Wireless electric core detection device and battery module

Abstract

The utility model discloses a wireless electric core detection device and a battery module. The wireless electric core detection device is arranged outside a single electric core or embedded in the single electric core. The wireless electric core detection device comprises a circuit board, a detection unit and a wireless transmission unit. A plurality of circuits are arranged on the circuit board, and the circuit board is used for being electrically connected with the positive electrode and the negative electrode of a single battery cell and powered by the battery cells. The detection unit comprises an internal resistance detection element, and the internal resistance detection element is arranged on the circuit board, electrically connected with the circuit and used for detecting the internal resistance of the single battery cell. The wireless transmission unit is arranged on the circuit board and electrically connected with the circuit board, the wireless transmission unit is electrically connected with the detection unit through the circuit board, and the detection unit transmits signals through the wireless transmission unit. And the wireless transmission unit is wirelessly connected with the battery management system, so that the occupied space is reduced, the problems of loosening and damage of a lead or a wire harness and the like are avoided, and the complexity of an assembly process and the production cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery detection equipment, in particular to a radio core detection device and a battery module. Background Art

[0002] In order to protect the environment and solve the energy supply problem, renewable resources such as solar energy, wind energy, and water energy are converted into electric energy. As a storage device for renewable energy, the battery module has been widely used. With the increase in the energy density of the battery core and the progress of fast charging technology, the risks also increase. 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 battery core is 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 cores, in order to independently detect each battery core, 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 core, and the reliability of the battery module is reduced due to the loosening of the connection of the wires or wire harnesses. On the other hand, the connection 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. The resistance change of the connection of multiple wires or wire harnesses is large, resulting in the inability to detect a single battery core.

[0004] Therefore, the existing device for detecting the battery core needs to be improved. Summary of the Invention

[0005] The purpose of the utility model is to provide a radio core detection device and a battery module, which can not only independently detect each battery core, but also reduce the occupied space, thereby improving the energy density of the battery core, and at the same time improving the stability of communication 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 radio core detection device, the radio core detection device is arranged outside a single battery core or embedded in a single battery core, and includes:

[0008] A circuit board, on which multiple circuits are arranged, and the circuit board is used for electrically connecting with the positive and negative electrodes of the single battery core and being powered by the battery core;

[0009] A detection unit, the detection unit includes an internal resistance detection element, the internal resistance detection element is arranged on the circuit board and electrically connected with the circuit, and the internal resistance detection element is used for detecting the internal resistance of the single battery core;

[0010] A wireless transmission unit, which is disposed on the circuit board and electrically connected to the circuit board. The wireless transmission unit is electrically connected to the detection unit through the circuit board, and the detection unit transmits signals through the wireless transmission unit.

[0011] Preferably, the detection unit further includes a temperature detection element and a pressure detection element. The temperature detection element and the pressure detection element are both disposed on the circuit board and electrically connected to the circuit. The temperature detection element is used to detect the temperature of the battery cell, and the pressure detection element is used to detect the pressure of the battery cell.

[0012] Preferably, the temperature detection element is a temperature sensing 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] Preferably, the wireless transmission unit is one of a Bluetooth connection unit, a radio frequency connection unit, a ZigBee connection unit, and a WiFi connection unit.

[0015] A battery module includes the radio battery cell detection device as described in any one of the above, a plurality of battery cells, and a bus bar. The bus bar is used to connect the plurality of battery cells in series, parallel, or in a mixed connection. The circuit board of the radio battery cell 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.

[0016] Preferably, the circuit board has a first surface and a second surface that are oppositely disposed in the thickness direction. 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;

[0017] A heat conducting member is disposed between the temperature detection element and the bus bar. One surface of the heat conducting member is in contact with the bus bar, and the other surface of the heat conducting member is in contact with the temperature detection element; and / or,

[0018] 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.

[0019] Preferably, it further includes a first insulating plate, and the first insulating plate is disposed between the bus bar and the battery cell.

[0020] Preferably, a first through hole is provided on the first insulating plate, and the bus bar is electrically connected to the battery cell through the first through hole; and / or,

[0021] A second through-hole is provided on the first insulating plate, and one side of the pressure detection element facing the battery cell is exposed from the second through-hole.

[0022] Preferably, a second insulating plate is further included, and the second insulating plate is disposed above the bus bar and the circuit board.

[0023] Preferably, a convex portion is provided on the bus bar, and a third through-hole is provided on the second insulating plate, and the convex portion is exposed from the third through-hole; and / or,

[0024] a fourth through-hole is provided on the second insulating plate, and the temperature detection element is exposed from the fourth through-hole; and / or,

[0025] a fifth through-hole is provided on the second insulating plate, and the pressure detection element is exposed from the fifth through-hole; and / or,

[0026] a sixth through-hole is provided on the second insulating plate, and the internal resistance detection element is exposed from the sixth through-hole.

[0027] Compared with the prior art, the beneficial effects of the present utility model at least include:

[0028] The radio battery cell detection device and the battery module of the present utility model are wirelessly connected to the battery management system through a wireless transmission unit, and there is no need to provide a connection to the battery management system through a wire or a wire harness, reducing the occupied space of the radio battery cell detection device, thereby increasing the energy density of the battery cell, and also avoiding problems such as loosening and damage of the wire or wire harness, thus extending the service life of the radio battery cell detection device and improving the communication stability with the battery management system, thereby ensuring the safety, reliability and stability of the battery cell, reducing the assembly process and material costs, and further reducing the production cost. At the same time, a radio battery cell detection device is provided corresponding to each battery cell, which can not only independently detect each battery cell, greatly improving the accuracy, but also making the splicing of the battery cells more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is an exploded schematic view of the battery module according to an embodiment of the present utility model.

[0030] Figure 2 is a schematic structural view of the battery module according to an embodiment of the present utility model.

[0031] Figure 3 is a schematic view of the connection between the radio battery cell detection device and the battery cell in an embodiment of the present utility model.

[0032] In the figure: 100, battery module; 1, radio battery cell detection device; 11, circuit board; 111, circuit; 112, first side; 12, detection unit; 121, internal resistance detection element; 122, temperature detection element; 123, pressure detection element; 13, wireless transmission unit; 2, bus bar; 21, connection bar; 211, protrusion; 22, wiring bar; 221, connection hole; 3, battery cell; 31, positive electrode; 32, negative electrode; 33, pressure relief valve; 4, first insulating plate; 41, first through hole; 42, second through hole; 5, second insulating plate; 51, third through hole; 52, fourth through hole; 53, fifth through hole; 54, sixth through hole; 55, seventh through hole; 6, mounting hole. Detailed implementation manners

[0033] 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 the same or similar structures, and thus their repetitive description will be omitted.

[0034] The words expressing positions and directions described in this utility model are illustrative with reference to the drawings, but can be changed according to needs, and all changes made are included within the protection scope of this utility model.

[0035] Referring to Figure 1 、 Figure 3 , this utility model provides a radio battery cell detection device 1. The radio battery cell detection device 1 is disposed outside a single battery cell 3 or embedded in a single battery cell 3, that is, the radio battery cell detection device 1 can be disposed outside a single battery cell 3, for example, on the upper surface of a single battery cell 3 provided with a positive electrode 31 and a negative electrode 32, and the radio battery cell detection device 1 can also be embedded in a single battery cell 3, that is, integrally disposed inside a single battery cell 3.

[0036] The radio battery cell detection device 1 may include: a circuit board 11, a detection unit 12, and a wireless transmission unit 13. The detection unit 12 and the wireless transmission unit 13 are disposed on the circuit board 11 and are electrically connected through the circuit board 11.

[0037] Specifically, the overall circuit board 11 can generally be rectangular or strip-shaped. Of course, it can also be of other shapes. The circuit board 11 can be an FPC board, a PCB board, or a rigid-flex board. A pair of circuits 111 (not shown) are provided on the circuit board 11. The circuit board 11 is used to be electrically connected to the positive electrode 31 and the negative electrode 32 of a single battery cell 3 and is powered by the battery cell 3, that is, the battery cell 3 powers the radio battery cell detection device 1. In this way, the circuit board 11 does not need to be connected to an external power source, and thus the connection line connecting the circuit board 11 to the external power source can be eliminated, further simplifying the product structure.

[0038] The circuit board 11 has a first surface 112 and a second surface (not shown) provided along the thickness direction. The circuit 111 can be provided on the first surface 112 of the circuit board 11, on the second surface, or buried inside the circuit board 11. The circuit 111 can be made of a conductive material such as copper foil or alloy, and the circuit 111 is used to transmit current and signals. For example, when the circuit board 11 is a PCB board, the circuit 111 is usually composed of copper foil, and the copper foil is laid on a rigid substrate, and the unnecessary parts are removed by chemical etching or mechanical means to form conductors, pads, and other connection structures matching the design of the circuit 111. When the circuit board 11 is an FPC board, the circuit 111 is usually composed of a thin metal film (such as copper) or a conductive polymer film (such as polyaniline), and the circuit 111 can be directly deposited on a flexible substrate to form a flexible conductive circuit 111 and connection structures. For the convenience of processing the circuit board 11, some positioning holes and the like can also be provided on the circuit board 11.

[0039] Referring to Figure 1 、 Figure 3 , the detection unit 12 can include an internal resistance detection element 121. The number of internal resistance detection elements 121 can be one or more. In this embodiment, the number of internal resistance detection elements 121 is one. The internal resistance detection element 121 is provided on the circuit board 11 and is electrically connected to the circuit 111. The internal resistance detection element 121 is used to detect the internal resistance of a single battery cell 3. The internal resistance detection element 121 can be electrically connected to the positive electrode 31 and the negative electrode 32 of a single battery cell 3 through the circuit 111. The internal resistance detection element 121 can obtain the internal resistance of the battery cell 3 by detecting the voltage change of the battery cell 3. The internal resistance detection element 121 can be electrically connected to the wireless transmission unit 13 through the circuit 111. The internal resistance detection element 121 can transmit the internal resistance data (or the collected signal) of the battery cell 3 to the battery management system through the wireless transmission unit 13.

[0040] The wireless transmission unit 13 has a wireless transmission function. The wireless transmission unit 13 can be arranged on the circuit board 11 and electrically connected to the circuit board 11. The wireless transmission unit 13 is electrically connected to the detection unit 12 through the circuit board 11. The detection unit 12 transmits signals through the wireless transmission unit 13. For example, the detection unit 12 realizes signal transmission with the battery management system through the wireless transmission unit 13. The wireless transmission unit 13 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 transmission unit 13 can reduce or eliminate the wires or wire harnesses between the circuit board 11 and the battery management system, simplifies the product structure, and at the same time avoids signal transmission failures caused by damage or loosening of the wires or wire harnesses, improving the stability of signal transmission between the circuit board 11 and the battery management system.

[0041] In this application, the wireless transmission unit 13 is wirelessly connected to the battery management system, eliminating the need for a connection to the battery management system through wires or wire harnesses, reducing the occupied space of the radio battery cell detection device 1, thereby increasing the energy density of the battery cell 3. It also avoids problems such as loosening and damage of wires or wire harnesses, thus extending the service life of the radio battery cell detection device 1 and improving the stability of communication with the battery management system, further ensuring the safety, reliability, and stability of the battery cell 3. It also reduces the assembly process and material costs, thereby reducing the production cost. At the same time, one radio battery cell detection device 1 is correspondingly set for each battery cell 3, which can not only independently detect each battery cell 3, but also make the splicing of the battery cells 3 more flexible, and adjacent radio battery cell detection devices 1 do not interfere with each other, improving the accuracy of detection. It can also accurately locate and promptly determine the battery cell 3 with abnormalities. Through the wireless transmission unit 13, it can also be wirelessly connected to other devices. For example, it can be upgraded or maintained through the wireless transmission unit 13, that is, realize the over-the-air upgrade of the software of the radio battery cell detection device 1. The wireless transmission unit 13 significantly reduces the system cost of the radio battery cell detection device 1 in calibration, installation, detection, and maintenance.

[0042] As a preferred method, referring to Figure 1 , Figure 3 , the detection unit 12 may further include a temperature detection element 122 and a pressure detection element 123. The temperature detection element 122 and the pressure detection element 123 are both arranged on the circuit board 11 and electrically connected to the circuit 111. The temperature detection element 122 is used to detect the temperature of the battery cell 3, and the pressure detection element 123 is used to detect the pressure of the battery cell 3.

[0043] The temperature of each battery cell 3 is monitored in real time, which can ensure the timely detection of abnormal conditions of the battery cell 3 and the timely handling of the battery cell 3 with abnormal temperature, avoiding safety accidents caused by excessive temperature of the battery cell 3 and greatly improving the safety performance of the battery cell 3. The highest surface temperature of the battery cell 3 usually appears near the positive electrode 31 of the battery cell 3. The temperature detection element 122 is preferably arranged at a position close to the positive electrode 31 of the battery cell 3, so that the temperature of the battery cell 3 can be monitored more accurately.

[0044] The temperature detection element 122 is preferably a temperature sensing chip. The temperature sensing chip usually has higher accuracy and sensitivity than traditional thermistors (PTC thermistors or NTC thermistors). The temperature sensing chip can more accurately sense and measure the temperature change of the battery cell 3 and provide more reliable temperature data. The temperature sensing chip is usually smaller and more compact, and can be easily integrated into the circuit board 11, which can save space and simplify the design, and is especially suitable for application scenarios that require high integration and miniaturization. The temperature sensing chip usually has more safety protection functions, can detect overheating situations 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 3. Compared with traditional thermistors, the temperature sensing chip usually has better cost-effectiveness. The production cost of the temperature sensing chip is lower, and it is easy to integrate and use, which helps to improve the competitiveness and feasibility of the overall product.

[0045] The pressure of each battery cell 3 is monitored in real time, which can ensure the timely detection of abnormal conditions of the battery cell 3 and the timely handling of the battery cell 3 with abnormal pressure, avoiding safety accidents caused by excessive pressure of the battery cell 3 and greatly improving the safety performance of the battery cell 3. The pressure detection element 123 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. Of course, other types of pressure sensors can also be selected.

[0046] Refer to Figures 1 to 3, the present utility model further provides a battery module 100, which includes the radio core detection device 1 as described in any one of the above, a plurality of cores 3, and a bus bar 2. The bus bar 2 is used to connect the plurality of cores 3 in series, parallel, or in a hybrid connection. The circuit board 11 of the radio core detection device 1 is connected to the bus bar 2 and is electrically connected to the positive electrode 31 and the negative electrode 32 of a single core 3 through the bus bar 2, that is, each radio core detection device 1 is only used to detect one core 3. The radio core detection device 1 of the present application can also be used in WIBS (Wireless Individual Battery System). WIBS refers to integrating and collecting data of the core 3 CCS (Cell Contact System, bus bar 2), and real-time monitoring of the single-cell voltage, temperature, internal resistance, SOC (State of Charge), SOH (State of Health), and leakage current information of the core 3. It has high-speed communication and pre-control response capabilities, and conducts big data management for the entire life cycle of the battery; it real-time monitors and predicts the operating condition trend of the core 3 (battery cluster), establishes a battery individual safety system SOS based on the battery, and updates the safe operation of the energy storage system in real time. The battery state calculation technology adopts a new algorithm, has the characteristics of self-learning and neural network models, can adapt to various types of batteries, real-time learns 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 (delays attenuation); it collaborates with the wireless PACK to research and develop and scale the front-end acquisition and active balancing chips of the battery management system, and creates a complete energy storage technology ecosystem from the core 3, BMS chips, to the BMS application system, to energy storage data aggregation, diagnostic analysis, value mining and data empowerment, to grid access to realize the energy storage value. WIBS adopts a core 3 / battery full life cycle management system and uses a big data adaptive algorithm to real-time control the energy ratio.

[0047] Specifically, referring to Figure 1 , the bus bar 2 may include a connection row 21 and a wiring row 22. The connection row 21 is used to electrically connect a plurality of cores 3, and the wiring row 22 is used to connect the positive electrode 31 or the negative electrode 32 of a single core 3. The connection row 21 is used to connect at least two cores 3 in series, parallel, or in a hybrid connection. The hybrid connection means including both parallel and series connections. The wiring row 22 can be used as a conductive contact point to enable the core 3 to be connected to other circuits 111 through a wire, realizing the guidance and transmission of current. For example, the wiring row 22 is provided at the positive electrode 31 or the negative electrode 32 of the first core 3 of the battery module 100 that is not connected to the connection row 21, and the wiring row 22 is provided at the positive electrode 31 or the negative electrode 32 of the last core 3 of the battery module 100 that is not connected to the connection row 21.

[0048] The materials of the connection row 21 and the wiring row 22 can both be aluminum, so that the connection row 21 and the wiring row 22 have good electrical conductivity and improve the overcurrent capacity. Aluminum is a lightweight metal, which can reduce the weight of the busbar 2. Aluminum also has high electrical conductivity and good thermal conductivity, enabling the busbar 2 to have better heat dissipation effect. At the same time, aluminum is inexpensive, which can reduce the production cost of the busbar 2. Of course, the materials of the connection row 21 and the wiring row 22 can also be copper or other materials with electrical conductivity.

[0049] The number of the connection rows 21 can be one or more, and specifically can be adaptively set according to the number of the battery cells 3 to be electrically connected. The number of the wiring rows 22 can be two or more, and specifically can be adaptively set according to the number of the positive electrodes 31 or negative electrodes 32 of the single battery cell 3 to be connected. The shapes of the connection row 21 and the wiring row 22 can be designed according to actual needs and are not specifically specified here.

[0050] Refer to Figure 1 , one or more connection holes 221 can be provided on the wiring row 22, and the wiring row 22 is electrically connected to other wires or components through the connection holes 221. A first coating (not shown) can be provided on the wiring row 22 at the connection holes 221. The first coating is, for example, a nickel layer. The nickel layer can form a protective layer on the surface of the wiring row 22, providing excellent corrosion resistance, preventing the wiring row 22 from reacting with air, water or other chemical substances, thereby extending the service life of the wiring row 22. At the same time, it can also improve the electrical conductivity of the wiring row 22, reduce the resistance, and improve the current conduction efficiency.

[0051] As a preferred method, the circuit board 11 has a first surface 112 and a second surface oppositely arranged in the thickness direction. The temperature detection element 122 is arranged on the first surface 112 of the circuit board 11 and is electrically connected to the circuit 111. The second surface of the circuit board 11 corresponding to the first surface 112 where the temperature detection element 122 is arranged is arranged on the busbar 2. The temperature detection element 122 is used to detect the temperature of the battery cell 3. That is to say, the back surface of the temperature detection element 122 faces the busbar 2, and the busbar 2 can transfer the temperature of the battery cell 3 to the temperature detection element 122. The highest surface temperature of the battery cell 3 usually appears near the positive electrode 31 of the battery cell 3. The temperature detection element 122 is preferably arranged at a position close to the positive electrode 31 of the battery cell 3, so that the temperature of the battery cell 3 can be monitored more accurately.

[0052] A heat-conducting member (not shown) may be provided between the temperature detection element 122 and the bus bar 2. One side of the heat-conducting member is in contact with the bus bar 2, and the other side of the heat-conducting member is in contact with the temperature detection element 122. The heat-conducting member is, for example, heat-conducting silica gel, a heat-conducting pad, etc. The heat-conducting member is used to transfer the temperature of the battery cell 3 to the temperature detection element 122. When the temperature detection element 122 is arranged on the bus bar 2, a heat-conducting member may be provided between the bus bar 2 and the battery cell 3. The heat-conducting member is used to transfer the temperature of the battery cell 3 to the bus bar 2, and the bus bar 2 transfers the temperature to the temperature detection element 122. The heat-conducting member can transfer the temperature of the battery cell 3 to the temperature detection element 122 better, so as to improve the accuracy of the temperature detection of the battery cell 3 by the temperature detection element 122.

[0053] In another embodiment, a nickel sheet (not shown) is provided between the heat-conducting member and the bus bar 2. The nickel sheet can be connected to the bus bar 2 by laser welding. A second plating layer (not shown) is provided on the side of the nickel sheet facing the bus bar 2. The second plating layer is, for example, a tin layer. The tin layer helps laser welding, improves the welding quality, and enhances the bonding force between the nickel sheet and the bus bar 2. On the one hand, the nickel sheet can support the temperature detection element 122 and also facilitate the determination of the installation position of the temperature detection element 122. On the other hand, the nickel sheet has good thermal conductivity. Fixing the temperature detection element 122 on the nickel sheet can promote the optimization of the heat transfer effect. By transferring heat to the temperature detection element 122 more effectively, the response speed and accuracy of temperature measurement can be improved.

[0054] The pressure detection element 123 may be arranged on the first surface 112 or the second surface of the circuit board 11. The pressure detection element 123 may also be exposed from both the first surface 112 and the second surface of the circuit board 11 at the same time, that is, the pressure detection element 123 is arranged through the circuit board 11. In this embodiment, the pressure detection element 123 may also be exposed from both the first surface 112 and the second surface of the circuit board 11 at the same time. The pressure detection element 123 is preferably arranged at a position where the battery cell 3 is likely to deform. For example, when a pressure relief valve 33 is provided on the battery cell 3, the pressure detection element 123 is arranged above the pressure relief valve 33 or near the pressure relief valve 33. In this way, the pressure detection element 123 can not only detect the abnormal pressure of the battery cell 3 more timely, but also detect whether there is leakage of electrolyte or the like in the battery cell 3, further improving the overall safety performance of the battery module 100.

[0055] In a specific embodiment, referring to Figure 1, the battery module 100 may further include a first insulating plate 4, which is disposed between the bus bar 2 and the battery cell 3. That is, the first insulating plate 4 is disposed above the battery cell 3, and below the bus bar 2 and the circuit board 11. The first insulating plate 4 is used to connect the bus bar 2 and the circuit board 11 as a whole. The first insulating plate 4 is preferably made of an insulating material. The first insulating plate 4 can be made of a material with a certain hardness or a flexible material, and can be selected according to actual needs. In this embodiment, the first insulating plate 4 is preferably made of a material with a certain hardness. The bus bar 2 can be disposed on the first insulating plate 4. For example, the bus bar 2 is fixedly connected to the first insulating plate 4 through fixing members, adhesive materials, etc. The circuit board 11 can also be disposed on the first insulating plate 4. For example, the circuit board 11 is fixedly connected to the first insulating plate 4 through fixing members, adhesive materials, etc. The first insulating plate 4 connects the bus bar 2 and the circuit board 11 as a whole, which can make it more convenient to install the bus bar 2 and the circuit board 11 on the battery cell 3 and improve the production efficiency.

[0056] A plurality of first through holes 41 may be provided on the first insulating plate 4. The bus bar 2 is electrically connected to the battery cell 3 through the first through holes 41. The positions where the first through holes 41 are provided correspond to the positions of the positive and negative electrodes 32 of the battery cell 3. The bus bar 2 protrudes from the first through holes 41 and is electrically connected to the positive and negative electrodes 32 of the battery cell 3 to ensure that the bus bar 2 can be stably electrically connected to the positive and negative electrodes 32 of the battery cell 3.

[0057] A second through hole 42 may also be provided on the first insulating plate 4. The side of the pressure detection element 123 facing the battery cell 3 protrudes from the second through hole 42. In this way, the pressure detection element 123 can be closer to the battery cell 3 or directly contact the battery cell 3, improving the accuracy of the detection result of the pressure detection element 123, timely detecting abnormal conditions of the battery cell 3, and improving the safety performance of the battery module 100.

[0058] As a preferred method, referring to Figure 1 , Figure 3 , the battery module 100 may further include a second insulating plate 5, which is disposed above the bus bar 2 and the circuit board 11. The second insulating plate 5 is preferably made of an insulating material. The second insulating plate 5 can be made of a material with a certain hardness or a flexible material, and can be selected according to actual needs, which is not limited here. On the one hand, the second insulating plate 5 can isolate the bus bar 2 from the outside, avoiding short circuits between the bus bars 2 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 insulating plate 5 and the first insulating plate 4 clamp the bus bar 2 and the radio battery cell detection device 1, preventing the position of the radio battery cell detection device 1 from shifting, and enabling multiple parts to be integrally arranged.

[0059] Reference Figure 1 As shown in Figure 1 , the bus bar 2 may be provided with a convex portion 211, that is, the connecting bar 21 may be provided with a convex portion 211. The shape of the convex portion 211 is, for example, an arch or the like. The second insulating plate 5 may be provided with a third through hole 51, and the convex portion 211 protrudes from the third through hole 51. The shape of the convex portion 211 is not particularly limited, and the number of the convex portions 211 may be one or more. The convex portion 211 has a better heat dissipation effect and can quickly dissipate the heat generated by the battery cell 3. It can also enhance the structural strength of the connecting bar 21. The convex portion 211 protrudes from the third through hole 51 to prevent the second insulating plate 5 from reducing the heat dissipation effect of the convex portion 211.

[0060] The second insulating plate 5 may also be provided with a fourth through hole 52, and the temperature detection element 122 protrudes from the fourth through hole 52. This can improve the accuracy of the detection result of the temperature detection element 122 and can also prevent the temperature detection element 122 from being in a high-temperature environment for a long time, thereby prolonging the service life of the temperature detection element 122.

[0061] The second insulating plate 5 may also be provided with a fifth through hole 53, and the pressure detection element 123 protrudes from the fifth through hole 53. This can improve the accuracy of the detection result of the pressure detection element 123 and can also prevent the pressure detection element 123 from being in a high-temperature environment for a long time, thereby prolonging the service life of the pressure detection element 123.

[0062] The second insulating plate 5 may also be provided with a sixth through hole 54, and the internal resistance detection element 121 protrudes from the sixth through hole 54. This can improve the accuracy of the detection result of the internal resistance detection element 121 and can also prevent the internal resistance detection element 121 from being in a high-temperature environment for a long time, thereby prolonging the service life of the internal resistance detection element 121.

[0063] The second insulating plate 5 may also be provided with a seventh through hole 55, and the wireless transmission unit 13 protrudes from the seventh through hole 55. This can prevent the second insulating plate 5 from reducing the signal strength, ensure the stability of the signal transmission and reception of the wireless transmission unit 13, and can also prevent the wireless transmission unit 13 from being in a high-temperature environment for a long time, thereby prolonging the service life of the wireless transmission unit 13.

[0064] In a specific embodiment, a plurality of mounting holes 6 are further provided on the busbar 2, the circuit board 11, the first insulating plate 4 and the second insulating plate 5. The shape and size of the mounting holes 6 can be various, and the shape and size of the mounting holes 6 can be set according to actual needs. A connecting member (not shown) can connect at least two of the busbar 2, the circuit board 11, the first insulating plate 4 and the second insulating plate 5 through the mounting holes 6. The connecting member can more stably fix the busbar 2, the circuit board 11, the first insulating plate 4 and the second insulating plate 5 together through the mounting holes 6, and can also more stably fix the busbar 2, the circuit board 11, the first insulating plate 4, the second insulating plate 5 and the battery cell 3 together.

[0065] 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. Without departing from the principle and purpose of 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, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. A radio core detection device, characterized in that, The radio core detection device is embedded inside a single core and includes: A circuit board on which multiple circuits are provided. The circuit board is used for electrically connecting to the positive and negative electrodes of the single core and is directly powered by the core. A detection unit. The detection unit includes an internal resistance detection element which is arranged on the circuit board and electrically connected to the circuit. The internal resistance detection element is used for detecting the internal resistance of the single core. A wireless transmission unit which is arranged on the circuit board and electrically connected to the circuit board. The wireless transmission unit is electrically connected to the detection unit through the circuit board, and the detection unit transmits signals through the wireless transmission unit.

2. The radio core detection device according to claim 1, characterized in that, The detection unit further includes a temperature detection element and a pressure detection element. Both the temperature detection element and the pressure detection element are arranged on the circuit board and electrically connected to the circuit. The temperature detection element is used for detecting the temperature of the core, and the pressure detection element is used for detecting the pressure of the core.

3. The radio core detection device according to claim 2, wherein The temperature detection element is a temperature-sensitive 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, and a piezoresistive pressure sensor.

4. The radio core detection device according to claim 1, wherein The wireless transmission unit is one of a Bluetooth connection unit, a radio frequency connection unit, a ZigBee connection unit, and a WiFi connection unit.

5. A battery module, characterized in that, It includes the radio core detection device according to any one of claims 1-4, multiple cores, and a bus bar. The bus bar is used for connecting the multiple cores in series, in parallel, or in a mixed connection. The circuit board of the radio core detection device is connected to the bus bar and is electrically connected to the positive and negative electrodes of the single core through the bus bar.

6. The battery module according to claim 5, wherein The circuit board has a first surface and a second surface which are oppositely arranged in the thickness direction. 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 surface of the heat-conducting member is in contact with the bus bar, and the other surface of the heat-conducting member is in contact with the temperature detection element; and / or When a pressure relief valve is provided on the core, the pressure detection element is arranged above the pressure relief valve or near the pressure relief valve.

7. The battery module according to claim 5, wherein It further includes a first insulating plate which is arranged between the bus bar and the core.

8. The battery module according to claim 7, wherein A first through hole is provided on the first insulating plate, and the bus bar is electrically connected to the core through the first through hole; and / or A second through hole is provided on the first insulating plate, and the side of the pressure detection element facing the core is exposed from the second through hole.

9. The battery module according to claim 5, wherein It further includes a second insulating plate which is arranged above the bus bar and the circuit board.

10. The battery module according to claim 9, wherein, A convex portion is provided on the bus bar, and a third through hole is provided on the second insulating plate. The convex portion is exposed from the third through hole; and / or A fourth through hole is provided on the second insulating plate, and the temperature detection element is exposed from the fourth through hole; and / or A fifth through hole is provided in the second insulating plate, and the pressure detection element is exposed from the fifth through hole; and / or, A sixth through hole is provided in the second insulating plate, and the internal resistance detection element is exposed from the sixth through hole.

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