Temperature acquisition assembly and battery

Abstract

The present application discloses a temperature acquisition assembly and a battery. The temperature acquisition assembly is arranged on the battery. The temperature acquisition assembly comprises a housing and at least one measurement member, one surface of the housing is attached onto a battery cell, the surface is provided with a recess, and the measurement member is arranged in the recess and abuts against the battery cell.

Description

Temperature acquisition assembly and battery

[0001] The present application claims priority to the Chinese patent application No. 202411322217.4 filed on September 20, 2024 with the China Patent Office, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a temperature acquisition assembly and a battery. BACKGROUND

[0003] Battery temperature acquisition is an important link in the battery management system (BMS), and its accuracy directly affects the safety and life of the battery.

[0004] In the related art, the temperature acquisition of the battery cell (such as a cylindrical battery cell) is performed by using a water droplet head type NTC (Negative Temperature Coefficient) thermistor. SUMMARY

[0005] However, the water droplet head type NTC is packaged by using epoxy resin, which results in a long thermal time constant and poor acquisition accuracy. Moreover, the water droplet head NTC has a circular arc shape, and it is placed on the surface of the battery cell in a line contact, which not only has poor firmness, but also has a large deviation between the acquired battery cell temperature and the actual temperature, and cannot accurately reflect the real temperature of the battery cell.

[0006] In a first aspect, the present application provides a temperature acquisition assembly, comprising:

[0007] a shell, one surface of the shell is attached to the battery cell, and the surface of the shell is provided with a groove; and

[0008] at least one measuring piece, which is arranged in the groove and abuts against the battery cell.

[0009] In a second aspect, the present application further provides a battery, comprising: a battery cell and the temperature acquisition assembly provided in the first aspect, and the temperature acquisition assembly is attached to the side surface of the battery cell. ADVANTAGEOUS EFFECTS

[0010] The battery provided by the present application is provided with a temperature acquisition assembly, which comprises a shell and at least one measuring piece. One surface of the shell is attached to the battery cell, and the surface is provided with a groove. The measuring piece is arranged in the groove and abuts against the battery cell. Thus, the measuring piece for acquiring the temperature of the battery cell can be firmly fixed on the battery cell, and the measuring piece can also abut against the battery cell, so that the temperature of the battery cell can be accurately acquired, and the accuracy of the temperature acquisition of the battery cell is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 is a connection diagram of a temperature acquisition assembly and an electric core according to the present application;

[0012] Fig. 2 is a structural schematic diagram of the temperature acquisition assembly according to the present application;

[0013] Fig. 3 is an exploded view of the temperature acquisition assembly according to the present application;

[0014] Fig. 4 is a structural schematic diagram of a measuring piece and an electrical connecting piece according to the present application;

[0015] Fig. 5 is another structural schematic diagram of the measuring piece and the electrical connecting piece according to the present application;

[0016] Fig. 6 is a structural schematic diagram of the measuring piece on a flexible circuit board according to the present application;

[0017] Fig. 7 is a structural schematic diagram of the connecting piece according to the present application;

[0018] Fig. 8 is a structural schematic diagram of a shell according to the present application;

[0019] Fig. 9 is another structural schematic diagram of the shell according to the present application;

[0020] Fig. 10 is a structural schematic diagram of a third reinforcing piece according to the present application;

[0021] Fig. 11 is a structural schematic diagram of a connector according to the present application;

[0022] Fig. 12 is a structural schematic diagram of a heat conducting piece according to the present application.

[0023] Reference signs:

[0024] 10 is an electric core, 210 is a shell, 211 is a groove, 212 is a second opening, 220 is a measuring piece, 221 is a first thermistor, 222 is a second thermistor, 230 is a connecting piece, 231 is a first opening, 240 is a heat conducting piece, 250 is an electrical connecting piece, 251 is a flexible circuit board, 2511 is a first connecting part, 2512 is a second connecting part, 252 is a connector, 2521 is a connecting point, 260 is a first reinforcing piece, 270 is a second reinforcing piece, 280 is a sealing piece, 290 is a third reinforcing piece, and 291 is a third opening. Embodiments of the present application

[0025] Please refer to Fig. 1, Fig. 2, Fig. 3 and Fig. 8, Fig. 1 is a connection diagram of a temperature acquisition assembly and an electric core according to the present application; Fig. 2 is a structural schematic diagram of the temperature acquisition assembly according to the present application; Fig. 3 is an exploded view of the temperature acquisition assembly according to the present application; and Fig. 8 is a structural schematic diagram of a shell according to the present application.

[0026] As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 8, the application provides a temperature collection assembly, which comprises:

[0027] a shell 210, a surface of the shell 210 is attached to the battery cell 10, and the surface of the shell 210 is provided with a groove 211; and

[0028] at least one measuring element 220, which is arranged in the groove 211 and abuts against the battery cell 10.

[0029] In the embodiment, the battery cell 10 can be a cylindrical battery cell. When the shell 210 is fixedly attached to the battery cell 10, the surface of the shell 210 that is attached to the battery cell 10 needs to be set according to the attachment position, which can not only simplify the fixing process of the temperature collection assembly, but also firmly fix the temperature collection assembly to the battery cell 10.

[0030] For example, if the shell 210 is fixedly attached to the side surface of the cylindrical battery cell, the surface of the shell 210, i.e. the attachment surface, can be set as a curved surface, so as to be more matched with the side surface of the cylindrical battery cell. If the shell 210 is attached to the side surface of the square battery cell, the surface of the shell 210, i.e. the attachment surface, can be set as a flat surface, which is also more matched with the side surface of the square battery cell.

[0031] It should be noted that the shell 210 can also be fixedly attached to the upper end surface or the lower end surface of the battery cell 10.

[0032] In some embodiments, since the temperature of the side surface of the battery cell 10 is closest to the internal temperature of the battery cell 10, the shell 210 can be fixedly attached to the side surface of the battery cell 10.

[0033] Specifically, the measuring element 220 can be an NTC thermistor, and the temperature collection assembly composed of the measuring element 220 and the shell 210 can be understood as a patch type NTC.

[0034] In order to accurately collect the temperature of the battery cell 10, the surface of the shell 210 that is fixedly attached to the battery cell 10 is provided with a groove 211, and the measuring element 220 can be arranged in the groove 211. After the shell 210 is fixedly attached to the battery cell 10, the measuring element 220 can abut against the battery cell 10 in the groove 211, which can not only avoid the exposure of the measuring element 220 to the outside, but also accurately collect the temperature of the battery cell 10.

[0035] It should be noted that, in order to improve the accuracy of the temperature acquisition of the battery cell 10, the application can also be provided with a plurality of grooves 211 on the surface of the shell 210 and the battery cell 10, and each groove 211 is provided with a measuring element 220, or the surface of the shell 210 and the battery cell 10 is provided with a groove 211, and a plurality of measuring elements 220 can be arranged in the groove 211.

[0036] It can be understood that the number of grooves 211 arranged on the surface of the shell 210 and the battery cell 10 and the number of measuring elements 220 in the temperature acquisition assembly can be selected according to actual application, and the application is not limited.

[0037] The temperature acquisition assembly provided by the application comprises a shell 210 and at least one measuring element 220, one surface of the shell 210 is attached to the battery cell 10, the surface is provided with a groove 211, the measuring element 220 is arranged in the groove 211 and abuts against the battery cell 10, so that the measuring element 220 for collecting the temperature of the battery cell 10 can be firmly fixed on the battery cell 10, and the measuring element 220 can also abut against the battery cell 10, so that the temperature of the battery cell 10 can be accurately collected, and the accuracy of the temperature acquisition of the battery cell 10 is greatly improved.

[0038] At the same time, compared with the NTC of the water droplet head, the collection deviation of the NTC of the water droplet head can only reach 1%, while the collection deviation of the temperature acquisition assembly provided by the application can reach 0.5%, which greatly improves the accuracy of temperature acquisition.

[0039] In some embodiments, as shown in FIGS. 2, 3 and 7, the temperature acquisition assembly further comprises a connecting piece 230; wherein one side of the connecting piece 230 is attached to the battery cell 10, and the other side of the connecting piece 230 is attached to one surface of the shell 210.

[0040] In this embodiment, the connecting piece 230 is used to realize the attachment and fixation of the shell 210 and the battery cell 10, the connecting piece 230 can be double-sided adhesive, one side of the double-sided adhesive can be bonded to the side of the battery cell 10, and the other side of the double-sided adhesive can be bonded to one surface of the shell 210, so that the shell 210 and the battery cell 10 can be attached and fixed.

[0041] In order to select the double-sided adhesive, the double-sided adhesive needs to have high high-temperature resistance and low-temperature resistance, so as to ensure that the shell 210 can be stably attached to the side of the battery cell 10, thereby solving the problems of difficult installation of the temperature acquisition assembly and low production efficiency, and greatly improving the production efficiency.

[0042] In some embodiments, as shown in FIGS. 2, 3 and 7, the connecting piece 230 is provided with a first opening 231, and the first opening 231 is matched with the groove 211.

[0043] In the embodiment, in order to avoid the interference of the connecting piece 230 on the temperature collection of the measuring piece 220, an opening, i.e., the first opening 231, is further arranged on the connecting piece 230 to avoid the measuring piece 220, so that the temperature of the side surface of the battery cell 10 can be accurately conducted to the measuring piece 220, thereby improving the accuracy of the temperature collection of the battery cell 10.

[0044] In some embodiments, as shown in FIGS. 2, 3 and 12, the temperature collection assembly further comprises a heat-conducting piece 240; wherein the heat-conducting piece 240 is arranged in the groove 211, one side surface of the heat-conducting piece 240 abuts against the battery cell 10, and the other side surface of the heat-conducting piece 240 abuts against the measuring piece 220.

[0045] In the embodiment, in order to accurately collect the temperature of the battery cell 10, the heat-conducting piece 240 can be arranged between the measuring piece 220 and the battery cell 10 to be configured to transfer the temperature between the battery cell 10 and the measuring piece 220. The heat-conducting piece 240 can be heat-conducting glue, which has a high thermal conductivity and is elastic, can quickly conduct the temperature of the battery cell 10 to the measuring piece 220, and has a shape that is similar to that of the battery cell 10 and protrudes from the shell 210 by a predetermined thickness, such as 0.2 mm, thereby ensuring that there is no gap between the measuring piece 220 and the battery cell 10 and improving the accuracy of temperature collection.

[0046] It should be noted that the heat-conducting piece 240 can also cover the groove 211, i.e., a part of the heat-conducting piece 240 is arranged in the groove 211, and the other part is arranged between the shell 210 and the battery cell 10. The structure of the heat-conducting piece 240 can be selected according to actual application, which is not limited in the present application.

[0047] In some embodiments, as shown in FIGS. 2, 3, 4, 5, 8 and 9, the temperature collection assembly further comprises an electrical connecting piece 250; wherein the shell 210 is provided with a second opening 212, the second opening 212 is in communication with the groove 211; one end of the electrical connecting piece 250 is electrically connected to the measuring piece 220 through the second opening 212, and the other end of the electrical connecting piece 250 is electrically connected to a target device.

[0048] Specifically, in order to facilitate the electrical connection between the measuring piece 220 and the master control board or / and the slave control board of the battery management system, an opening, i.e., the second opening 212, is further arranged on the shell 210, and the second opening 212 needs to be in communication with the groove 211, so that the electrical connecting piece 250 for electrically connecting the measuring piece 220 and the target device can enter the groove 211 through the second opening 212 and be electrically connected to the measuring piece 220. The target device can be understood as the master control board or the slave control board of the battery management system.

[0049] Meanwhile, the second opening 212 can be arranged on the shell 210 in a vertical direction or in a horizontal direction. It should be noted that the position of the second opening 212 can be arranged according to the arrangement of the battery cell 10 in the battery module, which is not limited in the present application.

[0050] In some embodiments, as shown in FIGS. 2, 3, 4, 5, 6, 8 and 9, the electrical connecting member 250 includes a flexible circuit board 251 and a connector 252; wherein the flexible circuit board 251 includes a first connecting portion 2511 and a second connecting portion 2512, the first connecting portion 2511 is electrically connected to the measuring member 220 through the second opening 212, the second connecting portion 2512 is electrically connected to the connector 252, and the connector 252 is electrically connected to the target device.

[0051] In the present embodiment, the electrical connecting member 250 can be composed of the flexible circuit board 251 and the connector 252, the flexible circuit board 251 includes the first connecting portion 2511 and the second connecting portion 2512, the first connecting portion 2511 penetrates through the second opening 212 to electrically connect the measuring member 220, the second connecting portion 2512 is electrically connected to the target device through the connector 252, the first connecting portion 2511 and the second connecting portion 2512 can be integrally formed to form the flexible circuit board 251, and meanwhile, the first connecting portion 2511 and the second connecting portion 2512 can be bent.

[0052] The connector 252 is configured to transmit signals, facilitating the transmission of signals collected by the measuring member 220, and the connector 252 can be directly plugged with a master control board or a slave control board of a battery management system.

[0053] It should be noted that the bending mode between the first connecting portion 2511 and the second connecting portion 2512 can be bent according to the arrangement of the battery cell 10 in the battery module, which is not limited in the present application.

[0054] In some embodiments, as shown in FIGS. 3, 4, 5 and 11, the temperature collecting assembly further includes a first reinforcing member 260; wherein the first reinforcing member 260 is configured to fix the second connecting portion 2512 on the connector 252.

[0055] In the present embodiment, the first reinforcing member 260 can be a reinforcing plate, which can be fixedly connected to the flexible circuit board 251 and the connector 252 after the electrical connection of the flexible circuit board 251 and the connector 252.

[0056] Specifically, two connecting points 2521 are arranged on the connector 252, and after the flexible circuit board 251 is electrically connected with the connector 252, the first reinforcing member 260 can be fixedly connected with the connecting points 2521 to fix the second connecting portion 2512 between the first reinforcing member 260 and the connector 252.

[0057] In some embodiments, as shown in FIG. 3, the temperature acquisition assembly further comprises a second reinforcing member 270; wherein one surface of the second reinforcing member 270 abuts against the first connecting portion 2511, and the other surface of the second reinforcing member 270 abuts against the bottom of the groove 211.

[0058] Specifically, the measuring member 220 can be electrically connected to the flexible circuit board 251 in a welding manner. After the measuring member 220 is welded to the flexible circuit board 251, in order to avoid the welding point on the first connecting portion 2511 from being damaged due to the extrusion of the bottom of the groove 211, a second reinforcing member 270 needs to be arranged between the welding point and the bottom of the groove 211, that is, the second reinforcing member 270 is arranged between the first connecting portion 2511 and the bottom of the groove 211. The second reinforcing member 270 can be a reinforcing plate.

[0059] In some embodiments, as shown in FIGS. 3, 4, 5 and 6, the measuring member 220 comprises a first thermistor 221 and a second thermistor 222; wherein the first thermistor 221 and the second thermistor 222 are both configured to measure the temperature of the battery cell 10.

[0060] In this embodiment, the measuring member 220 can comprise two thermistors, i.e., the first thermistor 221 and the second thermistor 222, and the first thermistor 221 and the second thermistor 222 can be welded to the flexible circuit board 251 and arranged in parallel, thereby not only being able to increase the mutual checking of the collected temperature, but also being able to collect the temperature of the battery cell 10 by the other thermistor when one of the thermistors fails, so as to realize real-time and accurate temperature acquisition in the whole life cycle of the battery cell 10.

[0061] In some embodiments, as shown in FIG. 3, the temperature acquisition assembly further comprises a sealing member 280, which is arranged between the measuring member 220 and the battery cell 10 and is configured to seal the measuring member 220.

[0062] In this embodiment, the measuring member 220 can be embedded in the sealing member 280, thereby preventing the measuring member 220 from being damaged due to impact and preventing the erosion of the measuring member 220 by water vapor. Specifically, after the measuring member 220 is welded to the first connecting portion 2511 of the flexible circuit board 251, the sealing member 280 can directly seal the measuring member 220.

[0063] The sealing member 280 can be UV glue, also known as ultraviolet curing glue, shadowless glue or photosensitive glue. The UV glue is a single-component modified acrylate adhesive. The UV glue can be cured by ultraviolet irradiation.

[0064] In some embodiments, as shown in FIG. 3 and FIG. 10, the temperature acquisition assembly further comprises a third reinforcing member 290; wherein the third reinforcing member 290 is provided with a third opening 291, and the measuring member 220 is arranged in the third opening 291.

[0065] In this embodiment, the third reinforcing member 290 is arranged between the heat-conducting member 240 and the first connecting portion 2511. The third reinforcing member 290 can be a reinforcing plate, and the third reinforcing plate is provided with the third opening 291. The third opening 291 can be a circular through hole. The sealing member 280 can be filled in the third opening 291, thereby ensuring the height of the sealing member 280 and preventing the measuring member 220 from being damaged during installation and use.

[0066] It should be noted that the shape of the third opening 291 can also be rectangular or triangular. The specific shape can be selected according to actual application, and the present application does not make specific limitation.

[0067] In some embodiments, the present application further provides a battery comprising the battery cell 10 and the temperature acquisition assembly provided by the present application. The temperature acquisition assembly is attached to the side surface of the battery cell 10.

[0068] In this embodiment, the battery comprises a battery module and a temperature acquisition assembly. The battery module comprises a plurality of battery cells 10 arranged side by side. The temperature acquisition assembly is configured to acquire the temperature of the battery cell 10 and transmit the acquired temperature to the battery management system, so as to accurately monitor the real-time temperature of the battery cell 10.

[0069] The battery can be a large cylindrical battery, and the battery cell 10 of the large cylindrical battery can be a cylindrical battery cell.

Claims

1. A temperature acquisition assembly, comprising: a housing (210), a surface of the housing (210) being attached to an electric core (10), the surface being provided with a groove (211); and at least one measuring element (220) being arranged in the groove (211) and abutting against the electric core (10).

2. The temperature harvesting assembly of claim 1, further comprising: a connecting element (230); wherein one side of the connecting element (230) is attached to the electric core (10) and the other side of the connecting element (230) is attached to a surface of the housing (210).

3. The temperature harvesting assembly of claim 2, wherein, The connecting element (230) is provided with a first opening (231) which matches the groove (211).

4. The temperature harvesting assembly of any one of claims 1-3, further comprising: a heat conducting element (240); wherein the heat conducting element (240) is arranged in the groove (211), one side of the heat conducting element (240) abutting against the electric core (10) and the other side of the heat conducting element (240) abutting against the measuring element (220).

5. The temperature harvesting assembly of any one of claims 1-4, further comprising: an electric connecting element (250); wherein the housing (210) is provided with a second opening (212) which communicates with the groove (211); one end of the electric connecting element (250) is electrically connected to the measuring element (220) through the second opening (212) and the other end of the electric connecting element (250) is electrically connected to a target device.

6. The temperature harvesting assembly of claim 5, wherein, The electric connecting element (250) comprises a flexible circuit board (251) and a connector (252); wherein the flexible circuit board (251) comprises a first connecting part (2511) and a second connecting part (2512), the first connecting part (2511) is electrically connected to the measuring element (220) through the second opening (212), the second connecting part (2512) is electrically connected to the connector (252), and the connector (252) is electrically connected to the target device.

7. The temperature harvesting assembly of claim 6, further comprising: a first reinforcing element (260); wherein the first reinforcing element (260) is configured to fix the second connecting part (2512) to the connector (252).

8. The temperature harvesting assembly of claim 6, further comprising: a second reinforcing element (270); wherein one surface of the second reinforcing element (270) abuts against the first connecting part (2511) and the other surface of the second reinforcing element (270) abuts against the bottom of the groove (211).

9. The temperature harvesting assembly of any one of claims 1-8, wherein, The measuring element (220) comprises a first thermistor (221) and a second thermistor (222); wherein the first thermistor (221) and the second thermistor (222) are both configured to measure the temperature of the electric core (10).

10. The temperature harvesting assembly of any one of claims 1-8, further comprising: a sealing element (280) being arranged between the measuring element (220) and the electric core (10) and configured to seal the measuring element (220).

11. The temperature harvesting assembly of any one of claims 1-8, further comprising: a third reinforcing element (290); wherein the third reinforcing element (290) is provided with a third opening (291) and the measuring element (220) is arranged in the third opening (291).

12. A battery comprising: an electric core (10) and the temperature acquisition assembly of any one of claims 1-11, the temperature acquisition assembly being attached to a side of the electric core (10).

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