Battery cell, battery module, battery pack, and electric device

Abstract

The present application provides a battery cell, a battery module, a battery pack, and an electric device. The battery cell comprises a battery cell unit and a temperature measurement assembly. The temperature measurement assembly comprises a battery cell support and a temperature measurer. The battery cell support is fixed to the battery cell unit. An accommodating groove is formed in the battery cell support. The temperature measurer is at least partially arranged in the accommodating groove. Compared with the prior art in which a temperature measurer is prone to falling off, the present application improves the reliability of a structure and ensures the sampling accuracy of temperature measurement.

Description

Battery cells, battery modules, battery packs and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202422911387.8, filed with the Chinese Patent Office on November 27, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a battery cell, battery module, battery pack, and electrical device. Background Technology

[0003] In related technologies, new energy vehicles primarily use electricity as their energy source and batteries as their energy storage medium. As the core component of the battery pack, the temperature changes of the battery cell assembly can affect the safety of new energy vehicles; therefore, temperature monitoring of the battery cell assembly is particularly important. Invention Overview

[0004] The existing temperature sampling structure has unstable connections and low temperature sampling accuracy.

[0005] An embodiment of this application provides a battery cell, the battery cell comprising:

[0006] Single cell:

[0007] A temperature detection component includes a cell support and a temperature detector. A single cell is fixed to the cell support, and the cell support has a receiving groove. The temperature detector is at least partially located in the receiving groove for collecting temperature data of the single cell.

[0008] This application also provides a battery module, the battery module comprising:

[0009] Multiple battery cell units, at least some of which are the aforementioned battery cells;

[0010] CCS assembly, wherein the CCS assembly is used to connect multiple battery cell units in series;

[0011] A data acquisition unit, located on one side of the CCS assembly and connected to a temperature detector, is used to acquire temperature data of the battery cell unit.

[0012] This application also provides a battery pack, the battery pack comprising:

[0013] Box;

[0014] At least two battery modules are arranged at intervals along a first direction, and at least two of the battery modules are disposed within a housing.

[0015] This application also provides an electrical device, including a battery pack. Beneficial effects

[0016] This application provides a battery cell, which includes a battery cell unit and a temperature detection component. The temperature detection component includes a battery cell support and a temperature detector. The battery cell support is fixed to the battery cell unit and has a receiving groove. The temperature detector is at least partially disposed in the receiving groove. Compared with the prior art, where the temperature detector is easy to fall off, this application improves the reliability of the structure, avoids the temperature detector falling off, and ensures the sampling accuracy of temperature detection. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the structure of the battery module provided in an embodiment of this application;

[0018] Figure 2 is a schematic diagram of the structure of the battery module provided in an embodiment of this application;

[0019] Figure 3 is an enlarged schematic diagram of part A of the embodiment shown in Figure 2;

[0020] Figure 4 is a partial enlarged structural schematic diagram of the embodiment shown in Figure 3;

[0021] Figure 5 is a top view of the battery module provided in an embodiment of this application;

[0022] Figure 6 is a schematic diagram of the structure of the battery module provided in the embodiment of this application;

[0023] Figure 7 is an enlarged schematic diagram of part B of the embodiment shown in Figure 6.

[0024] Explanation of reference numerals in the attached figures:

[0025] 100. Battery cells;

[0026] 10. Individual cell; 11. Battery body; 111. Top side; 112. Peripheral side; 12. Terminal post;

[0027] 20. Temperature detection component; 21. Cell support; 211. Fixing part; 212. Receiving part; 2120. Receiving groove; 2121. Base plate; 2122. Claw; 2123. Connecting arm; 2124. Hook; 22. Temperature detector;

[0028] 200. Battery module; 201. CCS assembly; 2011. FPC; 2012. First section; 2013. Second section; 2014. CCS bracket; 2015. Connecting busbar; 2016. Bending section; 202. Data acquisition component; 203. First busbar; 204. Second busbar; 205. High voltage box. Embodiments of the present invention

[0029] Please refer to Figures 1-3. Figure 1 is a schematic diagram of the battery module structure provided in an embodiment of this application. Figure 2 is a schematic diagram of the battery module structure provided in an embodiment of this application. Figure 3 is an enlarged schematic diagram of part A of the embodiment shown in Figure 2. This application provides a battery cell 100. The battery cell is the basic unit that makes up the battery pack, and it is responsible for storing and releasing electrical energy. Please continue to refer to Figure 4. Figure 4 is an enlarged schematic diagram of part of the structure of the embodiment shown in Figure 3, specifically a schematic diagram of the structure in Figure 3 without the CCS bracket 2014. The battery cell 100 includes a single battery cell 10 and a temperature detection component 20. The temperature detection component 20 includes a battery cell bracket 21 and a temperature detector 22. The battery cell bracket 21 is fixed to the single battery cell 10 and has a receiving groove 2120. The temperature detector 22 is at least partially disposed in the receiving groove 2120 and configured to collect the temperature data of the single battery cell 10.

[0030] In the prior art, since the temperature detection structure is usually located on the sampling harness, the temperature detector 22 is prone to detachment during assembly or normal use of the equipment, reducing the accuracy of temperature sampling. This application, however, fixes the temperature detector 22 with the battery cell bracket 21, improving the reliability of the structure, preventing the temperature detector 22 from detaching, and ensuring the sampling accuracy of temperature detection.

[0031] In some examples, the temperature detector 22 is an NTC (Negative Temperature Coefficient thermistor), which is an electronic component whose resistance decreases as temperature increases. It is widely used in applications such as temperature measurement and temperature compensation. It has good temperature sensitivity; its resistance decreases as temperature rises, enabling it to respond quickly to temperature changes and making it suitable for real-time temperature monitoring.

[0032] In some examples, the cell support 21 is made of plastic, such as PC, ABS, PA, etc. Its main function is to fix the individual cell 10. The plastic support has good insulation properties, which can effectively prevent current leakage and ensure safety. In addition, the plastic support has a certain degree of flexibility, which can effectively absorb vibration and impact and protect the battery and its components.

[0033] In some embodiments, the battery cell 10 includes a body 11 and an electrode post 12. The body 11 includes a top side 111 and a peripheral side 112 surrounding the periphery of the top side 111. The top side 111 and the electrode post 12 are connected, and a temperature detection component 20 is connected to the peripheral side 112 near the top of the top side 111. It is understood that during the charging and discharging process, the top side 111 is usually the area with the highest heat concentration. Therefore, monitoring the temperature here can more accurately reflect the overall state of the battery, and the top side 111 is easier to arrange related detection lines, effectively utilizing space.

[0034] In some embodiments, the battery cell support 21 includes a fixing portion 211 and a receiving portion 212. The fixing portion 211 forms a mounting groove that is adapted to the peripheral side 112 of the body 11. The body 11 is snapped into the mounting groove. The receiving portion 212 protrudes from the side of the fixing portion 211 away from the body 11 and is provided with a receiving groove 2120.

[0035] In some embodiments, the body 11 is a cylinder, with an arc structure adapted to the cylinder.

[0036] Understandably, cylindrical battery cells 100 typically offer high energy density, making them suitable for applications requiring long battery life. However, in the prior art, the contact area between the cylindrical battery cell and the temperature detector 22 is relatively small, making the arrangement of the temperature detector 22 and temperature acquisition difficult, resulting in poor temperature detection of the battery cell 100. In this embodiment, the cylindrical fit between the fixing part 211 and the body 11 ensures the fixation of the temperature acquisition element 202 on the battery cell 10, improving the temperature acquisition effect.

[0037] In some examples, each individual cell 10 of cell 100 is a cylindrical cell. Cell 100 can also be a prismatic cell, a hybrid prismatic and cylindrical cell, etc.

[0038] In some examples, the battery cell 10 is snapped into the fixing part 211. When the fixing part 211 is snapped into the battery cell 10, the fixing part 211 can produce a certain elastic deformation to adapt to the size of the cylindrical battery cell 100. The snap-fit ​​structure is convenient to disassemble and assemble, and occupies little space, which helps to improve the compactness of the design.

[0039] In some embodiments, the receiving portion 212 includes a base plate 2121 and a claw 2122. The claw 2122 is spaced apart from the fixing portion 211. The base plate 2121 is connected between the fixing portion 211 and the claw 2122. The claw 2122, the base plate 2121, and a portion of the fixing portion 211 form a receiving groove 2120. It is understood that if the surface of the temperature detector 22 is not protected, the temperature detector 22 is easily damaged, reducing its service life. The claw 2122, the base plate 2121, and the portion of the fixing portion 211 facing the claw 2122 form a receiving groove 2120. The temperature detector 22 is disposed in the receiving groove 2120, which can improve the overall protection of the temperature detector 22.

[0040] In some embodiments, the claw 2122 includes a connecting arm 2123 and a hook 2124. The connecting arm 2123 is connected to the base plate 2121, and the hook 2124 is connected to the end of the connecting arm 2123 away from the base plate 2121, and the hook 2124 is hooked to the temperature detector 22.

[0041] In some examples, the connecting arm 2123 can be an elastic structure that can expand moderately when the temperature detector 22 is installed in the receiving slot 2120 and eventually snap into the temperature detector 22 to accommodate different shapes and sizes of the temperature detector 22.

[0042] In some examples, the receiving part 212 includes a plurality of claws 2122 arranged in parallel. The fixing part 211 has a relief groove on the side facing the claws 2122. The relief groove is connected to the receiving groove 2120. The temperature detector 22 is partially disposed in the relief groove. The relief groove can increase the receiving space of the temperature detector 22.

[0043] Please refer to Figures 5-7 in conjunction with Figure 1. Figure 5 is a top view of the battery module provided in an embodiment of this application. Figure 6 is a structural schematic diagram of the battery module provided in an embodiment of this application. Figure 7 is an enlarged schematic diagram of part B of the embodiment shown in Figure 6. This application also provides a battery module 200, which includes multiple battery cell units, a CCS assembly 201, and a data acquisition unit 202. At least some of the battery cell units are the battery cells 100 as described above. The CCS (Cell Connection System) is a key component configured to connect and manage battery cells, and it plays a role in connection, protection, and monitoring in the battery pack. The CCS assembly 201 is configured to connect multiple battery cells 100 in series. The data acquisition unit 202 is located on one side of the CCS assembly 201 and is connected to a temperature detector 22, configured to collect temperature data of the battery cells 100.

[0044] In some examples, multiple cell units form multiple cell columns, and adjacent cell columns can be connected by a series busbar, which can be a composite copper-aluminum busbar. The first cell unit in each column is cell 100, and the temperature detection component obtains the temperature of each column of cell units by measuring the temperature of each column of cell 100.

[0045] In some examples, the acquisition unit 202 can be a BIC (Battery Information Collector). Its main functions include battery temperature sampling, voltage sampling, battery equalization, and sampling line anomaly detection. By acquiring battery temperature and voltage information, battery status can be monitored and controlled.

[0046] In some embodiments, the CCS assembly 201 includes an FPC 2011, a CCS bracket 2014, and a connecting strip 2015. The connecting strip 2015 is configured to connect multiple battery cells in series, and the CCS bracket 2014 is configured to fix the connecting strip 2015. The FPC 2011 (Flexible Printed Circuit) can be bent and folded to adapt to complex spatial layouts, compared to traditional rigid circuit boards. The FPC 2011 includes a first segment 2012 and a second segment 2013. The first segment 2012 is connected to a temperature detector, and the second segment 2013 is connected to the connecting strip 2015, configured to collect the voltage of the battery cell 100. The first segment 2012 includes a first connector, and the second segment 2013 includes a second connector. The first connector and the second connector are interlocked on one side of the battery cell 100, so that temperature and voltage information can be transmitted to the acquisition element 202.

[0047] Specifically, the first segment 2012 and the second segment 2013 are connected to different positions of the battery module 200. The first segment 2012 is installed on the side of the CCS bracket 2014 away from the cell unit and has a large connection area with the CCS bracket 2014, resulting in good structural stability. The second segment 2013 is located at the bottom of the CCS bracket 2014 and lacks a corresponding support structure. The first segment 2012 and the second segment 2013 are interlocked, which can increase the structural strength of the first segment 2012 and reduce the number of FPC2011 used, thus avoiding the overlap of FPC2011 used for temperature detection and voltage detection.

[0048] In some embodiments, one end of the first segment 2012 is provided with a bent portion 2016. The end of the temperature detector 22 away from the receiving groove 2120 is engaged in the bent portion 2016, and the other end of the first segment 2012 is connected to the acquisition member 202. The bent portion 2016 of the FPC 2011 forms a groove adapted to the temperature detector 22, and the end of the temperature detector 22 away from the receiving groove 2120 is disposed in the groove to prevent the temperature detector 22 from displacing.

[0049] In some examples, the FPC2011 has multiple nickel strips, each configured to be electrically connected to a battery cell to collect the voltage signal of each battery cell. The battery module 200 also includes a high-voltage box 205, a low-voltage connector, and positive and negative copper busbars. The FPC collects the high-voltage signal and the temperature signal detected by the temperature detector 22. The low-voltage signal and the temperature signal are transmitted to the low-voltage connector via the BIC and then to the BMS (Battery Management System). The high-voltage signal is transmitted to the high-voltage box 205 via the positive and negative copper busbars. The BIC wiring harness is connected to the high-voltage box 205, and after collecting the high-voltage signal, it is transmitted to the BMS via the low-voltage connector.

[0050] In some examples, the connection bar 2015 includes two connecting tabs connected in series. Each connecting tab connects to a cell unit in a different column of the same battery module 200. The first end of each connecting tab is configured to connect to the positive terminal of a cell unit, and the second end of each connecting tab is configured to connect to the negative terminal of an adjacent cell unit. Any connecting tab connects adjacent cell units in series via its first and second ends to connect cell units in the same column together. The two connecting tabs of the same connection bar 2015 connect cell units in different columns of the same battery module 200 in parallel. The connection bar 2015 connects multiple cell units of the same battery module 200 in series and parallel to complete the connection of the cell units via the CCS component 201.

[0051] This application also provides a battery pack, which includes a housing and battery modules 200. At least two battery modules 200 are disposed within the housing and spaced apart along a first direction. Specifically, the first direction can be vertical. The two battery modules 200 are stacked, and the stacked battery modules 200 are connected by support columns to form a double-layer structure. Multiple double-layer battery module structures 200 can be disposed within the housing. The double-layer structure can store more energy within the same housing volume, extending the usage time and improving the battery life of the electrical equipment.

[0052] In some examples, the battery module 200 is fixed to the housing with expanding foam, which has good thermal insulation and corrosion resistance, helping to control the battery temperature and prevent corrosive substances generated during battery charging and discharging from affecting it.

[0053] In some examples, the acquisition component 202 can be fixed to the housing by rivets. Fixing the acquisition component 202 to the housing can reduce the number of connectors and wiring harnesses, thereby reducing weight. At the same time, it can also reduce the number of processes and save costs.

[0054] In some examples, the battery module 200 also includes a Battery Distribution Unit (BDU), which is a crucial component of the battery and primarily used to manage and distribute the battery pack's power. The battery module 200 also includes two first busbars 203 and two second busbars 204. One end of one first busbar 203 is connected to the rear-drive positive terminal on the high-voltage box 205, and one end of the other first busbar 203 is connected to the rear-drive negative terminal on the high-voltage box 205. The other ends of both first busbars 203 are connected to the BDU. One end of one second busbar 204 is connected to the fast-charging positive terminal on the high-voltage box 205, and one end of the other second busbar 204 is connected to the fast-charging negative terminal on the high-voltage box 205. The other ends of both second busbars 204 are connected to the BDU. The BDU is directly connected to the front-drive connector to reduce busbar costs and ensure energy input and output of the battery system in electrical devices such as electric vehicles.

[0055] This application also provides an electrical device, including the battery pack described above. The electrical device can be an electric vehicle, power tool, electric bicycle, energy storage system, drone, mobile device, etc.

[0056] In some examples, the electrical equipment is an electric vehicle. Understandably, the power battery is the core of an electric vehicle, providing driving power. Some vehicles, such as high-performance off-road vehicles, experience complex road conditions and frequent collisions, leading to potential errors in temperature sampling. The battery pack provided in this application, by setting a cell bracket 21 on the individual cell 10 of the cell 100, can measure temperature more accurately and reduce temperature measurement obstacles caused by road conditions.

Claims

1. A battery cell (100), the battery cell comprising: Battery cell (10): The temperature detection component (20) includes a cell support (21) and a temperature detector (22). The cell unit (10) is fixed to the cell support (21). The cell support is provided with a receiving groove (2120). The temperature detector (22) is at least partially disposed in the receiving groove (2120) and configured to collect temperature data of the cell unit (10).

2. The battery cell (100) according to claim 1, wherein, The battery cell (10) includes a body (11) and a terminal (12). The body (11) includes a top side (111) and a peripheral side surrounding the periphery of the top side (111). The top side (111) and the terminal (12) are connected. The temperature detection component (20) is connected to the peripheral side near the top of the top side (111).

3. The battery cell (100) according to claim 2, wherein, The battery cell bracket (21) includes a fixing part (211) and a receiving part (212). The fixing part (211) forms a mounting groove that is adapted to the periphery of the body (11). The body (11) is snapped into the mounting groove. The receiving part (212) protrudes from the fixing part (211) on the side away from the body (11). The receiving part (212) is provided with the receiving groove (2120).

4. The battery cell (100) according to claim 3, wherein, The main body (11) is a cylinder, and the fixing part (211) is an arc structure, which is adapted to the cylinder.

5. The battery cell (100) according to claim 3, wherein, The receiving portion (212) includes a base plate (2121) and a claw (2122). The claw (2122) is spaced apart from the fixing portion (211). The base plate (2121) is connected between the fixing portion (211) and the claw (2122). The claw (2122), the base plate (2121), and part of the fixing portion (211) form the receiving groove (2120).

6. The battery cell (100) according to claim 5, wherein, The claw (2122) includes a connecting arm (2123) and a hook (2124). The connecting arm (2123) is connected to the base plate (2121), and the hook (2124) is connected to the end of the connecting arm (2123) away from the base plate (2121). The hook (2124) is hooked onto the temperature detector (22).

7. A battery module (200), the battery module (200) comprising: Multiple battery cell units, at least some of which are battery cells (100) as described in any one of claims 1-6. CCS component (201) is configured to connect multiple said cell units in series; A data acquisition unit is located on one side of the CCS component (201) and connected to the temperature detector (22), the data acquisition unit being configured to acquire temperature data of the battery cell unit.

8. A battery module (200) according to claim 7, wherein, The CCS (202) assembly includes an FPC (2011), a CCS bracket (2014), and a connecting bar (2015). The connecting bar (2015) is configured to connect multiple battery cells in series. The CCS bracket (2014) is configured to fix the connecting bar (2015). The FPC (2011) includes a first segment (2012) and a second segment (2013). The first segment (2012) is connected to the temperature detector (22), and the second segment (2013) is connected to the connecting bar (2015) and configured to collect the voltage of the battery cells. The first segment (2012) includes a first connector, and the second segment (2013) includes a second connector. The first connector and the second connector are plugged into each other on one side of the battery cells.

9. A battery module (200) according to claim 8, wherein, One end of the first segment (2012) is provided with a bend (2016), and the end of the temperature detector (22) away from the receiving groove (2120) is snapped into the bend (2016), and the other end of the first segment (2012) is connected to the acquisition element.

10. A battery pack, the battery pack comprising: Box; At least two battery modules (200) as described in any one of claims 7-9, wherein at least two of the battery modules are disposed in the housing and spaced apart along a first direction.

11. An electrical appliance comprising the battery pack as claimed in claim 10.

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