Battery cell, battery module, battery pack and electric equipment

Abstract

The utility model provides a battery cell, a battery module, a battery pack and electric equipment, the battery cell comprises a battery cell single body and a temperature detection assembly, the temperature detection assembly comprises a battery cell support and a temperature detector, the battery cell support is fixed on the battery cell single body, the battery cell support is provided with a containing groove, the temperature detector is at least partially arranged in the containing groove, and the temperature detector is arranged in the containing groove. Compared with the prior art that the temperature detector is easy to fall off, the structure reliability is improved, the temperature detector is prevented from falling off, and the sampling precision of temperature detection is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery cell, a battery module, a battery pack and a power consumption device. BACKGROUND

[0002] In related technologies, new energy vehicles mostly use electric energy as energy, and use batteries as storage media of electric energy. The temperature change of a battery cell assembly as a core component of a battery pack will affect the safety of a new energy vehicle, so the detection of the temperature of the battery cell assembly is particularly important. The existing temperature sampling structure is not stable in connection, and the temperature sampling precision is low. CONTENT OF THE UTILITY MODEL

[0003] Embodiments of the present application provide a battery cell, a battery module, a battery pack and a power consumption device, which can improve the technical problem of low temperature sampling precision of the existing battery cell.

[0004] In a first aspect, embodiments of the present application provide a battery cell, comprising:

[0005] The battery cell comprises:

[0006] A temperature detection assembly comprising a battery cell support and a temperature detector, the battery cell is fixed to the battery cell support, the battery cell support is provided with a receiving groove, and the temperature detector is at least partially arranged in the receiving groove and used to collect temperature data of the battery cell.

[0007] In some embodiments, the battery cell comprises a body and a pole, the body comprises a top side and a circumferential side surrounding a periphery of the top side, the top side is connected to the pole, and the circumferential side close to a top of the top side is connected to the temperature detection assembly.

[0008] In some embodiments, the battery cell support comprises a fixing part and a receiving part, the fixing part forms a mounting groove matched with the circumferential side of the body, the body is clamped in the mounting groove, and the receiving part is protruded from a side of the fixing part away from the body, and the receiving part is provided with the receiving groove.

[0009] In some embodiments, the body is a cylinder, and the fixing part is an arc structure matched with the cylinder.

[0010] In some embodiments, the receiving part comprises a bottom plate and a clamping jaw, the clamping jaw is arranged in a spaced manner with the fixing part, the bottom plate is connected between the fixing part and the clamping jaw, and the clamping jaw, the bottom plate and part of the fixing part form the receiving groove.

[0011] In some embodiments, the clamping jaw comprises a connecting arm and a clamping hook, the connecting arm is connected to the bottom plate, the clamping hook is connected to an end of the connecting arm away from the bottom plate, and the clamping hook hooks the temperature detector.

[0012] The application also provides a battery module, which comprises:

[0013] a plurality of battery cell units, at least part of the battery cell units being the battery cell as described above;

[0014] a CCS assembly for connecting the plurality of battery cell units in series;

[0015] a collection member located at one side of the CCS assembly and connected to the temperature detector, the collection member being used for collecting temperature data of the battery cell units.

[0016] In some embodiments, the CCS assembly comprises an FPC, a CCS support and a connecting row, the connecting row being used for connecting the plurality of battery cell units in series, the CCS support being used for fixing the connecting row, the FPC comprising a first section and a second section, the first section being connected to the temperature detector, the second section being connected to the connecting row and being used for collecting voltage of the battery cell units, the first section comprising a first connector, the second section comprising a second connector, the first connector and the second connector being inserted into each other at one side of the battery cell.

[0017] In some embodiments, one end of the first section is provided with a bending part, the temperature detector is clamped into the bending part away from one end of the accommodating groove, and the other end of the first section is connected to the collection member.

[0018] The application also provides a battery pack, which comprises:

[0019] a box;

[0020] at least two battery modules as described above, the at least two battery modules being arranged at intervals along a first direction, and the at least two battery modules being arranged in the box.

[0021] The application also provides a power consumption device comprising the battery pack as described above.

[0022] The application has the following beneficial effects:

[0023] The application provides an electric core, which comprises an electric core monomer and a temperature detection assembly, the temperature detection assembly comprises an electric core support and a temperature detector, the electric core support is fixed to the electric core monomer, the electric core support is provided with a containing groove, and the temperature detector is arranged at least partially in the containing groove; compared with the temperature detector in the prior art, the temperature detector is not easy to fall off, the reliability of the structure is improved, the falling off of the temperature detector is avoided, and the sampling precision of temperature detection is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0025] Figure 1 is a structural schematic diagram of a battery module provided by the embodiment of the application Figure 1 ;

[0026] Figure 2 is a structural schematic diagram of a battery module provided by the embodiment of the application Figure 2 ;

[0027] Figure 3 is an enlarged schematic diagram of part A of the embodiment shown in Figure 2 ;

[0028] Figure 4 is an enlarged schematic diagram of part structure of the embodiment shown in Figure 3 ;

[0029] Figure 5 is a top view of a battery module provided by the embodiment of the application

[0030] Figure 6 is a structural schematic diagram of a battery module provided by the embodiment of the application Figure 3 ;

[0031] Figure 7 is an enlarged schematic diagram of part C of the embodiment shown in Figure 6 .

[0032] Reference signs:

[0033] 100, electric core;

[0034] 10, electric core monomer; 11, body; 111, top side; 112, peripheral side; 12, pole post;

[0035] 20, temperature detection assembly; 21, cell holder; 211, fixed part; 212, accommodating part; 2120, accommodating groove; 2121, bottom plate; 2122, clamping jaw; 2123, connecting arm; 2124, clamping hook; 22, temperature detector;

[0036] 200, battery module; 201, CCS assembly; 2011, FPC; 2012, first section; 2013, second section; 2014, CCS holder; 2015, connecting row; 2016, bending part; 202, collecting piece; 203, first busbar; 204, second busbar; 205, high-voltage box. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0038] Please refer to Figures 1-3 , Figure 1 is a structural schematic diagram of a battery module provided by an embodiment of the present application Figure 1 , Figure 2 is a structural schematic diagram of a battery module provided by an embodiment of the present application Figure 2 , Figure 3 is Figure 2 is an enlarged schematic diagram of part A of the embodiment shown in Figure 4 , Figure 4 is an enlarged schematic diagram of part of the structure of the embodiment shown in Figure 3 , specifically Figure 3 is a schematic diagram of the structure with the CCS holder 2014 removed. The cell 100 includes a cell monomer 10 and a temperature detection assembly 20. The temperature detection assembly 20 includes a cell holder 21 and a temperature detector 22. The cell holder 21 is fixed to the cell monomer 10. The cell holder 21 is provided with an accommodating groove 2120. The temperature detector 22 is at least partially arranged in the accommodating groove 2120, and is used to collect temperature data of the cell monomer 10.

[0039] In the prior art, since the temperature detection structure is usually arranged on the sampling wire harness, the temperature detector 22 is prone to falling off during assembly or normal use of the electrical equipment, thereby reducing the accuracy of temperature sampling. The temperature detector 22 is fixed by the battery cell support 21, the reliability of the structure is improved, the falling off of the temperature detector 22 is avoided, and the sampling accuracy of temperature detection is ensured.

[0040] In some examples, the temperature detector 22 is an NTC (Negative Temperature Coefficient thermistor), that is, a negative temperature coefficient thermistor. The NTC is an electronic component whose resistance decreases with temperature rise and is widely used in temperature measurement and temperature compensation applications. It has good temperature sensitivity, and its resistance value decreases when the temperature rises, can quickly respond to temperature changes, and is suitable for real-time temperature monitoring.

[0041] In some examples, the material of the battery cell support 21 is plastic, which can be PC, ABS, PA, etc. The main function of the plastic is to fix the battery cell 10. The plastic support has good insulation performance, can effectively prevent current leakage, ensures safety, and has a certain flexibility, can effectively absorb vibration and impact, and protects the battery and its components.

[0042] In some examples, the battery cell 10 includes a body 11 and a pole 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 is connected to the pole 12, and the peripheral side 112 is connected to the temperature detection assembly 20 near the top of the top side 111. It can be understood that during charging and discharging, the top side 111 is usually the area where heat is most concentrated, so monitoring the temperature here can more accurately reflect the overall state of the battery, and the top side 111 is more easily arranged with related detection lines, which can effectively utilize space.

[0043] In some examples, the battery cell support 21 includes a fixing part 211 and a containing part 212. The fixing part 211 forms a mounting groove adapted to the peripheral side 112 of the body 11, and the body 11 is clamped in the mounting groove. The containing part 212 is protruded from the side of the fixing part 211 away from the body 11, and the containing part 212 is provided with the containing groove 2120.

[0044] In some examples, the body 11 is a cylinder, and the arc structure is adapted to the cylinder.

[0045] It can be understood that the cylindrical battery cell 100 can generally provide a higher energy density, which is suitable for applications requiring long endurance. However, the contact area between the cylindrical battery cell and the temperature detector 22 in the prior art is small, and the arrangement of the temperature detector 22 and the collection of the temperature are difficult, which makes the temperature detection effect of the battery cell 100 poor. In the embodiment, the cylindrical shape of the fixing part 211 and the body 11 can ensure the fixation of the temperature collection piece 202 on the battery cell monomer 10 and improve the collection effect of the temperature.

[0046] In some examples, each battery cell monomer 10 of the battery cell 100 is a cylindrical battery cell. The battery cell 100 can also be a square battery cell, a square and cylindrical hybrid battery cell, etc.

[0047] In some examples, the battery cell monomer 10 is clamped to the fixing part 211. When the fixing part 211 is clamped to the battery cell monomer 10, the fixing part 211 can produce a certain elastic deformation to adapt to the size of the cylindrical battery cell 100. The clamping structure is convenient to disassemble and occupies small space, which helps to improve the compactness of the design.

[0048] In some embodiments, the accommodating part 212 includes a bottom plate 2121 and a clamping jaw 2122, the clamping jaw 2122 is arranged in a spaced manner with the fixing part 211, the bottom plate 2121 is connected between the fixing part 211 and the clamping jaw 2122, and the clamping jaw 2122, the bottom plate 2121 and part of the fixing part 211 form the accommodating groove 2120. It can be understood that if the surface of the temperature detector 22 is not protected, the temperature detector 22 is easily damaged, which reduces the service life of the temperature detector 22. The clamping jaw 2122, the bottom plate 2121 and the part of the fixing part 211 towards the clamping jaw 2122 form the accommodating groove 2120, and the temperature detector 22 is arranged in the accommodating groove 2120, which can improve the protection effect of the whole temperature detector 22.

[0049] In some embodiments, the clamping jaw 2122 includes a connecting arm 2123 and a clamping hook 2124, the connecting arm 2123 is connected to the bottom plate 2121, the clamping hook 2124 is connected to one end of the connecting arm 2123 away from the bottom plate 2121, and the clamping hook 2124 hooks the temperature detector 22.

[0050] In some examples, the connecting arm 2123 can be an elastic structure. When the temperature detector 22 is installed in the accommodating groove 2120, the connecting arm 2123 can be moderately expanded and finally clamped to the temperature detector 22 to adapt to different shapes and sizes of the temperature detector 22.

[0051] In some examples, the accommodation portion 212 includes a plurality of clamping jaws 2122 arranged side by side, and the fixing portion 211 is provided with a relief groove on the side facing the clamping jaws 2122, the relief groove is communicated with the accommodation groove 2120, and the temperature detector 22 is partially arranged in the relief groove. The relief groove can increase the accommodation space of the temperature detector 22.

[0052] Please refer to Figure 1 Reference Figures 5-7 , Figure 5 is a top view of a battery module provided by an embodiment of the application, Figure 6 is a structural schematic diagram of a battery module provided by an embodiment of the application Figure 3 , Figure 7 is Figure 6 is an enlarged schematic diagram of part C of the embodiment shown in FIG. 1. The application also provides a battery module 200, which includes a plurality of battery cell units, a CCS assembly 201, and a collection member 202. At least part of the battery cell units are the battery cell 100 as described above. The CCS (Cell Connection System) is a battery cell connection system, which is a key component for connecting and managing battery cells. It plays a role of connection, protection, and monitoring in the battery pack. The CCS assembly 201 is used to connect a plurality of battery cells 100 in series. The collection member 202 is located on one side of the CCS assembly 201, and is connected to the temperature detector 22 for collecting temperature data of the battery cell 100.

[0053] In some examples, the plurality of battery cell units form a plurality of battery cell columns, and adjacent battery cell columns can be connected through a series connection row. The series connection row can be a composite copper-aluminum row. The first battery cell unit of each battery cell column is the battery cell 100. The temperature detection assembly measures the temperature of each battery cell column 100 to obtain the temperature of each battery cell column.

[0054] In some examples, the collection member 202 can be a BIC (Battery Information Collector), i.e., a battery information collector. Its main functions include battery temperature sampling, voltage sampling, battery balancing, and sampling line anomaly detection, etc. By collecting the temperature and voltage information of the battery, the monitoring and control of the battery state can be realized.

[0055] In some embodiments, the CCS assembly 201 comprises a FPC 2011, a CCS bracket 2014 and a connecting strip 2015 for connecting a plurality of the battery cells in series, and the CCS bracket 2014 is used for fixing the connecting strip 2015. The FPC 2011 (Flexible Printed Circuit) can be bent and folded to adapt to complex spatial layout, compared with the traditional rigid circuit board. The FPC 2011 comprises a first segment 2012 and a second segment 2013, the first segment 2012 is connected to the temperature detector, and the second segment 2013 is connected to the connecting strip 2015 for collecting the voltage of the battery cell 100. The first segment 2012 comprises a first connector, and the second segment 2013 comprises a second connector. The first connector and the second connector are inserted into each other at one side of the battery cell 100, so that the temperature and voltage information can be transmitted to the collection device 202.

[0056] 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 battery cell unit, and the CCS bracket 2014 has a large connection area and good structural stability. The second segment 2013 is arranged at the bottom of the CCS bracket 2014, which lacks a corresponding support structure. The first segment 2012 and the second segment 2013 are inserted into each other, which can increase the structural strength of the first segment 2012, reduce the use amount of the FPC 2011, and avoid the overlapping of the FPC 2011 for temperature detection and voltage detection.

[0057] In some embodiments, one end of the first segment 2012 is provided with a bending part 2016. The temperature detector 22 is clamped in the bending part 2016 away from one end of the accommodating groove 2120, and the other end of the first segment 2012 is connected to the collection device 202. The bending part 2016 of the FPC 2011 forms a groove matched with the temperature detector 22, and the end of the temperature detector 22 away from the accommodating groove 2120 is arranged in the groove to block the displacement of the temperature detector 22.

[0058] In some examples, the FPC 2011 is provided with a plurality of nickel sheets, each of which is used to electrically connect with one battery cell unit to collect the voltage signal of each battery cell unit. The battery module 200 further comprises a high-voltage box 205, a low-voltage connector, and positive and negative copper bars. The high-voltage signal collected by the FPC and the temperature signal detected by the temperature detector 22 are transmitted to the low-voltage connector and then to the BMS (Battery Management System), i.e., the battery management system, and the high-voltage signal is transmitted to the high-voltage box 205 through the positive and negative copper bars. The BIC part of the wire harness is connected to the high-voltage box 205, collects the high-voltage signal, and then transmits it to the BMS through the low-voltage connector.

[0059] In some examples, the connection bar 2015 comprises two connection sheets connected in series, and the two connection sheets are connected to the battery cell units in different columns of the same battery module 200. The first end of each of the two connection sheets is configured to connect the positive electrode of the battery cell unit, and the second end of each of the two connection sheets is configured to connect the negative electrode of the adjacent battery cell unit. Any connection sheet connects the adjacent battery cell units in series through its first end and second end to connect the battery cell units in the same column together, and the two connection sheets of the same connection bar 2015 connect the battery cell units in different columns of the same battery module 200 in parallel, so that the connection bar 2015 connects the plurality of battery cell units of the same battery module 200 in series and parallel to complete the connection of the battery cell units through the CCS assembly 201.

[0060] The application also provides a battery pack comprising a box body and the aforementioned battery module 200. At least two battery modules 200 are arranged in the box body and are arranged in a first direction. Specifically, the first direction can be a vertical direction, and the two battery modules 200 are arranged in a stacked manner and are connected by support columns between the stacked battery modules 200 to form a double-layer structure. A plurality of double-layer battery module 200 structures can be arranged in the box body, and the double-layer structure can store more energy in the same box volume and prolong the use time to improve the endurance of the power equipment.

[0061] In some examples, the battery module 200 is fixed in the box body by foaming glue, which has good thermal insulation properties and corrosion resistance, can help control the temperature of the battery, and can prevent the influence of corrosive substances generated during the charging and discharging of the battery.

[0062] In some examples, the collecting member 202 can be fixed to the box body by rivets. Fixing the collecting member 202 to the box body can reduce the connectors and wire harnesses to reduce the weight, and can also reduce the process and save the cost.

[0063] In some examples, the battery module 200 further comprises a BDU (Battery Distribution Unit), which is an important component in the battery system and is mainly used for managing and distributing the power of the battery pack. The battery module 200 further comprises two first busbars 203 and two second busbars 204. One end of one first busbar 203 is connected to the rear drive positive electrode on the high-voltage box 205, and the other end of the first busbar 203 is connected to the rear drive negative electrode on the high-voltage box 205. The other end of the two first busbars 203 is connected to the BDU. One end of one second busbar 204 is connected to the fast charging positive electrode on the high-voltage box 205, and the other end of the second busbar 204 is connected to the fast charging negative electrode on the high-voltage box 205. The other end of the two second busbars 204 is connected to the BDU. The BDU is directly connected to the front drive connector, so as to reduce the cost of the busbar and ensure the energy input and output of the battery system in the electric equipment such as the electric vehicle.

[0064] The application also provides an electric equipment comprising the battery pack as described above. The electric equipment can be an electric vehicle, an electric tool, an electric bicycle, an energy storage system, a drone, a mobile device, etc.

[0065] In some examples, the electric equipment is an electric vehicle. It can be understood that the power battery is the core of the electric vehicle and can provide driving power for the electric vehicle. Some vehicles such as high-performance off-road vehicles have complex driving conditions and are prone to collisions, which can cause errors in temperature sampling. The battery pack provided by the application can more accurately measure the temperature by arranging the battery cell support 21 on the battery cell monomer 10 of the battery cell 100, thereby reducing the temperature measurement obstacles caused by road conditions.

[0066] The above describes the embodiments of the application in detail. The specific examples are applied to the principles and implementation modes of the application, and the above examples are used to help understand the method and core idea of the application. Meanwhile, for those skilled in the art, the specific implementation mode and application range can be changed according to the idea of the application. In summary, the content of the specification should not be understood as a limitation of the application.

Claims

1. An electric cell, characterized by, The battery cell comprises: The battery cell comprises: A temperature detection assembly comprises a battery cell holder and a temperature detector, the battery cell is fixed to the battery cell holder, the battery cell holder is provided with a receiving groove, and the temperature detector is at least partially arranged in the receiving groove and used to collect temperature data of the battery cell.

2. The electric cell of claim 1, wherein, The battery cell comprises a body and a pole, the body comprises a top side and a circumferential side surrounding a periphery of the top side, the top side is connected with the pole, and the circumferential side close to a top of the top side is connected with the temperature detection assembly.

3. The electric cell of claim 2, wherein, The battery cell holder comprises a fixing part and a receiving part, the fixing part forms a mounting groove matched with the circumferential side of the body, the body is clamped in the mounting groove, and the receiving part is protruded from a side of the fixing part away from the body, and the receiving part is provided with the receiving groove.

4. The electric cell of claim 3, wherein, The body is a cylinder, and the fixing part is an arc structure matched with the cylinder.

5. The electric cell of claim 3, wherein, The receiving part comprises a bottom plate and a clamping jaw, the clamping jaw is arranged in a spaced manner with the fixing part, the bottom plate is connected between the fixing part and the clamping jaw, and the clamping jaw, the bottom plate and part of the fixing part form the receiving groove.

6. The electric cell of claim 5, wherein, The clamping jaw comprises a connecting arm and a clamping hook, the connecting arm is connected to the bottom plate, the clamping hook is connected to an end of the connecting arm away from the bottom plate, and the clamping hook hooks the temperature detector.

7. A battery module, characterized by The battery module comprises: A plurality of battery cells, at least part of the battery cells are the battery cell as claimed in any one of claims 1-6; A CCS assembly used to connect the plurality of battery cells in series; A collection piece arranged on one side of the CCS assembly and connected to the temperature detector, and used to collect temperature data of the battery cells.

8. The battery module of claim 7, wherein, The CCS assembly comprises an FPC, a CCS holder and a connecting row, the connecting row is used to connect the plurality of battery cells in series, the CCS holder is used to fix the connecting row, the FPC comprises a first segment and a second segment, the first segment is connected to the temperature detector, the second segment is connected to the connecting row and used to collect voltage of the battery cells, the first segment comprises a first connector, the second segment comprises a second connector, and the first connector and the second connector are inserted into each other on one side of the battery cells.

9. The battery module of claim 8, wherein, One end of the first segment is provided with a bending part, an end of the temperature detector away from the receiving groove is clamped in the bending part, and the other end of the first segment is connected to the collection piece.

10. A battery pack, characterized by, The battery pack comprises: A box body; At least two battery modules as claimed in any one of claims 7-9, and the at least two battery modules are arranged in the box body and in a spaced manner along a first direction.

11. An electrical device, characterized by The power consumption device comprises the battery pack as claimed in claim 10.

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