JP6575412B2 - Assembled battery - Google Patents

Description

  The present invention relates to an assembled battery configured by connecting a plurality of batteries in parallel.

  Conventionally, as an assembled battery configured by connecting a plurality of batteries in parallel, for example, there is an assembled battery disclosed in Patent Document 1 shown below.

  This assembled battery is composed of a plurality of unit batteries. Here, the unit battery corresponds to a battery. The unit battery includes a rectangular plate-shaped main body, and a positive terminal and a negative terminal from which one end surface of the main body protrudes. The unit cells are arranged in a row adjacent to each other in the thickness direction of the main body. The plurality of unit batteries are connected in parallel. Specifically, the positive terminals of the plurality of unit cells are connected to each other via a conductive material and are also connected to the positive electrode lead terminal. The negative terminals of the plurality of unit cells are connected to each other through a conductive material and are connected to the negative electrode lead terminals.

Japanese Patent Laid-Open No. 10-188942

  When it is desired to increase the output voltage in the above-described assembled battery, a plurality of battery groups configured by connecting a plurality of unit cells in parallel are provided, and these are arranged in a row adjacent to the plate thickness direction of the main body of the unit cell. In series connection.

  By the way, when a current flows through the unit battery, the unit battery generates heat. The unit cells arranged at both ends of the row have considerably better heat dissipation than other unit cells. For this reason, the unit cells arranged at both ends of the row are considerably suppressed in temperature rise compared to other unit cells. Accordingly, a large temperature difference is generated between the unit cells arranged at both ends of the row and the other unit cells.

  When the battery group is configured by connecting two unit batteries in parallel, the unit batteries constituting the battery group are usually arranged adjacent to each other. When one unit cell of the battery group is arranged at the end of the row, a temperature difference is generated between one unit cell and the other unit cell. For this reason, a difference occurs between the internal resistance of one unit cell and the internal resistance of the other unit cell, so that current concentrates on the unit cell having a low internal resistance. As a result, the unit battery in which the current flows is concentrated quickly. Thereby, the lifetime of a battery group will become short. That is, the life of the assembled battery is shortened.

  This invention is made | formed in view of such a situation, and it aims at providing the assembled battery which can suppress the fall of the lifetime which arises by the temperature difference between batteries.

  The invention made to achieve the above object has a plurality of battery groups configured by connecting two batteries in parallel, and the assembled battery configured by connecting a plurality of battery groups in series. Arranged in a row adjacent to the direction, one battery group of the plurality of battery groups has two batteries arranged at both ends of the row.

  According to this structure, two batteries are arrange | positioned at the both ends of the row | line | column with good heat dissipation in one battery group among several battery groups. Therefore, a temperature difference between one battery and the other battery can be suppressed as compared with the case where one battery is disposed at the end of the row and the other battery is disposed adjacent to the one battery. Therefore, the internal resistance of one battery and the internal resistance of the other battery can be made substantially the same. As a result, it is possible to suppress a situation in which current concentrates on one of the batteries and the battery deteriorates quickly. Thereby, the fall of the lifetime of an assembled battery can be suppressed.

It is a top view of the assembled battery for demonstrating the connection state of the lithium ion battery in 1st Embodiment. It is a perspective view of the lithium ion battery in FIG. It is an equivalent circuit diagram of the battery group which consists of a lithium ion battery arrange | positioned at the both ends in the case of a connection state different from 1st Embodiment. It is an equivalent circuit diagram of the battery group which consists of a lithium ion battery arrange | positioned at both ends in 1st Embodiment. It is a top view for demonstrating the connection state of the assembled battery in the modification of 1st Embodiment. It is a top view of the assembled battery for demonstrating the connection state of the lithium ion battery in 2nd Embodiment. It is a top view of the assembled battery for demonstrating the connection state of the lithium ion battery in the modification of 2nd Embodiment. It is a top view of the assembled battery for demonstrating the connection state of the lithium ion battery in 3rd Embodiment. It is a top view of the assembled battery for demonstrating the connection state of the lithium ion battery in the modification of 3rd Embodiment.

  Next, an embodiment is given and this invention is demonstrated in detail. In this embodiment, the example which applied the assembled battery which concerns on this invention to the assembled battery mounted in a vehicle is shown.

(First embodiment)
First, the configuration of the assembled battery according to the first embodiment will be described with reference to FIGS. 1 and 2. In addition, the front-back direction and the left-right direction in the drawing are described for convenience in order to distinguish the directions.

  A battery pack 1 shown in FIG. 1 is a chargeable / dischargeable secondary battery that supplies power to a load such as a motor mounted on a vehicle. The assembled battery 1 includes battery groups 10 and 11, a serial connection wiring member 160, an assembled battery positive electrode end constituting member 17, an assembled battery negative electrode end constituting member 18, and end plates 190 and 191.

  The battery groups 10 and 11 are battery assemblies configured by connecting two lithium ion batteries described later in parallel. The battery group 10 includes lithium ion batteries 100 and 101 and parallel connection wiring members 102 and 103. The battery group 11 includes lithium ion batteries 110 and 111 and parallel connection wiring members 112 and 113.

  The lithium ion battery 100 is a chargeable / dischargeable secondary battery. As shown in FIG. 2, the lithium ion battery 100 includes a rectangular plate-shaped main body portion 100a, a positive electrode end 100b protruding from one end surface of the main body portion 100a, and a negative electrode end 100c protruding from the other end surface of the main body portion 100a. I have. The lithium ion batteries 101, 110, and 111 are the same secondary batteries as the lithium ion battery 100 and have the same configuration as the lithium ion battery 100.

  As shown in FIG. 1, the lithium ion batteries 100, 101, 110, and 111 are arranged in a predetermined direction so that the main body portions come into contact with the main body portions 100 a, 101 a, 110 a, and 111 a in the front-back direction. They are arranged in rows adjacent to each other in the front-rear direction.

  The lithium ion batteries 100 and 101 of the battery group 10 are arranged at both ends of the row. The lithium ion battery 100 is arranged in the first row from the front row, and the lithium ion battery 101 is arranged in the fourth row from the front row. The lithium ion batteries 100 and 101 are arranged such that the positive electrode ends 100b and 101b are on the right side and the negative electrode ends 100c and 101c are on the left side.

  The lithium ion batteries 110 and 111 of the battery group 11 are arranged between the lithium ion batteries 100 and 101 of the battery group 10. Lithium ion batteries 110 are arranged in the second row from the front, and lithium ion batteries 111 are arranged in the third row from the front. The lithium ion batteries 110 and 111 are arranged such that the positive electrode ends 110b and 111b are on the left side and the negative electrode ends 110c and 111c are on the right side.

  The parallel connection wiring members 102 and 103 are wiring members for connecting the lithium ion batteries 100 and 101 of the battery group 10 in parallel. Specifically, the parallel connection wiring member 102 is a plate-like member made of metal that connects the positive electrode ends 100 b and 101 b of the lithium ion batteries 100 and 101. The parallel connection wiring member 103 is a plate-like member made of a metal that connects the negative electrode ends 100 c and 101 c of the lithium ion batteries 100 and 101. The shapes and dimensions of the parallel connection wiring members 102 and 103 are set so that the resistances R102 and R103 are equal. One end of the parallel connection wiring member 102 is connected to the positive electrode end 100 b of the lithium ion battery 100, and the other end is connected to the positive electrode end 101 b of the lithium ion battery 101. One end of the parallel connection wiring member 103 is connected to the negative electrode end 100 c of the lithium ion battery 100, and the other end is connected to the negative electrode end 101 c of the lithium ion battery 101.

  The parallel connection wiring members 112 and 113 are wiring members for connecting the lithium ion batteries 110 and 111 of the battery group 11 in parallel. Specifically, the parallel connection wiring member 112 is a plate-shaped member made of a metal that connects the positive electrode ends 110 b and 111 b of the lithium ion batteries 110 and 111. The parallel connection wiring member 113 is a plate-like member made of a metal that connects the negative electrode ends 110 c and 111 c of the lithium ion batteries 110 and 111. One end of the parallel connection wiring member 112 is connected to the positive end 110 b of the lithium ion battery 110, and the other end is connected to the positive end 111 b of the lithium ion battery 111. One end of the parallel connection wiring member 113 is connected to the negative electrode end 110 c of the lithium ion battery 110, and the other end is connected to the negative electrode end 111 c of the lithium ion battery 111.

  The serial connection wiring member 160 is a wiring member for connecting the battery groups 10 and 11 in series. Specifically, the positive electrode end 100 b of the lithium ion battery 100 of the battery group 10 is a plate-like member made of metal that connects the parallel connection wiring member 113 of the battery group 11. One end of the serial connection wiring member 160 is connected to the positive electrode end 100 b of the lithium ion battery 100, and the other end is connected to the parallel connection wiring member 113.

  The assembled battery positive electrode end constituting member 17 is a member for constituting the positive electrode end of the assembled battery 1. Specifically, it is a plate-like member made of metal that is connected to the positive electrode end of the battery group 11 and constitutes the positive electrode end of the assembled battery 1. One end of the assembled battery positive electrode end constituting member 17 is connected to the positive electrode end 111 b of the lithium ion battery 111 of the battery group 11.

  The assembled battery negative electrode end constituting member 18 is a member for constituting the negative electrode end of the assembled battery 1. Specifically, it is a plate-like member made of a metal connected to the negative electrode end of the battery group 10 and constituting the negative electrode end of the assembled battery 1. One end of the assembled battery negative electrode end constituting member 18 is connected to the negative electrode end 101 c of the lithium ion battery 101 of the battery group 10.

  The end plates 190 and 191 are rectangular plate members made of metal that sandwich and hold the lithium ion batteries 100, 101, 110, and 111 arranged in a row adjacent to each other in the front-rear direction. The end plate 190 is arranged on the front side of the lithium ion batteries 100, 101, 110, and 111 arranged in a row, adjacent to the main body 100 a of the lithium ion battery 100. The end plate 191 is arranged on the rear side of the lithium ion batteries 100, 101, 110, 111 arranged in a row, adjacent to the main body 101 a of the lithium ion battery 101. The end plates 190 and 191 are fixed by bolts or the like not shown in a state where the lithium ion batteries 100, 101, 110, and 111 arranged in a row are sandwiched from the front side and the rear side.

  Next, the effect of the assembled battery of 1st Embodiment is demonstrated.

  According to the first embodiment, the assembled battery 1 includes the battery groups 10 and 11. The battery group 10 is configured by connecting two lithium ion batteries 100 and 101 in parallel. The battery group 11 is configured by connecting two lithium ion batteries 110 and 111 in parallel. The battery groups 10 and 11 are connected in series. The lithium ion batteries 100, 101, 110, and 111 are arranged in a row adjacent to each other in the front-rear direction. In the battery group 10, two lithium ion batteries 100 and 101 are arranged at both ends of a row with good heat dissipation. Therefore, a temperature difference between the lithium ion battery 100 and the lithium ion battery 101 is suppressed as compared with the case where one lithium ion battery is disposed at the end of the row and the other lithium ion battery is disposed adjacent to the one lithium ion battery. be able to. Therefore, the internal resistance of the lithium ion battery 100 and the internal resistance of the lithium ion battery 101 can be made substantially the same. As a result, it is possible to suppress a situation in which current concentrates on one of the lithium ion batteries and the lithium ion battery deteriorates quickly. Thereby, the fall of the lifetime of the assembled battery 1 can be suppressed.

  When the positive electrode end 101b of the lithium ion battery 101 is connected to the battery group 11 via the serial connection wiring member 160, as shown in FIG. While flowing through a path composed of the member 103, the lithium ion battery 100 and the parallel connection wiring member 102, flows along a path composed of the lithium ion battery 101 and flows into the series connection wiring member 160. As described above, the internal resistances r100 and r101 of the lithium ion batteries 100 and 101 are substantially the same. Therefore, the path composed of the parallel connection wiring member 103, the lithium ion battery 100, and the parallel connection wiring member 102 is more resistant than the path composed of the lithium ion battery 101 by the resistances R102 and R103 of the parallel connection wiring members 102 and 103. Becomes larger. Therefore, the current flowing through the lithium ion battery 101 is larger than the current flowing through the lithium ion battery 100. As a result, the lithium ion battery 101 deteriorates faster than the lithium ion battery 100.

  However, according to the first embodiment, the battery group 10 includes the negative electrode end 101c of the lithium ion battery 101 connected to the assembled battery negative electrode end constituting member 18 to form the negative electrode end of the assembled battery 1, and the lithium ion battery 100. The positive electrode end 100 b is connected to the other battery group 11 via the serial connection wiring member 160. Therefore, as shown in FIG. 4, the current flowing from the assembled battery negative electrode end constituting member 18 flows through a path including the parallel connection wiring member 103 and the lithium ion battery 100, and from the lithium ion battery 101 and the parallel connection wiring member 102. And flows into the serial connection wiring member 160. Therefore, it is possible to suppress a situation in which current is concentrated on any lithium ion battery due to resistance imbalance. As a result, it is possible to reliably suppress a decrease in the life of the assembled battery 1.

  According to the first embodiment, the parallel connection wiring member 102 connecting the positive electrode ends 100b, 101b of the two lithium ion batteries 100, 101 arranged at both ends of the row and the parallel connection wiring member connecting the negative electrode ends 100c, 101c. The shape and size of the resistor 103 are set so that the resistors R102 and R103 are equal. Therefore, it is possible to reliably suppress a situation in which current is concentrated on any lithium ion battery due to resistance imbalance.

  According to the first embodiment, the assembled battery 1 includes end plates 190 and 191. The end plates 190 and 191 are members that sandwich and hold the lithium ion batteries 100, 101, 110, and 111 arranged in a row adjacent to each other in the front-rear direction. Therefore, the lithium ion batteries 100, 101, 110, and 111 can be reliably held in an adjacent state. Further, the heat generated by the lithium ion batteries 100 and 101 can be reliably radiated through the end plates 190 and 191.

  In the first embodiment, the negative electrode end 101c of the lithium ion battery 101 is connected to the assembled battery negative electrode end constituting member 18 to form the negative electrode end of the assembled battery 1, and the positive electrode end 100b of the lithium ion battery 100 is connected in series. Although the example connected to the other battery group 11 through the member 160 is given, it is not limited to this. As shown in FIG. 5, the positive electrode end 100b of the lithium ion battery 100 is connected to the assembled battery positive electrode end component member 17 to form the positive electrode end of the assembled battery 1, and the negative electrode end 101c of the lithium ion battery 101 is connected in series. It may be connected to another battery group 11 via 160. In this case as well, it is possible to suppress a situation in which current concentrates on any lithium ion battery due to resistance imbalance.

(Second Embodiment)
Next, the assembled battery of 2nd Embodiment is demonstrated. The assembled battery according to the second embodiment is configured by connecting six battery groups in series, whereas the assembled battery according to the first embodiment is configured by connecting two battery groups in series. It is.

  First, the structure of the assembled battery of 2nd Embodiment is demonstrated with reference to FIG. In addition, the front-back direction and the left-right direction in the drawing are described for convenience in order to distinguish the directions.

  As shown in FIG. 6, the assembled battery 2 includes battery groups 20 to 25, series connection wiring members 260 to 264, an assembled battery positive electrode end component member 27, an assembled battery negative electrode end component member 28, an end plate 290, 291.

  The battery groups 20 to 25 are battery assemblies configured by connecting two lithium ion batteries in parallel. The battery group 20 includes lithium ion batteries 200 and 201 and parallel connection wiring members 202 and 203. The battery group 21 includes lithium ion batteries 210 and 211 and parallel connection wiring members 212 and 213. The battery group 22 includes lithium ion batteries 220 and 221 and parallel connection wiring members 222 and 223. The battery group 23 includes lithium ion batteries 230 and 231 and parallel connection wiring members 232 and 233. The battery group 24 includes lithium ion batteries 240 and 241 and parallel connection wiring members 242 and 243. The battery group 25 includes lithium ion batteries 250 and 251 and parallel connection wiring members 252 and 253.

  The lithium ion batteries 200, 201, 210, 211, 220, 221, 230, 231, 240, 241, 250, and 251 are the same secondary batteries as the lithium ion battery 100 of the first embodiment.

  Lithium ion batteries 200, 201, 210, 211, 220, 221, 230, 231, 240, 241, 250, 251 have main body portions 200a, 201a, 210a, 211a, 220a, 221a, 230a, 231a, 240a, 241a, In a state where the plate thickness direction of 250a, 251a is the front-rear direction, the main body portions are arranged in rows adjacent to the front-rear direction, which is a predetermined direction, so as to come into contact with each other.

  The lithium ion batteries 200 and 201 in the battery group 20 are arranged at both ends of the row. The lithium ion batteries 200 are arranged in the first row from the front row, and the lithium ion batteries 201 are arranged in the twelfth row from the front row. The lithium ion batteries 200 and 201 are arranged so that the positive electrode ends 200b and 201b are on the right side and the negative electrode ends 200c and 201c are on the left side.

  The lithium ion batteries 210, 211, 220, 221, 230, 231, 240, 241, 250, and 251 of the battery groups 21 to 25 are disposed between the lithium ion batteries 200 and 201 of the battery group 20. The lithium ion batteries 210 are arranged in the second row from the front of the row, and the lithium ion batteries 211 are arranged in the third row from the front of the row. The lithium ion batteries 210 and 211 are arranged so that the positive electrode ends 210b and 211b are on the left side and the negative electrode ends 210c and 211c are on the right side. Lithium ion batteries 220 are arranged in the fourth row from the front, and lithium ion batteries 221 are arranged in the fifth row from the front. The lithium ion batteries 220 and 221 are arranged so that the positive electrode ends 220b and 221b are on the right side and the negative electrode ends 220c and 221c are on the left side. The lithium ion batteries 230 are arranged in the sixth row from the front, and the lithium ion batteries 231 are arranged in the seventh row from the front. The lithium ion batteries 230 and 231 are arranged so that the positive electrode ends 230b and 231b are on the left side and the negative electrode ends 230c and 231c are on the right side. The lithium ion batteries 240 are arranged in the eighth row from the front of the row, and the lithium ion batteries 241 are arranged in the ninth row from the front of the row. The lithium ion batteries 240 and 241 are arranged such that the positive electrode ends 240b and 241b are on the right side and the negative electrode ends 240c and 241c are on the left side. The lithium ion batteries 250 are arranged in the tenth row from the front of the row, and the lithium ion batteries 251 are arranged in the eleventh row from the front of the row. The lithium ion batteries 250 and 251 are arranged so that the positive electrode ends 250b and 251b are on the left side and the negative electrode ends 250c and 251c are on the right side.

  The parallel connection wiring members 202 and 203 are plate-like members made of metal that connect the lithium ion batteries 200 and 201 of the battery group 20 in parallel. The shapes and dimensions of the parallel connection wiring members 202 and 203 are set so that the resistances are equal to each other. One end of the parallel connection wiring member 202 is connected to the positive electrode end 200 b of the lithium ion battery 200, and the other end is connected to the positive electrode end 201 b of the lithium ion battery 201. One end of the parallel connection wiring member 203 is connected to the negative electrode end 200 c of the lithium ion battery 200, and the other end is connected to the negative electrode end 201 c of the lithium ion battery 201.

  The parallel connection wiring members 212 and 213 are plate-like members made of metal that connect the lithium ion batteries 210 and 211 constituting the battery group 21 in parallel. The parallel connection wiring members 222 and 223 are plate-like members made of metal that connect the lithium ion batteries 220 and 221 constituting the battery group 22 in parallel. The parallel connection wiring members 232 and 233 are plate-like members made of metal that connect the lithium ion batteries 230 and 231 constituting the battery group 23 in parallel. The parallel connection wiring members 242 and 243 are plate-like members made of metal that connect the lithium ion batteries 240 and 241 constituting the battery group 24 in parallel. The parallel connection wiring members 252 and 253 are plate-like members made of metal that connect the lithium ion batteries 250 and 251 constituting the battery group 25 in parallel. The parallel connection wiring members 212, 213, 222, 223, 232, 233, 242, 243, 252, and 253 are the same members as the parallel connection wiring members 112 and 113 of the first embodiment.

  One end of the parallel connection wiring member 212 is connected to the positive electrode end 210 b of the lithium ion battery 210, and the other end is connected to the positive electrode end 211 b of the lithium ion battery 211. One end of the parallel connection wiring member 213 is connected to the negative electrode end 210 c of the lithium ion battery 210, and the other end is connected to the negative electrode end 211 c of the lithium ion battery 211. One end of the parallel connection wiring member 222 is connected to the positive end 220 b of the lithium ion battery 220, and the other end is connected to the positive end 221 b of the lithium ion battery 221. One end of the parallel connection wiring member 223 is connected to the negative electrode end 220 c of the lithium ion battery 220, and the other end is connected to the negative electrode end 221 c of the lithium ion battery 221. One end of the parallel connection wiring member 232 is connected to the positive end 230 b of the lithium ion battery 230, and the other end is connected to the positive end 231 b of the lithium ion battery 231. One end of the parallel connection wiring member 233 is connected to the negative electrode end 230 c of the lithium ion battery 230, and the other end is connected to the negative electrode end 231 c of the lithium ion battery 231. One end of the parallel connection wiring member 242 is connected to the positive electrode end 240 b of the lithium ion battery 240, and the other end is connected to the positive electrode end 241 b of the lithium ion battery 241. One end of the parallel connection wiring member 243 is connected to the negative electrode end 240 c of the lithium ion battery 240, and the other end is connected to the negative electrode end 241 c of the lithium ion battery 241. One end of the parallel connection wiring member 252 is connected to the positive electrode end 250b of the lithium ion battery 250, and the other end is connected to the positive electrode end 251b of the lithium ion battery 251. One end of the parallel connection wiring member 253 is connected to the negative electrode end 250 c of the lithium ion battery 250, and the other end is connected to the negative electrode end 251 c of the lithium ion battery 251.

  The serial connection wiring member 260 is a plate-like member made of metal that connects the battery groups 20 and 21 in series. The serial connection wiring member 261 is a plate-like member made of metal that connects the battery groups 21 and 22 in series. The serial connection wiring member 262 is a plate-like member made of metal that connects the battery groups 22 and 23 in series. The series connection wiring member 263 is a plate-like member made of metal that connects the battery groups 23 and 24 in series. The serial connection wiring member 264 is a plate-like member made of metal that connects the battery groups 24 and 25 in series.

  One end of the serial connection wiring member 260 is connected to the positive electrode end 200 b of the lithium ion battery 200, and the other end is connected to the parallel connection wiring member 213. One end of the serial connection wiring member 261 is connected to the parallel connection wiring member 212, and the other end is connected to the parallel connection wiring member 223. One end of the serial connection wiring member 262 is connected to the parallel connection wiring member 222, and the other end is connected to the parallel connection wiring member 233. One end of the serial connection wiring member 263 is connected to the parallel connection wiring member 232, and the other end is connected to the parallel connection wiring member 243. One end of the serial connection wiring member 264 is connected to the parallel connection wiring member 242 and the other end is connected to the parallel connection wiring member 253.

  The assembled battery positive electrode end constituting member 27 is a member for constituting the positive electrode end of the assembled battery 2. One end of the assembled battery positive electrode end constituting member 27 is connected to the positive electrode end 251 b of the lithium ion battery 251 of the battery group 25.

  The assembled battery negative electrode end constituting member 28 is a member for constituting the negative electrode end of the assembled battery 2. One end of the assembled battery negative electrode end constituting member 28 is connected to the negative electrode end 201 c of the lithium ion battery 201 of the battery group 20.

  End plates 290 and 291 hold and hold lithium ion batteries 210, 211, 220, 221, 230, 231, 240, 241, 250, and 251 arranged in a row adjacent to each other in the front-rear direction from the front side and the rear side. It is a rectangular plate-shaped member made of metal. The end plate 290 is in front of the lithium ion batteries 210, 211, 220, 221, 230, 231, 240, 241, 250, 251 arranged in a row and adjacent to the main body 200 a of the lithium ion battery 200. Has been placed. The end plate 291 is adjacent to the main body 201a of the lithium ion battery 201 on the rear side of the lithium ion batteries 210, 211, 220, 221, 230, 231, 240, 241, 250, 251 arranged in a row. Is arranged in. End plates 290 and 291 are bolts not shown in a state where lithium ion batteries 210, 211, 220, 221, 230, 231, 240, 241, 250, and 251 arranged in a row are sandwiched from the front side and the rear side It is fixed by etc.

  Next, the effect of the assembled battery according to the second embodiment will be described.

  According to the second embodiment, by having the same configuration as that of the first embodiment, the same effect as that of the first embodiment corresponding to the same configuration can be obtained.

  In the second embodiment, the negative electrode end 201c of the lithium ion battery 201 is connected to the assembled battery negative electrode end constituting member 28 to form the negative electrode end of the assembled battery 2, and the positive electrode end 200b of the lithium ion battery 200 is connected in series. Although the example connected to the other battery group 21 through the member 260 is given, it is not limited to this. As shown in FIG. 7, the positive electrode end 200b of the lithium ion battery 200 is connected to the assembled battery positive electrode end constituting member 27 to form the positive electrode end of the assembled battery 2, and the negative electrode end 201c of the lithium ion battery 201 is connected in series. It may be connected to another battery group 25 via 260. In this case as well, it is possible to suppress a situation in which current concentrates on any lithium ion battery due to resistance imbalance.

(Third embodiment)
Next, the assembled battery of 3rd Embodiment is demonstrated. The assembled battery of 3rd Embodiment changes the arrangement | positioning method of a lithium ion battery with respect to the assembled battery of 2nd Embodiment.

  First, the structure of the assembled battery of 3rd Embodiment is demonstrated with reference to FIG. In addition, the front-back direction and the left-right direction in the drawing are described for convenience in order to distinguish the directions.

  As shown in FIG. 8, the assembled battery 3 includes battery groups 30 to 35, series connection wiring members 360 to 364, an assembled battery positive electrode end constituting member 37, an assembled battery negative electrode end constituting member 38, an end plate 390, 391.

  The battery groups 30 to 35 are battery assemblies configured by connecting two lithium ion batteries in parallel. The battery group 30 includes lithium ion batteries 300 and 301 and parallel connection wiring members 302 and 303. The battery group 31 includes lithium ion batteries 310 and 311 and parallel connection wiring members 312 and 313. The battery group 32 includes lithium ion batteries 320 and 321 and parallel connection wiring members 322 and 323. The battery group 33 includes lithium ion batteries 330 and 331 and parallel connection wiring members 332 and 333. The battery group 34 includes lithium ion batteries 340 and 341 and parallel connection wiring members 342 and 343. The battery group 35 includes lithium ion batteries 350 and 351 and parallel connection wiring members 352 and 353.

  The lithium ion batteries 300, 301, 310, 311, 320, 321, 330, 331, 340, 341, 350, 351 are the lithium ion batteries 200, 201, 210, 211, 220, 221, 230 of the second embodiment. It is the same secondary battery as 231, 240, 241, 250, and 251.

  Lithium ion batteries 300, 301, 310, 311, 320, 321, 330, 331, 340, 341, 350, 351 include main bodies 300a, 301a, 310a, 311a, 320a, 321a, 330a, 331a, 340a, 341a, In a state where the plate thickness direction of 350a, 351a is the front-rear direction, they are arranged in a row adjacent to the front-rear direction, which is a predetermined direction, so that the main body part comes into contact.

  The lithium ion batteries 300 and 301 of the battery group 30 are arranged at both ends of the row. The lithium ion batteries 300 are arranged in the first row from the front row, and the lithium ion batteries 301 are arranged in the first row from the rear row. The lithium ion batteries 300 and 301 are arranged such that the positive electrode ends 300b and 301b are on the right side and the negative electrode ends 300c and 301c are on the left side.

  The battery groups 31 to 35 include an arrangement order of one lithium ion battery counted from one end of the row between the lithium ion batteries 300 and 301 of the battery group 30, and the other lithium ion counted from the other end of the row. The batteries are arranged in the same order.

  The lithium ion batteries 310 are arranged in the second row from the front, and the lithium ion batteries 311 are arranged in the second row from the rear. The lithium ion batteries 310 and 311 are arranged so that the positive electrode ends 310b and 311b are on the left side and the negative electrode ends 310c and 311c are on the right side. Lithium ion batteries 320 are arranged in the third row from the front, and lithium ion batteries 321 are arranged in the third row from the rear. The lithium ion batteries 320 and 321 are arranged such that the positive electrode ends 320b and 321b are on the right side and the negative electrode ends 320c and 321c are on the left side. Lithium ion batteries 330 are arranged in the fourth row from the front, and lithium ion batteries 331 are arranged in the fourth row from the rear. The lithium ion batteries 330 and 331 are arranged so that the positive electrode ends 330b and 331b are on the left side and the negative electrode ends 330c and 331c are on the right side. Lithium ion batteries 340 are arranged in the fifth row from the front, and lithium ion batteries 341 are arranged in the fifth row from the rear. The lithium ion batteries 340 and 341 are arranged such that the positive electrode ends 340b and 341b are on the right side and the negative electrode ends 340c and 341c are on the left side. The lithium ion batteries 350 are arranged in the sixth row from the front, and the lithium ion batteries 351 are arranged in the sixth row from the rear. The lithium ion batteries 350 and 351 are arranged so that the positive electrode ends 350b and 351b are on the left side and the negative electrode ends 350c and 351c are on the right side.

  The parallel connection wiring members 302 and 303 are plate-like members made of metal that connect the lithium ion batteries 300 and 301 of the battery group 30 in parallel. The shapes and dimensions of the parallel connection wiring members 302 and 303 are set so that the resistances are equal to each other. One end of the parallel connection wiring member 302 is connected to the positive electrode end 300 b of the lithium ion battery 300, and the other end is connected to the positive electrode end 301 b of the lithium ion battery 301. One end of the parallel connection wiring member 303 is connected to the negative electrode end 300 c of the lithium ion battery 300, and the other end is connected to the negative electrode end 301 c of the lithium ion battery 301.

  The parallel connection wiring members 312 and 313 are plate-shaped members made of metal that connect the lithium ion batteries 310 and 311 of the battery group 31 in parallel. The parallel connection wiring members 322 and 323 are plate-like members made of metal that connect the lithium ion batteries 320 and 321 of the battery group 32 in parallel. The parallel connection wiring members 332 and 333 are plate-shaped members made of metal that connect the lithium ion batteries 330 and 331 of the battery group 33 in parallel. The parallel connection wiring members 342 and 343 are plate-like members made of metal that connect the lithium ion batteries 340 and 341 of the battery group 34 in parallel. The parallel connection wiring members 352 and 353 are plate-like members made of metal that connect the lithium ion batteries 350 and 351 of the battery group 35 in parallel.

  One end of the parallel connection wiring member 312 is connected to the positive end 310 b of the lithium ion battery 310, and the other end is connected to the positive end 311 b of the lithium ion battery 311. One end of the parallel connection wiring member 313 is connected to the negative electrode end 310 c of the lithium ion battery 310, and the other end is connected to the negative electrode end 311 c of the lithium ion battery 311. One end of the parallel connection wiring member 322 is connected to the positive end 320 b of the lithium ion battery 320, and the other end is connected to the positive end 321 b of the lithium ion battery 321. One end of the parallel connection wiring member 323 is connected to the negative electrode end 320 c of the lithium ion battery 320, and the other end is connected to the negative electrode end 321 c of the lithium ion battery 321. One end of the parallel connection wiring member 332 is connected to the positive end 330 b of the lithium ion battery 330, and the other end is connected to the positive end 331 b of the lithium ion battery 331. One end of the parallel connection wiring member 333 is connected to the negative electrode end 330 c of the lithium ion battery 330, and the other end is connected to the negative electrode end 331 c of the lithium ion battery 331. One end of the parallel connection wiring member 342 is connected to the positive end 340b of the lithium ion battery 340, and the other end is connected to the positive end 341b of the lithium ion battery 341. One end of the parallel connection wiring member 343 is connected to the negative electrode end 340 c of the lithium ion battery 340, and the other end is connected to the negative electrode end 341 c of the lithium ion battery 341. One end of the parallel connection wiring member 352 is connected to the positive end 350b of the lithium ion battery 350, and the other end is connected to the positive end 351b of the lithium ion battery 351. One end of the parallel connection wiring member 353 is connected to the negative electrode end 350 c of the lithium ion battery 350, and the other end is connected to the negative electrode end 351 c of the lithium ion battery 351.

  The serial connection wiring member 360 is a plate-shaped member made of metal that connects the battery groups 30 and 31 in series. The serial connection wiring member 361 is a plate-like member made of metal that connects the battery groups 31 and 32 in series. The serial connection wiring member 362 is a plate-shaped member made of metal that connects the battery groups 32 and 33 in series. The serial connection wiring member 363 is a plate-like member made of metal that connects the battery groups 33 and 34 in series. The serial connection wiring member 364 is a plate-like member made of metal that connects the battery groups 34 and 35 in series.

  One end of the series connection wiring member 360 is connected to the positive electrode end 300 b of the lithium ion battery 300, and the other end is connected to the parallel connection wiring member 313. One end of the serial connection wiring member 361 is connected to the positive electrode end 311 b of the lithium ion battery 311, and the other end is connected to the parallel connection wiring member 323. One end of the serial connection wiring member 362 is connected to the positive electrode end 320 b of the lithium ion battery 320, and the other end is connected to the parallel connection wiring member 333. One end of the series connection wiring member 363 is connected to the positive electrode end 331 b of the lithium ion battery 331, and the other end is connected to the parallel connection wiring member 343. One end of the serial connection wiring member 364 is connected to the positive electrode end 340 b of the lithium ion battery 340, and the other end is connected to the parallel connection wiring member 353.

  The assembled battery positive electrode end constituting member 37 is a member for constituting the positive electrode end of the assembled battery 3. One end of the assembled battery positive electrode end constituting member 37 is connected to the positive electrode end 351 b of the lithium ion battery 351 of the battery group 35.

  The assembled battery negative electrode end constituting member 38 is a member for constituting the negative electrode end of the assembled battery 3. One end of the assembled battery negative electrode end constituting member 38 is connected to the negative electrode end 301 c of the lithium ion battery 301 of the battery group 30.

  The end plates 390 and 391 are the same members as the end plates 290 and 291 of the second embodiment. The end plates 390 and 391 are arranged in the same manner as the end plates 290 and 291 of the second embodiment, and are fixed by bolts not shown.

  Next, the effect of the assembled battery according to the third embodiment will be described.

  According to the third embodiment, by having the same configuration as that of the second embodiment, the same effect as that of the second embodiment corresponding to the same configuration can be obtained.

  The lithium ion batteries 300, 301, 310, 311, 320, 321, 330, 331, 340, 341, 350, and 351 have the lowest temperature of the lithium ion batteries 300 and 301 arranged at both ends of the row. Then, the temperature of the lithium ion battery gradually increases toward the center of the row, and the temperature of the lithium ion batteries 350 and 351 disposed in the center is highest. A lithium ion battery in which the arrangement order counted from one end of the row and the arrangement order counted from the other end of the row are the same has substantially the same temperature. According to the third embodiment, the other battery groups 31 to 35 excluding the battery group 30 are the arrangement order of one lithium ion battery counted from one end of the row and the other counted from the other end of the row. The lithium ion batteries are arranged in the same arrangement order. Therefore, also in the battery groups 31 to 35, the temperature difference between one lithium ion battery and the other lithium ion battery can be suppressed. Therefore, also in the battery groups 31 to 35, the internal resistance of one lithium ion battery and the internal resistance of the other lithium ion battery can be made substantially the same. As a result, even in the battery groups 31 to 35, it is possible to suppress a situation in which current concentrates on one of the batteries and the battery deteriorates quickly. Thereby, the fall of the lifetime of the assembled battery 3 can be suppressed more reliably.

  In the third embodiment, the negative electrode end 301c of the lithium ion battery 301 is connected to the assembled battery negative electrode end constituting member 38 to form the negative electrode end of the assembled battery 3, and the positive electrode end 300b of the lithium ion battery 300 is connected in series. Although the example connected to the other battery group 31 through the member 360 is given, it is not limited to this. As shown in FIG. 9, the positive electrode end 300b of the lithium ion battery 300 is connected to the assembled battery positive electrode end constituting member 37 to form the positive electrode end of the assembled battery 3, and the negative electrode end 301c of the lithium ion battery 301 is connected in series. 360 may be connected to another battery group 35 via 360. In this case as well, it is possible to suppress a situation in which current concentrates on any lithium ion battery due to resistance imbalance.

  In the first embodiment, the assembled battery has two battery groups. In the second and third embodiments, the assembled battery has six battery groups. However, the present invention is not limited to this. Absent. The assembled battery may have a plurality of battery groups.

  In 1st-3rd embodiment, although the assembled battery has mentioned the example provided with the end plate, it is not restricted to this. The end plate may not be provided.

  In 1st-3rd embodiment, although the lithium ion battery has given the example which is plate shape, it is not restricted to this. The lithium ion battery may have any shape. What is necessary is just to be arrange | positioned adjacently.

  In 1st-3rd embodiment, although the example in which the serial connection wiring member is a plate-shaped member which consists of metals is given, it is not restricted to this. The serial connection wiring member may be a member having conductivity.

  According to the first to third embodiments, an example in which the assembled battery positive electrode end constituting member and the assembled battery negative electrode end constituting member are plate-like members made of metal is given, but the present invention is not limited thereto. The assembled battery positive electrode end constituent member and the assembled battery negative electrode end constituent member may be members having conductivity.

  In the first to third embodiments, an example in which a plurality of lithium ion batteries are arranged in a row in the front-rear direction and a plurality of lithium ion batteries in which end plates are arranged in a row is sandwiched and held from the front side and the rear side. It is mentioned, but not limited to this. Prepare multiple sets of multiple lithium-ion batteries arranged in rows in the front-rear direction, arrange them in a direction perpendicular to the row direction, and hold them all together from the front and rear sides with a set of end plates You may make it do.

  DESCRIPTION OF SYMBOLS 1 ... assembled battery 10, 11 ... battery group, 100, 101, 110, 111 ... lithium ion battery, 100b, 101b, 110b, 111b ... positive electrode end, 100c, 101c, 110c, 111c ... Negative electrode end, 102, 103, 112, 113 ... Parallel connection wiring member, 160 ... Series connection wiring member, 17 ... Assembly battery positive electrode end component, 18 ... Assembly battery negative electrode end configuration Member, 190, 191 ... End plate

Claims (5)

In a battery pack having a plurality of battery groups configured by connecting two batteries in parallel, and configured by connecting a plurality of the battery groups in series,
The battery (100, 101, 110, 111, 200, 201, 210, 211, 220, 221, 230, 231, 240, 241, 250, 251, 300, 301, 310, 311, 320, 321, 330, 331 340, 341, 350, 351) are arranged in a row adjacent to each other in a predetermined direction,
One battery group (10, 20, 30) of the plurality of battery groups is an assembled battery in which two batteries are arranged at both ends of a row.   The other battery groups (31 to 35) excluding the battery group in which the two batteries are arranged at both ends of the row include the arrangement order of the one battery counted from one end of the row and the other of the row. The assembled battery according to claim 1, wherein the other batteries counted from the end of the battery are arranged in the same order.   The battery group in which two batteries are arranged at both ends of a row, the positive end of one battery forms the positive end of a battery pack, and the negative end of the other battery is connected to the other battery group, Alternatively, the assembled battery according to claim 1, wherein a negative electrode end of one of the batteries forms a negative electrode end of the assembled battery, and a positive electrode end of the other battery is connected to the other battery group.   The wiring (102, 202, 302) connecting the positive electrode ends of the two batteries arranged at both ends of the row and the wiring (103, 203, 303) connecting the negative electrode ends have the same resistance. Assembled battery.   The group according to any one of claims 1 to 4, further comprising an end plate (190, 191, 290, 291, 390, 391) that sandwiches and holds the batteries arranged in rows adjacent to each other in a predetermined direction. battery.

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