Signal acquisition component and installation method, battery module and battery pack

Abstract

The present application relates to the field of new energy technology, and in particular to a signal acquisition component and installation method, a battery module and a battery pack. The signal acquisition component includes: a conductive sheet, which is used to electrically connect to the electrode terminal of the battery cell and thermally couple with the battery cell; a PCB board, which is fixed in a stacked manner with the conductive sheet and has: a first surface thermally coupled with the conductive sheet, a second surface opposite to the first surface in the thickness direction of the PCB board, a first pad, a second pad and a third pad arranged on the second surface, and the first pad is electrically connected to the conductive circuit of the conductive sheet; wherein the conductive circuit includes a conductive via, the first pad is used to weld the voltage acquisition line, and the second pad and the third pad are used to weld the temperature acquisition line.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a signal acquisition component and installation method, a battery module and a battery pack. Background Art

[0002] In order to monitor the operating voltage and operating temperature of the battery cells in the battery PACK module, it is necessary to install a voltage acquisition component and a temperature acquisition component on the battery module.

[0003] The related art proposes a temperature and voltage acquisition structure, in which the temperature acquisition component includes a water drop-shaped temperature sensor wrapped by a temperature sampling nickel sheet, and the voltage acquisition component includes a voltage sampling nickel sheet independent of the temperature sampling nickel sheet. The temperature sampling nickel sheet and the voltage sampling nickel sheet are respectively welded to the conductive bar of the battery module, and the temperature acquisition and voltage acquisition are independent of each other. In this way, two sampling nickel sheets are required to monitor only one battery cell, and this method has at least the following disadvantages:

[0004] 1. The cost of collecting the temperatures of all battery cells is high.

[0005] 2. The temperature of the battery needs to be transferred to the temperature sensor through secondary conduction of the sampling nickel sheet. Heat loss is prone to occur during the transfer process, the conduction speed is slow, and the measurement deviation is large.

[0006] 3. The double sampling nickel sheet occupies a large space on the conductive bar, and has certain requirements on the surface area of ​​the battery conductive bar.

[0007] 4. It is not easy to check the connection quality of the signal acquisition circuit, especially the welding quality between the sampling nickel sheet and the conductive bar. Summary of the invention

[0008] In view of this, in order to solve at least one of the above technical problems, a signal acquisition component and installation method, a battery module and a battery pack are proposed.

[0009] In a first aspect, the present application proposes a signal acquisition component for acquiring the voltage and temperature of a battery cell in a battery module, the signal acquisition component comprising:

[0010] A conductive sheet, which is used to be electrically connected to the electrode terminal of the battery cell and thermally coupled with the battery cell;

[0011] A PCB board is fixed to the conductive sheet in a stacked manner and comprises: a first surface thermally coupled to the conductive sheet, a second surface opposite to the first surface in the thickness direction of the PCB board, a first pad, a second pad and a third pad arranged on the second surface, and the first pad is electrically connected to the conductive circuit of the conductive sheet; wherein the conductive circuit comprises a conductive via, the first pad is used for welding a voltage acquisition line, and the second pad and the third pad are used for welding a temperature acquisition line.

[0012] In some possible implementations, the conductive sheet is used to be welded to a conductive bar electrically connected to an electrode terminal of the battery cell.

[0013] In some possible implementations, the PCB board has a hollow portion extending from the first surface to the second surface, and the conductive sheet is welded to the conductive bar at the hollow portion.

[0014] In some possible implementations, the hollow portion is a circumferentially closed hole, or the hollow portion is a notch extending inward from the outer edge of the PCB board.

[0015] In some possible implementations, the conductive sheet has a latching protrusion protruding in a direction away from the PCB board, and the conductive row has a latching groove for the latching protrusion to latch into.

[0016] In some possible implementations, the clamping protrusion is disposed at the hollow portion, and the clamping protrusion defines a back groove opening toward the hollow portion;

[0017] The signal acquisition component also includes a shell fixed to the PCB board, the shell having a protrusion inserted into the back groove, wherein the protrusion is interference fit with the back groove, so that the clamping protrusion generates expansion deformation to squeeze the clamping groove.

[0018] In some possible implementations, the housing is mounted on the PCB board in a manner of facing the second surface of the PCB board and moving toward the PCB board;

[0019] Preferably, the housing has an opening, and the inner periphery of the opening surrounds and abuts against the periphery of the PCB board;

[0020] Preferably, a portion of the first surface is in close contact with the conductive bar, and the conductive sheet has an elastic force that presses the portion of the first surface toward the conductive bar.

[0021] In a second aspect, the present application proposes a battery module, comprising:

[0022] A battery cell having electrode terminals;

[0023] A conductive bar welded to the electrode terminal;

[0024] It is characterized in that the battery module further comprises the signal acquisition component as described in the first aspect, and the conductive sheet is electrically connected to the electrode terminal by being welded to the conductive bar.

[0025] In a third aspect, the present application proposes a battery pack, comprising:

[0026] The battery module as described in the second aspect;

[0027] A battery box, accommodating the battery module;

[0028] Battery management system BMS;

[0029] A voltage collection line, one end of which is welded to the first welding pad, and the other end of which is connected to the BMS battery management system;

[0030] Two temperature collection lines, one end of each of the two temperature collection lines is welded to the second welding pad and the third welding pad respectively, and the other end of each of the two temperature collection lines is connected to the battery management system BMS.

[0031] In a fourth aspect, the present application proposes a method for installing the signal acquisition assembly as described in the first aspect to a battery module, wherein the battery module comprises a battery cell having an electrode terminal and a conductive bar having a slot, wherein the conductive bar is electrically connected to the electrode terminal and is in thermal contact with the battery cell, and the method comprises:

[0032] Inserting the card protrusion into the card slot;

[0033] The conductive sheet and the conductive bar are welded at the hollow portion.

[0034] According to the signal acquisition component provided by the present application, it includes: a conductive sheet, which is used to be welded to a conductive bar electrically connected to an electrode terminal of a battery cell and is thermally coupled to the battery cell; a PCB board, which is stacked and fixed on the conductive sheet, and has: a first surface thermally coupled to the conductive sheet, a second surface opposite to the first surface in the thickness direction of the PCB board, a hollow portion extending from the first surface to the second surface, a first pad, a second pad and a third pad arranged on the second surface, and the first pad is electrically connected to the conductive circuit of the conductive sheet; wherein the conductive circuit includes a conductive via, the first pad is used to weld a voltage acquisition line, the second pad and the third pad are used to weld a temperature acquisition line, and the conductive sheet is welded to the conductive bar at the hollow portion. In this way, the conductive sheet of the signal acquisition component can be easily welded to the conductive bar, and after assembly, the conductive sheet can collect the voltage signal of the battery cell and transmit the voltage signal to the first pad used to connect the voltage acquisition line, and the temperature sensor can obtain heat from the PCB board stacked with the conductive sheet, thereby obtaining the current temperature of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present application, rather than limiting the present application.

[0036] Figure 1 It is a partial cross-sectional schematic diagram of a battery module provided in one embodiment of the present application.

[0037] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure before the signal acquisition component is installed in the battery module.

[0038] Figure 3 yes Figure 1 Schematic diagram of the three-dimensional structure of the signal acquisition component.

[0039] Figure 4 It is a partial cross-sectional schematic diagram of a battery module provided in another embodiment of the present application.

[0040] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure before the signal acquisition component is installed in the battery module.

[0041] Figure 6 yes Figure 4 Schematic diagram of the three-dimensional structure of the signal acquisition component.

[0042] Figure 7 It is a cross-sectional schematic diagram of a signal acquisition component provided in another embodiment of the present application.

[0043] Description of reference numerals:

[0044] 1-conductive sheet, 11-protrusion, 12-back groove;

[0045] 2-PCB board, 2A-first surface, 2B-second surface, 2C-hollow portion, 2D-sink, 21-first pad, 22-second pad, 23-third pad, 24, 25, 26-conductive traces, 26-conductive vias, 27-fifth pad;

[0046] 3- Temperature sensor;

[0047] 4- Fuse;

[0048] 5-conductive bar, 51-card slot;

[0049] 6-battery cell, 61-electrode terminal;

[0050] 7-housing, 71-protrusion, 72-opening;

[0051] 8-Wireless communication module. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the embodiment of the present application will be clearly and completely described below in conjunction with the drawings of the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application. It can be understood that, in the absence of conflict, some technical means of the various embodiments described herein can be replaced or combined with each other.

[0053] In the description of this application, if there are terms such as "first", "second", etc., they are only used to distinguish the objects described and do not have any order or technical meaning. Therefore, an object defined as "first", "second", etc. may explicitly or implicitly include one or more of the objects. In addition, "one" or "a" and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one, and "multiple" means no less than two.

[0054] In the description of this specification, reference to "one embodiment" or "some embodiments" etc. means that one or more embodiments of the present application include a specific feature, structure or characteristic described in conjunction with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0055] Figure 1 A partial cross-sectional schematic diagram of a battery module provided in one embodiment of the present application, Figure 2 for Figure 1 Schematic diagram of the exploded view of the battery module. The battery module includes a battery cell 6, a conductive bar 5 and a signal acquisition component. The battery cell 6 has an electrode terminal 61, and the conductive bar 5 is electrically connected to the electrode cell by welding to the electrode terminal 61. Based on the welding of the conductive bar 5 and the electrode terminal 61, the conductive bar 5 is also thermally coupled to the battery cell 6, more specifically, the electrode terminal 61.

[0056] In other embodiments, the conductive bar 5 is not only thermally coupled to the electrode terminal 61 of the battery cell 6 in the above manner, but also in close contact with the outer shell of the battery cell 6, so that heat can be transferred more quickly between the battery cell 6 and the conductive bar 5.

[0057] The conductive bar 5 can be an aluminum bar or a copper bar.

[0058] Figure 3 yes Figure 1 The signal acquisition component is used to collect the voltage and temperature of the battery cell 6, and includes a conductive sheet 1, a PCB board 2 (Printed Circuit Board) and a temperature sensor 3.

[0059] The conductive sheet 1 can be a nickel sheet, which has excellent weldability, electrical conductivity and thermal conductivity. Figures 1 to 3 In practice, the conductive sheet 1 can be welded to the conductive bar 5, so as to indirectly realize the electrical connection and thermal conductive coupling between the conductive sheet 1 and the battery cell 6 via the conductive bar 5. In this way, the conductive sheet 1 can collect voltage signals from the electrode terminals 61 of the battery on the one hand, and obtain heat from the battery cell 6 on the other hand and transfer it to the temperature sensor 3 via the PCB board 2 (this will be described in more detail later).

[0060] The PCB board 2 is laminated and fixed on the conductive sheet 1, and the PCB board 2 has: a first surface 2A facing the conductive sheet 1 and thermally coupled with the conductive sheet 1, a second surface 2B opposite to the first surface 2A in the thickness direction of the PCB board 2, a first pad 21, a second pad 22 and a third pad 23 arranged on the second surface 2B, and a conductive circuit that electrically connects the first pad 21 to the conductive sheet 1. The conductive circuit includes a conductive via 26, the first pad 21 is used for welding a voltage acquisition line, and the second pad 22 and the third pad 23 are used for welding a temperature acquisition line.

[0061] The conductive sheet 1 is welded to the PCB board 2. More specifically, the aforementioned conductive circuit also includes a fourth pad, a fifth pad 27 and a fuse 4 which are omitted from the figure. The fourth pad is arranged on the first surface 2A of the PCB board 2, the fifth pad 27 and the fuse 4 are arranged on the second surface 2B of the PCB board 2, and the fourth pad and the fifth pad 27 are arranged opposite to each other along the thickness direction of the PCB board 2. The conductive sheet 1 is welded to the fourth pad, and the aforementioned conductive via 26 electrically connects the fourth pad and the fifth pad 27 in the thickness direction of the PCB board 2. One end of the fuse 4 is welded to the fifth pad 27, and the other end is connected to the first pad 21 via the conductive trace 24. The conductive sheet 1 is welded to the PCB board 2.

[0062] The fuse 4 can be a self-resetting fuse 4 or a blown fuse 4. In practice, the voltage acquisition circuit including the fuse 4 can also be used to perform voltage balancing on the battery. For example, the desired battery voltage can be obtained by charging or discharging the target battery cell 6. At this time, a current will flow through the fuse 4 (as well as the first pad 21 and the conductive sheet 1). When the current is too large, the fuse 4 will be activated to form an overload protection.

[0063] The temperature sensor 3 is thermally mounted on the PCB board 2. Specifically, the temperature sensor 3 is thermally connected to the PCB board 2 in a manner of being arranged close to the second surface 2B of the PCB board 2. In addition, the temperature sensor 3 is electrically connected in series between the second pad 22 and the third pad 23 via the conductive traces 25 and the conductive traces 26.

[0064] The temperature sensor 3 can be an NTC thermistor. When working, the NTC thermistor has a corresponding resistance value based on the temperature of the environment in which it is located. The battery management system BMS can obtain the current resistance value of the NTC thermistor via the temperature acquisition line welded to the second pad 22 and the third pad 23, and determine the NTC thermistor based on the current resistance value and thereby determine the current temperature of the battery cell 6.

[0065] The PCB board 2 is generally rectangular, with a width of no more than 1.5 cm and a length of no more than 2.0 cm. In addition, the conductive sheet 1 has an outer contour of the same configuration as the PCB board 2, and the outer edges of the two are arranged flush.

[0066] The PCB board 2 also has a hollow portion 2C that passes through from the first surface 2A to the second surface 2B, and the conductive sheet 1 is specifically welded to the conductive bar 5 at the hollow portion 2C. In this way, the conductive sheet 1 can be easily welded to the conductive bar 5.

[0067] When observing from the PCB board 2, the geometric center of the PCB board 2 and the geometric center of the conductive sheet 1 both fall into the hollow portion 2C. As a result, the conductive sheet 1 and the conductive bar 5 can be welded at least at the geometric center of the PCB board 2 and the conductive sheet 1, so that all parts of the conductive sheet 1 can be relatively balanced with the conductive bar 5, thereby achieving good thermal conductivity and electrical conductivity.

[0068] exist Figures 1 to 3 In the embodiment shown, the hollow portion 2C is a circumferentially closed hole. In other embodiments, the hollow portion 2C is a notch extending inward from the outer edge of the PCB board 2.

[0069] In addition, the conductive sheet 1 has a protrusion 11 protruding in a direction away from the PCB board 2, and the conductive bar 5 has a slot 51 at a corresponding position, and the protrusion 11 is inserted into the slot 51. In this way, in the process of assembling the signal acquisition component to the conductive bar 5, the protrusion 11 of the conductive sheet 1 can be first inserted into the slot 51 of the conductive bar 5, and then the conductive sheet 1 and the conductive bar 5 are welded. As a result, on the one hand, the pre-welding position of the conductive sheet 1 on the conductive bar 5 can be quickly found and positioned by means of the engagement of the protrusion 11 and the slot 51, and the conductive sheet 1 is prevented from accidentally detaching from the conductive bar 5 when the conductive sheet 1 and the conductive bar 5 are welded in the subsequent sequence. On the other hand, the engagement of the protrusion 11 and the slot 51 also helps to increase the conductive area of ​​the conductive sheet 1 and the conductive bar 5, thereby reducing the connection resistance of the conductive sheet 1 and the conductive bar 5, especially when the surface of the protrusion 11 and the slot wall of the slot 51 elastically abut against each other over a large area.

[0070] exist Figures 1 to 3 In the illustrated embodiment, the locking protrusion 11 is disposed on the outer peripheral side of the hollow portion 2C and is located at a position overlapping with the physical structure of the PCB board 2. In addition, the locking groove 51 is a through groove (or through hole) that penetrates the conductive bar 5 in the thickness direction of the conductive bar 5. The through groove is opposite to the electrode terminal 61 of the battery cell 6, and the locking protrusion 11 of the conductive sheet 1 abuts against the electrode terminal 61 via the through groove. In this way, the locking protrusion 11 of the conductive sheet 1 is in direct electrical and thermal contact with the electrode terminal 61, thereby helping to further reduce the connection resistance and thermal resistance from the electrode terminal 61 to the conductive sheet 1.

[0071] In other embodiments, the locking groove 51 is a non-through groove having a groove bottom, and the groove bottom is spaced a certain distance from the electrode terminal 61 and is located above the electrode terminal 61. Therefore, the locking protrusion 11 cannot directly contact the conductive bar 5.

[0072] Figure 4 FIG. 2 shows a partial cross-sectional schematic diagram of a battery module provided by another embodiment of the present application. Figure 5 yes Figure 4 The schematic diagram of the cross-section structure of the signal acquisition component before it is installed in the battery module. Figure 6 yes Figure 4 Schematic diagram of the three-dimensional structure of the signal acquisition component. Figures 4 to 6 The battery module and signal acquisition components shown have Figures 1 to 3 The battery module and the signal acquisition assembly shown in the figure have similar structures, which can be understood by referring to the above description. For the sake of simplicity, the same or similar components are given the same or similar reference numerals, and the repeated detailed description of the same parts is omitted. Figures 4 to 6 The embodiment shown and Figures 1 to 3 The differences between the illustrated embodiments.

[0073] exist Figures 4 to 6 In the illustrated embodiment, the protrusion 11 is disposed at the hollow portion 2C, and the protrusion 11 is a bent portion formed by stamping the conductive sheet 1, so that the protrusion 11 defines a back groove 12 opening toward the hollow portion 2C - based on the stamping of the conductive sheet 1, a protrusion (i.e., the protrusion 11) is formed on one side of the conductive sheet 1, and a groove (i.e., the back groove 12) is formed on the other side. The protrusion 11, i.e., the aforementioned bent portion, can extend through the conductive sheet 1, i.e., from one end of the conductive sheet 1 to the other end.

[0074] And, in Figures 4 to 6 In the illustrated embodiment, the signal acquisition assembly further includes a housing 7 fixed to the PCB board 2, and the housing 7 can protect the PCB board 2. Moreover, the housing 7 is mounted on the PCB board 2 in a manner of facing the second surface 2B of the PCB board 2 and moving toward the PCB board 2. In this way, the housing 7 can be installed after the welding of the conductive sheet 1 and the conductive bar 5 is completed, thereby facilitating the welding of the conductive sheet 1 and the conductive bar 5. Moreover, the housing 7 can have a protrusion 71 inserted into the back groove 12, and the protrusion 71 is interference-fitted with the aforementioned back groove 12, thereby pressing the back groove 12 outward to cause the clamping protrusion 11 to expand and deform. Due to the expansion and deformation of the clamping protrusion 11, the clamping protrusion 11 squeezes the clamping groove 51, thereby improving the bonding strength between the clamping protrusion 11 and the clamping groove 51, and enhancing the electrical conductivity and thermal conductivity of the conductive sheet 1 and the conductive bar 5. The housing 7 has an opening 72, and the inner periphery of the opening 72 surrounds and abuts against the periphery of the PCB board 2.

[0075] exist Figures 1 to 6 In each of the embodiments shown, the first surface 2A of the PCB board 2 is completely covered by the conductive sheet 1, so that Figure 1 and Figure 4 In the embodiment, the conductive sheet 1 completely separates the PCB board 2 from the conductive bar 5 , and the PCB board 2 does not directly contact the conductive bar 5 .

[0076] But in Figure 7 In another embodiment shown (which can be combined with Figure 4 and Figure 5 After the assembly is completed, the PCB board 2 of the signal acquisition component is also in direct contact with the conductive bar 5, so that the PCB board 2 not only obtains the heat of the conductive bar 5 indirectly through the conductive sheet 1, but also obtains the heat directly from the conductive bar 5. Specifically, the first surface 2A of the PCB board 2 has a sink 2D surrounding the hollow portion 2C and recessed toward the second surface 2B, and the conductive sheet 1 is received in the sink 2D and fixed to the PCB board 2. Therefore, the first surface 2A of the PCB board 2 can be divided into two parts, namely the first part (corresponding to Figure 7 2A) and the second part (corresponding to Figure 7 The figure mark 2A on the lower middle side, wherein the first part is the bottom surface of the sink 2D, and the second part surrounds the sink 2D and the periphery of the conductive sheet 1 (also surrounds the periphery of the first part).

[0077] See also Figure 7 , when the signal acquisition component has not been mounted on the conductive bar 5, the surface 1A of the conductive sheet 1 that is welded against the conductive bar 5 can be slightly lower than the aforementioned second portion of the first surface 2A of the PCB board 2. As a result, when the conductive sheet 1 is welded to the conductive bar 5, the conductive sheet 1 will bulge toward the conductive bar 5 (i.e. Figure 7 The conductive sheet 1 in the elastic deformation state presses the PCB board 2 toward the conductive bar 5, so that the aforementioned second part of the first surface 2A is closely attached to the conductive bar 5, which helps to improve the contact between the PCB board 2 and the conductive bar 5 and thus improve the heat conduction rate between the two. It can be understood that the bending portion (i.e., the cam 11) that runs through the conductive sheet 1 can help the conductive sheet 1 to produce the aforementioned elastic deformation. Specifically, when the conductive sheet 1 is welded to the conductive bar 5, the conductive sheet 1 can be pressed toward the conductive bar 5. Based on the configuration of the bending portion of the conductive sheet 1, the conductive sheet 1 can easily produce elastic deformation toward the conductive bar 5, and thus the two are in contact with each other. In the state where the conductive sheet 1 and the conductive bar 5 remain in contact, the two are welded (for example, laser welding). In this way, after the welding is completed, the conductive sheet 1 in the deformed state applies a biasing force toward the conductive bar 5 to the PCB board 2.

[0078] exist Figure 4In the illustrated embodiment, a low-power wireless communication module 8 is also provided on the second surface 2B of the PCB board 2. The wireless communication module 8 is electrically coupled to the temperature sensor 3 and the nickel sheet, and can transmit the voltage signal and temperature signal detected by the component to the battery management system BMS in a wireless transmission manner.

[0079] In other embodiments, a light-emitting device connected in series between the conductive sheet 1 and the first pad 21 is further provided on the second surface 2B of the PCB board 2. The light-emitting device may be a light-emitting diode (LED). Specifically, the light-emitting device may be connected in series between the fuse 4 and the first pad 21. In this way, when the voltage of the battery cell 6 fluctuates abnormally, for example, the voltage of a battery cell 6 is significantly reduced due to large self-discharge, or the voltage of a battery cell 6 is too high due to excessive charging, the operator can connect the socket common to each battery cell 6 at the tail of the voltage collection harness of the battery module, and the light-emitting diode is connected to the light-emitting circuit powered by the battery cell 6 and illuminated. Because the light-emitting diode can emit light of different brightness in response to different power supply voltages, the operator can evaluate the voltage balance and health of each battery cell 6 by observing the light brightness of the light-emitting diode, and the evaluation work can be performed before the battery module is assembled and the communication and power cables are not connected. In addition, the operator can also check the welding quality of the conductive sheet 1 and the conductive bar 5 on the voltage collection circuit corresponding to the light-emitting diode by observing that the light-emitting diode can be lit. This facilitates the work of the production line and maintenance personnel.

[0080] In addition, the embodiment of the present application also provides a battery pack, which includes a battery module of the above structure, a battery box for accommodating the battery module, a battery management system BMS, a temperature acquisition line and a voltage acquisition line. One end of the voltage acquisition line is welded to the first pad 21, and the other end is connected to the battery management system BMS. Two temperature acquisition lines are provided, one end of the two temperature acquisition lines is respectively welded to the second pad 22 and the third pad 23, and the other end is connected to the battery management system BMS.

[0081] In addition, an embodiment of the present application also provides a method of Figure 7 The method of installing the signal acquisition component to the battery module includes:

[0082] Step 1: Insert the card protrusion 11 into the card slot 51;

[0083] Step 2: At the hollow portion 2C, the conductive sheet 1 is pressed to elastically deform the conductive sheet 1 toward the conductive row 5, and the conductive sheet 1 and the conductive row 5 are welded in a state where the elastically deformed conductive sheet 1 and the conductive row 5 are in contact with each other, so that the PCB board 2 is biased toward the conductive row 5 and in direct contact with the conductive row 5;

[0084] Step three: install the housing 7 onto the PCB board 2 , wherein the protrusion 71 of the housing 7 is inserted into the back groove 12 of the conductive sheet 1 with interference fit.

Claims

1. A signal acquisition component for collecting the voltage and temperature of a battery cell in a battery module, characterized in that: The signal acquisition component comprises: A conductive sheet, which is used to be electrically connected to the electrode terminal of the battery cell and thermally coupled with the battery cell; A PCB board, which is laminated and fixed with the conductive sheet, and comprises: a first surface thermally coupled with the conductive sheet, a second surface opposite to the first surface in the thickness direction of the PCB board, a first pad, a second pad and a third pad arranged on the second surface, and the first pad is electrically connected to the conductive circuit of the conductive sheet; wherein the conductive circuit comprises a conductive via, the first pad is used for welding a voltage collection line, and the second pad and the third pad are used for welding a temperature collection line; a temperature sensor, which is thermally conductively mounted on the PCB and electrically connected in series between the second pad and the third pad; The PCB board has a hollow portion extending from the first surface to the second surface, and the conductive sheet is welded to a conductive bar electrically connected to the electrode terminal of the battery cell at the hollow portion; The conductive sheet has a locking protrusion protruding in a direction away from the PCB board, the conductive row has a locking groove for the locking protrusion to be locked in, the locking protrusion is arranged at the hollow part, and the locking protrusion defines a back groove opening toward the hollow part; The signal acquisition component also includes a shell fixed to the PCB board, the shell has a protrusion inserted into the back groove, wherein the protrusion and the back groove are interference fit, so that the clamping protrusion generates expansion deformation to squeeze the clamping groove.

2. The signal acquisition component according to claim 1, characterized in that: The hollow portion is a circumferentially closed hole, or the hollow portion is a notch extending inward from the outer edge of the PCB board.

3. The signal acquisition component according to claim 1, characterized in that: The housing is mounted on the PCB board in a manner of facing the second surface of the PCB board and moving toward the PCB board.

4. The signal acquisition component according to claim 1, characterized in that: The housing has an opening, and the inner periphery of the opening surrounds and abuts against the periphery of the PCB board.

5. The signal acquisition component according to claim 1, characterized in that: A portion of the first surface is in close contact with the conductive bar, and the conductive sheet has an elastic force that presses the portion of the first surface toward the conductive bar.

6. A battery module, comprising: A battery cell having electrode terminals; A conductive bar welded to the electrode terminal; It is characterized in that the battery module also includes a signal acquisition component as described in any one of claims 1 to 5, and the conductive sheet is electrically connected to the electrode terminal in a manner of being welded to the conductive bar.

7. A battery pack, characterized in that: include: The battery module as claimed in claim 6; A battery box, accommodating the battery module; Battery management system BMS; A voltage collection line, one end of which is welded to the first welding pad, and the other end of which is connected to the battery management system BMS; Two temperature collection lines, one end of each of the two temperature collection lines is welded to the second welding pad and the third welding pad respectively, and the other end of each of the two temperature collection lines is connected to the battery management system BMS.

8. A method for installing a signal acquisition component to a battery module, characterized in that: The signal acquisition component is a signal acquisition component as claimed in any one of claims 1 to 5, the battery module comprises a battery cell having an electrode terminal and a conductive bar having a slot, the conductive bar is electrically connected to the electrode terminal and is in thermal contact with the battery cell, and the method comprises: Inserting the card protrusion into the card slot; Welding the conductive sheet and the conductive bar at the hollow portion; The housing is mounted on the PCB, wherein the protrusion of the housing is inserted into the back groove of the conductive sheet with interference fit.

Images