JP2012134016A - Voltage detection terminal, plate with terminal, and battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a voltage detection terminal capable of suppressing slide abrasion of a contact part and ensuring an ultrasonic-welding property, and to provide a plate with terminal to which the terminal is assembled, and a battery module having the plate.SOLUTION: A terminal 140 has: a tab junction 142 to which a tab of a thin battery 200 is joined by ultrasonic-welding; a contact part 141 to be a connection part with a connector 300 to which a voltage detection wire harness is connected; and a spring part 143 coupling between the tab junction part 142 and the contact part 141. In plates 110 and 120 attached to an end part of the battery 200, the contact part 141 of the terminal 140 is fixed to the plates 110 and 120. The spring part 143 and the tab junction 142 are not fixed to the plates 110 and 120. The battery module 10 has at least one plate to which the terminal 140 is assembled. The tab of the battery 200 and the tab junction 142 of the terminal 140 are joined.

Description

  The present invention relates to a voltage detection terminal, a plate with a terminal, and a battery module.

  Conventionally, high-power batteries are mounted on electric vehicles that use a motor as a drive source, hybrid cars that use a motor and an engine as drive sources, and the like. As such a high output type battery, for example, a flat thin secondary battery is used as a single battery. A plurality of the unit cells are stacked and the unit cells are electrically connected in series or in parallel to constitute a high capacity battery module. Further, a plurality of battery modules are combined and electrically connected to be mounted on a vehicle as a single assembled battery.

  For example, a laminated battery in which a power generation element in which a separator is interposed between a flat positive electrode plate and a negative electrode plate is sealed with an exterior material such as a laminate film is used as a thin unit cell for automobiles. Such a laminated battery is configured by thermally welding the peripheral edge to seal the power generating element and the electrolyte, and pulling out a tab electrically connected to the positive electrode plate and the negative electrode plate from the end.

  In a battery module in which a plurality of laminated batteries are stacked, the voltage or the like of each laminated battery changes according to a change in the running state of the automobile. Accurately grasping the voltage of each laminated battery and constantly monitoring the charge / discharge state of each laminated battery is important for improving reliability and safety. Therefore, each laminated battery is provided with a voltage detection terminal for measuring the voltage.

  For example, in Patent Document 1, in a battery module, in order to detect a voltage for each laminated battery, instead of connecting a voltage detection wire harness to each tab of each laminated battery, a voltage detecting terminal is previously connected to each laminated battery. A technique for connecting a connector to which a voltage detection wire harness is connected to a voltage detection terminal after laminating and laminating a laminated battery provided with the voltage detection terminal is disclosed.

  Further, this document describes that the voltage detection terminal is composed of a blade-shaped contact portion and a square plate portion connected to the blade-shaped contact portion, and the tab of the laminated battery is superposed on the flat plate portion of the voltage detection terminal. The point of joining by sonic welding, the point of holding the voltage detection terminal so as to move to some extent on the plate-like frame on which the laminated battery is placed are described.

JP 2006-32224 A

  However, the prior art has problems in the following points. That is, as described in Patent Document 1, when the voltage detection terminal is movably mounted, it slides on the terminal connection portion due to vibration or the like after being connected to the terminal on the connector side of the voltage detection wire harness. Wear occurs. If it becomes so, the resistance of a terminal connection part will become high and electrical connection reliability will fall. As a result, it becomes difficult to grasp the accurate voltage of the laminated battery.

  In order to solve this problem, it is conceivable to completely fix the contact portion of the voltage detection terminal connected to the connector side terminal of the voltage detection wire harness to a plate-like frame or the like. However, when the contact portion of the voltage detection terminal is fixed, the flat plate portion connected to the contact portion is also fixed at the same time. As a result, it becomes difficult to ultrasonically weld the tab of the laminated battery to the flat plate portion of the voltage detection terminal. Thus, in the conventional voltage detection terminal, it has been difficult to achieve both sliding wear of the contact portion and ultrasonic weldability.

  The present invention has been made in view of the above circumstances, and the problem to be solved by the present invention is a voltage capable of suppressing sliding wear of the contact portion and ensuring ultrasonic weldability. It is to provide a detection terminal. Another object of the present invention is to provide a plate with a terminal to which the voltage detection terminal is assembled, and a battery module having the plate.

  In order to solve the above-described problems, a voltage detection terminal according to the present invention includes a thin plate-shaped battery body in which a power generation element is sealed with an exterior material, and an electrode connected to the electrode of the power generation element. A tab used for voltage detection of a thin battery having a tab led to the tab, a tab joint where the tab of the thin battery is joined by ultrasonic welding, and a connector to which a wire harness for voltage detection is connected The gist of the present invention is to have a contact portion serving as a connecting portion, and a spring portion connecting between the tab joint portion and the contact portion.

  Here, it is preferable that the tab joint portion and the spring portion are formed on the same plane.

  The voltage detection terminal is preferably formed by punching a metal plate.

  The plate with a terminal according to the present invention includes the voltage detection terminal and a plate attached to an end of the thin battery, and the contact portion of the voltage detection terminal is fixed to the plate. In addition, the gist is that the spring part and the tab joint part are not fixed to the plate.

  The battery module according to the present invention has a thin plate-shaped battery body in which a power generation element is sealed by an exterior material, and a thin tab having a tab connected to an electrode of the power generation element and led out from an end of the exterior material. A battery module in which a plurality of batteries are stacked in the thickness direction, the battery module having at least one plate with terminals, and a tab of the thin battery, and a tab joint portion of a voltage detection terminal in the terminal plate. The gist is that is bonded.

  In the voltage detection terminal according to the present invention, the tab joint portion and the contact portion are connected by a spring portion. Therefore, even if the contact portion is completely fixed to the plate, the tab joint portion can be freely moved to some extent via the spring portion. As a result, there is no possibility that the contact portion moves and sliding wear occurs, and ultrasonic weldability between the tab of the thin battery and the tab joint portion can be ensured.

  Here, when the tab joint portion and the spring portion are formed on the same plane, it is possible to ultrasonically vibrate the tab joint portion along the planar direction, and ultrasonic welding with the tab of the thin battery. It becomes easy to secure the sex.

  Further, when the voltage detection terminal is formed by punching a metal plate material, the tab joint portion and the spring portion can be easily formed on the same plane. Therefore, it becomes easy to obtain the above-described effect.

  In the plate with a terminal according to the present invention, the contact portion of the voltage detection terminal is fixed to the plate. Therefore, sliding wear between the connector-side terminal of the voltage detection wire harness and the contact portion of the voltage detection terminal can be suppressed. Moreover, the said spring part and the said tab junction part are not being fixed to the said plate among the said terminals for voltage detection. Therefore, the tab joint portion can be freely moved to some extent via the spring portion, and ultrasonic welding between the tab of the thin battery and the tab joint portion of the voltage detection terminal is easy.

  The battery module according to the present invention uses the terminal plate, and the tab of the thin battery and the tab joint of the voltage detection terminal are joined. Therefore, it is possible to suppress sliding wear between the terminal on the connector side of the voltage detection wire harness and the contact portion of the voltage detection terminal, and the electrical connection with high reliability of connection with the connector of the voltage detection wire harness. Can be secured.

It is an external appearance perspective view which shows the Example of the battery module of this invention. It is a front view which shows the state which expanded the connector fitting part of FIG. It is a top view of FIG. It is a right view of FIG. It is a perspective view which shows an example of the laminated battery of FIG. It is typical sectional drawing which follows the AA line of FIG. FIG. 2 is an exploded perspective view showing a plate assembly on the front side of the laminate battery of FIG. 1 and a part of the laminate battery. A guide plate is shown, (a) is a perspective view, (b) is a top view. It is sectional drawing which follows the BB line of FIG. A terminal plate is shown, (a) is a perspective view, (b) is a top view. A spacer plate is shown, (a) is a perspective view, (b) is a top view. It is a perspective view of a voltage detection terminal.

  1 is an external perspective view showing an embodiment of the battery module of the present invention, FIG. 2 is a front view showing an enlarged state of the connector fitting portion of FIG. 1, and FIG. 3 is a plan view of FIG. 4 is a right side view of FIG. As shown in FIGS. 1 to 4, in the battery module 10 of the present invention, a plurality of flat unit cells such as laminated batteries 200 (201 to 208) are stacked in the thickness direction, and each unit cell is electrically connected. Are connected in parallel or in series as a single module.

  The battery module 10 of the embodiment shown in FIG. 1 includes a unit cell laminate 20 in which eight laminate batteries 201 to 208 are laminated as a unit cell, and a plate assembly 100 at the front end of the unit cell laminate 20. And a plate assembly 100a at the rear end. The battery module 10 configured as described above is housed in a case body (not shown) formed from a metal plate such as a steel plate or an aluminum plate, and is in an assembled battery state in which a plurality of battery modules 10 are combined. It is installed in automobiles.

  In the present invention, the planar shape of the laminated battery 200 is rectangular, and for convenience, the longitudinal direction of the laminated battery 200 will be described as the front-rear direction.

  In the battery module 10, both ends in the front-rear direction of the unit cell stack 20 in which a plurality of laminate batteries 201 to 208 are stacked are fixedly held by a front plate assembly 100 and a rear plate assembly 100a, and the plurality of laminate batteries 201-208 are integrated.

  Each of the plate assemblies 100 and 100a is configured by laminating a plurality of plates corresponding to the number of laminated batteries 200 constituting the unit cell stack 20. In the embodiment shown in FIG. 1, eight plates, each having the same number as the number of laminated batteries, are laminated to constitute one plate assembly 100, 100a. The plate assemblies 100, 100 a have a function as a fixing member that supports end portions in the front-rear direction of the laminated batteries 201 to 208 and holds the state of the unit cell stack 20. Furthermore, the plate assemblies 100 and 100a also have a function as an interface unit for electrically connecting the battery module 10 and the outside.

  The front plate assembly 100 includes electrode terminals 41 and 42 for taking out electricity from the cell stack 20, electrode tabs such as positive and negative tabs of the laminated batteries 201, 203, 205, and 207, and voltage detection tabs. There are provided four voltage detection terminals 140 (details will be described later) connected to the tabs.

  A connector fitting portion comprising a terminal assembly in which four voltage detection terminals 140 are arranged in a vertical line along a lamination battery stacking method and arranged together at a substantially central position in the left-right direction of the plate assembly 100. 150 is provided.

  The rear plate assembly 100a includes four voltage detection terminals connected to electrode tabs such as positive electrode tabs and negative electrode tabs of each laminated battery 202, 204, 206, 208 and tabs such as voltage detection tabs. 140 is provided. The plate assembly 100a has a connector fitting portion 150a formed of a terminal assembly in which four voltage detection terminals 140 are arranged in a vertical line along the laminated battery stacking direction and are gathered together.

  In this battery module 10, the voltage detection terminals 140 of the four laminated batteries 201, 203, 205, and 207 of the front connector fitting portion 150 are bundled together with one connector 300 connected to four wire harnesses. Then, the voltage detection terminals 140 of the four laminated batteries 202, 204, 206, 208 of the rear connector fitting portion 150a are connected together with another connector (not shown). By simply fitting two connectors connected to the four wire harnesses into the two connector fitting portions 150 and 150a of one battery module 10, they are connected to the eight laminated batteries 201 to 208. In addition, all the eight voltage detection terminals 140 can be connected to the wire harness.

  As shown in FIG. 2, the connector fitting portion 150 of the plate assembly 100 is provided with hood portions 160 and 162 that cover the pin-type contact portion 141 (see FIG. 12) of the voltage detection terminal 140. Each hood part 160, 162 individually covers the periphery of each pin-type contact part 141. The connector fitting portion 150 is partitioned for each pin-type contact portion 141 by the hood portions 160 and 162. Each of the hood portions 160 and 162 is formed in a square tube shape having a square cross section, and has a length that covers the periphery of the pin-type contact portion 141 with an opening on the front side.

  In order to connect the connector 300 to the battery module 10, the terminal cavities 301 of the connector 300 are inserted into the hood portions 160 and 162 of the connector fitting portion 150 of the battery module 10. In the connector 300, a box-type terminal (not shown) into which the pin-type contact portion 141 is inserted is embedded in the terminal cavity 301, and each box-type terminal is connected to a wire harness (not shown). . When the terminal cavities 301 are inserted into the hood portions 160 and 162, the pin-type contact portions 141 inside the hood portions 160 and 162 come into contact with the box-type terminals fixed in the terminal cavities 301, and the connector 300 has a box shape. The wire harness connected to the terminal and the voltage detection terminal 140 of the battery module 10 are electrically connected.

  FIG. 5 is a perspective view showing an example of the laminated battery of FIG. 1, and FIG. 6 is a schematic cross-sectional view taken along the line AA of FIG. Laminated batteries 201 to 208 are flat thin batteries, and for example, lithium ion secondary batteries can be used. The internal structure of the laminated batteries 201 to 208 basically has the structure shown in FIGS. Note that the positions and shapes of the positive electrode tab and the negative electrode tab may differ from those shown in FIG.

  As shown in FIGS. 5 and 6, the laminated battery 200 includes a power generation element 212 including an electrolyte, a battery main body 211 in which the power generation element 212 is sealed with an exterior material 213 including a laminate film 213A and a laminate film 213B, A positive electrode tab 214 and a negative electrode tab 215 led out from the power generation element 212 are provided. The positive electrode tab 214 and the negative electrode tab 215 (electrode tab) are used as electrode terminals for drawing out current or as tabs to which the voltage detection terminals 140 are attached. In addition to the positive electrode tab 214 and the negative electrode tab 215 (electrode tab), a voltage detection tab electrically connected to the electrode tab may be led out from the end of the exterior material 213. Furthermore, it is also possible to connect a voltage detection tab as a separate tab to the positive electrode tab 214 and the negative electrode tab 215 (electrode tab), and attach the voltage detection terminal 140 via the voltage detection tab.

  In the laminated battery 200, the power generation element 212 is sealed between the laminated films 213A and 213B, and the peripheral portions of the laminated films 213A and 213B are welded to form the joined portions 211a, 211b, 211c, and 211d where the films are joined together. By doing so, it is formed in a bag shape.

As an electrolyte used for the power generation element 212, in addition to an electrolyte liquid prepared by dissolving an electrolyte salt in a nonaqueous solvent, a polymer gel electrolyte in which a solution obtained by dissolving an electrolyte salt in a nonaqueous solvent is held in a polymer matrix Etc. can be used. As the electrolyte salt, a lithium salt exhibiting ionic conductivity is used. Examples of such a lithium salt include LiClO ₄ , LiAsF ₆ , LiPF ₆ , LiBF ₄ , LiB (C ₆ H ₅ ) ₄ , LiCl, LiBr, CH ₃ SO ₃ Li, and CF ₃ SO ₃ Li. These electrolyte salts may be used individually by 1 type, and may mix and use 2 or more types.

  The power generation element 212 may be of a stacked structure such as a bipolar battery in which bipolar electrodes are stacked via an electrolyte layer, for example. Although not shown in particular, the bipolar electrode has a positive electrode active material layer formed on one surface of a current collector and a negative electrode active material layer formed on the other surface. The bipolar battery has a structure in which one single battery layer is formed by the positive electrode active material layer, the electrolyte layer, the negative electrode active material layer, and the like, and a plurality of the single battery layers are stacked. Furthermore, an insulating layer for insulating adjacent current collectors is provided on the outer periphery of the single cell layer.

The positive electrode plate in the power generation element 212 has a positive electrode active material layer made of a lithium-transition metal composite oxide such as LiMn ₂ O ₄ , for example. The negative electrode plate has, for example, a negative electrode active material layer made of carbon and a lithium-transition metal composite oxide. The separator is made of, for example, porous polyethylene having air permeability that can penetrate the electrolyte.

  As shown in FIG. 6, on the positive electrode side of the power generation element 212, an outermost current collector is extended and led out of the exterior material 213 to be formed as a thin plate-like positive electrode tab 214. On the other hand, on the negative electrode side of the power generation element 212, an outermost current collector is extended and led out of the exterior material 213 to be formed as a thin plate-like negative electrode tab 215. The positive electrode tab 214 and the negative electrode tab 215 are led out of the battery body 211 from the joint portion 211a at the front end portion and the joint portion 211b at the rear end portion of the battery body 211.

  The power generation element 212 may have a structure other than the bipolar battery. For example, a power generation element in which a positive electrode plate in which a positive electrode active material layer is formed on both sides of a current collector and a negative electrode plate in which a negative electrode active material layer is formed on both sides of the current collector are alternately stacked via separators is used. A battery body is formed by sealing inside the exterior material, and a positive electrode tab electrically connected to the positive electrode plate and a negative electrode tab electrically connected to the negative electrode plate are led out from the battery body. A formed battery may be used.

  Since the two laminate films 213A and 213B of the exterior material 213 can be reduced in weight and have good thermal conductivity, metals (including alloys) such as aluminum, stainless steel, nickel, and copper are used as polypropylene films. It is preferable to use a polymer-metal composite laminate film coated with an insulator such as. The laminate battery 200 can be formed to be lightweight and thin by using a laminate film as an exterior material, and a thin single battery having flexibility and excellent heat dissipation can be obtained.

  FIG. 7 is an exploded perspective view showing a plate assembly on the front side of the laminate battery of FIG. 1 and a part of the laminate battery. As shown in FIG. 7, the plate assembly 100 is configured by combining eight types of plates. It should be noted that the rear plate assembly 100a is attached in the opposite vertical direction and the arrangement order of the plates as compared with the front plate assembly 100, and the electrode terminals 41 and 42 are not provided. Although it is different, the basic plate combination is common. Hereinafter, the configuration of the plate assembly 100 will be described in detail, and the description of the plate assembly 100a will be omitted.

  The plate assembly 100 includes one guide plate 110, three terminal plates 120 disposed on the guide plate 110, and four spacer plates 130 disposed on the guide plate 110 or the terminal plate 120. The arrangement of the plates of the plate assembly 100 is in the order of the guide plate 110, the spacer plate 130, the terminal plate 120, the spacer plate 130, the terminal plate 120, the spacer plate 130, the terminal plate 120, and the spacer plate 130 from the bottom. . Each of the plates of the plate assembly 100 is joined with a joining portion 211 a at the front end of one laminated battery 200.

  FIG. 8 shows a guide plate, (a) is a perspective view, and (b) is a plan view. FIG. 9 is a cross-sectional view taken along line BB in FIG. FIG. 10 shows a terminal plate, (a) is a perspective view, and (b) is a plan view. FIG. 11 shows a spacer plate, (a) is a perspective view, and (b) is a plan view. In these plates, the portions other than the voltage detection terminal 140 and the collar portions 115 and 125 may be formed of an insulating material, and can be formed of resin, rubber, or the like. The bottom surfaces of these plates are basically formed as flat surfaces from which no protrusions protrude.

  Among these plates, the guide plate 110 and the terminal plate 120 are plates to which the voltage detection terminals 140 are fixed, and the guide plate 110 further includes a guide portion 180 that regulates the movement of the terminal plate 120. . The terminal plate 120 includes a guided portion 185 that is guided by the guide portion 180 of the guide plate 110. The spacer plate 130 is a plate that is located between or on the plates including the voltage detection terminals 140 and does not have the voltage detection terminals 140. Hereinafter, the voltage detection terminal and each plate will be described in detail.

  FIG. 12 is a perspective view of the voltage detection terminal. As shown in FIG. 12, the voltage detection terminal 140 includes a pin-type contact portion 141 serving as a connection portion with a connector 300 to which a voltage detection wire harness (not shown) is connected, and (electrode tab, Alternatively, a voltage detection tab electrically connected to the electrode tab) is joined by ultrasonic welding, and a tab-like tab joint portion 142, and a spring portion that connects between the pin-type contact portion 141 and the tab joint portion 142. 143.

  The pin-type contact portion 141 is formed in a pin shape so that its tip projects forward. The spring part 143 extends from the base end of the pin type contact part 141 in a direction perpendicular to the protruding direction of the pin type contact part 141. The spring part 143 is bent and formed in a substantially S shape. Specifically, it is bent once in the front-rear direction so that the tab joint 142 can be ultrasonically vibrated in the front-rear direction. The shape of the spring portion 143 can be designed in consideration of the vibration direction of the tab joint 142 due to the ultrasonic waves. The number of times to be bent is not particularly limited, and can be formed into a shape having a plurality of bending points. The shape of the spring part 143 may be a zigzag shape or the like. The tab-shaped tab joint 142 is connected to the end of the spring 143 opposite to the pin-type contact 141.

  The voltage detection terminal 140 is formed by punching a metal plate material such as copper, copper alloy, aluminum, or aluminum alloy, and the spring portion 143 and the tab joint portion 142 are formed in the same plane. Therefore, it is easy to ultrasonically vibrate the tab joint 142 along the planar direction. The pin-type contact portion 141 is formed by further bending after the punching of the metal plate material. Specifically, the pin-type contact portion 141 is erected in a direction perpendicular to the plane on which the spring portion 143 and the tab joint portion 142 are formed. When the pin-type contact portion 141 is formed in this way, the rear end portion of the pin-type contact portion 141 can be easily pushed by a jig or the like, which is suitable for press-fitting and fixing the pin-type contact portion 141 to the plate.

  As shown in FIGS. 8A and 8B, the guide plate 110 has a rear side in the short direction formed as a battery joint portion 111 for joining the laminated battery 200, and is formed at both ends in the longitudinal direction on the front side. A plate support portion 112 that supports the plates is formed. In the guide plate 110, a terminal holding portion 113 is formed between the plate support portions 112, and a voltage detection terminal 140 is fixed to a predetermined position on the terminal holding portion 113. Specifically, a hood part 160 is provided at the center in the longitudinal direction of the terminal holding part 113, and press-fitting for press-fitting and fixing the pin-type contact part 141 of the voltage detection terminal 140 to the rear end of the hood part 160. A portion 113a is formed. The press-fitting portion 113 a functions as a fixing portion that fixes the pin-type contact portion 141 to the guide plate 110. A press-fitting hole 113b is formed on the rear surface of the press-fitting part 113a, and the pin-type contact part 141 is press-fitted and fixed to the press-fitting hole 113b. That is, among the voltage detection terminals 140, the tip of the pin-type contact portion 141 is fixed to the press-fit portion 113a of the guide plate 110, but the other spring portion 143 and the tab joint portion 142 are the guide plate. 110 is not fixed.

  As shown in FIG. 9, the press-fit hole 113 b communicates with the internal space of the hood part 160, and the tip of the pin-type contact part 141 press-fitted into the press-fit hole 113 b projects into the hood part 160. At this time, the positions of the press-fitting hole 113b and the hood part 160 are set in advance so that the pin-type contact part 141 is positioned at substantially the center of the hood part 160. The periphery of the press-fitted pin-type contact part 141 is Covered by the hood section 160.

  The terminal holding portion 113 of the guide plate 110 is provided with a rectangular opening window portion 114 penetrating from the front surface to the back surface along the stacking direction. One opening window 114 is provided on each of the left and right sides of the hood 160. Of the voltage detection terminal 140, the tab joint 142 is disposed so as to face the opening window 114. That is, the tab joint portion 142 is supported by the spring portion 143 extending from the base end of the fixed pin-type contact portion 141 and is disposed on the opening window portion 114. The tab joint 142 is connected to a tab such as an electrode tab or a voltage detection tab of the laminated battery 200 on the opening window 114.

  The terminal holding portion 113 of the guide plate 110 is provided with a guide portion 180 for regulating the terminal position of the terminal plate 120 on the left side surface of the hood portion 160. The guide portion 180 and the hood portion 160 of the guide plate 110 are integrally formed. The guide portion 180 is erected upward in the stacking direction, and includes a first guide plate 181 made of a plate-like body, a second guide plate 182 made of a plate-like body, and a connection portion 183 that connects the first guide plate 181. Is formed in an H-shape. The first guide plate 181 is formed to be slightly shorter than the second guide plate 182 in the plate lateral direction.

  10A and 10B show a terminal plate, FIG. 10A is a perspective view, and FIG. 10B is a plan view. As shown in FIGS. 10A and 10B, the terminal plate 120 is provided with a guided portion 185 through which the first guide plate 181 of the guide portion 180 of the guide plate 110 is inserted on the right side surface of the hood portion 162. Yes. The guided portion 185 is formed in a shape that allows the first guide plate 181 of the guide portion 180 to be inserted by sliding from the vertical direction in the figure, which is the stacking direction. The guided portion 185 includes a front locking claw 186 and a rear locking claw 187 that sandwich the first guide plate 181 of the guide portion 180 from the front side and the rear side. The thickness of the front locking claws 186 in the stacking direction is the same as the thickness of the hood portion 162. The thickness of the rear latching claw 187 in the stacking direction is formed to be half the thickness of the hood portion 162.

  When the terminal plate 120 is laminated above the guide plate 110 and the guided portion 185 is inserted through the guide portion 180, it is formed between the outer right side surface of the hood portion 162, the front locking claw 186 and the rear locking claw 187. The first guide plate 181 of the guide part 180 is sandwiched in the space to be formed. A connecting portion 183 of the guide portion 180 is located between the front locking claw 186 and the rear locking claw 187. The right side surfaces of the front locking claw 186 and the rear locking claw 187 come into contact with the left surface of the second guide plate 182 of the guide portion 180 when the guided portion 185 is inserted through the guide portion 180.

  When the terminal plate 120 is stacked above the guide plate 110, the terminal plate 120 is placed from directly above the guide plate 110. The guided portion 185 of the terminal plate 120 is inserted into the guide portion 180 of the guide plate 110. When the guided portion 185 of the terminal plate 120 is inserted through the guide portion 180 of the guide plate 110, the terminal plate 120 moves in the X direction (see FIG. 7), which is the short direction of the laminated battery 200, and the longitudinal direction of the laminated battery. The movement in the Y direction, which is the direction, is restricted. At this time, the terminal plate 120 can slide and move only in the Z direction, which is the stacking direction of the laminated battery 200, while being guided by the guide plate 110.

  As shown in FIG. 2, when the plate assembly 100 is assembled by stacking eight plates, the guide portion 180, the hood portions 160, 162, 162, 162, and the guided portions 185, 185, 185 are integrated. Thus, a rectangular connector fitting portion 150 is formed. In the state where the plate assembly 100 is stacked, the spacer plates 130 are stacked on the guide plate 110 and the terminal plate 120, respectively.

  Further, on the right side surface of the guide portion 180, when the connector 300 is fitted to the connector fitting portion 150, the guide portion 180 is engaged with the engagement portion of the connector 300 and the connector 300 is locked to the connector fitting portion 150. A locking projection 184 is provided.

  The guide plate 110 is provided with a flat plate-like short-circuit prevention wall 191 protruding forward at the terminal holding portion 113. The short-circuit prevention wall 191 is held at the end of the frame around the one opening window 114. The short-circuit prevention wall 191 is provided with reinforcing ribs. In addition, electrode terminal attachment portions 192 and 193 are provided on the plate support portion 112 of the guide plate 110, and the electrode terminals 41 and 42 are attached thereto. Since the short-circuit prevention wall 191 protrudes forward from the electrode terminals 41 and 42, when the front side of the battery module 10 contacts the conductive member, the two electrode terminals 41 and 42 simultaneously contact the conductive member. To prevent a short circuit between the electrode terminals 41 and 42.

  The guide plate 110 is provided with a collar portion 115 projecting upward in which a metal collar is embedded in plate support portions 112 at both ends. A through-hole penetrating the front and back of the plate is provided inside the collar portion 115. Similarly, the terminal plate 120 is provided with a collar portion 125 on the plate support portion 122. The collar portions 115 and 125 are formed to have a thickness equivalent to two plates. The spacer plate 130 is provided with through holes 135 at positions corresponding to the collar portions 115 and 125 of the plate support portion 132. The size of the through hole 135 is formed such that the collar portions 115 and 125 are fitted.

  When the spacer plate 130 is stacked on the guide plate 110 or the terminal plate 120, the collar portion 115 or the collar portion 125 is inserted from below the through hole 135. In the plate assembly 100, the four collar portions 115, 125, 125, 125 provided on the guide plate 110 and the terminal plate 120 are integrated in the stacking direction to form a single sleeve 170. Bolts can be inserted into the sleeve 170 and nuts or the like can be fastened to press the plate assembly 100 in the stacking direction. At this time, the collar portions 115 and 125 and the bolts and nuts function as fixing means for restricting the movement of the terminals of the terminal plate in the stacking direction of the plate assembly 100 (Z direction in FIG. 7). Since the diameter of the collar portions 115 and 125 is slightly larger than the diameter of the bolt, the bolt can be easily inserted. The bolts are inserted into the collar portions 115 and 125 and fixed with nuts to restrict the movement of the terminal position in the ZX direction and the ZY direction. The restriction of the movement in the XY direction is due to the structure of the guide portion 110 and the guide portion 180 and the guided portion 185 of the terminal plate 120.

  As shown in FIGS. 8A and 8B, the guide plate 110 has a battery junction 111 formed in a flat plate shape. In addition, the battery joining portion 111 is provided with a slit 116 that penetrates the front and back along the stacking direction and extends to the left and right. A part of the joining portion 211a at the front end of the laminated battery 200 is joined to the battery joining portion 111 with a hot melt adhesive or the like. Cylindrical protrusions 118 are provided on the left and right ends of the battery joint 111. A through hole 220 provided in the joint portion 211 a of the laminate battery 200 is inserted into the protrusion 118.

  Further, the plate support portion 112 is formed as a flat plate portion 112 a whose upper surface side is formed one step higher than the surface of the battery bonding portion 111. The flat plate portion 112a is provided with the collar portion 115 described above. When a spacer plate is stacked on the guide plate 110, the bottom surface of the plate support portion 132 of the spacer plate 130 abuts on the flat plate portion 112a without any gap, and the spacer plate 130 is supported.

  As shown in FIGS. 10A and 10B, the terminal plate 120 includes a battery joint portion 121, a plate support portion 122, and a terminal holding portion 123. The basic structure of the battery joint portion 121 and the plate support portion 122 of the terminal plate 120 is the same as that of the guide plate 110.

  In the terminal plate 120, a voltage detection terminal 140 having the same shape as the voltage detection terminal 140 assembled to the guide plate 110 is fixed to the terminal holding portion 123. Specifically, a press-fit portion 123b equivalent to the press-fit portion 113a of the guide plate 110 is formed at the rear end of the hood portion 162, and the voltage detection terminal 140 is inserted into a press-fit hole (not shown) of the press-fit portion 123b. A pin-type contact portion 141 is press-fitted and fixed. That is, like the voltage detection terminal 140 in the guide plate 110, the pin-type contact portion 141 of the voltage detection terminal 140 is fixed to the press-fit portion 123b of the terminal plate 120, but the other spring portions. 143 and the tab joint 142 are not fixed to the terminal plate 120. Note that the relationship between the hood portion 162 and the pin-type contact portion 141 is substantially the same as that described with reference to the guide plate 110, and thus the description thereof is omitted.

  The terminal holding portion 123 is provided with an opening window portion 123a. The opening window portion 123a is different in structure from the opening window portion 114 of the guide plate 110 in that the opening window portion 123a is formed in a shape that also opens on the end side. Of the voltage detection terminals 140, the tab joint 140 is disposed so as to face the opening window 123a. That is, the tab joint 140 is supported by the spring part 143 extending from the base end of the fixed pin-type contact part 141, and is arranged on the opening window part 123a. The tab joint 140 is connected to a tab such as an electrode tab or a voltage detection tab of the laminated battery 200 on the opening window 123a.

  As shown in FIGS. 11A and 11B, the spacer plate 130 includes a battery joint portion 131, a plate support portion 132, and a spacer portion 133. The basic structure of the battery joint portion 131 of the spacer plate 130 has a common shape with the guide plate 110. The left and right ends of the spacer plate 130 in the longitudinal direction are formed as plate support portions 132, and a through hole 135 into which the collar portions 115 and 125 are fitted is provided in the center of the flat plate portion 132a.

  In the guide plate 110, the terminal plate 120, and the spacer plate 130, the flat plate portions 112a, 122a, and 132a are formed to have the same thickness.

  The spacer portion 133 of the spacer plate 130 is provided with opening window portions 134 and 134 and a central portion 137 connecting them. Further, a recess 139 is provided in the middle of the central portion 137 in the longitudinal direction of the plate. When the spacer plate 130 is stacked on the guide plate 110 or the terminal plate 120, the rear ends of the press-fit portions 113a and 123b are fitted into the recess 139.

  When the spacer plate 130 is stacked on the guide plate 110 and the terminal plate 120, the collar portions 115 and 125 of the guide plate 110 and the terminal plate 120 are inserted into the through holes 135 of the spacer plate 130. Since the lower surface of the plate holding portion of the spacer plate 130 is flat, the spacer plate 130 is supported by the plate support portions 112 and 122 of the guide plate 110 and the terminal plate 120. At this time, since the battery joint portions 111, 121, 131 are formed to be one step thinner than the plate support portions 112, 122, a space is formed between the plates of the battery joint portion 131. A part of the joining portion 211a at the end of the laminated battery 200 is sandwiched in this space together with the hot melt adhesive. In the plate support portions 112, 122, and 123, the plates are stacked without any gap. The voltage detection terminal 140 can be fixed at an accurate position in the stacking direction.

  Further, the periphery of the collar portions 115 and 125 is formed as flat plate portions 112a and 122a. The flat plate portions 112 a and 122 a are formed so as to be one step higher than the battery joint portions 111 and 121. In these plates, the thickness of the flat plate portions 112a, 122a, 132a is the basic plate thickness. The plate is supporting the plate laminated | stacked on it by the flat plate part.

  As shown in FIG. 7, except for the uppermost plate 130, another plate is stacked on the battery joints 114, 124, and 134 of each plate. On the battery joint portions 114, 124, and 134 of each plate, the joint portions 211 a at the ends of the laminated batteries 201 to 208 are joined by a resin such as hot melt or an adhesive.

  In assembling the battery module 10, known means as described in JP-A-2007-172893 can be used to electrically connect the laminated batteries 201 to 208. Laminated batteries 201-208 are connected in series, for example, and can be assembled from three subassemblies as described below. As the uppermost first assembly, three laminated batteries 206 to 208 are connected in series, and the minus terminal is assembled. As the second second assembly, two laminated batteries 204 to 205 are connected in series. As the third assembly at the bottom, three laminated batteries 201 to 203 are connected in series, and a positive output terminal is assembled. The tabs of the first assembly and the second assembly are joined together. The tabs of the second assembly and the third assembly are joined together. The battery module 10 in which the laminated batteries 201 to 208 are connected in series is obtained.

  The tab joint 142 of the voltage detection terminal 140 is desired from the opening windows 114 and 123a provided in the guide plate 110 and the terminal plate 120, and is joined to the electrode tab of the laminated battery by ultrasonic welding at the opening windows 114 and 123a. Integrated.

  In the voltage detection terminal 140, the tab joint portion 142 and the pin-type contact portion 141 are connected by a spring portion 143. Therefore, even if the pin-type contact portion 141 is completely fixed to the guide plate 110 or the terminal plate 120, the tab joint portion 142 can be freely moved to some extent via the spring portion 143. As a result, there is no possibility that the pin-type contact portion 141 moves and sliding wear occurs, and ultrasonic weldability between the tab of the laminated battery and the tab joint 142 can be ensured.

  The battery module 10 using the voltage detection terminal 140 and the plate with terminals (the guide plate 110 and the terminal plate 120) includes a terminal on the connector side of the voltage detection wire harness and a pin-type contact portion 141 of the voltage detection terminal 140. Therefore, it is possible to secure electrical connection with high connection reliability with the connector of the voltage detection wire harness.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, in the above-described embodiment, the pin shape that is advantageous for reducing the fitting force of the connector is shown as the contact portion of the voltage detection terminal, but a tab shape or the like may be used.

  Further, in the above embodiment, the voltage detection terminal 140 is fixed to the plate by press-fitting the pin-type contact portion 141 of the voltage detection terminal 140 into the press-fit portions 113a and 123b of the guide plate 110 and the terminal plate 120. Although an example has been shown, in addition to this, a part of the rear end of the pin-type contact portion 141 or the like can be embedded in the terminal holding portion 113 to be fixed to the plate. Further, in place of the press-fit portions 113a and 123b, a fixing portion having a communication hole having a locking hole is formed, and a locking projection that fits into the locking hole is formed in the pin-type contact portion 141, thereby forming a pin type When the contact portion 141 is inserted through the communication hole, the voltage detection terminal 140 can be fixed to the plate by fitting the locking protrusion into the locking hole.

  In addition, as for the lamination method of the laminated batteries, all the batteries (201, 202), (203, 204), (205, 206), (207, 208) coupled in parallel may be connected in series instead of being connected in series. .

DESCRIPTION OF SYMBOLS 10 Battery module 110 Guide plate 120 Terminal plate 130 Spacer plate 140 Voltage detection terminal 141 Pin type contact part 142 Tab joint part 143 Spring part

Claims (5)

A voltage used for voltage detection of a thin battery having a thin plate-shaped battery body in which a power generation element is sealed with an exterior material, and a tab connected to an electrode of the power generation element and led out from an end of the exterior material. A detection terminal,
A tab joint where the tab of the thin battery is joined by ultrasonic welding;
A contact portion that becomes a connection portion with the connector to which the voltage detection wire harness is connected;
A voltage detection terminal comprising: a spring portion connecting between the tab joint portion and the contact portion.   The voltage detection terminal according to claim 1, wherein the tab joint portion and the spring portion are formed on the same plane.   3. The voltage detection terminal according to claim 1, wherein the voltage detection terminal is formed by punching a metal plate material. The voltage detection terminal according to any one of claims 1 to 3, and a plate attached to an end of the thin battery,
Among the voltage detection terminals,
The contact portion is fixed to the plate, and the spring portion and the tab joint portion are not fixed to the plate. A plurality of thin batteries having a thin plate-shaped battery body in which a power generation element is sealed with an exterior material, and tabs connected to the electrodes of the power generation element and led out from an end of the exterior material in the thickness direction. A stacked battery module,
Having at least one plate with terminals according to claim 4,
The battery module, wherein a tab of the thin battery and a tab joint of a voltage detection terminal in the terminal-attached plate are joined.

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