Multi-terminal battery

Abstract

The embodiment of the utility model discloses a multi-terminal battery, and relates to the technical field of lithium batteries, the multi-terminal battery comprises a top cover assembly, a shell and a battery cell, the battery cell is arranged in the shell, the top cover assembly covers the open end of the shell, the top cover assembly comprises a wiring terminal and a top cover sheet, the wiring terminal penetrates through the top cover sheet, and the top cover sheet is arranged in the shell. One end of the wiring terminal extends into the shell and is connected with a first element arranged in the shell, the other end of the wiring terminal extends out of the shell and is connected with a second element arranged outside the shell, and the first element and the second element are matched to control the temperature of the battery cell. According to the embodiment of the invention, the timeliness of controlling the internal temperature of the battery is improved.

Description

Technical Field

[0001] This application relates to the field of lithium battery technology, specifically to a multi-terminal battery. Background Technology

[0002] Lithium batteries are widely used in energy storage and power battery fields due to their high specific energy and ability to be recycled multiple times.

[0003] However, excessively high internal temperatures in lithium batteries can increase side reactions in the electrolyte, reducing battery life. Furthermore, excessively high temperatures can cause the separator to melt, leading to internal short circuits and potentially serious safety incidents such as fires and explosions. Excessive internal temperatures can also reduce usable capacity, limit charge and discharge power, cause lithium metal deposition, increase battery impedance, reduce electrolyte conductivity, and lead to other safety issues. Therefore, controlling the internal temperature of lithium batteries is crucial for maximizing battery performance and improving battery safety.

[0004] However, since current lithium batteries on the market are all sealed systems, heating and / or temperature monitoring are typically performed on the surface of the lithium battery, resulting in a certain lag in internal temperature control. Therefore, there is an urgent need for a battery that can solve these problems. Utility Model Content

[0005] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application provides a multi-terminal battery that solves the problem of the inability to timely control the internal temperature of the battery in the prior art.

[0006] The objective of this application can be achieved through the following technical solutions:

[0007] This application provides a multi-terminal battery, which includes a top cover assembly, a housing, and a battery cell. The battery cell is disposed inside the housing, and the top cover assembly covers the open end of the housing. The top cover assembly includes a terminal block and a top cover plate. The terminal block passes through the top cover plate, with one end of the terminal block extending into the housing and connecting to a first element disposed inside the housing. The other end of the terminal block extends to the outside of the housing and connects to a second element disposed outside the housing. The first and second elements cooperate to control the temperature of the battery cell.

[0008] This application provides wiring terminals on the top cover, allowing the first component to be placed inside the housing. The first component can then be directly controlled by the wiring terminals in conjunction with a second component outside the housing, thus avoiding obstruction from the housing and improving the timeliness of controlling the battery temperature.

[0009] Optionally, the top cover assembly further comprises a mounting ring and a base body, the top cover sheet is provided with a mounting hole matched with the mounting ring, the mounting ring is arranged in the mounting hole and fixedly connected with the top cover sheet, and the base body is fixedly arranged in the mounting ring, the terminal is penetrated through the base body and fixed on the base body, and the base body is used for insulatingly connecting the terminal and the top cover sheet.

[0010] A specific connection mode between the terminal and the top cover sheet is provided, the terminal is fixedly arranged on the top cover sheet through the mounting ring, and the terminal and the top cover sheet are insulatingly connected through the base body.

[0011] Optionally, the mounting ring is provided with a first clamping portion and a second clamping portion at two axial ends respectively, the first clamping portion and the second clamping portion are arranged around the inner periphery of the mounting ring, the base body is press-fitted between the first clamping portion and the second clamping portion, and the second clamping portion and the bottom surface of the base body are sealingly connected through a first sealing ring.

[0012] A specific connection mode between the mounting ring and the base body is provided, the mounting ring is press-fitted with the base body through the first clamping portion and the second clamping portion to realize fixed connection with the base body, the assembly between the mounting ring and the base body is facilitated, and the base body is prevented from deforming and falling off in the subsequent use process.

[0013] Optionally, the bottom end of the mounting ring is further provided with a third clamping portion, the third clamping portion is arranged around the outer periphery of the mounting ring, and the third clamping portion is clamped with the bottom surface of the top cover sheet.

[0014] The third clamping portion is arranged to position and arrange the mounting ring on the top cover sheet.

[0015] Optionally, the third clamping portion is welded with the bottom surface of the top cover sheet.

[0016] And / or,

[0017] The first clamping portion is welded with the top surface of the top cover sheet.

[0018] Two specific connection modes between the mounting ring and the top cover sheet are provided, the mounting ring is welded with the top cover sheet through the third clamping portion and / or the first clamping portion to realize sealing and fixed connection between the mounting ring and the top cover sheet.

[0019] Optionally, the terminal comprises a conductive rod, a first fastener and a second fastener, the conductive rod is penetrated through the base body, the first fastener and the second fastener are respectively sleeved on both ends of the conductive rod and lock the conductive rod on the base body, a second sealing ring is arranged between the first fastener and the top surface of the base body, and a third sealing ring is arranged between the second fastener and the bottom surface of the base body.

[0020] A specific structure of the terminal is provided to realize sealing and fixed connection between the terminal and the base body.

[0021] Optionally, the first element comprises a heating element, the second element comprises a switch element and a power supply, and the wiring terminal comprises a first wiring terminal and a second wiring terminal arranged correspondingly, one end of the heating element is connected to the first wiring terminal, the other end of the heating element is connected to the second wiring terminal, and the heating element is connected in series with the switch element and the power supply to form a loop, the power supply is configured to supply power to the heating element, and the switch element is configured to control the power supply to the heating element.

[0022] By arranging the first element as the heating element and the second element as the switch element and the power supply, the heating element can directly heat in the shell, improving the timeliness of the heating element in adjusting the temperature of the battery cell.

[0023] Optionally, the heating element wraps or is arranged inside the battery cell.

[0024] By wrapping or arranging the heating element inside the battery cell, the heating element can quickly heat the battery cell, further ensuring the timeliness of the temperature adjustment of the battery cell.

[0025] Optionally, the first element comprises a temperature acquisition module, the second element comprises a data processing module, and the wiring terminal comprises a third wiring terminal arranged correspondingly, one end of the third wiring terminal is connected to the temperature acquisition module, and the other end of the third wiring terminal is connected to the data processing module, and the data processing module is configured to be communicatively connected to the temperature acquisition module in the shell through the third wiring terminal to acquire the temperature of the battery cell in real time.

[0026] By arranging the first element as the temperature acquisition module and the second element as the data processing module, the temperature acquisition module is located inside the shell, and at this time, the data processing module can directly acquire the temperature of the battery cell through the temperature acquisition module, improving the timeliness of the temperature acquisition of the battery cell.

[0027] Optionally, the first element comprises a heating element and a temperature acquisition module, the second element comprises a switch element, a power supply and a data processing module, the wiring terminal comprises a first wiring terminal, a second wiring terminal and a third wiring terminal arranged correspondingly, the first wiring terminal, the heating element, the second wiring terminal, the switch element and the power supply are connected in series to form a loop, the temperature acquisition module is communicatively connected to the data processing module through the third wiring terminal, and the data processing module is further communicatively connected to the switch element, the data processing module is configured to send a closing signal to the switch element when detecting that the temperature of the battery cell is lower than a temperature threshold, so that the heating element heats the battery cell, and send an opening signal to the switch element when detecting that the temperature of the battery cell exceeds the temperature threshold, so that the heating element stops heating the battery cell.

[0028] By comprising the first element including the heating piece and the temperature acquisition module, the second element including the switching piece, the power supply and the data processing module, and locating the heating piece and the temperature acquisition module in the shell, the data processing module can timely acquire the temperature of the battery cell through the temperature acquisition module, and timely regulate the temperature inside the shell through the heating piece when detecting that the temperature of the battery cell exceeds the threshold value, so as to ensure the timeliness of controlling the temperature of the battery cell.

[0029] Optionally, the multi-terminal battery further comprises a reference electrode arranged in the shell, the wiring terminal comprises a fourth wiring terminal corresponding to the reference electrode, one end of the reference electrode is connected to the fourth wiring terminal, the other end of the reference electrode extends into the battery cell, and the other end of the fourth wiring terminal is used for connecting the voltage acquisition module.

[0030] By arranging the reference electrode in the battery cell, the voltage acquisition module monitors the voltage of the reference electrode through the fourth wiring terminal, so as to dynamically monitor whether the serious safety risk such as lithium precipitation occurs in the charging and discharging process of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0031] The application will be further described below in combination with the drawings.

[0032] Figure 1 is a top view of the multi-terminal battery in one of the embodiments of the application;

[0033] Figure 2 is an axial sectional view of the assembly state of the wiring terminal, the mounting ring and the plastic base in one of the embodiments of the application.

[0034] REFERENCE SIGNS:

[0035] 1, top cover assembly; 10, wiring terminal; 101, conductive rod; 102, first fastener; 103, second fastener; 11, top cover sheet; 12, mounting ring; 13, base body; 14, first clamping part; 15, second clamping part; 16, first sealing ring; 17, third clamping part; 18, second sealing ring; 19, third sealing ring; 20, positive pole; 21, negative pole; 22, explosion-proof valve. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the application will be clearly and completely described below in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0037] Please refer to Figure 1 and Figure 2As shown, in some embodiments, the present application provides a multi-terminal battery, which comprises a top cover assembly 1, a shell (not shown) and a battery cell (not shown). The battery cell is arranged in the shell, and the top cover assembly 1 covers the open end of the shell. The top cover assembly 1 comprises a terminal 10 and a top cover sheet 11, the terminal 10 penetrates the top cover sheet 11, one end of the terminal 10 extends into the shell and is connected with a first element (not shown) arranged in the shell, the other end of the terminal 10 extends to the outside of the shell and is connected with a second element (not shown) arranged outside the shell, and the first element and the second element cooperate to control the temperature of the battery cell.

[0038] The present application sets the terminal 10 on the top cover sheet 11, so that the first element can be arranged inside the shell, and directly controls the temperature of the battery cell by cooperating with the second element outside the shell through the terminal 10, avoiding the obstruction of the shell and improving the timeliness of controlling the temperature of the battery cell.

[0039] In some embodiments, the top cover assembly 1 further comprises a mounting ring 12 and a base 13. The top cover sheet 11 is provided with a mounting hole matched with the mounting ring 12, and the mounting ring 12 is arranged in the mounting hole and fixedly connected with the top cover sheet 11. The base 13 is fixedly installed in the mounting ring 12, and the terminal 10 penetrates the base 13 and is fixed on the base 13, so that the terminal 10 is fixedly and insulatingly connected with the top cover sheet 11.

[0040] In some embodiments, the mounting ring 12 is in the shape of a circular ring, and the mounting ring 12 is provided with a first clamping portion 14 and a second clamping portion 15 at the two axial ends respectively, and the first clamping portion 14 and the second clamping portion 15 are both arranged around the inner periphery of the mounting ring 12. The base 13 is press-fitted between the first clamping portion 14 and the second clamping portion 15, and the second clamping portion 15 is sealingly connected with the bottom surface of the base 13 through a first sealing ring 16.

[0041] Specifically, the first clamping portion 14 and the second clamping portion 15 are both in the structure of a closed loop and both extend radially along the mounting ring 12. Before assembly, the inner diameter of the top end of the mounting ring 12 can allow the base 13 to pass through, so that during assembly, the base 13 can be placed on the second clamping portion 15 from top to bottom, and then the top end of the mounting ring 12 is stamped to form the first clamping portion 14. The first sealing ring 16 is further arranged between the base 13 and the second clamping portion 15, and after the mounting ring 12 is stamped, the first sealing ring 16 is pressed against the base 13 and the second clamping portion 15 to achieve the sealing connection between the base 13 and the mounting ring 12.

[0042] Further, the top surface and the bottom surface of the base 13 are respectively provided with a first clamping groove and a second clamping groove which are adapted to the first clamping portion 14 and the second clamping portion 15. The first clamping portion 14 is clamped in the first clamping groove, and the second clamping portion 15 is clamped in the second clamping groove, so that the top surface and the bottom surface of the mounting ring 12 are substantially flush with the top surface and the bottom surface of the base 13 respectively, facilitating the stamping assembly between the mounting ring 12 and the base 13.

[0043] In some embodiments, the bottom end of the mounting ring 12 is further provided with a third clamping portion 17 which is arranged around the outer periphery of the mounting ring 12. The third clamping portion 17 is clamped with the bottom surface of the top cover sheet 11, so as to increase the connection strength between the mounting ring 12 and the top cover sheet 11.

[0044] Specifically, the third clamping portion 17 is a closed loop structure and extends radially along the mounting ring 12. The bottom surface of the top cover sheet 11 is provided with a third clamping groove (not shown) which is adapted to the third clamping portion 17. During assembly, the mounting ring 12 is inserted into the mounting hole from bottom to top until the third clamping portion 17 is clamped into the third clamping groove, so as to position the assembly between the mounting ring 12 and the top cover sheet 11.

[0045] In some embodiments, the third clamping portion 17 is welded with the bottom surface of the top cover sheet 11; and / or the first clamping portion 14 is welded with the top surface of the top cover sheet 11, so as to seal and fixedly connect the mounting ring 12 to the top cover sheet 11.

[0046] In some embodiments, the mounting ring 12 can be made of aluminum, copper or steel, so as to fixedly connect the mounting ring 12 to the top cover sheet 11. The base can be made of plastic, silicone rubber or rubber.

[0047] In some embodiments, the terminal 10 comprises a conductive rod 101, a first fastener 102 and a second fastener 103. The conductive rod 101 penetrates through the base 13. The first fastener 102 and the second fastener 103 are respectively sleeved on both ends of the conductive rod 101 and lock the conductive rod 101 on the base 13. A second sealing ring 18 is arranged between the first fastener 102 and the top surface of the base 13, and a third sealing ring 19 is arranged between the second fastener 103 and the bottom surface of the base 13.

[0048] Specifically, the first fastener 102 and the second fastener 103 are respectively screwed with both ends of the conductive rod 101, and the first fastener 102 abuts against the top surface of the base body 13, and the second fastener 103 abuts against the bottom surface of the base body 13, so as to lock the conductive rod 101 on the base body 13. The second sealing ring 18 is pressed to abut against the top surface of the first fastener 102 and the base body 13, so as to realize the sealed connection between the first fastener 102 and the base body 13. The third sealing ring 19 is pressed to abut against the bottom surface of the second fastener 103 and the base body 13, so as to realize the sealed connection between the second fastener 103 and the bottom surface of the base body 13. Through the structural cooperation of the first fastener 102, the second fastener 103, the second sealing ring 18 and the third sealing ring 19, the sealed connection between the conductive rod 101 and the base body 13 is further realized.

[0049] In some embodiments, the first fastener 102 and the second fastener 103 are both selected as nuts, and both ends of the conductive rod 101 extend out from the end of the first fastener 102 and the second fastener 103 away from the plastic base, so as to connect the conductive rod 101 with the external unit.

[0050] In some embodiments, the first element includes a heating element, and the second element includes a switch element and a power supply. At this time, the terminal 10 includes a first terminal 10 and a second terminal 10 arranged correspondingly, one end of the heating element is connected to the first terminal 10, and the other end is connected to the second terminal 10, and the heating element is connected in series with the switch element and the power supply to form a loop. When the temperature of the battery cell is lower than the temperature threshold, the switch element is opened, the power supply supplies power to the heating element, so that the heating element heats the battery cell inside the shell; when the temperature of the battery cell is higher than the temperature threshold, the switch element is disconnected, the power supply stops supplying power to the heating element, and the heating element stops heating the battery cell.

[0051] Optionally, the power supply can be the multi-terminal battery itself. At this time, the top cover assembly 1 further includes positive / negative poles 20 / 21, the positive / negative poles 20 / 21 penetrate the top cover sheet 11, one end of the positive / negative poles 20 / 21 inside the shell is connected with the battery cell, one of the first terminal 10 and the second terminal 10 is connected with the positive pole 20, and the other is connected with the negative pole 21. The switch element is connected between the first terminal 10 and the positive / negative poles 20 / 21, or connected between the second terminal 10 and the positive / negative poles 20 / 21.

[0052] Optionally, the power supply can also be an external power supply outside the multi-terminal battery.

[0053] In some embodiments, the heating element can be wrapped outside the battery cell, or can be arranged inside the battery cell.

[0054] Specifically, in the case that the heating element is arranged inside the battery cell:

[0055] When the electric core is a laminated body, the heating piece is arranged between the plurality of laminated pieces.

[0056] When the electric core is a winding body, the heating piece is arranged between the positive and negative laminated pieces, and the positive and negative laminated pieces are wound from one end to form a winding electric core to surround the heating piece. Or, the heating piece is wound together with the positive and negative laminated pieces, and extends out from the free end of the winding electric core after the winding electric core is formed.

[0057] In some embodiments, a plurality of groups of electric cores can be arranged in the shell, and the heating piece can be arranged between the plurality of groups of electric cores.

[0058] In another embodiment, the first element includes a temperature acquisition module, and the second element includes a data processing module. At this time, the wiring terminal 10 includes a third wiring terminal 10 arranged correspondingly, and the data processing module can be connected in communication with the temperature acquisition module in the shell through the third wiring terminal 10, so as to collect the temperature of the electric core in real time and ensure the timeliness of collecting the temperature of the electric core.

[0059] Further, the temperature acquisition module is arranged in plurality, and different temperature acquisition modules are arranged on a plurality of detection points in the electric core, so as to monitor the temperature distribution of the electric core under different working conditions.

[0060] Specifically, the temperature acquisition module can be arranged on the laminated piece at the middle position of the electric core, and 4, 5 or 9 detection points can be arranged in array on the laminated piece at the middle position.

[0061] Optionally, the temperature acquisition module can be a thermocouple, a thermal resistance and a semiconductor temperature sensor, etc.

[0062] In still another embodiment, the first element includes a heating piece and a temperature acquisition module, the second element includes a switch, a power supply and a data processing module, and the wiring terminal 10 includes a first wiring terminal 10, a second wiring terminal 10 and a third wiring terminal 10 arranged correspondingly. The first wiring terminal 10, the heating piece, the second wiring terminal 10, the switch and the power supply are connected in series to form a loop. The temperature acquisition module is connected in communication with the data processing module through the third wiring terminal 10, and the data processing module is also connected in communication with the switch.

[0063] Specifically, the data processing module is connected in communication with the temperature acquisition module in the shell through the third wiring terminal 10, so as to detect the temperature of the electric core in the shell in time through the temperature acquisition module. When the detected temperature is lower than a temperature threshold, the data processing module sends a closing signal to the switch, so that the heating piece is heated to increase the temperature of the electric core. When the detected temperature exceeds the temperature threshold, the data processing module sends an opening signal to the switch, so that the heating piece stops heating the electric core, thereby ensuring the timeliness of controlling the temperature of the electric core.

[0064] In some embodiments, the multi-terminal battery further comprises a reference electrode (not shown) arranged in the shell, the terminal 10 comprises a fourth terminal 10 corresponding to the reference electrode, one end of the reference electrode is connected to the fourth terminal 10, and the other end of the reference electrode extends into the battery cell, and the other end of the fourth terminal 10 is used to connect the voltage acquisition module.

[0065] The voltage acquisition module can monitor the voltage of the reference electrode through the fourth terminal 10, so as to dynamically monitor whether a serious safety risk such as lithium precipitation occurs in the charging and discharging process of the battery cell.

[0066] In some embodiments, the top cover sheet 11 further comprises an explosion-proof valve 22 arranged in the middle part, when the internal pressure or temperature of the shell exceeds a set value, the explosion-proof valve 22 will break at the notch and release pressure, so as to reduce the internal pressure of the shell and avoid explosion accidents.

[0067] In the present application, the number of the terminal 10 can be adaptively set according to the actual structure inside the shell, and is not specifically limited here.

[0068] The above describes one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the patent coverage of the present application.

[0069] It should be noted that the "first", "second" and similar words used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. The description of the present application with respect to "left", "right", "left side", "right side", "upper part", "lower part", "top", "bottom" and the like are defined based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the structure must be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined and limited.

[0070] In the description of the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A multi-terminal battery, characterized by, The multi-terminal battery comprises a top cover assembly, a shell and a battery cell, the battery cell is arranged in the shell, and the top cover assembly covers the open end of the shell, wherein the top cover assembly comprises a terminal and a top cover sheet, the terminal penetrates the top cover sheet, one end of the terminal extends into the shell and is connected with a first element arranged in the shell, the other end of the terminal extends to the outside of the shell and is connected with a second element arranged outside the shell, and the first element and the second element cooperate to control the temperature of the battery cell.

2. The multi-terminal battery of claim 1, wherein, The top cover assembly further comprises a mounting ring and a base body, the top cover sheet is provided with a mounting hole matched with the mounting ring, the mounting ring is arranged in the mounting hole and fixedly connected with the top cover sheet, and the base body is fixedly installed in the mounting ring, the terminal penetrates the base body and is fixed on the base body, and the base body is used for insulatingly connecting the terminal and the top cover sheet.

3. The multi-terminal battery of claim 2, wherein, The mounting ring is provided with a first clamping portion and a second clamping portion at the two axial ends respectively, the first clamping portion and the second clamping portion are arranged around the inner periphery of the mounting ring, the base body is press-fitted between the first clamping portion and the second clamping portion, and the second clamping portion is sealingly connected with the bottom surface of the base body through a first sealing ring.

4. The multi-terminal battery of claim 3, wherein, The mounting ring is provided with a third clamping portion at the bottom end, the third clamping portion is arranged around the outer periphery of the mounting ring, and the third clamping portion is clamped with the bottom surface of the top cover sheet.

5. The multi-terminal battery of claim 4, wherein, The third clamping portion is welded with the bottom surface of the top cover sheet. And / or, The first clamping portion is welded with the top surface of the top cover sheet.

6. The multi-terminal battery of claim 2, wherein, The terminal comprises a conductive rod, a first fastener and a second fastener, the conductive rod penetrates the base body, the first fastener and the second fastener are respectively sleeved on the two ends of the conductive rod and lock the conductive rod on the base body, a second sealing ring is arranged between the first fastener and the top surface of the base body, and a third sealing ring is arranged between the second fastener and the bottom surface of the base body.

7. The multi-terminal battery of claim 1, wherein, The first element comprises a heating element, the second element comprises a switch element and a power supply, the terminal comprises a first terminal and a second terminal arranged correspondingly, one end of the heating element is connected with the first terminal, the other end of the heating element is connected with the second terminal, and the heating element is connected with the switch element and the power supply in series to form a loop, the power supply is used for supplying power to the heating element, and the switch element is used for controlling the power supply of the heating element.

8. The multi-terminal battery of claim 7, wherein, The heating element wraps or is arranged inside the battery cell.

9. The multi-terminal battery of claim 1, wherein, The first element comprises a temperature acquisition module, the second element comprises a data processing module, the terminal comprises a third terminal arranged correspondingly, one end of the third terminal is connected with the temperature acquisition module, and the other end of the third terminal is connected with the data processing module, and the data processing module is configured to be communicatively connected with the temperature acquisition module in the shell through the third terminal to acquire the temperature of the battery cell in real time.

10. The multi-terminal battery of any one of claims 1 to 9, wherein, The multi-terminal battery further comprises a reference electrode arranged in the shell, the wiring terminal comprises a fourth wiring terminal corresponding to the reference electrode, one end of the reference electrode is connected to the fourth wiring terminal, the other end of the reference electrode extends into the battery cell, and the other end of the fourth wiring terminal is used for connecting a voltage acquisition module.

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