A temperature collection device and a battery module

Abstract

The utility model discloses a temperature acquisition device and a battery module. The temperature acquisition device is used to acquire the temperature of a battery cell in a battery cell module, and includes: a first flexible circuit board, the first flexible circuit board includes a first body, and a first circuit is arranged on the first body; a second flexible circuit board, the second flexible circuit board includes a second body, and a second circuit is arranged on the second body; a temperature sensor is arranged on the second flexible circuit board and electrically connected to the second circuit; a crimping piece, the crimping piece crimps the first flexible circuit board and the second flexible circuit board, so that the first circuit and the second circuit are connected and electrically conductive. The utility model can be set according to the position requirements of temperature measurement, and the accuracy of temperature acquisition is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a temperature acquisition device and a battery module. Background Art

[0002] Flexible circuit board, or FPC, is a highly reliable and extremely flexible printed circuit board made of polyimide or polyester film as the substrate. It has advantages that other types of circuit boards cannot match, such as high wiring density, light weight, thin thickness, foldable and bendable, three-dimensional wiring, and safety performance.

[0003] As cars develop towards electrification and intelligence, power batteries, as one of the core key components of electric vehicles, are a very important part of the entire electric vehicle. Improving their own capacity and ensuring safety performance are the main focus of various manufacturers. Power batteries mainly include battery modules, mechanical structure systems, electrical control systems, BMS (battery management system) and thermal management systems. Power batteries generate a lot of heat during operation. The heat causes the internal temperature of the battery to be too high, which will affect the cycle life of the battery and even endanger the safety of the battery.

[0004] In order to prevent the power battery of new energy vehicles from overheating, it is usually necessary to measure and monitor the temperature of the battery cells in the battery module. Figure 1 As shown, currently, temperature collection is usually performed by directly welding and installing multiple temperature collection elements 101 on a flexible circuit board. However, this arrangement is subject to many restrictions on the location of the temperature collection element 101. For example, due to the limitations of the circuit design of the flexible circuit board, the ambient temperature in the battery pack is usually measured, rather than the actual temperature of the battery cell of the battery module. Therefore, it is difficult to measure the actual temperature of the battery cell. Utility Model Content

[0005] In view of this, the utility model aims to propose a temperature acquisition device and a battery module, which are not limited by the circuit design of the flexible circuit board, but can be set according to the location requirements of temperature measurement, collect the actual temperature of the battery cell, and improve the accuracy of temperature acquisition.

[0006] In order to solve the above technical problems, the embodiment of the utility model provides a temperature acquisition device for collecting the temperature of the battery cell in the battery cell module, comprising:

[0007] A first flexible circuit board, the first flexible circuit board comprises a first body, and a first circuit is arranged on the first body;

[0008] A second flexible circuit board, the second flexible circuit board comprises a second body, and a second circuit is arranged on the second body;

[0009] A temperature sensor is disposed on the second flexible circuit board and is electrically connected to the second circuit;

[0010] The crimping piece crimps the first flexible circuit board and the second flexible circuit board to connect the first circuit and the second circuit and make them electrically conductive.

[0011] Optionally, the crimping piece includes a crimping body and a plurality of jaws, and the plurality of jaws are spaced apart on both sides of the crimping body along the length direction of the crimping body, and are used to penetrate the first flexible circuit board and the second flexible circuit board from one side of the first flexible circuit board or the second flexible circuit board and form a reverse hook on the other side when the second flexible circuit board is connected to the first flexible circuit board, thereby crimping the first flexible circuit board and the second flexible circuit board.

[0012] Optionally, the first body is also provided with a plurality of first solder pads electrically connected to the first circuit, and the second body is also provided with a second solder pad electrically connected to the second circuit. When the first flexible circuit board and the second flexible circuit board are crimped by the crimping piece, the positions of the first solder pad and the second solder pad correspond, and the clamping claws of the crimping piece penetrate the first solder pad and the second solder pad from one side of the first flexible circuit board or the second flexible circuit board and form a reverse hook on the other side.

[0013] Optionally, two puncture portions arranged side by side are respectively provided on the first soldering pad and the second soldering pad, and the puncture portions extend along the length direction of the crimping body and correspond to the positions of the clamping jaws when the clamping jaws penetrate the first soldering pad and the second soldering pad.

[0014] Optionally, the plurality of clamping jaws are asymmetrically arranged on both sides of the crimping body.

[0015] Optionally, three clamping jaws are provided on one side of the crimping body, and two clamping jaws are provided on the other side, and the three clamping jaws and the two clamping jaws are staggered with each other.

[0016] Optionally, a plurality of bumps are provided on the crimping body, and the plurality of bumps are spaced apart along the length direction of the crimping body, and the bumps are used to contact the first pad or the second pad opposite thereto when the crimping piece presses the first flexible circuit board and the second flexible circuit board.

[0017] Optionally, an elastic component is provided on the second flexible circuit board, a penetrating accommodating hole is provided in the middle of the elastic component, and the temperature sensor is arranged in the accommodating hole.

[0018] Optionally, the elastic member is a resilient foam.

[0019] An embodiment of the utility model further provides a battery module, comprising: the temperature collection device as described above and a battery cell module, the battery cell module comprising a plurality of battery cells stacked in sequence along a first direction, and the temperature collection device is arranged on the battery cell module to collect the temperature of the battery cells.

[0020] The beneficial effects of the utility model are:

[0021] The temperature sensor is set on the second flexible circuit board. The second flexible circuit board used for temperature collection is an independent flexible circuit board. When in use, the second flexible circuit board can be set at the required position according to the temperature measurement needs, and the first flexible circuit board and the second flexible circuit board are connected by crimping parts, and the first circuit and the second circuit are made conductive, so that the temperature of the battery cell collected by the temperature sensor is transmitted through the first circuit and the second circuit. Therefore, this setting method is not only not limited by the circuit design of the first flexible circuit board, but also can set the second flexible circuit board for temperature measurement at the position where temperature measurement is required, reducing the production process requirements, thereby reducing the production cost; moreover, since the temperature sensor can directly measure the temperature of the battery cell, it can reduce the influence of the internal environment of the battery on the temperature collection, thereby improving the accuracy of temperature collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings, the various parts are not necessarily drawn according to the actual scale.

[0023] Figure 1 A schematic diagram showing the structure of a temperature collection device in the prior art is shown;

[0024] Figure 2 A schematic diagram showing the structure of a temperature collection device provided by an embodiment of the utility model is shown;

[0025] Figure 3 A partially enlarged schematic diagram of a temperature collection device provided by an embodiment of the utility model is shown;

[0026] Figure 4 A schematic diagram of the three-dimensional structure of a crimping piece provided in one embodiment of the utility model is shown;

[0027] Figure 5 A schematic structural diagram showing the back side of the first pad and the second pad after the crimping of the crimping member provided by one embodiment of the utility model;

[0028] Figure 6 A schematic structural diagram of a first soldering pad provided in one embodiment of the utility model is shown;

[0029] Figure 7 A schematic structural diagram of a second soldering pad provided in one embodiment of the utility model is shown.

[0030] Description of the component numbers in the accompanying drawings:

[0031] 1. First flexible circuit board, 11. First body, 12. First circuit, 13. First pad, 2. Second flexible circuit board, 21. Second body, 22. Second circuit, 23. Second pad, 3. Temperature sensor, 4. Crimping piece, 41. Crimping body, 42. Clamp, 43. Bump, 5. Puncture part, 6. Reciprocating foam, 101. Temperature collection element. DETAILED DESCRIPTION

[0032] The following is an explanation of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0033] The exemplary embodiments of the present invention are now introduced with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention.

[0034] Unless otherwise specified, the terms used herein, including technical terms, have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0037] like Figure 2 and Figure 3 As shown, Figure 2 and Figure 3 The schematic diagrams are respectively the overall structure and the partially enlarged schematic diagram of the temperature acquisition device provided in one embodiment of the utility model. In this embodiment, the temperature acquisition device is used to collect the temperature of the battery cell in the battery cell module, and the temperature acquisition device includes:

[0038] A first flexible circuit board 1, the first flexible circuit board 1 comprises a first body 11, and a first circuit 12 is provided on the first body 11;

[0039] A second flexible circuit board 2, the second flexible circuit board 2 comprises a second body 21, and a second circuit 22 is disposed on the second body 21;

[0040] The temperature sensor 3 is disposed on the second flexible circuit board 2 and is electrically connected to the second circuit 22;

[0041] The crimping member 4 crimps the first flexible circuit board 1 and the second flexible circuit board 2 to connect the first circuit 12 and the second circuit 22 and make them electrically conductive.

[0042] According to the temperature acquisition device of the embodiment of the utility model, the temperature sensor 3 is arranged on the second flexible circuit board 2, and the second flexible circuit board 2 is crimped and connected with the first flexible circuit board 1 through the crimping piece 4, so that the first circuit 12 and the second circuit 22 are connected and electrically conductive. After collecting the temperature of the battery cell in the battery cell module, the temperature sensor 3 can transmit the temperature signal to the battery management system through the second circuit 22 of the second flexible circuit board 2 and the first circuit 12 of the first flexible circuit board 1. In the temperature acquisition device provided by the utility model, the second flexible circuit board 2 is used to collect the temperature of the battery cell, and the first flexible circuit board 1 is used to transmit the collected temperature signal. Therefore, the second flexible circuit board 2 for temperature acquisition is an independent flexible circuit board. When used, the second flexible circuit board 2 can be set at a required position according to the temperature measurement needs. Therefore, this setting method is not only not limited by the circuit design of the first flexible circuit board 1, but also can be set at the position where the temperature measurement is required, which reduces the production process requirements, thereby reducing the production cost; and, since the temperature sensor 3 can directly measure the temperature of the battery cell, it can reduce the influence of the internal environment of the battery on the temperature acquisition, thereby improving the accuracy of temperature acquisition.

[0043] Specifically, the first flexible circuit board 1 is arranged above the battery cell module and extends along the length direction of the battery cell module. One end of the second flexible circuit board 2 is crimped to one side of the first flexible circuit board 1 through a crimping piece 4. The crimping piece 4 not only plays a role in fixing the connection between the first flexible circuit board 1 and the second flexible circuit board 2, but also plays a role in electrically conducting the second circuit 22 and the first circuit 12. The temperature sensor 3 is arranged at the other end of the second flexible circuit board 2 and is electrically connected to the second circuit 22, and is used to collect the temperature of the battery cell in the battery cell module, so as to transmit the collected temperature signal to the battery management system through the second circuit 22 and the first circuit 12.

[0044] It is worth mentioning that Figure 2 The number of the second flexible circuit boards 2 is only shown as an example, but the number can be set according to actual needs, and the present invention does not impose any limitation on this.

[0045] In this embodiment, the second circuit 22 is arranged on the front side of the second flexible circuit board 2, and the temperature sensor 3 is welded on the second flexible circuit board 2 and electrically connected to the second circuit 22, that is, the temperature sensor 3 is connected to the second circuit 22 by welding. The back side of the second flexible circuit board 2 is bonded with a reinforcement plate, and a thermal pad is pasted on the bottom of the reinforcement plate, and the thermal pad is used to connect with the battery cell. Optionally, the thermal pad is an elastic member. The temperature of the battery cell is transferred to the temperature sensor through the thermal pad and the reinforcement plate, and then the temperature of the battery is collected. Optionally, the thermal pad is pasted on the battery cell to fix the position of the thermal pad, thereby improving the accuracy of the temperature collected by the temperature sensor.

[0046] In this embodiment, the temperature sensor 3 is an NTC temperature sensor, but it is not limited thereto. In other embodiments, the temperature sensor 3 may also be implemented by other types of temperature sensors, such as a thermocouple.

[0047] NTC temperature sensors are implemented using NTC thermistors, which are usually made of oxides, ceramics or polymers. The characteristic of this material is that its resistance value decreases as the temperature increases. This negative temperature coefficient makes NTC temperature sensors suitable for measuring temperature. When the NTC temperature sensor is exposed to the ambient temperature, it absorbs the surrounding heat and converts it into a change in resistance value. The resistance value of the NTC temperature sensor is negatively correlated with the ambient temperature, that is, the resistance value decreases as the temperature increases. This is because when the temperature increases, the electronic activity within the material increases, resulting in a decrease in resistance value. By measuring the resistance value of the NTC temperature sensor, the temperature of the environment can be determined. This is usually done by connecting the NTC temperature sensor to a measuring circuit, which measures the resistance value through current or voltage and converts it into a temperature value.

[0048] The material of the crimping piece 4 is a conductive material to electrically connect the first circuit 12 and the second circuit 22. In this embodiment, the material of the crimping piece 4 is CUSN8 (tin bronze containing iron and manganese elements), which has the characteristics of high strength and high temperature resistance. It is worth noting that in other embodiments, the material of the crimping piece 4 can also be a copper-nickel alloy, and the utility model does not limit this, as long as it can conduct electricity.

[0049] Furthermore, if Figures 3 to 5 As shown, in this embodiment, the crimping member 4 includes a crimping body 41 and a plurality of clamping jaws 42, and the plurality of clamping jaws 42 are respectively arranged at intervals on both sides of the crimping body 41 along the length direction of the crimping body 41, and are used to penetrate the first flexible circuit board 1 and the second flexible circuit board 2 from one side of the first flexible circuit board 1 or the second flexible circuit board 2 and form a reverse hook on the other side when the second flexible circuit board 2 is connected to the first flexible circuit board 1, so as to press the first flexible circuit board 1 and the second flexible circuit board 2 together.

[0050] Thus, the clamping claw 42 penetrates the first flexible circuit board 1 and the second flexible circuit board 2, and bends and forms a reverse hook on the other side of the first flexible circuit board 1 and the second flexible circuit board 2, so that the two flexible circuit boards are tightly pressed together, thereby ensuring signal conduction of the two flexible circuit boards.

[0051] Specifically, the clamping jaws 42 include a plurality of clamping jaws 42, which are arranged on both sides of the crimping body 41 along the length direction of the crimping body 41, and a gap is provided between two adjacent clamping jaws 42 to increase the contact area and enhance the firmness of the crimping. The clamping jaws 42 extend outward from the crimping body 41, and the width of the clamping jaws 42 gradually decreases in the direction in which the clamping jaws 42 extend outward and form a tip at the far end. Figure 5 As shown, the clamping jaw 42 includes a connecting portion and a triangular sharp portion, wherein one side of the connecting portion is connected to the crimping body 41, and the other side is connected to the sharp portion, and the sharp portion extends in a direction substantially perpendicular to the crimping body 41 to facilitate penetration of the first flexible circuit board 1 and the second flexible circuit board 2.

[0052] Furthermore, if Figure 2 , Figures 5 to 7 As shown, in this embodiment, the first body 11 is further provided with a plurality of first pads 13 electrically connected to the first circuit 12, and the second body 21 is further provided with a second pad 23 electrically connected to the second circuit 22. When the first flexible circuit board 1 and the second flexible circuit board 2 are crimped by the crimping piece 4, the positions of the first pads 13 and the second pads 23 correspond, and the clamping claws 42 of the crimping piece 4 penetrate the first pads 13 and the second pads 23 from one side of the first flexible circuit board 1 or the second flexible circuit board 2 and form a reverse hook on the other side.

[0053] Specifically, a first pad 13 is disposed on the first flexible circuit board 1 and is provided in plurality, so as to be connected to a plurality of second flexible circuit boards 2 for temperature collection, so that a plurality of collected temperature signals can be transmitted. A second pad 23 is disposed on the second flexible circuit board 2. Optionally, the first pad 13 and the second pad 23 are set to the same size for ease of processing and manufacturing. It should be noted that the specific size of the first pad 13 and the second pad 23 can be determined according to the size of the crimping piece 4.

[0054] The clamping claw 42 of the crimping member 4 is used to penetrate the first pad 13 and the second pad 23 to electrically connect the first circuit 12 and the second circuit 22. When one end of the second flexible circuit board 2 is connected to one side of the first flexible circuit board 1 through the crimping member 4, the second flexible circuit board 2 can be overlapped on the front side of the first flexible circuit board 1 or on the back side of the first flexible circuit board 1. The utility model does not limit this, as long as the positions of the first pad 13 and the second pad 23 correspond. Figure 3 and Figure 5 As shown, the crimping member 4 sequentially penetrates the second pad 23 and the first pad 13 from one side of the second flexible circuit board 2, and forms a reverse hook on the other side of the first flexible circuit board 1 away from the second flexible circuit board 2. It is worth noting that in the present invention, the clamping jaws 42 of the crimping member 4 form a reverse hook on the other side, which can not only fix the first flexible circuit board 1 and the second flexible circuit board 2, but also make the first circuit 12 and the second circuit 22 electrically conductive.

[0055] Further, in this embodiment, two crimping members 4 are provided at the position where the first flexible circuit board 1 is connected to each second flexible circuit board 2. Correspondingly, two first soldering pads 13 are provided at the position of the first flexible circuit board 1 for connecting with the second flexible circuit board 2, and two second soldering pads 23 are provided on the second flexible circuit board 2.

[0056] Specifically, two crimping parts 4 are provided at the connection position to respectively connect the positive line for temperature collection of the first flexible circuit board 1 and the positive line for temperature collection of the second flexible circuit board 2, and to connect the negative line for temperature collection of the first flexible circuit board 1 and the negative line for temperature collection of the second flexible circuit board 2, so that a loop can be formed with the battery management system through the connector provided on the first flexible circuit board 1, and the resistance value of the loop can also be monitored. Therefore, when the resistance of the temperature sensor 3 decreases due to the increase in temperature, the battery management system can immediately detect it. In this embodiment, the positive line for temperature collection is an NTC positive line, and the negative line for temperature collection is an NTC negative line.

[0057] Optional, such as Figures 5 to 7As shown, in this embodiment, two puncture portions 5 arranged side by side are respectively provided on the first solder pad 13 and the second solder pad 23, and the puncture portions 5 are extended along the length direction of the crimping body 41 and correspond to the position of the clamping jaws 42 when the clamping jaws 42 penetrate the first solder pad 13 and the second solder pad 23.

[0058] Specifically, the material of the first pad 13 and the second pad 23 is copper so as to be conductive. In this embodiment, the puncture portion 5 is formed by etching away the copper on the pad. Thus, when installing the crimping member 4, the clamping jaw 42 is aligned with the puncture portion 5 and penetrates, thereby facilitating the installation of the crimping member 4 and increasing the accuracy of the installation position, while also reducing the generation of metal burrs and metal foreign matter.

[0059] Furthermore, the plurality of clamping claws 42 are asymmetrically disposed on both sides of the crimping body 41. Thus, by connecting the first pad 13 and the second pad 23 at different positions, the connection stability can be ensured.

[0060] Furthermore, three clamping jaws 42 are provided on one side of the crimping body 41, and two clamping jaws 42 are provided on the other side, and the three clamping jaws 42 are staggered from the two clamping jaws 42. Thus, when the two flexible circuit boards are pressed together, the conductivity of the circuits of the two flexible circuit boards can be ensured, the compactness of the crimping member 4 can be ensured, and the production cost can be reduced.

[0061] Furthermore, a plurality of protrusions 43 are provided on the crimping body 41, and the plurality of protrusions 43 are arranged at intervals along the length direction of the crimping body 41, and the protrusions 43 are used to contact the first pad 13 or the second pad 23 opposite thereto when the crimping member 4 presses the first flexible circuit board 1 and the second flexible circuit board 2. Thus, it can be ensured that when the crimping member 4 presses the two flexible circuit boards, the crimping member 4 can be in close contact with the pads on the flexible circuit board, thereby realizing the function of stable current conduction.

[0062] Furthermore, an elastic component is provided on the second flexible circuit board 2 , and a penetrating receiving hole is provided in the middle of the elastic component, and the temperature sensor 3 is arranged in the receiving hole.

[0063] Specifically, the elastic component is sleeved on the outside of the temperature sensor 3 to protect the temperature sensor 3 and prevent the temperature sensor 3 from being covered and causing poor heat dissipation, thereby increasing the temperature of the temperature sensor and affecting the detection accuracy.

[0064] Optionally, the bottom of the elastic component is attached to the front side of the second flexible circuit board 2, and the temperature sensor 3 is arranged in the receiving hole of the elastic component.

[0065] Furthermore, if Figure 3As shown, in this embodiment, the elastic member is a circular foam 6. Therefore, it is easy to process and is compatible with the shape of the temperature sensor 3, which can better protect the temperature sensor 3 and improve the accuracy of temperature collection.

[0066] It is worth noting that, in other embodiments, foams of other shapes may also be used according to the shape of the battery cell and the fitting position.

[0067] The temperature acquisition device provided by the utility model is configured such that a temperature sensor 3 for acquiring the temperature of a battery cell is arranged on a second flexible circuit board 2, and the second flexible circuit board 2 is crimped and connected to the first flexible circuit board 1 through a crimping piece 4, so that the second circuit 22 and the first circuit 12 thereon are electrically conductive, thereby transmitting the temperature signal of the battery cell temperature acquired by the temperature sensor 3 to a battery management system through the second circuit 22 of the second flexible circuit board 2 and the first circuit 12 of the first flexible circuit board 1, and the battery management system can monitor the temperature of the battery cell and improve the accuracy of temperature acquisition.

[0068] According to the temperature acquisition device provided by the utility model, the second flexible circuit board for temperature acquisition is an independent flexible circuit board. When in use, the second flexible circuit board can be set at a required position according to the temperature measurement needs. Therefore, this setting method is not limited by the circuit design of the first flexible circuit board, and the second flexible circuit board for temperature measurement can be set at the position where the temperature measurement is required, which reduces the production process requirements and thus reduces the production cost. In addition, since the temperature sensor can be set at the position of the battery cell to be measured, the temperature of the battery cell can be directly measured, so the influence of the internal environment of the battery on the temperature acquisition can be reduced, thereby improving the accuracy of temperature acquisition.

[0069] The embodiment of the utility model further provides a battery module, comprising: the temperature acquisition device and the battery module as described above, the battery module comprising a temperature acquisition device along a first direction (such as Figure 2 A plurality of battery cells are stacked in sequence (as shown in the x direction), and a temperature collection device is arranged on the battery cell module to collect the temperature of the battery cells.

[0070] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A temperature acquisition device for acquiring the temperature of a battery cell in a battery cell module, characterized in that: include: A first flexible circuit board, wherein the first flexible circuit board comprises a first body, and a first circuit is disposed on the first body; A second flexible circuit board, the second flexible circuit board comprising a second body, and a second circuit is provided on the second body; a temperature sensor, disposed on the second flexible printed circuit board and electrically connected to the second circuit; A crimping piece is used to crimp the first flexible circuit board and the second flexible circuit board so that the first circuit and the second circuit are connected and electrically conductive.

2. The temperature acquisition device according to claim 1, characterized in that: The crimping piece includes a crimping body and a plurality of clamping jaws, which are spaced apart on both sides of the crimping body along the length direction of the crimping body, and are used to penetrate the first flexible circuit board and the second flexible circuit board from one side of the first flexible circuit board or the second flexible circuit board and form a reverse hook on the other side when the second flexible circuit board is connected to the first flexible circuit board, thereby pressing the first flexible circuit board and the second flexible circuit board together.

3. The temperature acquisition device according to claim 2, characterized in that: The first body is also provided with a plurality of first solder pads electrically connected to the first circuit, and the second body is also provided with a second solder pad electrically connected to the second circuit. When the first flexible circuit board and the second flexible circuit board are connected by the crimping component, the positions of the first solder pads and the second solder pads correspond to each other, and the clamping claws of the crimping component penetrate the first solder pads and the second solder pads from one side of the first flexible circuit board or the second flexible circuit board and form a reverse hook on the other side.

4. The temperature acquisition device according to claim 3, characterized in that: Two puncture portions arranged side by side are respectively provided on the first pad and the second pad. The puncture portions extend along the length direction of the crimping body and correspond to the position of the clamping jaws when the clamping jaws penetrate the first pad and the second pad.

5. The temperature acquisition device according to any one of claims 2 to 4, characterized in that: The plurality of clamping jaws are asymmetrically arranged on both sides of the crimping body.

6. The temperature acquisition device according to claim 5, characterized in that: One side of the crimping body is provided with three clamping jaws, and the other side is provided with two clamping jaws, and the three clamping jaws and the two clamping jaws are staggered with each other.

7. The temperature acquisition device according to claim 4, characterized in that: The crimping body is provided with a plurality of bumps, which are spaced apart along the length direction of the crimping body, and are used to contact the first pad or the second pad opposite thereto when the crimping member presses the first flexible circuit board and the second flexible circuit board together.

8. The temperature acquisition device according to claim 1, characterized in that: An elastic component is disposed on the second flexible circuit board. A penetrating accommodating hole is formed in the middle of the elastic component. The temperature sensor is disposed in the accommodating hole.

9. The temperature acquisition device according to claim 8, characterized in that: The elastic component is a resilient foam.

10. A battery module, characterized in that: include: The temperature collection device and the battery cell module according to any one of claims 1 to 9, wherein the battery cell module comprises a plurality of battery cells stacked in sequence along a first direction, and the temperature collection device is arranged on the battery cell module to collect the temperature of the battery cells.

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