KR20240027401A - Lithium-ion battery pack for AGV - Google Patents

Abstract

The present invention relates to a lithium-ion battery pack for AGV that is capable of additional load diagnosis in the event of a battery management system (BMS) failure.
BMS including a battery module, a cell voltage measurement unit, a cell balancing unit, a battery module temperature measurement unit, and a BMS unit; Battery module current measuring unit; A charging or discharging voltage detection unit of the battery module; It includes a current control unit that controls the charging or discharging current. The BMS unit performs overcharge or overdischarge judgment, overcurrent judgment, and overheat judgment according to the measured values of each measurement unit, and controls the current control unit to block the charge/discharge current.
In addition, if there is no data transmission signal from the BMS unit, it is recognized as a BMS failure, and then it receives the measured values of the current measurement unit and the voltage detection unit to determine overcurrent, overcharge or overdischarge, and includes a control unit that controls the current control unit. do.
According to the present invention, when the BMS fails, the battery module can be managed through the control unit, thereby preventing damage to the battery.

Description

Lithium-ion battery pack for AGV}

The present invention relates to a lithium-ion battery pack for AGV, and more specifically, to a battery module that enables additional load diagnosis in the event of a battery management system (BMS) failure and improves the ease of coupling of the battery holder.

In general, hybrid vehicles (HEV: Hybrid electric vehicle) and electric vehicles (EV: Electric vehicle) that use electrical energy use a battery composed of a number of rechargeable secondary cells in one pack as the main power source. Because it is used, it has the advantage of producing no exhaust gases and making very little noise.

In this way, in vehicles that use electrical energy, the performance of the battery directly affects the performance of the vehicle, so not only is the charging and discharging of each battery cell efficiently managed by measuring the voltage of each battery cell and the voltage and current of the entire battery. In addition, a battery management system (BMS) that monitors the status of the cell sensing IC that senses each battery cell and enables stable control of the cell is essential.

However, in the conventional battery system, if a failure occurs in the BMS that controls the battery, battery management becomes impossible until the failure is recognized and resolved. Therefore, there is a problem in that damage to the battery cannot be prevented in the event of a BMS failure, and installing additional BMS for double protection may cause malfunction due to complicated circuit connections and may be considered inefficient from a cost perspective. There wasn't.

In terms of the structure of the battery module, the conventional battery holder uses one manufactured to meet the specifications of the pre-designed battery module, so a separate process of manufacturing a holder for each battery module standard was necessary, and thus the specifications of the battery module could be freely adjusted. There was difficulty in making changes.

In addition, the bus bar that electrically connects multiple cells may have fewer contact points with the terminal due to changes in cell alignment or volume, resulting in increased resistance, resulting in energy loss, and lower charging and discharging efficiency. There was a problem that could cause malfunction or malfunction.

Republic of Korea Patent Publication No. 10-2408066 (2022.06.08.) Republic of Korea Patent Publication No. 10-1359710 (2014.01.29.)

In order to solve the above-mentioned problems, the present invention aims to provide a lithium-ion battery pack for AGV that can double prevent damage to the battery module by allowing the battery module to be managed through a control unit in the event of a BMS failure. .

In addition, the purpose is to provide a lithium-ion battery pack for AGV that is easy to assemble and change the specifications of the battery module by improving the shape and coupling structure of the holder.

In addition, the purpose is to provide a lithium-ion battery pack for AGV that can maximize charging and discharging efficiency by improving the contact force with cell terminals through the shape of the bus bar having its own elasticity.

A lithium-ion battery pack for AGV according to an embodiment of the present invention for achieving the above-described object includes a battery module including a plurality of cells, a cell voltage measurement unit that measures the voltage of each of the plurality of cells, and A BMS including a cell balancing unit that performs cell balancing based on the measured value of the cell voltage measuring unit, a temperature measuring unit that measures the temperature of the battery module, and a BMS unit; A current measuring unit that measures the current of the battery module; It includes a current control unit that controls input and output current to be charged or discharged for the battery module; The BMS unit determines overcharge or overdischarge according to the measured value of the cell voltage measurement unit, determines overcurrent according to the measured value of the current measuring unit, and determines overheating according to the measured value of the temperature measuring unit, and the current control unit performs charging or discharging. It is characterized by controlling to block the input/output current.

And a control unit that recognizes when the BMS is malfunctioning and performs load management of the battery module; and a voltage detection unit that detects an input/output voltage being charged or discharged for the battery module; If there is no data transmission signal from the BMS unit, the control unit recognizes that the BMS is broken, receives the measured value of the current measuring unit and the measured value of the voltage sensing unit, determines overcurrent according to the measured value of the current measuring unit, and determines the voltage. Overcharge or overdischarge is determined according to the measurement value of the detection unit, and the current control unit directly controls the charging or discharging input/output current to block.

And the battery module includes a plurality of cells, a holder that fixes the plurality of cells in a predetermined unit, and a bus bar that electrically connects the plurality of cells; The holder includes a plurality of blocks having one or more receiving holes in which one end of a cell is received, and the plurality of blocks are integrally connected. The holder is formed integrally with the sides of blocks adjacent to each other in a first direction and is easily bent. and a cutable gate, and a coupling groove and a coupling protrusion formed on both sides of the block in the second direction, wherein the coupling groove of one side of the block adjacent to each other in the second direction has a coupling protrusion of the other block. It is characterized by comprising a coupling member provided to be coupled by fitting.

In addition, the bus bar is disposed between terminals of cells arranged in multiples of 2, and is connected to a bus body spaced apart from the terminals and a joint that is gently bent from the bus body, has a step with the bus body, and is in contact with the terminal. a cell contact end, including an elastic piece that is bent from the cell contact end into a C-shape or U-shape and has a radius of curvature larger than the step between the bus body and the cell contact end; The cell contact end and the elastic piece are characterized in that they are provided symmetrically to each other in two multiples on the bus body.

In addition, the blocks continuous in the first direction are provided with rivet holes penetrating in the same direction as the receiving holes or clearance holding members protruding from the receiving holes at intersections, and the bus body is provided with fixings corresponding to the rivet holes. A hole and a seating hole corresponding to the clearance holding member are provided at intersections along the longitudinal direction of the bus body, and the bus bar is fixed to the holder through a push rivet that is press-fitted into a rivet hole of the block through the seating hole. It is characterized by .

According to the lithium-ion battery pack for AGV of the present invention, when the BMS that monitors and manages the status of the battery module fails, the control unit recognizes this and monitors the current of the battery module and the input and output voltage during charging and discharging to perform basic load management. It can be done.

Therefore, even in the event of a BMS failure, there is no blank time in the load management of the battery module, and there is a significant effect of doubly preventing battery loss.

And although the battery module holder is made up of multiple blocks integrated through a gate, the gate can be easily broken or bent. Accordingly, the arrangement of the holder can be freely configured by breaking the gate at the desired location.

Therefore, the multiple integrated blocks are easy to separate and assemble, and at the same time, since the blocks are not individually separated from each other, they are easy to handle when forming the structure of the holder, which makes it very easy to change the structure. In addition, since the connection between neighboring blocks is made by fitting, assembly is easy, which has the significant effect of reducing work time.

In addition, the bus bar has its own elasticity as the cell contact end in contact with the cell terminal is bent from the bus body. It is then fixed to the holder while receiving pressure through a push rivet.

Therefore, as the cell contact end of the bus bar is firmly adhered to the cell terminal, the contact resistance is reduced, which has the remarkable effect of maximizing the charging and discharging efficiency of the battery. In addition, the bus bar can be fixed through the fit of push rivets, making battery module assembly simpler.

1 is a block diagram showing the configuration of a lithium-ion battery pack for AGV according to a preferred embodiment of the present invention.
Figure 2 is an exploded perspective view showing the assembly structure of a battery module constituting a preferred embodiment of the present invention.
Figure 3 is a perspective view showing the configuration of a holder constituting a preferred embodiment of the present invention.
Figure 4 is a plan view showing an example of assembly of a holder constituting a preferred embodiment of the present invention.
Figure 5 is a perspective view showing the configuration of a bus bar constituting a preferred embodiment of the present invention.
Figure 6 is a cross-sectional view taken along AA of Figure 5
Figure 7 is a perspective view showing the configuration of a bus bar constituting another embodiment of the present invention.
Figure 8 is a cross-sectional view taken along line BB of Figure 7
Figure 9 is a cross-sectional view showing the installation structure of a bus bar constituting another embodiment of the present invention.
Figure 10 is a perspective view showing the configuration of a bus bar constituting another embodiment of the present invention.
Figure 11 is a cross-sectional view CC of Figure 10

Hereinafter, a preferred embodiment of a lithium-ion battery pack for AGV according to the present invention will be described with reference to the attached drawings.

Figure 1 is a block diagram showing the configuration of a lithium-ion battery pack for AGV according to a preferred embodiment of the present invention.

Referring to FIG. 1, the lithium-ion battery pack for AGV of the present invention largely includes a battery module 10, a BMS 20, a current measurement unit 30, and a current control unit 40.

The battery module 10 is composed of a plurality of secondary battery cells (C, see Figure 2) that can be repeatedly charged and discharged, and has a structure in which a plurality of the cells (C) are combined in a certain arrangement. .

The BMS 20 is for managing the operating status and operating environment of the battery module 10, and includes a cell voltage measurement unit 21, a cell balancing unit 22, a temperature measurement unit 23, and a BMS unit 25. do.

The cell voltage measurement unit 21 measures the voltage of each of the plurality of cells C in real time.

And the cell balancing unit 22 performs cell balancing based on the measured value of the cell voltage measuring unit 21. Cell Balancing is intended to match the charging speed of each cell (C), and can maintain the voltage of each cell at the same level by consuming the current of relatively overcharged cells through a passive method. .

In the present invention, the passive method is presented as an example, but it is not limited thereto. In other words, by applying the active method, cell balancing can be performed to match not only the charging rate but also the discharging rate of each cell.

The temperature measuring unit 23 measures the temperature of the battery module 10 in real time. Here, the temperature measuring unit 23 is an NTC thermistor (NTC-thermistor, Negative Temperature Coefficient-) attached to the surface of the battery module 10, that is, one surface of the protective case 70 (see FIG. 2) of the battery module 10. It can be composed of a thermic resistor).

Meanwhile, the current measuring unit 30 measures the current of the battery module 10 in real time.

And the current control unit 40 serves to control the input/output current that is charged or discharged for the battery module 10. Here, the current control unit 40 may be composed of a Field Effective Transistor (FET).

That is, the current control unit 40 functions to switch the charging or discharging current for the battery module 10 by being turned on/off. Here, the on/off operation of the current control unit 40 is controlled by the BMS unit 25 of the BMS 20.

This current control unit 40 may be configured to include a charging current blocking means and a discharging current blocking means.

In addition, the BMS 20 may be further equipped with a charge/discharge detection unit 24 to determine the charge or discharge state of the battery module 10. The charge/discharge detection unit 24 includes a plurality of detection terminals for detecting charge or discharge voltage, and the BMS unit 25 recognizes the voltage difference between the detection terminals of the charge/discharge detection unit 24 to charge or discharge. Status can be determined.

In addition, the BMS unit 25 turns on/off the current control unit 40 based on real-time measured values of the cell voltage measurement unit 21, temperature measurement unit 23, and current measurement unit 30. Control.

First, the BMS unit 25 detects when the measured value of the cell voltage measurement unit 21 is outside the reference cell voltage value range and blocks the operation of the current control unit 40. That is, if at least one cell among the plurality of cells is outside the reference cell voltage value range, the operation of the current control unit 40 may be blocked.

For example, when the reference cell voltage value range is set to 19V to 29.5V, the BMS unit 25 operates the discharge current blocking means when the lowest value among the simultaneously measured values of the cell voltage measurement unit 21 is less than 19V. Turn off to prevent overdischarge. And, when the highest value among the simultaneously measured values of the cell voltage measuring unit 21 exceeds 29.5V, the charging current blocking means is turned off to prevent overcharging.

At this time, the BMS unit 25 may reflect the result of determining the charging or discharging state based on the measured value of the charging/discharging detection unit 24 for more accurate control of the current control unit 40.

In addition, the BMS unit 25 detects when the measured value of the current measurement unit 30 deviates from the reference current value and blocks the operation of the current control unit 40.

For example, when the reference current value is set to 10A, the BMS unit 25 turns off the current control unit 40 when the measured value of the current measurement unit 30 exceeds 10A to block overcurrent generation. do.

And the BMS unit 25 detects when the measured value of the temperature measuring unit 23 deviates from the standard temperature value and blocks the operation of the current control unit 40.

For example, when the reference temperature value is set to 65°C to determine the overheating state of the battery module 10, if the measured value of the temperature measurement unit 23 exceeds the reference temperature of 65°C, the current control unit Turn off (40) to prevent overheating.

At this time, the BMS unit 25 may turn off both the charging current blocking means and the discharging current blocking means, but the charging current blocking means and Any one of the discharge current blocking means can be selectively turned off.

Additionally, a lower limit reference temperature value for determining the overcooling state of the battery module 10 may be additionally set. For example, when the lower limit reference temperature value is set to 0°C, if the measured value of the temperature measuring unit 23 is less than the reference temperature of 0°C, the current control unit 40 is turned off to maintain the temperature in the supercooled state. Prevent rapid charging and discharging.

Meanwhile, in the present invention, when the BMS 20 is broken, the control unit 50 is configured to perform load management of the battery module 10.

The control unit 50 serves to perform communication so that the battery pack can transmit and receive data with the vehicle device. In the present invention, it prevents loss of the battery module 10 by replacing the failure of the BMS 20. It is configured to further monitor and control for

In order for the control unit 50 to manage the load of the battery module 10, the present invention further includes a voltage detection unit 32 that detects the input/output voltage being charged or discharged for the battery module 10. do.

First, the control unit 50 recognizes that the BMS 20 including the BMS unit 25 is broken when a data transmission signal is not detected from the BMS unit 25.

Subsequently, the control unit 50 notifies the outside world of the failure status of the BMS 20 through the notification unit 60 by outputting a warning sound, turning on a warning light, or outputting a display image.

At the same time, the control unit 50 receives the measured value of the current measuring unit 30 and the measured value of the voltage sensing unit 32, and monitors the state of the battery module 10.

In addition, the control unit 50 detects when the measured value of the current measurement unit 30 deviates from the reference current value, and when it is judged to be overcurrent, the current control unit 40 directly blocks the input/output current being charged or discharged. Perform control.

In addition, the control unit 50 detects when the measured value of the voltage detection unit 32 deviates from the reference voltage value, and when it is determined to be overcharge or overdischarge, the current control unit 40 detects the input/output current to be charged or discharged. Perform direct control to block.

Hereinafter, the detailed configuration of the battery module constituting the lithium-ion battery pack for AGV of the present invention will be described with reference to the drawings.

Figure 2 is an exploded perspective view showing the assembly structure of a battery module constituting a preferred embodiment of the present invention, Figure 3 is a perspective view showing the structure of a holder constituting a preferred embodiment of the present invention, and Figure 4 shows an example of assembly of the holder. It is a floor plan.

Referring to FIGS. 2 and 3, the battery module 10 includes a plurality of cells (C), a holder 100 that fixes the plurality of cells (C) in a predetermined unit, and the plurality of cells (C). It includes a bus bar 200 that is electrically connected.

And the battery module 10, a case 70 for accommodating the battery module 10, and various components electrically connected to the battery module 10 and a mounting cover 80 on which the BMS 20 is mounted. The battery pack 1 is formed by combining.

The holder 100 supports the battery module 10 by fixing the plurality of cells C in a certain arrangement.

Specifically, the holder 100 is composed of a plurality of blocks 110 in which one end of the cell C is accommodated, a gate 120 integrally connecting the plurality of blocks 110, and a neighboring block 110. It includes a coupling member 130 for coupling.

The block 110 is preferably formed in a substantially rectangular parallelepiped shape to facilitate vertical and horizontal arrangement of the plurality of cells C. However, it is not limited to this, and the cells C may have a polygonal pillar shape or a circular pillar shape in order to apply various arrangements.

The block 110 is provided with one or more receiving holes 112 in which one end of the cell C is accommodated.

The receiving hole 112 is for receiving the terminal portion of the cell C and is formed through the block 110. Accordingly, when the cell C is accommodated and fixed in the block 110, the terminal of the cell C is exposed to the outside of the block 110.

Here, in order to allow the cell (C) to be fixed in the correct position in the receiving hole (112), the end of the cell (C) received in the receiving hole (112) and the inside of the receiving hole (112) are each other. An incoming rim 114 and a protruding rim 116 that fit together may be formed along each circumference.

Meanwhile, the holder 100 is made up of a plurality of connected blocks 110, and the blocks 110 are connected through a gate 120 formed integrally.

Referring to the embodiment shown in FIG. 3, the block 110 can fix the cells C in four units in a 2×2 array, and these blocks 110 can be used to form the gate 120. The holder 100 is configured to be integrally connected in a row in a first direction.

Specifically, the gate 120 is formed in the shape of a thin band, and is formed integrally with the side surfaces 111a and 111c of blocks adjacent to each other in the first direction.

The gate 120 may be formed together during injection molding of the holder 100. That is, the gate 120 is formed as a resin band through injection and can be easily bent and cut.

Therefore, the blocks 110 can be easily separated by cutting all the gates 120 connected between neighboring blocks 110. As shown in FIG. 4, only the gate 120a on one side is cut and the gate 120b on the other side is cut. ) By bending the blocks (110b, 110c), the arrangement direction of some blocks (110a, 110b) can be easily changed without completely disconnecting the blocks (110b, 110c).

In addition, the block 110 is provided with engaging grooves 132 and engaging protrusions 134 on both sides 111a and 111c in the second direction, respectively. Here, the second direction is a direction perpendicular to the first direction on a plane, and when the first direction is horizontal, the second direction is vertical.

The coupling groove 132 is formed by entering from one side (111a or 111c) of one block 110, and the coupling protrusion 134 is formed on the other side (111c or 111a) of the surface on which the coupling groove 132 is formed. ) is formed by protruding from the

And the coupling groove 132 and the coupling protrusion 134 are approximately so that the coupling protrusion 134 of the other block can be fitted into the coupling groove 132 of one block adjacent to each other in the second direction. It can be done in a combined form. That is, it is preferable that the coupling groove 132 and the coupling protrusion 134 are not coupled by sliding, but by pressing against each other and fitting.

In addition, the coupling groove 132 and the coupling protrusion 134 change the direction of one block (110a, 110b) among the blocks (110a, 110b, 110c, and 110d) adjacent to each other in the first direction as shown in FIG. When doing so, the consecutive blocks 110a, 110b, 110c, and 110d are provided alternately so that they can be combined with the other blocks 110d and 110c in the second direction.

That is, for example, among the plurality of interconnected blocks (110a, 110b, 110c, 110d), the odd-numbered blocks (110a, 110c) have the coupling grooves (132a, 132c) on one side (111a), When the coupling protrusions (134a, 134c) are provided on the other side (111c), the coupling grooves (132b, 132d) are provided on the other side (111c) in the even-numbered blocks (110b, 110d), and the coupling protrusions (134b) are provided on the other side (111c). , 134d) is provided on one side (111a).

Heat dissipation grooves 113 are formed on other sides 111b and 111d of the block 110 in a depressed shape at the center. The heat dissipation groove 113 guides heat dissipation by forming holes between the blocks 110a, 110b, 110c, and 110d connected to each other.

In addition, the block 110 is provided with a rivet hole 114 penetrating in the same direction as the receiving hole 112 or a clearance holding member 116 protruding from the receiving hole 112.

The rivet hole 114 is provided to couple the bus bar 200, which will be described below, to the holder 100 through a push rivet 118. Referring to FIG. 3, the rivet hole 114 is located at the very center of the upper surface of the block 110.

The gap holding member 116 is provided to prevent the cell C and the bus bar 200 from contacting the case 70 when the battery module 10 is mounted on the case 70. The gap holding member 116 is also located at the very center of the upper surface of the block 110 (see FIG. 3).

The gap holding member 116 protrudes from the upper surface of the block 110 to form a space between the upper surface of the block 110 and the case 70.

The rivet holes 114 and clearance holding members 116 are alternately provided for each of the blocks 110a, 110b, 110c, and 110d consecutive in the first direction.

Meanwhile, a bus bar 200 is coupled to one side of the holder 100. Referring to FIG. 2, the holder 100 is symmetrically provided at the upper and lower ends of the cell C, and the bus bar 200 is located on the upper surface of the upper holder 100 and the lower surface of the lower holder 100. are combined.

The bus bar serves to electrically connect the plurality of cells (C). That is, the bus bar 200 can integrate and transmit the current of the cells C by contacting all terminals of the plurality of cells C.

The bus bar 200 is naturally made of a conductive material and may be made of aluminum.

Hereinafter, the detailed configuration of the bus bar constituting the embodiment of the present invention will be described with reference to the drawings.

Figure 5 is a perspective view showing the configuration of a bus bar constituting a preferred embodiment of the present invention, and Figure 6 is a cross-sectional view taken along line A-A of Figure 5.

Referring to Figures 5 and 6, the bus bar 200 includes a straight bus body 210 and a cell contact end 220 formed in the longitudinal direction of the bus body 210.

The bus body 210 is disposed between terminals of cells C arranged in multiples of two. That is, it is located between the terminals of cells C arranged in two rows, and is spaced apart from the terminals of the cells C.

Cell contact ends 220 in contact with the terminal are connected to both ends of the bus body 210. Here, since the bus body 210 is spaced apart from the terminal and has a step difference from the cell contact end 220, the cell contact end 220 is gently bent from the bus body 210 toward the terminal. It is connected through the joint end (222).

Accordingly, the bus bar 200 has elasticity due to the bent shape of the joint end 222. Accordingly, when the bus body 210 is pressed, the cell contact end 220 is brought into close contact with the terminal. That is, the bus body 210 can be pressed by the gap between the terminal and the bus body 210, and the cell contact end 220 is also pressed.

And the bus body 210 is provided with fixing holes 214 and seating holes 216 alternately along the longitudinal direction of the bus body 210.

The fixing hole 214 corresponds to the rivet hole 114 of the holder 100, and the seating hole 216 corresponds to the clearance holding member 116 of the holder 100. That is, the fixing holes 214 and seating holes 216 are provided alternately along the first direction to correspond to the rivet holes 114 and the gap holding member 116.

Therefore, when coupling the bus bar 200 to the holder 100, the seating position of the bus bar 200 is guided by pressing the seating hole 216 to the clearance holding member 116, and the fixing hole ( 214) is located coaxially with the rivet hole 114.

Accordingly, the bus bar 200 can be easily fixed to the holder 100 through a push rivet 118 that is fitted into the rivet hole 114.

7 to 9 show another example of a bus bar.

Specifically, Figure 7 is a perspective view showing the configuration of a bus bar constituting another embodiment of the present invention, Figure 8 is a cross-sectional view B-B of Figure 7, and Figure 9 is an installation structure of a bus bar constituting another embodiment of the present invention. This is a cross-sectional view showing.

As shown in FIGS. 7 and 8, an elastic piece 230 is further provided at the edge of the cell contact end 220 of the bus bar 200.

The elastic piece 230 is formed by bending from the cell contact end 220 into a C-shape or U-shape. Here, the elastic piece 230 has a radius of curvature larger than the step of the cell contact end 220 of the bus body 210. That is, the height of the elastic piece 230 is higher than the height of the bus body 210.

Referring to FIG. 9, the elastic piece 230 is pressed by the case 70 when the battery module 10 is mounted on the case 70, thereby adding a pressing force to the cell contact end 220. . In addition, it serves as a buffer to prevent shock from being applied to the battery module 10.

Although not shown in the drawing, it is natural that the contact area between the case 70 and the elastic piece 230 is insulated.

In addition, it is most preferable that the cell contact end 220 and the elastic piece 230 are provided symmetrically to each other in a multiple of 2 on the bus body 210.

10 and 11 show another embodiment of a bus bar.

Figure 10 is a perspective view showing the configuration of a bus bar constituting another embodiment of the present invention, and Figure 11 is a cross-sectional view taken along line C-C of Figure 10.

As shown in FIGS. 10 and 11 , the bus bar 200 may be configured to contact four rows of cells C.

For this purpose, the bus body 210 is provided with two pairs of cell contact ends 220 that are symmetrical to each other so that they can contact the four rows of cell (C) terminals in each row, and the elastic piece 230 is By being provided at both edges of the bus bar 200, it can serve as a buffer against shock transmission to the case 70.

Here, the seating hole 216' is formed in the center of the bus body 210, and the fixing hole 214' is formed in the bus body 210 between a pair of symmetrical cell contact ends 220.

Meanwhile, although not shown in the drawing, a nickel strip may be further provided between the cell terminal and the bus bar to maximize the contact point between the terminals and improve electrical conductivity.

According to the lithium-ion battery pack for AGV of the present invention according to the above-described embodiments, when the BMS 20, which monitors the state of the battery module 10, fails, the control unit 50 recognizes this, and the battery module 10 By performing basic load management of the battery module 10 based on the measured values of the current measurement unit 30, which measures the current, and the voltage detection unit 32, which is input and output during charging and discharging, the battery module including the cell C Damage in (10) can be doubly prevented.

And although the holder 100 is made up of a plurality of blocks 110 integrated through the gate 120, the gate 120 can be easily broken or bent. Therefore, the arrangement of the holder 100 can be freely configured by breaking the gate 120 at a desired location.

In addition, the arrangement direction of the blocks 110 can be easily changed by cutting only one gate 120 of the two gates 120 connected between neighboring blocks 110 and bending the other gate 120. there is. Therefore, the blocks 110 of the holder 100 are not individually separated from each other, and handling becomes very easy.

In addition, the bus bar 200 has a cell contact end 220 bent from the bus body 210, and when the bus body 210 is pressed through the push rivet 118, the cell contact end 220 is bent. It is firmly attached to the terminal of the cell (C). Accordingly, the contact resistance is reduced and the charging and discharging efficiency of the battery can be maximized.

In addition, since the push rivets 118 are fitted together, installation of the bus bar 200 becomes very simple.

Furthermore, the height of the cells (C) can be aligned horizontally side by side through the elastic pressure of the bus bar 200, thereby improving the fixing force of the cells (C).

In addition, the elastic piece 230 of the bus bar 200 acts as a buffer to protect the battery module 10 from impact applied to the case 70, and the case 70 and the battery module ( 10) There is a gap between them, which improves heat dissipation performance.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these examples. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of the present invention.

1: Battery pack 10: Battery module
20: BMS 21: Cell voltage measurement unit
22: cell balancing unit 23: temperature measuring unit
24: charge/discharge detection unit 25: BMS unit
30: current measurement unit 32: voltage detection unit
40: current control unit 50: control unit
60: Notification unit 70: Case
80: Mounting cover 100: Holder
110: block 112: receiving hall
113: Heat dissipation groove 114: Rivet hole
116: Gap holding member 118: Push rivet
120: gate 130: coupling member
132: coupling groove 134: coupling protrusion
142: inlet part 144: protruding part
200: bus bar 210: bus body
214: fixing hole 216: seating hole
220: Cell contact end 222: Joint end
230: elastic piece 300: case
400: Mounting cover C: Cell

Claims (5)

A battery module including a plurality of cells, a cell voltage measuring unit that measures the voltage of each of the plurality of cells, a cell balancing unit that performs cell balancing based on the measured value of the cell voltage measuring unit, and measuring the temperature of the battery module. a BMS including a temperature measuring unit and a BMS unit;
A current measuring unit that measures the current of the battery module;
It includes a current control unit that controls input and output current to be charged or discharged for the battery module;
The BMS unit determines overcharge or overdischarge according to the measured value of the cell voltage measurement unit, determines overcurrent according to the measured value of the current measuring unit, and determines overheating according to the measured value of the temperature measuring unit, and the current control unit performs charging or discharging. A lithium-ion battery pack for AGV that is controlled to block the input/output current. According to claim 1,
A control unit that recognizes when the BMS is malfunctioning and performs load management of the battery module; and
It further includes a voltage detection unit that detects an input/output voltage being charged or discharged for the battery module;
If there is no data transmission signal from the BMS unit, the control unit recognizes that the BMS is broken, receives the measured value of the current measuring unit and the measured value of the voltage sensing unit, determines overcurrent according to the measured value of the current measuring unit, and determines the voltage. A lithium-ion battery pack for AGV, characterized in that overcharge or overdischarge is determined according to the measurement value of the detection unit, and the current control unit performs direct control to block the input/output current being charged or discharged. The method of claim 1 or 2,
The battery module includes a plurality of cells, a holder that fixes the plurality of cells in a predetermined unit, and a bus bar that electrically connects the plurality of cells;
The holder is,
A plurality of blocks provided with one or more receiving holes in which one end of the cell is accommodated,
A gate that integrally connects the plurality of blocks, is formed integrally on the sides of blocks adjacent to each other in a first direction, and can be easily bent and cut, and
It includes a coupling groove and a coupling protrusion formed on both sides of the block in the second direction, and the coupling protrusion of the other block is fitted into the coupling groove of one block adjacent to the other block in the second direction. A lithium-ion battery pack for AGV, characterized in that it includes a coupling member. The method of claim 3, wherein the bus bar is:
A bus body disposed between terminals of cells arranged in multiples of two and spaced apart from the terminals,
A cell contact end connected to the bus body through a joint end that is gently bent, has a step with the bus body, and contacts the terminal,
An elastic piece is formed by bending from the cell contact end into a C-shape or U-shape and has a radius of curvature larger than the step between the bus body and the cell contact end;
A lithium-ion battery pack for AGV, characterized in that the cell contact end and the elastic piece are provided symmetrically to each other in a multiple of 2 on the bus body. According to claim 4,
The blocks continuous in the first direction are alternately provided with rivet holes penetrating in the same direction as the receiving holes or clearance holding members protruding from the receiving holes,
In the bus body, fixing holes corresponding to the rivet holes and seating holes corresponding to the clearance holding members are provided alternately along the longitudinal direction of the bus body,
The bus bar is fixed to the holder through a push rivet that is fitted into a rivet hole of the block through the seating hole.

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