 10, ensuring the safe and efficient operation of the battery module 10. A BMS typically consists of two major components: hardware and software. The hardware component mainly includes a microcontroller unit (MCU), various sensors, isolation circuits, and communication interfaces; the software component includes monitoring algorithms, control logic, and fault diagnosis programs.

[0085] In some embodiments, the battery management system includes multiple analog front ends, which are connected to multiple voltage sampling components 13 to collect voltages of the multiple voltage sampling components 13 .

[0086] The battery module 10 may include multiple ones, and the output voltage of the battery module 10 can meet the power supply voltage of the corresponding analog front end. The analog front end and the battery module 10 are set in a one-to-one correspondence. The analog front end is used to connect the various voltage sampling components 13 in the corresponding battery module 10 to collect the collection voltage of each battery cell 11.

[0087] Among them, the analog front end (AFE) is an important component in the electronic system. It is located between the signal source and the digital processing system, and is responsible for converting analog signals into digital signals and performing necessary preprocessing on these signals.

[0088] Specifically, since the present application realizes the high-voltage output of the energy storage device 100 by connecting multiple battery cells 11 in series, and the operating voltage of the analog front end is generally low (lower than the output voltage of the energy storage device 100), in order to ensure that the analog front end can normally collect the battery information of the battery module 10, the battery module 10 can be divided into multiple battery modules 10, and an analog front end is set for each battery module 10, so that the output voltage of the battery module 10 meets the power supply voltage of the analog front end, so as to realize the collection of battery information of each battery module 10, thereby realizing the collection of battery information of the entire battery module 10.

[0089] For example, the operating voltage of the analog front end is 60V, the battery module 10 includes 36 battery cells 11, each battery cell is 115V, therefore, the battery module 10 can be divided into a first battery group 121, a second battery group 122 and a third battery group 123, each battery module 10 includes 12 battery cells 11 (that is, the output voltage of each battery module 10 is 60V).

[0090] The analog front-end also includes three components: a first analog front-end, a second analog front-end, and a third analog front-end. The first analog front-end connects the negative electrode of the battery module 10 and the positive electrode of the first battery pack 121. The second analog front-end connects the negative electrode of the first battery pack 121 and the positive electrode of the second battery pack 122. The third analog front-end connects the negative electrode of the second battery pack 122 and the positive electrode of the third battery pack 123. The power supply voltage of the first, second, and third analog front-ends is 60V, ensuring the normal operation of each analog front-end.

[0091] In some embodiments, the energy storage device 100 further includes a photovoltaic panel and an inverter.

[0092] The photovoltaic panel (PV) can generate photovoltaic power and store energy for the battery module 10 .

[0093] An inverter is a power electronic device whose main function is to convert direct current (DC) into alternating current (AC). This conversion is very important in many modern technologies and applications, especially in renewable energy systems (such as solar and wind power generation systems), uninterruptible power supplies (UPS), electric vehicle charging stations, and industrial and household appliances.

[0094] The inverter can convert the high-voltage output of the battery module 10 of the energy storage device 100 into high-voltage alternating current for use by electronic devices that require alternating current to drive, thereby achieving high-voltage power supply.

[0095] Throughout this specification, reference to the terms "certain embodiments," "one embodiment," "some examples," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0096] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include at least one feature. In the description of this application, "plurality" means at least two, for example, two or three, unless otherwise specifically defined.

[0097] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery module, characterized in that: include: Multiple battery cells; A busbar, through which any two adjacent battery cells are connected, the busbar comprising a first busbar and a second busbar, wherein the second busbar and the first busbar have different shapes and / or sizes; Multiple voltage sampling components are arranged on the bus, one first voltage sampling component is provided on the first bus, two second voltage sampling components are provided on the second bus, and the bus resistance between any two adjacent first voltage sampling components and the bus resistance between any two adjacent first voltage sampling components and second voltage sampling components are the same.

2. The battery module according to claim 1, wherein: A plurality of the battery cells are connected in series.

3. The battery module according to claim 1, wherein: One end of the busbar arranged between two adjacent battery cells is connected to the first pole of one of the battery cells, and the other end is connected to the second pole of the other battery cell, and the first pole and the second pole have different polarities.

4. The battery module according to claim 1, wherein: The battery module is a single-layer design.

5. The battery module according to claim 4, characterized in that: The battery module includes a bracket, a first battery cell and a second battery cell, the first battery cell and the second battery cell are connected in series, the first battery cell and the second battery cell each include at least one battery cell, and the first battery cell and the second battery cell are respectively arranged on the first side and the second side opposite to the bracket.

6. The battery module according to claim 5, characterized in that: The first battery unit and the second battery unit are connected across the bracket via the second bus bar.

7. The battery module according to claim 1, characterized in that: The battery module is a multi-layer design, comprising a plurality of battery cells stacked together, each battery cell comprising at least one battery core, and a plurality of the battery cells being connected in series.

8. The battery module according to claim 7, characterized in that: The battery cells in two adjacent layers are connected across the layers via the second busbar.

9. The battery module according to claim 1, wherein: The resistivity and cross-sectional area of ​​each busbar are the same, each first voltage sampling component is located at the same position of the first busbar, and the relative position of the second voltage sampling component and the adjacent first voltage sampling component is the same as the relative position of two adjacent first voltage sampling components.

10. An energy storage device, characterized in that: It comprises the battery module and battery management system according to any one of claims 1 to 9, wherein the battery management system is connected to a plurality of the voltage sampling components.

Images