TWI462375B - Battery module having a structure for coupling a circuit board and battery devices - Google Patents

Description

Battery module having electrical connection structure between circuit board and battery device

The present invention relates to a battery module, and more particularly to a battery module having an electrical connection structure between a circuit board and a battery device.

With the advancement of technology, transportation vehicles have evolved from using gasoline as a fuel for gasoline and locomotives to using natural gas as fuel for automobiles. As a power supply for steam and locomotives, steam and locomotives have been used, and bicycles have traditionally been driven by human resources. The machine acts as a power source for the bicycle to operate. Of course, with the gradual reduction of fuel raw materials, rising prices, and rising awareness of environmental protection, vehicles such as electric bicycles, electric locomotives, and electric vehicles have been developed.

However, with the development of transportation vehicles and the importance of electric transportation vehicles facing the green energy industry, battery modules that provide transportation vehicle power have become an important component.

Figure 1 shows a conventional battery module. As shown in FIG. 1 , the battery module 100 includes a plurality of battery devices 110 , a circuit board 120 , and a plurality of voltage lines 130 and at least one connector 131 . Each battery device 110 includes a plurality of battery cells 111 and two electrode sheets 112. The battery cells 111 in a battery device 110 pass through After the electrode sheets 112 are connected in series or in parallel, they are connected in series or in parallel with the other battery devices 110 to form the entire battery module 100.

If an abnormality occurs in the battery core 111 in one of the battery devices 110, the voltage imbalance of the battery device 110 may be caused, thereby affecting the life of the entire battery module 100. In order to detect whether the voltage of each battery device 110 is abnormal in the battery module 100, as shown in FIG. 1, in the past, a pin 113 of the electrode pad 112 of each battery device 110 is used for welding or lap welding. The voltage line 130, the other end of each voltage line is connected to a connector 131 to form a row of wires. The connector 131 is then plugged into another connector on the circuit board 120. The circuit board 120 is provided with a voltage detecting unit and a chip set (IC). With the above design, the voltage of each battery device 110 can be collected into the voltage detecting unit of the circuit board 120, and the voltage detecting unit can further transmit the voltage values to the chipset (IC) through the circuit of the circuit board 120. To monitor these voltages.

However, the pins 113 of the electrode pads 112 are soldered or lapped to the voltage lines 130 to transfer the voltage of the battery device 110. A plurality of voltage lines 130 and connectors 131 must be used to transfer the voltage of each of the battery devices 110. As a result, the manufacturing cost is increased, and in the assembly, the voltage lines 130 must be arranged and the connector 131 and the other connector are inserted, which causes inconvenience in assembly and also causes an increase in production time.

More particularly, when other wires (not shown) for connecting to the outside are included, the wires and voltage lines in the entire battery module 100 are more disorderly. It also makes assembly difficult.

Therefore, how to save the material of the voltage transfer to the wafer set while providing a simplified structure of the fixed circuit board 120 and allowing the chip set to receive the voltages of the battery devices 110 is a problem worthy of discussion at present.

An object of one embodiment of the present invention is to provide a battery module. An object of an embodiment of the present invention is to provide a battery module having an electrical connection structure between a circuit board and a battery device. In an embodiment, the configuration of the aforementioned electrical connection structure can be simplified, and the procedure for assembling the electrical connection structure can be simplified.

According to an embodiment of the invention, a battery module includes a plurality of battery devices, a first fixed housing, a circuit board, and a second fixed housing. Each battery device includes a plurality of battery cells and at least one electrode sheet. The electrode sheet includes a body portion for electrically connecting the battery cells; and a pin extending from the body portion of the electrode sheet. The first fixed case is used to fix the battery devices. The circuit board includes at least one connection pad on a surface of the circuit board. The second fixing case houses the circuit board and includes a plurality of sidewalls, a bottom plate, at least one guiding structure and at least one guiding hole. The sidewalls surround the bottom plate and extend from the bottom plate to define an accommodation space. The guiding structure extends from the bottom plate in the accommodating space. The guiding hole is located at the bottom plate and the positions of the guiding hole and the guiding structure correspond to each other. And the pin of the electrode piece passes through the guiding hole, extends along the guiding structure, and is electrically connected to The connection pads of the board.

In an embodiment, the circuit board further defines at least one positioning groove, and the position of the positioning groove corresponds to the position of the connection pad. The guiding structure is positioned in the positioning groove to position the circuit board and position the connection pad corresponding to the position of the guiding structure.

In one embodiment, the guiding structure has a first side and a second side, the first side is opposite to the second side, and the second side is toward the inner side of the second fixed shell, and the first side faces the second fixed shell Outside. And the pin self-guide hole extends along the first side of the guiding structure away from the bottom plate, and then a top end of the guiding structure extends along the second side of the guiding structure toward the bottom plate, and the pin A free end is located on the connection pad.

In one embodiment, the free ends of the pins of the electrode sheets define a consistent perforation and the free ends of the pins are soldered to the connection pads via a solder.

In one embodiment, the pin of the electrode sheet further includes a buffer portion located between the free end of the pin and the body portion. In one embodiment, the buffer portion protrudes from a side surface of the pin. Preferably, the buffer portion is formed in an arc shape, a V shape or a U shape.

In one embodiment, at least one of the sidewalls is further defined with at least one window, and the position of the window corresponds to the position of the guiding structure.

In an embodiment, the second fixed case further includes an outer sidewall, the outer sidewall is located outside the first sidewall of the sidewalls, and the first sidewall and the outer sidewall A long groove is formed between the strips. Preferably, a second side wall of the side walls further defines an opening, and the opening is located at a bottom end of the elongated groove along a longitudinal direction thereof.

According to an embodiment of the invention, since the second fixing shell is provided with at least one guiding structure and at least one guiding hole, the pins of the electrode sheets can be effectively guided, so that the free end of the pins can be located in the circuit. The connection pads of the board. In this way, in addition to omitting the voltage lines in the prior art, it is possible to simplify the electrical connection structure and the electrical connection procedure between the circuit board and the plurality of battery devices, thereby reducing manufacturing costs and reducing assembled battery modules. Working hours.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein. The above and other objects, features, and advantages of the invention will be apparent from

In the description of the following description, the use of "coupled to B" or "connected to B" is the direct coupling or electrical connection of the nail to B; or the indirect coupling of a substance or object between A and B or Electrically connected to B, so that A and B can conduct electricity. In addition, terms such as "contact with B" are used, and embodiments including direct contact or indirect contact are used.

2 shows an exploded view of a battery module in accordance with an embodiment of the present invention. As shown As shown in FIG. 2 , the battery module 200 includes a plurality of battery devices 210 , a circuit board 220 , a first fixed housing 231 , and a second fixed housing 232 .

Each battery device 210 includes a plurality of battery cells 211 and two electrode sheets 212. In the battery device 210, the battery cells 211 are connected in series or in parallel through the electrode pads 212, and then connected in series or in parallel with the other battery devices 210 to form the entire battery module 200.

3A is a schematic view showing an electrode sheet according to an embodiment of the present invention. As shown in FIG. 3A, the electrode sheet 212A includes a body portion 221, a pin 222, and a uniform through hole 223. The body portion 221 is for electrically connecting one end of the battery core 211, the pin 222 is extended from the body portion 221, and the free end side of the pin 222 further defines the through hole 223.

Fig. 3B is a schematic view showing an electrode sheet according to another embodiment of the present invention. The electrode sheet 212B of Fig. 3B is similar to the electrode sheet 212A of Fig. 3A, and therefore the same elements are denoted by the same reference numerals and their description will be omitted. As shown in FIG. 3B, the electrode sheet 212B further includes a buffer portion 224. The buffer portion 224 of the present embodiment is protruded from one side surface of the pin 222. Preferably, the buffer portion 224 is formed in an arc shape, and the buffer portion 224 is located between the body portion 221 and the through hole 223. In one embodiment, the buffer portion 224 is closer to the body portion 221 side, or the distance between the buffer portion 224 and the body portion 221 is smaller than the distance between the buffer portion 224 and the through hole 223. In the present embodiment, the buffer portion 224 can effectively prevent the pin 222 from being broken. In the present invention, the buffer portion 224 is not limited to an arc shape, and in another embodiment, As shown in FIG. 3C and FIG. 3D, the buffer portion 224 may have a V shape or a U shape, and the pin 222 can be effectively prevented from being broken. It should be understood that the present invention is not limited to the shape in which the buffer portion 224 is provided, as long as the shape of the buffer portion 224 in which the pin 222 is broken can be effectively prevented.

Referring to FIG. 2 , the battery device 210 is disposed inside the first fixed case 231 and fixed by the first fixed case 231 , and the circuit board 220 is disposed in the second fixed case 232 . The first fixed case 231 and the second fixed case 232 can be assembled and fixed by a fixing member (not shown) such as a twisted wire.

4A to 4B are partially enlarged schematic views showing one step of fixing the circuit board 220, respectively. As shown in FIG. 4A and FIG. 2, the circuit board 220 includes at least one positioning recess 241 and a circuit layout. The circuit layout includes at least one connection pad 242. The connection pad 242 is located on the surface of the circuit board 220, and preferably The position of the positioning groove 241 corresponds to the position of the connection pad 242. The second fixing shell 232 includes a plurality of sidewalls 321 , a bottom plate 322 , at least one guiding structure 311 , and at least one guiding hole 312 . The sidewalls 321 extend around the bottom plate 322 and extend from the bottom plate 322 to define an accommodating space 323. The guiding structure 311 extends from the bottom plate 322 in the accommodating space 323, and the guiding hole 312 is located at the bottom plate 322. The positions of the guiding hole 312 and the guiding structure 311 correspond to each other, and the guiding hole 312 is located at the guiding structure 311. Between the side wall 321 closest to the guiding structure 311.

As shown in FIG. 4A and FIG. 2, the circuit board 220 is disposed on the second fixed case. The position of the positioning groove 241 of the circuit board 220 corresponds to the position of the guiding structure 311 of the second fixed case 232 in the accommodating space 323 of the 232. And the guiding structure 311 is positioned in the positioning groove 241, and more specifically, at least a part of the guiding structure 311 is located in the positioning groove 241. The circuit board 220 can be positioned in the second fixed housing 232 through the positioning recesses 241 and the guiding structures 311. As such, the position of each of the connection pads 242 can be made to correspond to the position of the guiding structure 311. The guiding structure 311 further has a first side and a second side, wherein the first side and the second side thereof are respectively located on opposite sides, and the second side of the guiding structure 311 faces the inside of the second fixing shell 232.

As shown in FIG. 4A and FIG. 4B , referring to FIG. 4A , the pins 222 of the electrode pads 212 pass through the guiding holes 312 and extend upward along the first side guiding holes 312 of the guiding structure 311 . That is, it extends in a direction away from the bottom plate 322. Referring to FIG. 4B , the pin 222 extends along the guiding structure 311 through the guiding holes 312 and is electrically connected to the connecting pad 242 of the circuit board 220 .

More specifically, one end of the pin 222 on the connection pad 242 can be defined as a free end of the pin 222. The pin 222 is bent along the guiding structure 311 such that the free end of the pin 222 faces the inside of the second fixing shell 232, and the free end of the pin 222 is along the second side of the guiding structure 311. The top end is bent downward, that is, bent toward the bottom plate 322. After the free end of the pin 222 approaches or contacts the bottom plate 322, the pin 222 is free again. The end extends along the bottom plate 322 toward the second fixed casing 232.

At this time, the free end of the pin 222 is located on the connection pad 242 of the circuit board 220 through the guiding of the guiding structure 311. The free end of the pin 222 can then be soldered to the connection pad 242 by soldering. Preferably, the free end of the pin 222 further has a through hole 223, so that the solder can flow from the periphery of the through hole 223 and the free end of the pin 222 to the gap between the free end of the pin 222 and the connection pad 242. The free end of the pin 222 can be soldered to the connection pad 242 more efficiently and quickly.

5A is a top plan view showing a second fixed case of a battery module in accordance with an embodiment of the present invention. Figure 5B shows a side view of a battery module mounted with a second fixed housing of the embodiment of Figure 5A. According to the experiment in which the inventors actually assembled the battery module 200, it was found that in the assembly process, the situation in which the pin 222 passes through the through hole 223 cannot be observed, resulting in an increase in assembly man-hours. Therefore, as shown in FIG. 5A and FIG. 5B, at least one window 331 is defined on the sidewall 321 of the second fixed casing 232. The position of the window 331 corresponds to the position of the guiding structure 311, so that the operator assembles the battery module 200. The process of the pin 222 of the battery device 210 passing through the guiding hole 312 can be clearly observed, and the position of the pin 222 can be adjusted at an appropriate time so that the pin 222 can smoothly pass through the guiding hole 312 and from the bottom plate. 322 extends out. As a result of the actual test by the inventors, the addition of the window 331 can effectively reduce the man-hours of assembling the battery module 200. In the present specification, the window means that the operator can observe the connection of the battery device 210. The opening structure of the foot 222. It should be understood that, in an embodiment of the present invention, the window 331 may not be provided, and in an embodiment, the number, shape, number, position, and arrangement of the windows 331 may be further adjusted according to product specifications.

It should be understood that the present invention does not limit the number of setting windows 331. In an embodiment, a window 331 can be associated with a guiding structure 311. In another embodiment, the window 331 can be disposed on one side wall 321 of the second fixed casing 232, and no window 331 is disposed on the other side wall 321 of the side wall 321 . In another embodiment, at least one window 331 may be selectively disposed on the sidewalls 321 on opposite sides.

During the assembly process, as described above, the position of the pin 222 is continuously adjusted, and sometimes the tension is sometimes bent and sometimes bent, so that the pin 222 is easily broken, and after the buffer portion 224 is added, the buffer is permeable. The buffering of the portion 224 can be effectively verified to reduce the breakage of the pin 222.

In addition, referring to FIG. 5A , in an embodiment, the second fixing shell 232 further includes an outer sidewall 324 located outside the sidewall 321 of the second fixing shell 232 , and the outer sidewall 324 and the sidewall 321 are formed to be elongated. Groove 325. In one embodiment, the battery module 200 further includes a cover and a plurality of wires connected to the circuit board 220 and the connector disposed on the cover for electrically connecting the battery module 200 to the outside. . After the wires are connected to the circuit board 220, they are extended into the recesses 325, and then extend along the long axis of the recess 325, passing through an opening 326 at the bottom end of the long axis direction of the recess 325, and then extending. Extend to the connector on the cover. Through the groove 325, the wires can be arranged or fixed, so that the wires of the battery module 200 are not scattered in the casing. The opening 326 is defined by the other sidewall 321 , and the other sidewall 321 is perpendicular to the sidewall 321 of the corresponding outer sidewall 324 .

According to an embodiment of the present invention, since the second fixing shell 232 is provided with at least one guiding structure 311 and at least one guiding hole 312, the pins 222 of the electrode sheets 212 can be effectively guided, so that the pins 222 are provided. The free end can be accurately positioned on the connection pad 242 of the circuit board 220. Through such a design, in addition to omitting the voltage line 130 and the connector 131 in the prior art, the electrical connection structure and the electrical connection procedure between the simplified circuit board 220 and the plurality of battery devices 210 can be simplified, and the electrical connection can be simplified. The structure can remove the cost of the voltage line and the connector, and the simplified electrical connection procedure can reduce the man-hours of assembling the battery module 200. In addition, since the pin 222 is formed in a concave shape and the guiding structure 311 is formed into a convex shape, that is, the shape of the pin 222 and the shape of the guiding structure 311 are matched with each other, the function of the positioning pin 222 is provided, so that the pin 222 and the circuit board The soldering structure between the connection pads 242 of 220 can withstand large oscillations and is not easily separated, and the reliability of the electrical connection structure between the circuit board and the battery device is high.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application. In addition, any of the present invention The full scope or advantages or features of the invention are not to be construed as a limitation. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention.

100‧‧‧ battery module

110‧‧‧ battery device

111‧‧‧ battery core

112‧‧‧electrode

113‧‧‧ pins

120‧‧‧ boards

130‧‧‧voltage line

131‧‧‧Connector

200‧‧‧ battery module

210‧‧‧Battery device

211‧‧‧ battery core

212‧‧‧electrode

212A‧‧‧electrode

212B‧‧‧electrode sheet

220‧‧‧Circuit board

221‧‧‧ Body Department

222‧‧‧ feet

223‧‧‧through holes

224, 224a, 224b‧‧‧ buffer

231‧‧‧First fixed shell

232‧‧‧Second fixed case

241‧‧‧ positioning groove

242‧‧‧Connecting mat

311‧‧‧Guide structure

312‧‧‧ Guide hole

321‧‧‧ side wall

322‧‧‧floor

323‧‧‧ accommodating space

324‧‧‧Outer side wall

325‧‧‧ Groove

326‧‧‧ openings

331‧‧‧ Window

1 shows a perspective view of a conventional battery module.

2 shows an exploded view of a battery module in accordance with an embodiment of the present invention.

3A is a schematic view showing an electrode sheet according to an embodiment of the present invention.

Fig. 3B is a schematic view showing an electrode sheet according to another embodiment of the present invention.

Fig. 3C is a schematic view showing a buffer portion of an electrode sheet according to an embodiment of the present invention.

Fig. 3D is a schematic view showing a buffer portion of an electrode sheet according to another embodiment of the present invention.

4A to 4B are respectively partially enlarged schematic views showing one step of fixing a circuit board.

5A is a top plan view showing a second fixed case of a battery module in accordance with an embodiment of the present invention.

Figure 5B shows a side view of a battery module mounted with a second fixed housing of the embodiment of Figure 5A.

220‧‧‧Circuit board

222‧‧‧ feet

223‧‧‧through holes

241‧‧‧ positioning groove

242‧‧‧Connecting mat

311‧‧‧Guide structure

312‧‧‧ Guide hole

321‧‧‧ side wall

331‧‧‧ Window

Claims (10)

A battery module comprising: a plurality of battery devices, each battery device comprising: a plurality of battery cells; and at least one electrode plate comprising a body portion and a pin for electrically connecting the battery cells And the first extension housing is configured to fix the battery devices; a circuit board comprising at least one connection pad on a surface of the circuit board; and a second a fixed case, and the circuit board is disposed in the second fixed case, wherein the second fixed case comprises: a plurality of side walls; a bottom plate surrounding the bottom plate and extending from the bottom plate to define an accommodation At least one guiding structure extending from the bottom plate in the accommodating space; and at least one guiding hole is located at the bottom plate, and the guiding holes and the guiding structure are corresponding to each other, and the at least The pin of an electrode sheet passes through the at least one guiding hole, extends along the at least one guiding structure, and is electrically connected to the circuit board The at least one connection pad. The battery module of claim 1, wherein the circuit board further defines at least one positioning groove, the position of the at least one positioning groove corresponds to a position of the at least one connection pad, and the guiding The structure is positioned on the at least one positioning groove to position the circuit board and position the at least one connection pad corresponding to the position of the guiding structure. The battery module of claim 1, wherein the guiding structure has a first side and a second side, the first side is opposite to the second side, and the second side is facing the first side The inner side of the second fixed case, the first side faces the outer side of the second fixed case, and the pin extends from the first side of the guiding structure in a direction away from the bottom plate Then, a top end of the guiding structure extends along the second side of the guiding structure toward the bottom plate, and a free end of the pin is located on the at least one connecting pad. The battery module of claim 3, wherein the free end of the pin of the at least one electrode sheet further defines a uniform perforation, and the free end of the pin is soldered to the solder by a solder The at least one connection pad. The battery module of claim 1, wherein the pin of the at least one electrode sheet further comprises a buffer portion located between the free end of the pin and the body portion. The battery module of claim 5, wherein the buffer portion protrudes from at least one side of the pin. The battery module according to claim 6, wherein the buffer portion is formed in an arc shape, a V shape or a U shape. The battery module of claim 1, wherein at least one of the side walls further defines at least one window, and the position of the at least one window corresponds to a position of the guiding structure. The battery module of claim 1, wherein the second fixing case further comprises an outer side wall, the outer side wall is located outside a first side wall of the side walls, and the first side wall and the first side wall A long groove is formed between the outer side walls. The battery module of claim 9, wherein a second side wall of the side walls further defines an opening located at a bottom end of the elongated groove along a longitudinal direction thereof .