Battery system, electric energy equipment and battery system assembling method

Abstract

The embodiment of the invention provides a battery system, electric energy equipment and a battery system assembling method. The battery system comprises a battery cell group and a connecting assembly, wherein battery cell modules in the battery cell group are connected in series; the connecting assembly comprises a first bonding pad group and a second bonding pad group which are insulated from each other, and the first bonding pad group comprises a plurality of first bonding pads which are insulated from each other. At least two sampling points in the battery cell group are electrically connected with the first bonding pad, and a first arrangement serial number of the first bonding pad connected with the sampling points in the first bonding pad group is irrelevant to a second arrangement serial number of the sampling points in the battery cell group. And the first bonding pad connected with the sampling point is electrically connected with the second bonding pad corresponding to the second arrangement sequence number in the second bonding pad group. According to the method, the voltage values at the first bonding pad are tested and sorted, so that the problems of high difficulty, low efficiency and high error rate of manual sorting of the sampling lines in the existing scheme are solved.

Description

Technical Field

[0001] The present application relates to the technical field of battery systems, and in particular to a battery system, an electric energy device, and a battery system assembly method. Background Art

[0002] As energy demands from electrical devices increase, the voltage range of single-cell batteries, limited by their internal cell structure and voltage characteristics, is limited, making it difficult to meet the requirements of high-power applications. Therefore, multiple single-cell batteries are often connected in series to form a battery pack to increase overall voltage and power output. However, individual differences between cells can easily lead to uneven charging and discharging, which can lead to safety hazards such as overcharging and over-discharging.

[0003] Existing technologies primarily prevent these issues by detecting the cell voltages in the battery pack. The plug-and-wire solution, due to its low cost and convenient operation, has become the mainstream method for detecting cell voltages in the industry. This solution connects a plug and wire to transmit the cell voltage signal to the battery management system for testing.

[0004] While the plug-and-wire solution is cost-effective and flexible, in practice, the large number of cell strings makes the installation of sampling cables extremely complex. This process relies heavily on manual wiring, requiring assemblers to spend a significant amount of time connecting the sampling cables one by one. Furthermore, wiring errors can easily occur due to human error, complicating subsequent maintenance and management. Summary of the Invention

[0005] The battery system, electric energy equipment, and battery system assembly method provided in the embodiments of the present application are used to improve the connection efficiency and accuracy of the battery system sampling lines.

[0006] In a first aspect, an embodiment of the present application provides a battery system, comprising:

[0007] A battery cell group, wherein the battery cell modules in the battery cell group are connected in series;

[0008] A connecting component, the connecting component comprising a first pad group and a second pad group insulated from each other; the first pad group comprises a plurality of first pads insulated from each other; the second pad group comprises a plurality of second pads insulated from each other;

[0009] At least two sampling points in the battery cell group are electrically connected to the first pads, respectively, wherein the first pads connected to the sampling points have a first arrangement number in the first pad group, which is independent of the second arrangement number of the sampling points in the battery cell group;

[0010] The first pad connected to the sampling point is electrically connected to each of the second pads corresponding to the second arrangement number in the second pad group.

[0011] In a possible implementation manner, the first pad includes: a first sub-pad and a second sub-pad, and the first sub-pad is electrically connected to the second sub-pad;

[0012] At least two of the sampling points in the cell group are electrically connected to the first sub-pad of the first pad;

[0013] The second sub-pad of the first pad connected to the sampling point is electrically connected to the second pad of the second pad group with the second arrangement number corresponding to the sampling point.

[0014] In a possible implementation manner, the first pad group and the second pad group are both arranged on the same circuit board.

[0015] In a possible implementation, the battery system further includes: a battery management system, the battery management system including: a sampling unit;

[0016] The second pads in the second pad group are electrically connected to the terminals in the sampling unit corresponding to the second arrangement number.

[0017] In one possible implementation, the sampling unit includes at least any one of the following:

[0018] Analog front-end unit, control unit, protection integrated unit.

[0019] In one possible embodiment, the sampling points of the battery cell group include: a sampling point located at the positive electrode of the first battery cell module, a sampling point located on the connecting line of the adjacent battery cell modules, and a sampling point located at the negative electrode of the last battery cell module.

[0020] In a second aspect, an embodiment of the present application provides an electric energy device, which includes any possible implementation of the first aspect above.

[0021] In a third aspect, an embodiment of the present application provides a method for assembling a battery system, wherein the battery system includes a cell group and a connection assembly, wherein a plurality of cell modules in the cell group are connected in series;

[0022] The sampling points of the battery cell group include: a sampling point located at the positive electrode of the first battery cell module, a sampling point located on the connection line of the adjacent battery cell modules, and a sampling point located at the negative electrode of the last battery cell module;

[0023] The connection assembly includes a first pad group and a second pad group insulated from each other; the first pad group includes a plurality of first pads insulated from each other; the second pad group includes a plurality of second pads insulated from each other;

[0024] The method comprises:

[0025] Electrically connecting at least two sampling points of the battery cell group to the first pads, respectively, wherein the first pads to which the sampling points are connected have a first arrangement number in the first pad group that is independent of a second arrangement number of the sampling points in the battery cell group;

[0026] measuring the voltage value at each of the first pads;

[0027] Determining a mapping relationship between the first arrangement number and the second arrangement number based on a voltage value at each of the first pads;

[0028] According to the mapping relationship, the first pad connected to the sampling point is electrically connected to each of the second pads in the second pad group corresponding to the second arrangement number.

[0029] In a possible implementation, determining the mapping relationship between the first arrangement number and the second arrangement number based on the voltage value at each of the first pads includes:

[0030] Determining the second arrangement sequence number corresponding to each first soldering pad based on the voltage value at each first soldering pad and the reference voltage of the battery cell group;

[0031] The mapping relationship is determined based on the first arrangement sequence number of each of the first pads in the first pad group and the corresponding second arrangement sequence number.

[0032] In a possible implementation, determining the second arrangement number corresponding to each first pad based on the voltage value at each first pad and a reference voltage includes:

[0033] Obtaining a voltage difference between a voltage value at each of the first pads and a voltage value at a reference point;

[0034] sorting the first pads based on a quotient of a voltage difference corresponding to each of the first pads and a reference voltage;

[0035] The second arrangement sequence number corresponding to each first pad is determined based on the sorting position of each first pad.

[0036] In one possible implementation, the method further includes:

[0037] The reference voltage of the battery cell group is determined based on an average value of the voltages at the first pads.

[0038] In a possible implementation manner, the first pad includes: a first sub-pad and a second sub-pad, and the first sub-pad is electrically connected to the second sub-pad;

[0039] The step of electrically connecting the at least two sampling points of the battery cell group to the first pads respectively includes:

[0040] electrically connecting at least two sampling points of the battery cell group to the first sub-pad of the first pad respectively;

[0041] The step of electrically connecting the first pad connected to the sampling point with each of the second pads in the second pad group corresponding to the second arrangement number according to the mapping relationship includes:

[0042] According to the mapping relationship, the second sub-pad of the first pad connected to the sampling point is electrically connected to each of the second pads corresponding to the second arrangement number in the second pad group.

[0043] In a possible implementation, electrically connecting the first pad connected to the sampling point with each of the second pads corresponding to the second arrangement number in the second pad group according to the mapping relationship includes:

[0044] inputting the mapping relationship into a jumper device;

[0045] The jumper device is controlled to electrically connect the first pad connected to the sampling point with each of the second pads corresponding to the second arrangement number in the second pad group according to the mapping relationship.

[0046] The battery system, electric energy equipment, and battery system assembly method provided in the embodiments of the present application use sampling lines to establish electrical connections between at least two sampling points in a cell group and pads in a first pad group in a random order, without presetting a wiring path, thereby significantly shortening the time it takes to lay the sampling lines. After the connection is completed, the voltage information at the first pad is measured, and the mapping relationship between the first arrangement number of the first pad and the second arrangement number of the sampling point in the cell group is determined based on the voltage information. The first pad is connected to the second pad of the second pad group according to the mapping relationship, so that the arrangement order of the sampling lines connected to the second pad in the second pad group is consistent with the actual distribution of the sampling points in the cell group, effectively eliminating the time-consuming sorting process in manual wiring, improving wiring efficiency, and avoiding errors caused by human operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0048] Figure 1 A schematic diagram of the structure of the existing sampling line and battery system assembly;

[0049] Figure 2 It is a structural diagram of an existing plug wire solution;

[0050] Figure 3 A schematic diagram of the structure of a battery system provided in this application Figure 1 ;

[0051] Figure 4 A schematic diagram of the structure of a battery system provided in this application Figure 2 ;

[0052] Figure 5 A schematic diagram of the structure of a sampling line and battery system assembly provided in this application;

[0053] Figure 6 A schematic diagram of a battery system assembly method provided in this application;

[0054] Figure 7 A schematic diagram of the structure of a battery system provided in this application Figure 3 .

[0055] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] 1-battery cell group; 11-battery cell module;

[0057] 2- Connector;

[0058] 3- sampling line;

[0059] 4-connection component; 41-first pad group; 42-second pad group; 43-first pad; 44-second pad; 45-first sub-pad; 46-second sub-pad. DETAILED DESCRIPTION

[0060] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0061] As a key component for energy storage and conversion in electrical equipment, a battery system typically includes battery cells and a battery management system (BMS). Battery cells are the core energy storage unit of a battery system. Battery cell performance parameters, such as capacity, internal resistance, and charge / discharge efficiency, directly impact the overall performance of the battery system. The BMS is responsible for comprehensive data acquisition and testing of the battery cells to ensure safe, stable, and efficient operation of the battery system.

[0062] With the growing power demand of electrical energy devices, battery systems, due to limitations in their internal cell structure and voltage characteristics, have a limited voltage range (typically within 1-5V), making them unable to meet the requirements of high-power applications. In this context, cell stacks, consisting of multiple cell modules connected in series, have become an effective way to increase battery system power. However, due to limitations in cell manufacturing processes, individual differences in capacity, internal resistance, and state of charge are inevitable between cells. Without effective management of cell stack voltage, abnormalities such as overcharging and short circuits can easily occur during the charging and discharging process, leading to serious safety issues such as fires and combustion, and even damage to the battery system, resulting in significant economic losses. Therefore, it is crucial for the battery system's BMS to accurately monitor and manage cell stack voltage.

[0063] The plug-and-wire solution has become the mainstream battery system voltage detection method due to its low cost, convenience and flexibility. Figure 1 The schematic diagram of the structure of the existing sampling line and battery system assembly is as follows: Figure 1 As shown in the figure, during the assembly of the battery system, sampling lines connect the sampling points in the battery pack to the BMS. The voltage signals at each sampling point in the battery pack are transmitted to the BMS via the sampling lines, allowing the BMS to perform effective processing and maintenance based on this voltage information.

[0064] The battery modules in the above-mentioned battery group are connected in series. The battery module can include one battery cell or be composed of multiple battery cells connected in series and / or in parallel. This application does not limit this. The battery cell is the core component of the battery system and is the key component for the battery system to realize the charging and discharging functions. By connecting the positive and negative electrodes of multiple battery modules in sequence, the voltage of each battery module can be superimposed, thereby increasing the electrical power of the battery system.

[0065] The sampling points of the battery cell group include: a sampling point at the positive electrode of the first battery cell module, a sampling point located on the connection line between adjacent battery cell modules, and a sampling point at the negative electrode of the last battery cell module. The order of the sampling points can represent the position of the corresponding battery cell modules in the battery cell group. Among them, the sampling point located on the connection line between adjacent battery cell modules can be located on the negative electrode side of the previous battery cell module, on the positive electrode side of the next battery cell module, or at any point connecting two battery cell modules.

[0066] For example, assuming that there are three battery cell modules connected in series in the order of positive to negative pole, and the three battery cell modules are numbered A, B, and C, then the battery cell group includes four sampling points, namely: the sampling point of the positive pole of battery cell module A, the sampling point on the series circuit of battery cell module A and battery cell module B, the sampling point on the series circuit of battery cell module B and battery cell module C, and the sampling point of the negative pole of battery cell module C.

[0067] It is understandable that because the cell modules in the cell group are connected in series, when the series circuit is working normally, there is a potential difference between the cell modules, and the voltage at both ends of each cell module is different. By setting the sampling points in the above manner, it is possible to have a sampling point between the positive and negative poles of any cell module, so that the voltage of the cell module can be measured based on the sampling points of its positive and negative poles. Therefore, when the voltage of any cell module is abnormal, the position of the abnormal cell module in the cell group can be quickly located, which is helpful for troubleshooting and repairing the battery system.

[0068] Figure 2 The structure diagram of the existing plug wire solution is shown in FIG. Figure 2 As shown, multiple cell modules 11 are connected to the connector 2 via multiple sampling lines 3. Multiple pins are provided on the connector end according to the arrangement order of the sampling points in the cell group. The arrangement order of the multiple pins is consistent with the arrangement order of the sampling points in the cell group. Therefore, when connecting the sampling lines 3, the assembler needs to identify and sort the sampling lines 3 one by one, arrange the positions of the sampling lines 3 reasonably, and connect the sampling points to the pins on the connector end through the sampling lines 3 to ensure that the arrangement order of the sampling points in the cell group strictly corresponds to the arrangement order of the connector pins. However, when there are many cell groups, the installation process of the sampling lines 3 will become complicated and tedious. Not only will the installation take a long time, but the sampling lines 3 may also be connected incorrectly.

[0069] Connector 2 is used to connect to the BMS to collect and transmit voltage information from the cell modules 11 in the cell pack. Through the connector pin design, connector 2 can map the voltage signal of each cell module 11 in the cell pack to the BMS sampling unit, allowing the BMS to analyze and manage the cell pack voltage information and ensure that the cell pack operates efficiently within a safe voltage range. For example, it can be connected to the analog front-end unit, control unit, or protection integrated unit in the BMS to collect cell pack voltage information.

[0070] Among them, the analog front-end unit (AFE) is a bridge connecting the analog signals of the physical world and the digital processing system. It is responsible for amplifying, filtering, and performing analog-to-digital conversion on the analog signals (such as voltage, current, temperature, etc.) output by the sensor, converting them into digital signals and transmitting them to the control unit or other digital processing units.

[0071] The Microcontroller Unit (MCU) is the core of the embedded system. It integrates modules such as processor, random access memory (RAM), read-only memory (ROM), timer, analog-to-digital / digital-to-analog converter, and communication interface. It is responsible for executing control algorithms, data processing, and system management.

[0072] The Protection Integrated Circuit (Protection IC) is a key component in the battery management system. It is responsible for monitoring the battery status and implementing protection mechanisms such as overcharge, over-discharge, overcurrent, and short circuit to prevent battery damage or safety accidents.

[0073] The existing technology also proposes an integrated sampling solution, which uses integrated printed circuit boards, flexible circuit boards, flexible flat cables, coated metal parts and other materials and structures. By rationally arranging sampling lines and interfaces on the integrated components, the integrated components are precisely connected to the sampling points of each battery cell module of the battery pack. At the same time, the integrated components are provided with an interface for communicating with the BMS, thereby establishing an electrical connection channel between the battery cell group and the BMS to realize battery voltage sampling.

[0074] However, this solution requires custom-made, integrated components, which are complex to manufacture and require high precision, resulting in relatively high costs. Furthermore, the integrated components are not universally compatible with battery packs of varying specifications and models, further limiting their large-scale application.

[0075] In addition, existing technologies also include solutions for installing battery sampling lines using automated equipment. Automated equipment typically features high-precision robotic arms and advanced visual recognition systems. During installation, the visual recognition system first accurately locates the positions of each sampling point on the battery pack, while also identifying the specifications and routing requirements for the sampling line. Subsequently, the robotic arm, following a pre-set procedure, accurately grasps the sampling line, precisely connecting one end to the corresponding sampling point on the battery pack. Following the established route plan, the other end of the sampling line is connected to the relevant interface of the BMS, completing the installation of the sampling line.

[0076] While these solutions can improve assembly efficiency, the purchase and maintenance costs of automated equipment are high, and specialized assembly personnel are required to maintain and operate the equipment. Furthermore, automated equipment has stringent requirements for cell size, shape, and operating environment, limiting its practical application and hindering widespread adoption.

[0077] In response to the above problems, the present application provides a battery system assembly method. This method can realize the connection of sampling lines from disordered to ordered by setting two welding pad groups, solving the technical problems of manual orderly installation and arrangement of sampling lines, which is tedious, time-consuming and error-prone.

[0078] This solution can be applied to the assembly process of the battery system. In order to facilitate the understanding of the embodiments of the present application, the battery system of the electric energy device provided by the present application is first described below. Figure 3 A schematic diagram of the structure of a battery system provided in this application Figure 1 ,like Figure 3 As shown, based on the existing battery system, the battery system provided by this application also includes: a connecting component 4.

[0079] The connection assembly 4 includes a first pad group 41 and a second pad group 42 insulated from each other. The first pad group 41 includes a plurality of first pads 43 insulated from each other; the second pad group 42 includes a plurality of second pads 44 insulated from each other.

[0080] It is understood that the connection component 4 is a structure for realizing electrical connection between the battery cell group 1 and the subsequent circuit or device, and it includes a first pad group 41 and a second pad group 42. The number of pads in the two pad groups and the arrangement and distribution of the pads can be set according to the layout of the circuit board, and this application does not limit this.

[0081] For example, the arrangement of the first pads 43 in the first pad group 41 can be longitudinal, transverse, or random. The specific arrangement can be changed according to the layout of the circuit board and is not limited in this application.

[0082] A pad is a metalized area on a circuit board used to solder electronic component pins. A pad group is a specific set of pads designed on a circuit board according to a specific layout and specifications, used to make electrical connections to other electronic components or wires. Each pad in a pad group has a specific number and function to facilitate identification and manipulation during circuit design and manufacturing.

[0083] The electrical connection between the cell group 1 and the pad group ensures that the sampling point can establish a reliable electrical connection with the subsequent circuit or equipment through the connection component 4, so that the voltage information of the cell group 1 can be accurately transmitted to the subsequent processing link.

[0084] At least two sampling points in the cell group 1 are electrically connected to the first pad 43 of the first pad group 41. The first pad 43 connected to the sampling point has a first arrangement number in the first pad group 41, which is independent of the second arrangement number of the sampling point in the cell group 1.

[0085] It should be understood that the first arrangement numbers have a regularity and can represent the physical arrangement order of the first pads 43 in the first pad group 41. The first arrangement numbers can be marked near the pads on the circuit board or not on the circuit board. The first arrangement numbers can be a set of numbers set manually or determined by setting a pad number arrangement rule. The number arrangement rule can, for example, arrange the pads in order from top to bottom and from left to right.

[0086] The second sequence number is determined based on the arrangement order of the sampling points in the battery cell group 1. For example, the second sequence number can be obtained by starting the numbering based on the direction of current flow, that is, from the positive electrode to the negative electrode of the battery cell group 1.

[0087] The sampling points are connected to the first pads 43 in the first pad group 41 in a random order, that is, the sampling points are randomly connected to the first pads 43. The random order mentioned here refers to inconsistent arrangement numbers. In other words, when connecting the sampling points to the first pads 43 in the first pad group 41, the assembler only needs to connect the sampling line corresponding to each sampling point to one first pad 43, without having to worry about which sampling point the sampling line is connected to or which first pad 43 it corresponds to. In other words, the first arrangement number of the first pad 43 connected to the sampling point in the first pad group 41 is unrelated to the second arrangement number of the sampling point in the battery cell group 1.

[0088] When connecting, you can select some sampling points to connect to the first pad group 41 according to the sampling requirements, or you can select all sampling points to connect to the first pad group 41. This application does not limit this. Selecting all sampling points to connect can detect the voltage of all battery modules in the battery group 1. Through the voltage value of each battery module in the battery group 1, the risk of overcharging / overdischarging of the battery module can be identified to ensure the safe operation of the battery system.

[0089] For example, Figure 4 A schematic diagram of the structure of a battery system provided in this application Figure 2 ,like Figure 4 As shown, assuming that the first pad group 41 includes 6 pads arranged in a row, the first arrangement sequence number is 1-6, and the first arrangement sequence number represents the physical order of the 6 pads in the first pad group 41. There are multiple sampling points in the battery cell group 1. Starting from the positive electrode of the battery pack, the second arrangement sequence number of the sampling point in the battery cell group 1 can be obtained, which is assumed to be AF. The sampling points are connected to the first pads 43 in a random order, that is, the two ends of the sampling line are randomly connected to any sampling point and any first pad 43. After the connection is completed, the following connection relationship can be obtained: the pad with sequence number 2 is connected to the sampling point with sequence number A, and the pad with sequence number 3 is connected to the sampling point with sequence number D. The first arrangement sequence number is independent of the second arrangement sequence number.

[0090] During the connection process, if the number of first solder pads 43 is equal to the number of selected sampling points, the selected sampling points and the first solder pads 43 are connected in random order to ensure that each sampling point is connected to a first solder pad 43; if the number of first solder pads 43 is greater than the number of selected sampling points, some first solder pads 43 can be randomly selected to be connected to the selected sampling points, and this application does not limit the positions of the selected solder pads; if the number of first solder pads 43 is less than the number of selected sampling points, multiple first solder pad groups 41 can be set in the circuit board, and the first solder pads 43 of the multiple first solder pad groups 41 are sorted to ensure that the number of first solder pads 43 is greater than or equal to the number of selected sampling points.

[0091] The electrical connection can be a wire connection, such as a sampling line. The connection between the sampling line and the first pad 43 can be, for example, welding, such as solder connection (such as tin soldering or silver soldering); adhesive curing connection, such as connection with conductive glue; mechanical compression connection, such as direct pressure welding, cold pressure welding, hot pressure welding, or other pressure welding methods; or energy-assisted welding, such as ultrasonic welding. This application does not limit this.

[0092] It is understandable that a double-ended wire solution can be used for sampling at the cell group 1 end. The wire is also the sampling line described in this application. The sampling point in the cell group 1 is electrically connected to the first pad 43 of the first pad group 41 in a disordered manner through the sampling line. That is, one end of the wire is connected to the sampling point of the cell group 1, and the other end is connected to the first pad 43, thereby implementing a double-ended wire solution. During the actual installation process, the assembler does not need to expend energy to strictly follow a specific order for connection operations, which greatly reduces the complexity and difficulty of installation and reduces the risk of installation errors due to incorrect sequence, thereby effectively improving installation efficiency and saving installation time and labor costs.

[0093] The first pad 43 connected to the sampling point is electrically connected to the second pad 44 of the second pad group 42 with the second arrangement number corresponding to the sampling point.

[0094] It can be understood that the second arrangement number is the correct order value of the sampling point in the battery cell group 1. For example, assuming that the second arrangement number of the sampling point is C, it means that the sampling point is the third sampling point in the battery cell group. At this time, the first pad connected to the sampling point is 6. At this time, the first pad with the first arrangement number 6 needs to be electrically connected to the second pad with the second arrangement number corresponding to the sampling point, that is, the second pad 3. Figure 4 As shown, assuming that the arrangement number of the second pad group 42 is one to six, one to six is ​​the physical order of the second pad group 42, and finally it is necessary to electrically connect the first pad 43 and the second pad group 42 according to the determined mapping relationship between the first arrangement number and the second arrangement number. This connection method can ensure that the voltage information collected in the second pad 44 can be accurately transmitted in the order of the battery cell module of the battery cell group 1.

[0095] Figure 5 This is a schematic diagram of the structure of a sampling line and battery system assembly provided in this application, such as Figure 5 As shown, the first pad group 41 and the second pad group 42 can be arranged on the same circuit board.

[0096] It is understandable that placing the first pad group 41 and the second pad group 42 on the same circuit board can reduce the number of circuit boards and save space. The same circuit board can also shorten the electrical path between the pad groups, reducing signal delay and loss. In this implementation, the circuit board needs to have space to accommodate the conversion connection of the sampling lines from disorder to order.

[0097] In addition, the first pad group 41 and the second pad group 42 may also be disposed on different circuit boards.

[0098] It is understood that by placing the first pad group 41 and the second pad group 42 on different circuit boards, the component layout on the circuit board can be more flexible and the impact between components can be reduced. At the same time, different circuit boards can be designed with independent routing according to their respective layout characteristics, and in the event of a circuit board failure, components can be repaired and replaced.

[0099] In specific implementation, the first pad group 41 and the second pad group 42 can be arranged on the same circuit board or on different circuit boards according to actual needs.

[0100] The battery management system also includes: a sampling unit;

[0101] The second pads 44 in the second pad group 42 are electrically connected to the terminals corresponding to the second arrangement number in the sampling unit.

[0102] The sampling unit is a module for obtaining status information of the battery cell group 1. For example, it can be the aforementioned AFE, MCU, and protection IC, or any other unit in the BMS that needs to detect the battery cell module voltage, without limitation.

[0103] The second pads 44 in the second pad group 42 are connected to the terminals of the sampling unit in order to transmit the voltage information of the cell group 1 to the sampling unit so that the sampling unit can collect, process and analyze the voltage information.

[0104] The sampling unit can be composed of different types of chips. Due to the different pinout designs of different chips, the required cell module sequence may also be different. The second pads 44 in the second pad group 42 correspond to the voltage information of each cell module in the cell group 1. During actual connection, the second pads 44 can be connected to the sampling unit according to the cell module sequence required by the sampling unit.

[0105] It is understandable that the specific connection method can adopt different methods according to actual needs, such as welding and plugging. Welding can firmly connect the second pad 44 and the sampling unit terminal together to ensure the reliability of the electrical connection; the plugging method can plug the two together through a dedicated connector, which is convenient for installation and removal. When connecting, it is necessary to strictly follow the correspondence between the second pad group 42 and the sampling unit terminal to ensure that each second pad 44 can be correctly connected to the corresponding sampling unit terminal. If the connection is incorrect, it may cause voltage information collection errors or even damage the sampling unit or battery pack 1.

[0106] The voltage information is sampled according to the arrangement order of the second pads 44 in the second pad group 42. The obtained voltage information order is the same as the order of the sampling points in the battery cell group 1, ensuring the accuracy and consistency of voltage information collection and facilitating subsequent data processing and analysis.

[0107] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0108] Figure 6 A schematic diagram of a battery system assembly method provided in this application is shown in FIG. Figure 6 As shown, the method includes:

[0109] S201 , electrically connecting at least two sampling points of the battery cell group to first pads respectively.

[0110] The first arrangement number of the first pad connected to the sampling point in the first pad group is irrelevant to the second arrangement number of the sampling point in the battery cell group.

[0111] For example, the electrical connection can be made using a sampling cable. A sampling cable is a conductor specifically designed to transmit electrical signals. It is made of metal or non-metallic materials and is typically flexible and small in diameter to facilitate routing within complex battery cell structures. The sampling cable can withstand the current and voltage generated by the battery cell during operation and has good insulation properties to prevent signal interference and short circuits.

[0112] A pad is a specific pad in a pad group. It serves as a signal input and output port, electrically interacting with other circuit components. The first pad is a port for receiving electrical signals from a sampling point of a cell group.

[0113] It is understood that during the connection process, the number of sampling points can be selected based on sampling requirements. Some sampling points can be selected to be connected to the first pad, or all sampling points can be selected. The principle of the method for electrically connecting some sampling points to the first pad is the same as the principle of the process for electrically connecting all sampling points to the first pad. The following embodiments are explained by exemplifying the selection of all sampling points.

[0114] Disordered electrical connection refers to a method of electrical connection that is not arranged in a fixed order. It adopts a flexible connection method, which only requires ensuring that each selected sampling point has a sampling line connected to the first pad. During the connection process, it is necessary to ensure that the connection is firm and reliable, and the contact resistance is small to ensure the normal transmission of the signal. Disordered electrical connection is not strictly restricted by spatial layout. Even in complex scenarios with a large number of sampling points, the connection of the sampling lines can still be completed quickly and efficiently. For example, in some battery systems with compact space and complex structure, the traditional ordered connection method may be difficult to implement due to the small space, while the disordered electrical connection can easily cope with it with its flexibility, greatly improving the feasibility and efficiency of the connection.

[0115] Using a random electrical connection method can significantly accelerate the assembly process of battery systems. Traditional, ordered connection methods require a significant investment of time to lay out the sampling lines. This process not only requires accurate matching of each sampling point with the corresponding pad, but also ensures the rationality and stability of the sampling line connections. Random electrical connections, however, simplify the assembly process, reduce difficulty, and enable faster and more efficient assembly.

[0116] S202 , measuring the voltage value at each first pad.

[0117] It is understandable that due to the disordered connection between the sampling line and the first pad, the voltage information transmitted by the sampling line is also disordered and cannot be directly transmitted to the battery management system. The disordered voltage sequence needs to be sorted. Therefore, a voltage measuring device is used to measure the voltage value at the first pad. During the measurement, it is necessary to determine the pad serial number corresponding to the positive pole of the battery cell group or the negative pole of the battery cell group, and use the determined pad as the reference pad to complete the voltage measurement together with other pads. For example, if the positive pole of the battery cell group is selected as the reference pad, it is necessary to determine the serial number of the first pad connected to the sampling point in the first pad group based on the sampling line on the positive pole sampling point of the battery cell group.

[0118] The voltage measuring device may be, for example, a multimeter, a voltmeter, or the like.

[0119] By measuring the voltage value at the first pad and sorting according to the measured voltage values, the position of the sampling point connected to each pad in the battery cell group can be determined according to the sorting result.

[0120] Furthermore, the voltage value can be used to determine if errors exist in the circuit portion connected to the pad, allowing assembly personnel to promptly identify potential circuit issues and take appropriate maintenance measures to ensure the safety of electrical equipment. For example, an abnormal voltage value may indicate damage to the battery module. If the voltage values ​​are equal, there may be an issue with two sampling lines connected to the same sampling point. If no voltage value is detected at a pad, there may be an error in the connection between the pad and the sampling line, or the connection between the sampling line and the sampling point of the battery pack.

[0121] S203 : Determine a mapping relationship between the first arrangement number and the second arrangement number based on the voltage value at each first pad soldering point.

[0122] It can be understood that each first pad is connected to a sampling point corresponding to a cell module at a different position in the cell group. By measuring the voltage value at each first pad, the order of the sampling points connected to these pads can be determined from the beginning to the end of the cell group. In other words, it is clear which cell module in the cell group each pad corresponds to. Because the cell modules in the cell group are connected in series, according to the characteristics of the series circuit, the voltage will increase sequentially along the cell group. Therefore, the order of the sampling points corresponding to the first pads can be determined.

[0123] During the use of the battery pack, this sequence can help the battery management system understand the status of each battery module. When a fault occurs in the battery pack, such as abnormal voltage in a battery module, the position of the faulty battery module can be quickly and accurately located, which is critical for timely maintenance and ensuring the safe operation of the battery pack.

[0124] Specifically, the mapping relationship between the first arrangement number and the second arrangement number may be determined based on the voltage value at the first pad.

[0125] It can be understood that the first arrangement number is the arrangement number of the first pad in the first pad group, which represents the number of pads and the specific position of the pad. The second arrangement number represents the arrangement number of the sampling point in the battery cell group. Because the sampling point is connected to the first pad in a disorderly order, the voltage information measured at the first pad and the voltage information of the battery cell module of the battery cell group are also disordered. By determining the mapping relationship between the first arrangement number and the second arrangement number, the order of the sampling points finally connected to the second pad group can be correct.

[0126] First, based on the voltage value at each first pad and the reference voltage of the battery cell group, the second arrangement number corresponding to each first pad can be determined.

[0127] The reference voltage may be an average value of the voltages at the first pads, or a voltage corresponding to a reference point, and the reference point may be any one of the first pads connected to the sampling point.

[0128] One possible implementation method is that when the reference voltage is the average value of the voltage at the first pad, in the battery cell group, due to the differences in battery cell modules, measurement differences, etc., the performance of each battery cell module may vary to a certain extent. Selecting the average value as the reference voltage can eliminate the impact of these individual differences to a certain extent, making the sorting results more representative and accurate. For example, if the measured voltage value of a battery cell module is high due to fluctuations in the detection environment temperature, while the measured voltage value of another battery cell module is low, using the voltage of a single battery cell module as a reference may cause deviations in the sorting results. The average value can comprehensively reflect the overall voltage level of the entire battery cell group. As a relatively stable statistical value, it can eliminate some accidental voltage fluctuations and improve the stability of the sorting.

[0129] When sorting, the voltage value at each first pad can be subtracted from the voltage value at the reference point to obtain the difference between the voltage of each pad and the voltage value of the reference point. Then, based on the voltage difference and the reference voltage, that is, the average value of the voltage at the first pad, the quotient of the voltage difference and the reference voltage is obtained, and the first pads are sorted according to the size of the quotient. The larger the quotient is positive and the greater the absolute value, the higher the voltage of the battery cell module corresponding to the pad, and the closer its position in the battery cell group may be to the positive pole of the battery cell group. In this way, the order of the sampling points connected to each first pad in the battery cell group can be determined, that is, the second arrangement number.

[0130] For example, let's assume a battery module includes a single cell. Assume the first pads are numbered 1-6, and the first pad connected to the sampling point on the positive side of the cell group is used as the reference pad. Assuming that the assembly personnel manually confirm that the sampling point on the positive side of the cell group is connected to pad numbered 2 in the first pad group via a sampling line, the reference pad is numbered 2. Using pad numbered 2 as the reference, the voltages measured at the remaining first pads 1, 3-6 are 14.3V, 10V, 18.1V, 3V, and 6V, respectively. Since the cells in the cell group are connected in series, the voltages increase sequentially. Therefore, the maximum voltage of 18.1V is the voltage measured between the pad corresponding to the sampling point on the negative side of the cell group and the reference pad, meaning that 18.1V is the total voltage of the cell group. Therefore, the average voltage corresponding to the first pads, or the reference voltage, is calculated to be 18.1 / 5 = 3.62V. The pad with a voltage of 3V is selected as the reference point.

[0131] The voltage difference of the first pad numbered 1 is 11.3V, and the quotient is 3.1. Since the quotient is a positive value, it means that the first pad numbered 1 is after the reference point, and is the third one after the reference point.

[0132] The voltage difference of the first pad numbered 3 is 7V, and the quotient is 1.9. Since the quotient is a positive value, it means that the first pad numbered 3 is behind the reference point and is the second one after the reference point.

[0133] The voltage difference of the first pad numbered 4 is 15.1V, and the quotient is 4.2. Since the quotient is a positive value, it means that the first pad numbered 4 is after the reference point, and is the fourth pad after the reference point.

[0134] The voltage difference of the first pad numbered 5 is 0, and the first pad numbered 5 is used as a reference point, and all first pads are arranged sequentially with the first pad 5 as the reference point.

[0135] The voltage difference of the first pad numbered 6 is 3V, and the quotient is 0.8. Since the quotient is a positive value, it means that the first pad numbered 6 is behind the reference point and is the first one after the reference point.

[0136] In summary, because the assembler has manually determined that the first pad connected to the sampling point on the positive side of the battery cell group is numbered 2, the pad numbered 2 should be ranked first. Based on the above calculations, the second arrangement number corresponding to the first pad is 256314.

[0137] In another possible implementation, when the reference voltage is a voltage corresponding to a reference point, the reference point may be any first pad.

[0138] A voltage difference between a voltage value at the first pad and a voltage value at a reference point is obtained.

[0139] The first pads in the first pad group are sorted based on the quotient of the voltage difference corresponding to the first pad and the reference voltage to obtain a second arrangement order corresponding to each first pad.

[0140] It is understandable that the voltage is distributed along the cell group in sequence. No matter which voltage value at the first pad is selected as the reference voltage, the relative voltage relationship between the pads will not change. The sampling points can be sorted based on this relative voltage relationship.

[0141] During the sorting process, a random reference voltage is selected from all measured voltage values ​​at the first pad. The difference between the voltage value at each pad and the reference voltage is determined. The voltage difference for each pad is divided by the reference voltage; the resulting quotient reflects the relative position of the pad voltage relative to the reference voltage. The larger the absolute value of the quotient, the greater the deviation of the cell voltage corresponding to that pad from the reference voltage, and the more likely it is located at either end of the cell stack. A positive quotient indicates that the voltage is behind the reference voltage (voltages are sorted from highest to lowest), while a negative quotient indicates that the voltage is ahead of the reference voltage.

[0142] For example, taking a battery cell module including one battery cell, assuming the first pads are numbered 1-6, the first pad connected to the sampling point on the positive side of the battery cell group is used as the reference pad, and assuming that the assembly personnel manually confirm that the sampling point on the positive side of the battery cell group is connected to the pad numbered 2 in the first pad group via a sampling line, the reference pad is numbered 2. Taking pad numbered 2 as the reference, the voltage values ​​measured at the remaining first pads 1, 3-6 are 14.3V, 10V, 18.1V, 3V, and 6V, respectively. At the same time, the pad with a voltage value of 10V is selected as the reference point, and the corresponding reference voltage can be 10V.

[0143] The voltage difference of the first pad numbered 1 is 4.3V, and the quotient is 1.4. Since the quotient is a positive value, it means that the first pad numbered 1 is behind the reference point, and is the first one after the reference point.

[0144] The voltage difference of the first pad numbered 3 is 0, and the first pad numbered 3 is used as a reference point, and all first pads are arranged sequentially based on the first pad 3.

[0145] The voltage difference of the first pad numbered 4 is 8.1V, and the quotient is 2.7. Since the quotient is a positive value, it means that the first pad numbered 4 is behind the reference point, and is the third one after the reference point.

[0146] The voltage difference of the first pad numbered 5 is -7, and the quotient is -2.3. Since the quotient is a negative value, it means that the first pad numbered 5 is before the reference point, and is the second one before the reference point.

[0147] The voltage difference of the first pad numbered 6 is -4V, and the quotient is -1.3. Since the quotient is a positive value, it means that the first pad numbered 6 is after the reference point and is the first one before the reference point.

[0148] In summary, because the assembler has manually determined that the first pad connected to the sampling point on the positive side of the battery cell group is numbered 2, the pad numbered 2 should be ranked first. Based on the above calculations, the second arrangement number corresponding to the first pad is 256314.

[0149] After the second arrangement number is determined, a mapping relationship may be determined based on the first arrangement number of each first pad in the first pad group and the corresponding second arrangement number.

[0150] It can be understood that the mapping relationship determines how the first pad in the first pad group is connected to the second pad in the second pad group. By connecting according to the mapping relationship, the voltage measured at the subsequent second pad can correctly correspond to the cell voltage sequence of the cell group.

[0151] S204 : According to the mapping relationship, electrically connect the first pad connected to the sampling point to each second pad in the second pad group corresponding to the second arrangement number.

[0152] It is understood that when the first pad is connected to the second pad, the connection order is not directly based on the physical location, but rather is connected according to the sampling point sorting rules. Each pad has a specific identifier (such as a label) at its physical location to facilitate identification and operation. The order of the pad labels in the second pad group is consistent with the order of the pad labels in the first pad group, and will not be repeated here.

[0153] It should be noted that the corresponding relationship between the arrangement order of the second pads in the second pad group and the second arrangement number is known, that is, under normal circumstances, the arrangement order of the second pads is the second arrangement number of the sampling point in the battery cell group. Figure 4 , sampling point A corresponds to the second pad 1, sampling point B corresponds to the second pad 2, and so on, obtaining the mapping relationship between the first arrangement number and the second arrangement number, that is, obtaining the connection relationship between the first pad and the second pad. It should be noted that the second pad is usually connected to the sampling unit. When the second pad does not correspond to the second arrangement number of the sampling point, when connecting the first pad and the second pad, the jumper device can store the correspondence between the second pad and the second arrangement number, and use this correspondence to connect the first pad and the second pad.

[0154] For example, Figure 4 As shown, based on the numerical values ​​in the above example, it can be obtained that the first arrangement number is 1-6, and after calculation, the second arrangement number actually corresponding to the first arrangement number is 256314. That is, the mapping relationship indicates that the pad with the first arrangement number 2 is connected to the pad with the arrangement number 1 in the second pad group; the pad with the first arrangement number 5 is connected to the pad with the arrangement number 2 in the second pad group; the pad with the first arrangement number 6 is connected to the pad with the arrangement number 3 in the second pad group; the pad with the first arrangement number 3 is connected to the pad with the arrangement number 4 in the second pad group; the pad with the first arrangement number 1 is connected to the pad with the arrangement number 5 in the second pad group; and the pad with the first arrangement number 4 is connected to the pad with the arrangement number 6 in the second pad group.

[0155] In a possible implementation, when electrically connecting the first pad to the second pad, a jumper device may be used to connect the first pad to the second pad.

[0156] For example, the mapping relationship is input into the jumper device; the jumper device is controlled to electrically connect the first pad connected to the sampling point with the second pad corresponding to the second arrangement number in the second pad group according to the mapping relationship.

[0157] A jumper device is a tool used to achieve electrical connections. It can electrically connect different electrical nodes (such as the first and second pads in this embodiment) through flexible connection methods. In actual applications, jumpers may take various forms, such as jumper caps, jumper clips, and jumper strips, enabling them to quickly and accurately establish or disconnect electrical connections based on actual needs.

[0158] As will be appreciated, the determined mapping relationship is input into the jumper device. The input method may vary depending on the jumper device type. For example, with simple jumper devices, the connection pins may need to be manually set; with intelligent jumper devices, the sorting information can be entered through a software interface. The jumper device selection requires that the jumper device be able to identify the positions of the first and second pads. This can be achieved through identification on the pads (such as numbering, color, etc.) or by locating them relative to other components on the circuit board.

[0159] Based on the input sampling point sorting information, the jumper device electrically connects the first pad connected to the sampling point to the second pad in the second pad group according to the corresponding position. The connection method may include physical contact (such as plugging and unplugging a jumper cap) or electromagnetic coupling (such as a wireless jumper device).

[0160] In another possible implementation, when electrically connecting the first pad to the second pad, a manual jumper may be used to connect the first pad to the second pad.

[0161] The battery system assembly method provided in the embodiment of the present application electrically connects the sampling points of the battery cell group with the first pad of the first pad group in a disordered manner through the sampling line. There is no need to pre-plan the connection order, and the wiring can be completed quickly. After the connection is completed, the voltage value at the first pad is measured. Based on the measured voltage value, the order of the sampling points connected to each first pad is determined. According to the sorting result, the first pad is electrically connected to the second pad at the corresponding position in the second pad group through a connector, so that the connection order of the sampling lines in the second pad group corresponds to the actual arrangement order of the sampling points of the battery cell group, thereby realizing the orderly connection of the sampling lines. This method effectively avoids the tedious sorting steps in traditional manual wiring through voltage measurement and sorting, significantly improves the efficiency of sampling line installation, and reduces the risk of connection errors due to human errors.

[0162] Compared to existing solutions that use automated equipment to install battery sampling lines, the voltage measurement equipment used in this application has lower purchase and maintenance costs, a user-friendly interface, and allows assembly personnel to quickly get started without complex training. Furthermore, the solution's flexible matching mechanism between the cell pack and the solder pads allows it to adapt to cell pack structures of varying specifications and sizes, eliminating the need for customized equipment for specific models. This significantly improves the solution's versatility and scalability.

[0163] In some embodiments, the first solder pad 43 of the battery system proposed in this application includes: a first sub-pad 45 and a second sub-pad 46. Figure 7 A schematic diagram of the structure of a battery system provided in this application Figure 3 ,like Figure 7 The first sub-pad 45 is electrically connected to the second sub-pad 46 .

[0164] It is understandable that a new group of pads, namely second sub-pads 46, can be added to the first pad group 41. The number of second sub-pads 46 and the arrangement of first sub-pads 45 can be the same. Similarly, the second sub-pads 46 can also be distinguished by numbers, colors, etc. The second sub-pads 46 are connected to the first sub-pads 45 in a corresponding physical position, that is, the first sub-pad 45 with the number 1 is electrically connected to the second sub-pad 46 with the number 1.

[0165] The physical position of the second sub-pad 46 on the circuit board can be adjacent to the first sub-pad 45 and will not interfere with other components. In this case, the first sub-pad 45 and the second sub-pad 46 can be directly connected through the copper foil on the circuit board. This connection method is simple, reliable and low-cost. By setting adjacent second sub-pads 46 and connecting them, it can be used as a starting pad for the sampling line to go from disordered to ordered, that is, the first sub-pad 45 in the first pad group 41 is the starting point of the disordered connection of the sampling line, and the second sub-pad 46 is the end point of the disordered connection of the sampling line, and is also the starting point of the ordered connection of the sampling line. The setting of the second sub-pad 46 can effectively distinguish between the ordered and disordered states of the sampling line, and intuitively present the conversion process of voltage information from disordered to ordered. At the same time, this design ensures that the connection points of the disordered sampling line and the ordered sampling line are not concentrated on the same pad, making the connection relationship of the sampling points clearer.

[0166] After the second sub-pad 46 is introduced, the first sub-pad 45 and the second sub-pad 46 can be connected in a fixed manner first, and then the second sub-pad 46 and the second pad 44 can be flexibly connected according to the second arrangement sequence. In this way, during subsequent circuit modification or maintenance, if the connection sequence of the sampling points needs to be adjusted, only the connection between the second sub-pad 46 and the second pad 44 needs to be modified, thereby improving the flexibility and maintainability of the wiring.

[0167] According to the order of the sampling points connected to the first sub-pads 45 , the second sub-pads 46 are electrically connected to the second pads 44 at corresponding positions in the second pad group.

[0168] It can be understood that the first sub-pad 45 is connected to the second sub-pad 46 in a corresponding manner, that is, the voltage information at the second sub-pad 46 is the same as the voltage information of the second sub-pad 46. After the voltage is measured and sorted, the second sub-pad 46 can be connected to the second pad 44 according to the determined sampling point sequence. The connection method is the same as the connection method of the first pad 43 and the second pad 44 in the aforementioned embodiment.

[0169] It should be noted that the external packaging structures of the first pad group 41 and the second pad group 42 can take various forms, including but not limited to plug-shaped, connector-shaped, surface-mount, pin-shaped, and flexible circuit board connectors. The specific form should be determined based on the application scenario, functional requirements, and manufacturing process to meet requirements such as electrical connection and signal transmission. This application does not impose any restrictions on this. During the design process, it is necessary to ensure that the packaging structure is compatible with the circuit board design, manufacturing process, and assembly process.

[0170] In summary, the present application provides a battery system assembly method, which adds two pad groups. During assembly, at least two sampling points of the battery cell group are connected to the pads of the first pad group in a disordered manner. Subsequently, the voltage information of the first pad group is collected and sorted to determine the second arrangement order. Then, with the help of a jumper device, the first pad group and the second pad group are jumpered according to the mapping relationship between the determined first arrangement order and the second arrangement order, thereby ensuring that the voltage information of the second pad group is consistent with the order of the sampling points of the battery cell group, solving the technical problem of tedious and time-consuming orderly installation of the sampling lines. The accuracy and efficiency of the sampling line connection of the battery system are improved.

[0171] The present application provides an electric energy device, which includes the battery system described above. The electric energy device described herein may be, for example, a vehicle, such as a car or a ship, or may be a medical device or experimental equipment, without limitation.

[0172] Finally, it should be noted that those skilled in the art will readily identify other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The present invention is not limited to the precise structure described above and illustrated in the accompanying drawings, and various modifications and variations may be made without departing from the scope thereof. The scope of the present invention is limited solely by the appended claims.

Claims

1. A battery system, characterized in that: The battery system comprises: A battery cell group, wherein the battery cell modules in the battery cell group are connected in series; A connecting component, the connecting component comprising a first pad group and a second pad group insulated from each other; the first pad group comprises a plurality of first pads insulated from each other; the second pad group comprises a plurality of second pads insulated from each other; At least two sampling points in the battery cell group are electrically connected to the first pads, respectively, wherein the first pads connected to the sampling points have a first arrangement number in the first pad group, which is independent of the second arrangement number of the sampling points in the battery cell group; The first pad connected to the sampling point is electrically connected to each of the second pads corresponding to the second arrangement number in the second pad group.

2. The battery system according to claim 1, wherein: The first pad includes: a first sub-pad and a second sub-pad, wherein the first sub-pad is electrically connected to the second sub-pad; At least two of the sampling points in the cell group are electrically connected to the first sub-pad of the first pad; The second sub-pad of the first pad connected to the sampling point is electrically connected to the second pad of the second pad group with the second arrangement number corresponding to the sampling point.

3. The battery system according to claim 1, wherein: The first pad group and the second pad group are both arranged on the same circuit board.

4. The battery system according to claim 1, wherein: The battery system further comprises: a battery management system, wherein the battery management system comprises: a sampling unit; The second pads in the second pad group are electrically connected to the terminals in the sampling unit corresponding to the second arrangement number.

5. The battery system according to claim 4, characterized in that The sampling unit includes at least any one of the following: Analog front-end unit, control unit, protection integrated unit.

6. The battery system according to claim 1, wherein: The sampling points of the battery cell group include: at least two of: a sampling point located at the positive pole of the first battery cell module, a sampling point located on the connection line of the adjacent battery cell modules, and a sampling point located at the negative pole of the last battery cell module.

7. An electric energy device, characterized in that: The electric energy device comprises the battery system according to any one of claims 1 to 6.

8. A battery system assembly method, characterized in that: The battery system includes a cell group and a connection component, wherein a plurality of cell modules in the cell group are connected in series; The sampling points of the battery cell group include: a sampling point located at the positive electrode of the first battery cell module, a sampling point located on the connection line of the adjacent battery cell modules, and a sampling point located at the negative electrode of the last battery cell module; The connection assembly includes a first pad group and a second pad group insulated from each other; the first pad group includes a plurality of first pads insulated from each other; the second pad group includes a plurality of second pads insulated from each other; The method comprises: Electrically connecting at least two sampling points of the battery cell group to the first pads, respectively, wherein the first pads to which the sampling points are connected have a first arrangement number in the first pad group that is independent of a second arrangement number of the sampling points in the battery cell group; measuring the voltage value at each of the first pads; Determining a mapping relationship between the first arrangement number and the second arrangement number based on a voltage value at each of the first pads; According to the mapping relationship, the first pad connected to the sampling point is electrically connected to each of the second pads in the second pad group corresponding to the second arrangement number.

9. The method according to claim 8, characterized in that The determining, based on the voltage value at each of the first pads, a mapping relationship between the first arrangement number and the second arrangement number includes: Determining the second arrangement sequence number corresponding to each first soldering pad based on the voltage value at each first soldering pad and the reference voltage of the battery cell group; The mapping relationship is determined based on the first arrangement sequence number of each of the first pads in the first pad group and the corresponding second arrangement sequence number.

10. The method according to claim 9, characterized in that The determining, based on the voltage value at each of the first pads and a reference voltage, the second arrangement number corresponding to each of the first pads includes: Obtaining a voltage difference between a voltage value at each of the first pads and a voltage value at a reference point; sorting the first pads based on a quotient of a voltage difference corresponding to each of the first pads and a reference voltage; The second arrangement sequence number corresponding to each first pad is determined based on the sorting position of each first pad.

11. The method according to claim 8, characterized in that The method further comprises: The reference voltage of the battery cell group is determined based on an average value of the voltages at the first pads.

12. The method according to any one of claims 8 to 11, characterized in that The first pad includes: a first sub-pad and a second sub-pad, wherein the first sub-pad is electrically connected to the second sub-pad; The step of electrically connecting the at least two sampling points of the battery cell group to the first pads respectively includes: electrically connecting at least two sampling points of the battery cell group to the first sub-pad of the first pad respectively; The step of electrically connecting the first pad connected to the sampling point with each of the second pads in the second pad group corresponding to the second arrangement number according to the mapping relationship includes: According to the mapping relationship, the second sub-pad of the first pad connected to the sampling point is electrically connected to each of the second pads corresponding to the second arrangement number in the second pad group.

13. The method according to any one of claims 8 to 11, characterized in that: The step of electrically connecting the first pad connected to the sampling point with each of the second pads in the second pad group corresponding to the second arrangement number according to the mapping relationship includes: inputting the mapping relationship into a jumper device; The jumper device is controlled to electrically connect the first pad connected to the sampling point with each of the second pads corresponding to the second arrangement number in the second pad group according to the mapping relationship.

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