Battery module with detection device

Abstract

The utility model discloses a battery module with a detection device. The battery module comprises a plurality of battery monomers and the detection device, the number of the detection devices is equal to that of the single batteries, each detection device comprises a circuit board, a detection assembly and a wireless connection unit, the detection assembly comprises an internal resistance detection element, a temperature detection element and a pressure detection element, the wireless connection unit is electrically connected with the detection assembly through the circuit board, and the detection assembly transmits signals through the wireless connection unit. Wherein the detection assembly of one detection device further comprises a gas detection element. The internal resistance, the temperature and the pressure of each battery monomer are detected through the detection assembly, and only one detection device is required to be provided with the gas detection element to detect the whole battery module, so that the structure of the detection device is simplified. Wireless connection is achieved through the wireless connection unit, extra wires or wire harnesses do not need to be arranged, the overall size and weight of the battery module are reduced, and safety risks caused by too many wires or wire harnesses are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery detection equipment, in particular to a battery module with a detection device. Background Technique

[0002] With the development of new energy, as an integrated electric energy storage device, the battery module has been widely used in the fields of new energy vehicles, energy storage systems, etc. In order to increase the total capacity of the battery module, both the number of battery cells and the energy density of the battery cells need to be increased, which will cause serious accidents such as combustion and explosion of the battery module during use. In order to ensure the safety of the battery module, monitoring the state of the battery module is one of the effective methods.

[0003] In the prior art, the temperature and pressure of the battery cells are detected by detection elements, and these detection elements transmit signals to the battery management system through wires or wire harnesses. However, with the increase in the number of battery cells, in order to independently detect each battery cell, the number of wires or wire harnesses increases sharply. On the one hand, multiple wires or wire harnesses will occupy space, reducing the energy density of the battery cells, and the reliability of the battery module is reduced due to the loosening of the connections of the wires or wire harnesses. On the other hand, the wiring of multiple wires or wire harnesses is complex, which also increases the assembly complexity, and the use of a large number of wires or wire harnesses also increases the production cost. In addition, only detecting the temperature and pressure of the battery cells can no longer meet the complex use environment of the current battery cells. When the temperature and pressure of the battery cells change, reactions may have already occurred inside the battery cells, and the abnormalities of the battery cells cannot be detected in time, which will greatly increase the probability of combustion or explosion of the battery cells.

[0004] Therefore, the existing battery modules need to be improved. Summary of the Invention

[0005] The purpose of the utility model is to provide a battery module with a detection device, which can not only detect the internal resistance, temperature and pressure of the battery cells, but also the gas detection element can detect the whole battery module, simplifying the structure of the detection device. Moreover, the wireless connection unit communicates with the battery management system, eliminating the need for additional wires or wire harnesses, reducing the space occupied by the detection device, thereby increasing the energy density of the battery cells, improving the communication stability with the battery management system, and reducing the complexity of the assembly process and the production cost.

[0006] The purpose of the utility model is achieved by the following technical solutions:

[0007] A battery module with a detection device, comprising:

[0008] A plurality of battery cells, arranged in sequence.

[0009] Detection device, the number of the detection devices being equal to the number of the battery cells, and one of the detection devices being used to detect one of the battery cells. Each of the detection devices includes a circuit board, a detection component and a wireless connection unit disposed on the circuit board. The circuit board is used to be electrically connected to the positive electrode and the negative electrode of a single battery cell and powered by the battery cell. The detection component includes an internal resistance detection element, a temperature detection element and a pressure detection element. The internal resistance detection element is used to detect the internal resistance of the battery cell. The temperature detection element is used to detect the temperature of the battery cell. The pressure detection element is used to detect the pressure of a single battery cell. The wireless connection unit is electrically connected to the detection component through the circuit board, and the detection component transmits signals through the wireless connection unit;

[0010] Wherein, the detection component of one of the detection devices further includes a gas detection element, and the gas detection element is used to detect whether the battery module leaks hydrogen and / or carbon monoxide.

[0011] Preferably, each of the detection devices is respectively disposed outside a single battery cell or embedded in a single battery cell.

[0012] Preferably, the temperature detection element is a temperature-sensitive chip;

[0013] The pressure detection element is one or more of a piezoelectric pressure sensor, an elastic membrane pressure sensor, a capacitance pressure sensor, a strain pressure sensor, a volumetric pressure sensor, and a piezoresistive pressure sensor;

[0014] The gas detection element is one or more of a thermal conductivity sensor, an electrical conductivity sensor, an optical fiber sensor, and an electrochemical sensor;

[0015] The wireless connection unit is one of a Bluetooth connection unit, a radio frequency connection unit, a ZigBee connection unit, and a WiFi connection unit.

[0016] Preferably, the circuit board has a first surface and a second surface disposed along the thickness direction, and a plurality of circuits are disposed on the circuit board, and the circuits are disposed on the first surface of the circuit board; and / or,

[0017] The circuits are disposed on the second surface of the circuit board; and / or,

[0018] The circuits are buried in the circuit board.

[0019] Preferably, a bus bar is further included. The bus bar includes a connecting bar and a wiring bar. The connecting bar is used to connect a plurality of the battery cells in series, parallel or in a hybrid connection. The wiring bar is used to connect the positive or negative electrode of a single battery cell. The circuit board of the detection device is connected to the bus bar and is electrically connected to the positive and negative electrodes of a single battery cell through the bus bar.

[0020] Preferably, the temperature detection element is disposed on the first surface of the circuit board, and the second surface of the circuit board is disposed on the bus bar;

[0021] A heat conducting member is disposed between the temperature detection element and the bus bar. One side of the heat conducting member is in contact with the bus bar, and the other side of the heat conducting member is in contact with the temperature detection element; and / or,

[0022] When a pressure relief valve is provided on the battery cell, the pressure detection element is disposed above the pressure relief valve or near the pressure relief valve.

[0023] Preferably, a first isolation plate is further included. The first isolation plate is disposed between the bus bar and the battery cell.

[0024] Preferably, a first hollow portion is provided on the first isolation plate. The bus bar is electrically connected to the battery cell through the first hollow portion; and / or,

[0025] A second hollow portion is provided on the first isolation plate. The side of the pressure detection element facing the battery cell is exposed from the second hollow portion; and / or,

[0026] A third hollow portion is provided on the first isolation plate. The side of the gas detection element facing the battery cell is exposed from the third hollow portion.

[0027] Preferably, a second isolation plate is further included. The second isolation plate is disposed above the bus bar and the circuit board.

[0028] Preferably, a convex portion is provided on the bus bar, and a fourth hollow portion is provided on the second isolation plate. The convex portion is exposed from the fourth hollow portion; and / or,

[0029] A fifth hollow portion is provided on the second isolation plate. The internal resistance detection element is exposed from the fifth hollow portion; and / or,

[0030] A sixth hollow portion is provided on the second isolation plate. The temperature detection element is exposed from the sixth hollow portion; and / or,

[0031] A seventh hollow portion is provided on the second isolation plate. The pressure detection element is exposed from the seventh hollow portion; and / or,

[0032] An eighth hollow portion is provided on the second partition board, and the gas detection element is exposed from the eighth hollow portion; and / or,

[0033] A ninth hollow portion is provided on the second partition board, and the wireless connection unit is exposed from the ninth hollow portion.

[0034] Compared with the prior art, the beneficial effects of the present utility model at least include:

[0035] For the battery module with a detection device of the present utility model, the internal resistance detection element, temperature detection element and pressure detection element of each detection device are used to detect the internal resistance, temperature and pressure of each battery cell. Only one detection device is required to be provided with a gas detection element to detect the entire battery module, and it is not necessary to provide a gas detection element for each detection device, which simplifies the structure of the detection device. By wirelessly connecting with the battery management system through the wireless connection unit, there is no need to additionally provide wires or wire harnesses, reducing the space occupied by the detection device, thereby increasing the energy density of the battery cell, simplifying the structure of the battery module, reducing the overall volume and weight of the battery module, and reducing the safety risks brought by excessive wires or wire harnesses, avoiding problems such as loosening and damage of wires or wire harnesses. At the same time, the stability of communication with the battery management system is improved, thereby extending the service life of the detection device and improving the stability of communication with the battery management system, further improving the safety, reliability and stability of the battery module, and reducing the complexity of the assembly process and production cost. At the same time, one detection device is correspondingly provided for each battery cell, which not only avoids the mutual influence between detection devices, greatly improves the accuracy of detection and the accurate positioning of faulty battery cells, but also makes the splicing of battery cells more flexible, and is also conducive to the replacement and maintenance of detection devices. Description of the Drawings

[0036] Figure 1 is an exploded schematic view of the battery module according to an embodiment of the present utility model.

[0037] Figure 2 is a schematic structural view of the battery module according to an embodiment of the present utility model.

[0038] Figure 3 is a schematic view of the connection between a detection device and a battery cell in an embodiment of the present utility model.

[0039] Figure 4 is another schematic view of the connection between a detection device and a battery cell in an embodiment of the present utility model.

[0040] In the figure: 100, battery module; 1, battery cell; 11, positive electrode; 12, negative electrode; 13, pressure relief valve; 2, detection device; 21, circuit board; 211, circuit; 212, first surface; 22, detection component; 221, internal resistance detection element; 222, temperature detection element; 223, pressure detection element; 224, gas detection element; 23, wireless connection unit; 3, bus bar; 31, connection bar; 311, protrusion; 32, connection terminal; 321, connection hole; 4, first separator; 41, first hollow part; 42, second hollow part; 43, third hollow part; 5, second separator; 51, fourth hollow part; 52, fifth hollow part; 53, sixth hollow part; 54, seventh hollow part; 55, eighth hollow part; 56, ninth hollow part; 6, fixing hole. Detailed implementation manners

[0041] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this utility model will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their repetitive description will be omitted.

[0042] In the present utility model, the words expressing position and direction are described by taking the accompanying drawings as examples, but can be changed as needed, and all the changes made are included in the protection scope of the present utility model.

[0043] Referring to Figures 1 to 4, the present utility model provides a battery module 100 with a detection device, which includes a plurality of battery cells 1 and a plurality of detection devices 2. The number of battery cells 1 is the same as that of the detection devices 2, and one detection device 2 is arranged on each battery cell 1, that is, each detection device 2 is only used to detect one battery cell 1. The detection device 2 of the present application can also be used in the WIBS (Wireless Individual Battery System). WIBS refers to integrating and collecting data of the CCS (Cell Contact System, busbar 3) of the battery cell 1, and real-time monitoring of the voltage, temperature, internal resistance, SOC (State of Charge), SOH (State of Health), and leakage current information of the battery cell 1. It has high-speed communication and pre-control response capabilities, and conducts big data management on the entire life cycle of the battery; it real-time monitors and predicts the operating condition trend of the battery cell 1 (battery cluster), establishes a battery individual safety system SOS, and real-time updates the safe operation of the energy storage system. The battery state calculation technology adopts a new algorithm, which has the characteristics of self-learning and neural network models, can adapt to various types of batteries, real-time learn battery parameters, takes the safety state of the battery as an evaluation parameter of the battery, and greatly improves the safety and cycle life of the battery system (delay attenuation); it collaborates with the R & D of wireless PACK and scales the front-end acquisition and active balancing chips of the battery management system, creating a complete energy storage technology ecosystem from the battery cell 1, BMS chips, to the BMS application system, to energy storage data aggregation, diagnosis and analysis, value mining and data empowerment, to grid access to realize the energy storage value. WIBS adopts the battery cell 1 / battery full life cycle management system and uses big data adaptive algorithms to real-time control the energy ratio.

[0044] Specifically, there are various types of battery cells 1, including but not limited to: lithium-ion batteries, nickel-metal hydride batteries, lead-acid batteries, supercapacitors, sodium-ion batteries, lithium polymer batteries, lithium-sulfur batteries, and metal-air batteries, etc. In this embodiment, the battery cell 1 can be any one of the batteries. The plurality of battery cells 1 are arranged in sequence, and there are various arrangement methods of the battery cells 1, such as: linear arrangement, square arrangement, honeycomb arrangement, and multi-layer stacking arrangement, etc., which can be arranged according to actual needs. Each battery cell 1 can be respectively provided with a positive electrode 11 and a negative electrode 12. In this embodiment, both the positive electrode 11 and the negative electrode 12 are located on the upper side of the battery cell 1.

[0045] Refer to Figure 1, the number of the detection devices 2 is equal to the number of the battery cells 1, and one detection device 2 is correspondingly used to detect one battery cell 1. Each detection device 2 may include a circuit board 21, and a detection component 22 and a wireless connection unit 23 arranged on the circuit board 21. The circuit board 21 is used to be electrically connected to the positive electrode 11 and the negative electrode 12 of a single battery cell 1 and is powered by the battery cell 1. The overall shape of the circuit board 21 may generally be rectangular or strip-shaped, and of course, it may also be of other shapes. The circuit board 21 may be an FPC board, or the circuit board 21 may be a PCB board, or the circuit board 21 may also be a rigid-flexible printed circuit board. A pair of circuits 211 (not shown) are arranged on the circuit board 21. The circuit board 21 is used to be electrically connected to the positive electrode 11 and the negative electrode 12 of a single battery cell 1 and is powered by the battery cell 1, that is, the battery cell 1 powers the detection device 2. In this way, the circuit board 21 does not need to be additionally provided with wires or wire harnesses to be connected to an external power source, so that the connecting wires for connecting the circuit board 21 to the external power source can be cancelled, further simplifying the product structure.

[0046] The circuit board 21 has a first surface 212 and a second surface (not shown) arranged along the thickness direction. The circuit 211 may be arranged on the first surface 212 of the circuit board 21, on the second surface, or buried in the circuit board 21. The circuit 211 may be made of a conductive material such as copper foil or alloy, and the circuit 211 is used to transmit current and signals. For example, when the circuit board 21 is a PCB board, the circuit 211 is usually composed of copper foil, and the copper foil is laid on a rigid substrate, and unnecessary parts are removed by chemical etching or mechanical means to form wires, pads and other connection structures matching the design of the circuit 211. When the circuit board 21 is an FPC board, the circuit 211 is usually composed of a thin metal film (such as copper) or a conductive polymer film (such as polyaniline), and the circuit 211 can be directly deposited on a flexible substrate to form a flexible conductive circuit 211 and connection structures. For the convenience of processing the circuit board 21, some positioning holes and the like may also be arranged on the circuit board 21.

[0047] Refer to Figure 1 , Figure 3 , Figure 4 , the detection component 22 may include an internal resistance detection element 221, a temperature detection element 222 and a pressure detection element 223. The internal resistance detection element 221 is used to detect the internal resistance of the battery cell 1, the temperature detection element 222 is used to detect the temperature of the battery cell 1, the pressure detection element 223 is used to detect the pressure of a single battery cell 1, the wireless connection unit 23 is electrically connected to the detection component 22 through the circuit board 21, and the detection component 22 transmits signals through the wireless connection unit 23. Refer to Figure 4, wherein, the detection component 22 of one of the detection devices 2 further includes a gas detection element 224, and the gas detection element 224 is used to detect whether the battery module 100 leaks hydrogen and / or carbon monoxide. That is to say, there are two types of detection devices 2 in the present application. The difference between the two detection devices 2 is that: one detection device 2 is provided with a gas detection element 224, and the other detection device 2 is not provided with a gas detection element 224, and the number of detection devices 2 provided with a gas detection element 224 is one.

[0048] The internal resistance detection element 221 is arranged on the circuit board 21 and electrically connected to the circuit 211. The internal resistance detection element 221 is used to detect the internal resistance of a single battery cell 1. The internal resistance detection element 221 can be electrically connected to the positive electrode 11 and the negative electrode 12 of the single battery cell 1 through the circuit 211. The internal resistance detection element 221 can obtain the internal resistance of the battery cell 1 by detecting the voltage change of the battery cell 1. The internal resistance detection element 221 can be electrically connected to the wireless connection unit 23 through the circuit 211, and the internal resistance detection element 221 can transmit the internal resistance data (or the collected signal) of the battery cell 1 to the battery management system through the wireless connection unit 23.

[0049] The temperature of each battery cell 1 is monitored in real time, which can ensure that abnormal conditions of the battery cell 1 are detected in time, and the battery cell 1 with abnormal temperature can be processed in time, avoiding safety accidents caused by too high temperature of the battery cell 1, and greatly improving the safety performance of the battery cell 1. The highest surface temperature of the battery cell 1 usually appears near the positive electrode 11 of the battery cell 1. The temperature detection element 222 is preferably arranged at a position close to the positive electrode 11 of the battery cell 1, so that the temperature of the battery cell 1 can be monitored more accurately.

[0050] The temperature detection element 222 is preferably a temperature-sensitive chip. The temperature-sensitive chip usually has higher accuracy and sensitivity than traditional thermistors (PTC thermistors or NTC thermistors). The temperature-sensitive chip can more accurately sense and measure the temperature change of the battery cell 1 and provide more reliable temperature data. The temperature-sensitive chip is usually smaller and more compact, and can be easily integrated into the circuit board 21, which can save space and simplify the design, and is especially suitable for application scenarios that require high integration and miniaturization. The temperature-sensitive chip usually has more safety protection functions, can detect overheating in time and take corresponding measures, such as sending warning signals or triggering the protection mechanism of the system, which helps to prevent overheating, overload and other potential dangerous situations of the battery cell 1. Compared with traditional thermistors, the temperature-sensitive chip usually has better cost-effectiveness. The production cost of the temperature-sensitive chip is lower, and it is easy to integrate and use, which helps to improve the competitiveness and feasibility of the overall product.

[0051] The pressure of each battery cell 1 is monitored in real time, which can ensure the timely detection of abnormal conditions of the battery cell 1 and the timely handling of the battery cell 1 with abnormal pressure, avoiding safety accidents caused by excessive pressure of the battery cell 1 and greatly improving the safety performance of the battery cell 1. The pressure detection element 223 is one or more of a piezoelectric pressure sensor, an elastic membrane pressure sensor, a capacitance pressure sensor, a strain pressure sensor, a volumetric pressure sensor, and a piezoresistive pressure sensor. Of course, other types of pressure sensors can also be selected.

[0052] The gas detection element 224 is one or more of a thermal conductivity sensor, a conductivity sensor, an optical fiber sensor, and an electrochemical sensor. Of course, other types of hydrogen sensors and carbon monoxide sensors can also be selected. For example, the thermal conductivity sensor can detect the hydrogen concentration by measuring the change in the thermal conductivity of hydrogen. When hydrogen is present, hydrogen will affect the conduction speed of heat in the thermal conductivity sensor, resulting in a temperature change. The thermal conductivity sensor calculates the hydrogen concentration based on the temperature change and outputs a corresponding electrical signal.

[0053] The wireless connection unit 23 has a wireless transmission function. The wireless connection unit 23 can be arranged on the circuit board 21 and electrically connected to the circuit board 21. The wireless connection unit 23 is electrically connected to the detection component 22 through the circuit board 21, and the detection component 22 transmits signals through the wireless connection unit 23. For example, the detection component 22 realizes signal transmission with the battery management system through the wireless connection unit 23. The wireless connection unit 23 includes, but is not limited to, one of a Bluetooth connection unit, a radio frequency connection unit, a ZigBee connection unit, and a WiFi connection unit. The wireless connection unit 23 can reduce or eliminate the wires or wire harnesses between the circuit board 21 and the battery management system, simplify the product structure, and at the same time avoid signal transmission failures caused by damage or loosening of the wires or wire harnesses, improving the stability of signal transmission between the circuit board 21 and the battery management system.

[0054] In this application, the internal resistance detection element 221, temperature detection element 222, and pressure detection element 223 of each detection device 2 are used to detect the internal resistance, temperature, and pressure of each battery cell 1. Since the detection sensitivity of the gas detection element 224 is extremely high, only one detection device 2 needs to be provided with the gas detection element 224 to detect the entire battery module 100, and it is not necessary to provide the gas detection element 224 for each detection device 2, which simplifies the structure of the detection device 2. By wirelessly connecting to the battery management system through the wireless connection unit 23, there is no need to additionally set wires or wire harnesses, which reduces the space occupied by the detection device 2, thereby increasing the energy density of the battery cell 1, simplifying the structure of the battery module 100, reducing the overall volume and weight of the battery module 100, and also reducing the safety risks brought by excessive wires or wire harnesses, avoiding problems such as loosening and damage of the wires or wire harnesses. At the same time, it improves the stability of communication with the battery management system, thereby extending the service life of the detection device 2 and improving the stability of communication with the battery management system, further improving the safety, reliability, and stability of the battery module 100, and also reducing the complexity of the assembly process and production costs. At the same time, one detection device 2 is correspondingly provided for each battery cell 1, which not only avoids the mutual influence between the detection devices 2, greatly improves the accuracy of detection and the accurate positioning of the faulty battery cell 1, but also makes the splicing of the battery cells 1 more flexible, and is also conducive to the replacement and maintenance of the detection device 2. Through the wireless connection unit 23, it can also be wirelessly connected to other devices. For example, it can be upgraded or maintained through the wireless connection unit 23, that is, the over-the-air upgrade of the software of the detection device 2 is realized. The wireless connection unit 23 greatly reduces the system cost of the detection device 2 in calibration, installation, detection, and maintenance.

[0055] In a specific embodiment, the detection device 2 can be disposed outside a single battery cell 1 or embedded in a single battery cell 1, that is, the detection device 2 can be disposed outside a single battery cell 1. For example, it can be disposed on the upper surface of the single battery cell 1 where the positive electrode 11 and the negative electrode 12 are provided. The detection device 2 can also be embedded in a single battery cell 1, that is, integrally disposed inside a single battery cell 1. In this embodiment, the detection device 2 is disposed outside a single battery cell 1, that is, the detection device 2 can be disposed outside a single battery cell 1. More preferably, the detection device 2 is disposed close to the positive electrode 11 and the negative electrode 12 of the single battery cell 1. The positive electrode 11 and the negative electrode 12 of the battery cell 1 are generally disposed on the upper surface of the battery cell 1, that is, the detection device 2 is disposed on the upper surface of the battery cell 1.

[0056] As a preferred method, referring to Figure 1, the battery module 100 may further include a bus bar 3. The bus bar 3 is used to connect multiple battery cells 1 in series, parallel, or in a hybrid connection. The circuit board 21 of the detection device 2 is connected to the bus bar 3 and is electrically connected to the positive electrode 11 and the negative electrode 12 of a single battery cell 1 through the bus bar 3. That is, each detection device 2 is only used to detect one battery cell 1.

[0057] Specifically, referring to Figure 1 , the bus bar 3 may include a connecting row 31 and a wiring row 32. The connecting row 31 is used to electrically connect multiple battery cells 1, and the wiring row 32 is used to connect the positive electrode 11 or the negative electrode 12 of a single battery cell 1. The connecting row 31 is used to connect at least two battery cells 1 in series, parallel, or in a hybrid connection. A hybrid connection means including both parallel and series connections. The wiring row 32 can serve as a conductive contact point to enable the battery cell 1 to be connected to other lines 211 through a wire, realizing the guidance and transmission of current. For example, the wiring row 32 is provided at the positive electrode 11 or the negative electrode 12 of the first battery cell 1 of the battery module 100 that is not connected to the connecting row 31, and the wiring row 32 is provided at the positive electrode 11 or the negative electrode 12 of the last battery cell 1 of the battery module 100 that is not connected to the connecting row 31.

[0058] The materials of both the connecting row 31 and the wiring row 32 can be aluminum, so that the connecting row 31 and the wiring row 32 have good electrical conductivity and improve the overcurrent capacity. Aluminum is a lightweight metal, which can reduce the weight of the bus bar 3. Aluminum also has high electrical conductivity and good thermal conductivity, enabling the bus bar 3 to have a better heat dissipation effect. At the same time, aluminum is inexpensive, which can reduce the production cost of the bus bar 3. Of course, the materials of the connecting row 31 and the wiring row 32 can also be copper or other materials with electrical conductivity.

[0059] The number of the connecting rows 31 can be one or more, and specifically can be adaptively set according to the number of battery cells 1 to be electrically connected. The number of the wiring rows 32 can be two or more, and specifically can be adaptively set according to the number of the positive electrodes 11 or negative electrodes 12 of the single battery cells 1 to be connected. The shapes of the connecting row 31 and the wiring row 32 can be designed according to actual needs and are not specially specified here.

[0060] Referring to Figure 1 、 Figure 2, one or more wiring holes 321 may be provided on the wiring row 32. The wiring row 32 is electrically connected to other wires or components through the wiring holes 321 conveniently. A first coating (not shown) may be provided on the wiring row 32 at the wiring holes 321. The first coating is, for example, a nickel layer. The nickel layer can form a protective layer on the surface of the wiring row 32, providing excellent corrosion resistance, preventing the wiring row 32 from reacting with air, water or other chemical substances, thus extending the service life of the wiring row 32. At the same time, it can also improve the electrical conductivity of the wiring row 32, reduce the resistance and improve the current conduction efficiency.

[0061] As a preferred mode, the circuit board 21 has a first surface 212 and a second surface oppositely arranged along the thickness direction. The temperature detection element 222 is arranged on the first surface 212 of the circuit board 21 and electrically connected to the circuit 211. The second surface of the circuit board 21 corresponding to the first surface 212 of the circuit board 21 where the temperature detection element 222 is arranged is arranged on the bus bar 3. The temperature detection element 222 is used to detect the temperature of the battery cell 1. That is to say, the back surface of the temperature detection element 222 faces the bus bar 3, and the bus bar 3 can transfer the temperature of the battery cell 1 to the temperature detection element 222. The highest surface temperature of the battery cell 1 usually appears near the positive electrode 11 of the battery cell 1. The temperature detection element 222 is preferably arranged at a position close to the positive electrode 11 of the battery cell 1, so that the temperature of the battery cell 1 can be monitored more accurately.

[0062] A heat conducting member (not shown) may be provided between the temperature detection element 222 and the bus bar 3. One side of the heat conducting member is in contact with the bus bar 3, and the other side of the heat conducting member is in contact with the temperature detection element 222. The heat conducting member is, for example, heat conducting silica gel, heat conducting pad, etc. The heat conducting member is used to transfer the temperature of the battery cell 1 to the temperature detection element 222. When the temperature detection element 222 is arranged on the bus bar 3, a heat conducting member may be provided between the bus bar 3 and the battery cell 1. The heat conducting member is used to transfer the temperature of the battery cell 1 to the bus bar 3, and the bus bar 3 transfers the temperature to the temperature detection element 222. The heat conducting member can transfer the temperature of the battery cell 1 to the temperature detection element 222 better, so as to improve the accuracy of the temperature detection of the battery cell 1 by the temperature detection element 222.

[0063] In another embodiment, a nickel sheet (not shown) is disposed between the heat conducting member and the bus bar 3. The nickel sheet can be connected to the bus bar 3 by laser welding. A second plating layer (not shown) is provided on the side of the nickel sheet facing the bus bar 3. The second plating layer is, for example, a tin layer, which helps with laser welding, improves the welding quality, and enhances the bonding force between the nickel sheet and the bus bar 3. On the one hand, the nickel sheet can support the temperature detection element 222 and also facilitate the determination of the installation position of the temperature detection element 222. On the other hand, the nickel sheet has good thermal conductivity. Fixing the temperature detection element 222 on the nickel sheet can promote the optimization of the heat transfer effect. By more effectively transferring heat to the temperature detection element 222, the response speed and accuracy of temperature measurement can be improved.

[0064] The pressure detection element 223 can be disposed on the first surface 212 or the second surface of the circuit board 21. The pressure detection element 223 can also be exposed from both the first surface 212 and the second surface of the circuit board 21, that is, the pressure detection element 223 is disposed through the circuit board 21. In this embodiment, the pressure detection element 223 can also be exposed from both the first surface 212 and the second surface of the circuit board 21. The pressure detection element 223 is preferably disposed at a position where the battery cell 1 is prone to deformation. For example, when a pressure relief valve 13 is provided on the battery cell 1, the pressure detection element 223 is disposed above the pressure relief valve 13 or near the pressure relief valve 13. In this way, the pressure detection element 223 can not only detect the abnormal pressure of the battery cell 1 more timely, but also detect whether there is leakage of electrolyte or the like in the battery cell 1, further improving the overall safety performance of the battery module 100.

[0065] The gas detection element 224 can be disposed on the first surface 212 or the second surface of the circuit board 21. The gas detection element 224 can also be exposed from both the first surface 212 and the second surface of the circuit board 21, that is, the gas detection element 224 is disposed through the circuit board 21. In this embodiment, the gas detection element 224 can also be exposed from both the first surface 212 and the second surface of the circuit board 21. The gas detection element 224 is preferably disposed at a position where the battery cell 1 is prone to air leakage. For example, when a pressure relief valve 13 is provided on the battery cell 1, the gas detection element 224 is disposed above the pressure relief valve 13 or near the pressure relief valve 13, so that the gas detection element 224 can timely detect the leakage of hydrogen and / or carbon monoxide, and can also ensure the accuracy of the detection by the gas detection element 224, improving the overall safety performance of the battery module 100. Further, the gas detection element 224 is disposed near the middle position of the battery module 100, that is, the detection device 2 provided with the gas detection element 224 is disposed near the middle position of the battery module 100. In this way, the accuracy of the gas detection element 224 in detecting the entire battery module 100 can be improved.

[0066] In a specific embodiment, referring to Figure 1 , the battery module 100 may further include a first separator 4, and the first separator 4 is disposed between the bus bar 3 and the battery cell 1. That is, the first separator 4 is disposed above the battery cell 1, the first separator 4 is disposed below the bus bar 3 and the circuit board 21, and the first separator 4 is used to connect the bus bar 3 and the circuit board 21 into a whole. The first separator 4 is preferably made of an insulating material. The first separator 4 may be made of a material with a certain hardness or may be made of a flexible material, which can be selected according to actual needs. In this embodiment, the first separator 4 is preferably made of a material with a certain hardness. The bus bar 3 may be disposed on the first separator 4. For example, the bus bar 3 is fixedly connected to the first separator 4 through a fixing member, an adhesive material, etc. The circuit board 21 may also be disposed on the first separator 4. For example, the circuit board 21 is fixedly connected to the first separator 4 through a fixing member, an adhesive material, etc. The first separator 4 connects the bus bar 3 and the circuit board 21 into a whole, which can make it more convenient to install the bus bar 3 and the circuit board 21 on the battery cell 1 and improve the production efficiency.

[0067] A plurality of first hollow portions 41 may be provided on the first separator 4, and the bus bar 3 is electrically connected to the battery cell 1 through the first hollow portions 41. The positions where the first hollow portions 41 are provided correspond to the positions of the positive and negative electrodes 12 of the battery cell 1. The bus bar 3 protrudes from the first hollow portions 41 and is electrically connected to the positive and negative electrodes 12 of the battery cell 1 to ensure that the bus bar 3 can be stably electrically connected to the positive and negative electrodes 12 of the battery cell 1.

[0068] A second hollow portion 42 may also be provided on the first separator 4, and the side of the pressure detection element 223 facing the battery cell 1 protrudes from the second hollow portion 42. In this way, the pressure detection element 223 can be closer to the battery cell 1 or directly contact the battery cell 1, improving the accuracy of the detection result of the pressure detection element 223, timely detecting the abnormal condition of the battery cell 1, and improving the safety performance of the battery module 100.

[0069] A third hollow portion 43 may also be provided on the first separator 4, and the side of the gas detection element 224 facing the battery cell 1 protrudes from the third hollow portion 43. In this way, the gas detection element 224 can be closer to the battery cell 1, preventing the first separator 4 from isolating the hydrogen and / or carbon monoxide leaked from the battery cell 1 from the gas detection element 224, improving the accuracy of the detection result of the gas detection element 224, timely detecting the abnormal condition of the battery cell 1, and improving the safety performance of the battery module 100.

[0070] As a preferred method, referring to Figure 1 , Figure 3, the battery module 100 may further include a second separator 5, which is disposed above the bus bar 3 and the circuit board 21. The second separator 5 is preferably made of an insulating material. The second separator 5 may be made of a material with a certain hardness or a flexible material, which can be selected according to actual needs and is not limited herein. On the one hand, the second separator 5 can isolate the bus bar 3 from the outside world, preventing short circuits between the bus bars 3 caused by external metal foreign objects or liquids, etc., and improving the safety of the battery module 100; on the other hand, it can prevent dust and foreign objects from falling in and affecting the performance of the integrated battery module 100. The second separator 5 and the first separator 4 clamp the bus bar 3 and the detection device 2, preventing the position of the detection device 2 from shifting and enabling multiple parts to be integrally arranged.

[0071] Referring to Figure 1 , a protrusion 311 may be provided on the bus bar 3, that is, a protrusion 311 may be provided on the connection bar 31. The shape of the protrusion 311 is, for example, an arched shape or the like. A fourth hollow portion 51 may be provided on the second separator 5, and the protrusion 311 protrudes from the fourth hollow portion 51. The shape of the protrusion 311 is not particularly limited, and the number of the protrusions 311 may be one or more. The protrusion 311 has a better heat dissipation effect and can quickly dissipate the heat generated by the battery cell 1. It can also enhance the structural strength of the connection bar 31. The protrusion 311 protrudes from the fourth hollow portion 51, preventing the second separator 5 from reducing the heat dissipation effect of the protrusion 311.

[0072] A fifth hollow portion 52 may also be provided on the second separator 5, and the internal resistance detection element 221 protrudes from the fifth hollow portion 52. This can prevent the internal resistance detection element 221 from being in a high-temperature environment for a long time, which can not only improve the accuracy of the detection result of the internal resistance detection element 221, but also extend the service life of the internal resistance detection element 221.

[0073] A sixth hollow portion 53 may also be provided on the second separator 5, and the temperature detection element 222 protrudes from the sixth hollow portion 53. This can prevent the temperature detection element 222 from being in a high-temperature environment for a long time, which can not only improve the accuracy of the detection result of the temperature detection element 222, but also extend the service life of the temperature detection element 222.

[0074] A seventh hollow portion 54 may also be provided on the second separator 5, and the pressure detection element 223 protrudes from the seventh hollow portion 54. This can prevent the pressure detection element 223 from being in a high-temperature environment for a long time, which can not only improve the accuracy of the detection result of the pressure detection element 223, but also extend the service life of the pressure detection element 223.

[0075] An eighth hollow portion 55 may also be provided on the second partition plate 5, and the gas detection element 224 is exposed from the eighth hollow portion 55. This can prevent the gas detection element 224 from being in a high-temperature environment for a long time, which can not only improve the accuracy of the detection result of the gas detection element 224, but also extend the service life of the gas detection element 224.

[0076] A ninth hollow portion 56 may also be provided on the second partition plate 5, and the wireless connection unit 23 is exposed from the ninth hollow portion 56. This can prevent the second partition plate 5 from reducing the signal strength, ensure the stability of the transmission and reception of signals by the wireless connection unit 23, and can also prevent the wireless connection unit 23 from being in a high-temperature environment for a long time, extending the service life of the wireless connection unit 23.

[0077] In a specific embodiment, referring to Figure 1 , a plurality of fixing holes 6 are further provided on the bus bar 3, the circuit board 21, the first partition plate 4 and the second partition plate 5. The shape and size of the fixing holes 6 can be various, and the shape and size of the fixing holes 6 can be set according to actual needs. A connecting member (not shown) can connect at least two of the bus bar 3, the circuit board 21, the first partition plate 4 and the second partition plate 5 through the fixing holes 6. The connecting member can more stably fix the bus bar 3, the circuit board 21, the first partition plate 4 and the second partition plate 5 together through the fixing holes 6, and can also more stably fix the bus bar 3, the circuit board 21, the first partition plate 4 and the second partition plate 5 to the battery cell 1 together.

[0078] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principle and purpose of the present invention. All these changes should fall within the protection scope of the claims of the present invention.

Claims

1. A battery module with a detection device, characterized in that, Comprising: A plurality of battery cells, the plurality of battery cells being arranged in sequence; Detection devices, the number of the detection devices being equal to the number of the battery cells, and one of the detection devices being correspondingly used for detecting one of the battery cells. Each of the detection devices includes a circuit board, a detection component and a wireless connection unit arranged on the circuit board. The circuit board is used for being electrically connected to the positive electrode and the negative electrode of a single battery cell and being powered by the battery cell. The detection component includes an internal resistance detection element, a temperature detection element and a pressure detection element. The internal resistance detection element is used for detecting the internal resistance of the battery cell. The temperature detection element is used for detecting the temperature of the battery cell. The pressure detection element is used for detecting the pressure of a single battery cell. The wireless connection unit is electrically connected to the detection component through the circuit board, and the detection component transmits signals through the wireless connection unit; Wherein, the detection component of one of the detection devices further includes a gas detection element, and the gas detection element is used for detecting whether the battery module leaks hydrogen and / or carbon monoxide.

2. The battery module with a detection device according to claim 1, wherein, Each of the detection devices is respectively arranged outside a single battery cell or embedded in a single battery cell.

3. The battery module with a detection device according to claim 1, characterized in that, The temperature detection element is a temperature sensing chip; The pressure detection element is one or more of a piezoelectric pressure sensor, an elastic membrane pressure sensor, a capacitance pressure sensor, a strain pressure sensor, a volumetric pressure sensor, a piezoresistive pressure sensor; The gas detection element is one or more of a thermal conductivity sensor, a conductivity sensor, an optical fiber sensor, an electrochemical sensor; The wireless connection unit is one of a Bluetooth connection unit, a radio frequency connection unit, a ZigBee connection unit, a WiFi connection unit.

4. The battery module with a detection device according to claim 1, wherein The circuit board has a first surface and a second surface arranged in the thickness direction, and a plurality of circuits are arranged on the circuit board. The circuits are arranged on the first surface of the circuit board; and / or, The circuits are arranged on the second surface of the circuit board; and / or, The circuits are buried in the circuit board.

5. The battery module with a detection device according to claim 4, characterized in that, It further includes a bus bar, the bus bar includes a connection row and a wiring row. The connection row is used for connecting the plurality of battery cells in series, in parallel or in a hybrid connection. The wiring row is used for connecting the positive electrode or the negative electrode of a single battery cell. The circuit board of the detection device is connected to the bus bar and is electrically connected to the positive electrode and the negative electrode of a single battery cell through the bus bar.

6. The battery module with a detection device according to claim 5, characterized in that, The temperature detection element is arranged on the first surface of the circuit board, and the second surface of the circuit board is arranged on the bus bar; A heat conducting member is arranged between the temperature detection element and the bus bar. One side of the heat conducting member is in contact with the bus bar, and the other side of the heat conducting member is in contact with the temperature detection element; and / or, When a pressure relief valve is arranged on the battery cell, the pressure detection element is arranged above the pressure relief valve or near the pressure relief valve.

7. The battery module with a detection device according to claim 5, characterized in that, It further includes a first isolation plate, and the first isolation plate is arranged between the bus bar and the battery cell.

8. The battery module with a detection device according to claim 7, characterized in that, The first isolation plate is provided with a first hollow portion, and the bus bar is electrically connected to the battery cell through the first hollow portion; and / or, The first isolation plate is provided with a second hollow portion, and one side of the pressure detection element facing the battery cell is exposed from the second hollow portion; and / or, The first isolation plate is provided with a third hollow portion, and one side of the gas detection element facing the battery cell is exposed from the third hollow portion.

9. The battery module with a detection device according to claim 5, wherein It further includes a second isolation plate, and the second isolation plate is disposed above the bus bar and the circuit board.

10. The battery module with a detection device according to claim 9, characterized in that, The bus bar is provided with a convex portion, the second isolation plate is provided with a fourth hollow portion, and the convex portion is exposed from the fourth hollow portion; and / or, The second isolation plate is provided with a fifth hollow portion, and the internal resistance detection element is exposed from the fifth hollow portion; and / or, The second isolation plate is provided with a sixth hollow portion, and the temperature detection element is exposed from the sixth hollow portion; and / or, The second isolation plate is provided with a seventh hollow portion, and the pressure detection element is exposed from the seventh hollow portion; and / or, The second isolation plate is provided with an eighth hollow portion, and the gas detection element is exposed from the eighth hollow portion; and / or, The second isolation plate is provided with a ninth hollow portion, and the wireless connection unit is exposed from the ninth hollow portion.

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