JP2011034883A - Secondary battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a secondary battery pack capable of being miniaturized by reducing the number of parts. <P>SOLUTION: The secondary battery pack includes a plurality of secondary battery cells BT equipped with electrodes terminals 2 and 4, a housing provided with a case 10 housing the secondary battery cells BT and a lid 20 closing an opening of the case 10, and bus bars 30 electrically connecting the electrode terminals 2 and 4 of adjacent secondary battery cells BT. A circuit 20C for detecting a voltage of the secondary battery cells BT is integrally formed in the lid 20, and the circuit 20C and the bus bars 30 are electrically connected through connecting means 34 and 40. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a secondary battery pack, and more particularly, to a secondary battery pack including a plurality of secondary battery cells.

  In recent years, secondary batteries have been used as power sources for various electronic devices. For devices that require a high voltage, the mounting of a secondary battery module including a plurality of secondary battery cells connected in series has been studied.

  If the secondary battery cell is overcharged beyond the appropriate charge amount, gas may be generated with the decomposition of the electrolyte. When gas is generated by overcharging in this way, in the case of a sealed secondary battery cell, there is a risk of causing an explosion accident due to an increase in gas pressure inside the secondary battery cell.

  Conventionally, an assembled battery abnormality detection device including an abnormality detection circuit that detects an abnormality in voltage between positive and negative terminals of a unit cell has been proposed for an assembled battery in which a plurality of unit cells are connected in series (for example, Patent Documents). 1). The abnormality detection circuit of Patent Document 1 detects that the voltage between the positive and negative terminals of the unit cell is higher than the first predetermined voltage and is overcharged, and the voltage between the positive and negative terminals is the second predetermined voltage. It detects that the battery has fallen below the voltage and has entered an overdischarge state.

  As described in Patent Document 1, in order to obtain a voltage between positive and negative terminals of a secondary battery cell, a circuit for detecting a voltage between electrodes of the secondary battery cell, and an electrode of the secondary battery cell in this circuit A voltage supply means such as wiring for supplying the inter-voltage is required. Therefore, it is necessary to increase the size of the secondary battery pack in order to accommodate circuits, wiring, and the like, and it is difficult to reduce the number of parts.

JP 2003-303626 A

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a secondary battery pack capable of reducing the number of parts and reducing the size.

  A secondary battery pack according to an aspect of the present invention includes a plurality of secondary battery cells having electrode terminals, a case in which the secondary battery cells are accommodated, and a container having a lid that closes the opening of the case. A bus bar for electrically connecting the electrode terminals of the adjacent secondary battery cells, and a circuit for detecting the voltage of the secondary battery cells is integrally formed on the lid, and the circuit The bus bar is a secondary battery pack that is electrically connected via connection means.

  ADVANTAGE OF THE INVENTION According to this invention, the secondary battery pack which can reduce a number of parts and can be reduced can be provided.

It is a figure for demonstrating the example of 1 structure of the secondary battery pack which concerns on 1st Embodiment of this invention. It is a figure for demonstrating an example of the component of the secondary battery pack shown in FIG. It is a figure which shows one structural example of the connection part of a bus-bar and voltage supply wiring. It is a figure which shows one structural example of the connection part of a bus-bar and voltage supply wiring. It is a figure which shows one structural example of the connection part of a bus-bar and voltage supply wiring. It is a figure for demonstrating one structural example of the cover body of the secondary battery pack shown in FIG. It is a figure for demonstrating the example of 1 structure of the secondary battery pack which concerns on 2nd Embodiment of this invention. FIG. 6 is a diagram for explaining an example of components of the secondary battery pack shown in FIG. 5. FIG. 6 is a diagram for explaining a configuration example of a lid body of the secondary battery pack shown in FIG. 5. FIG. 6 is a diagram for explaining a configuration example of a bus bar of the secondary battery pack shown in FIG. 5. FIG. 6 is a diagram for explaining a configuration example of a holding member of the secondary battery pack shown in FIG. 5. It is a figure for demonstrating an example of the component of the holding member shown in FIG.

  Hereinafter, the secondary battery pack according to the first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the secondary battery pack MDL according to the present embodiment includes a plurality of secondary battery cells BT and a container that houses the plurality of secondary battery cells BT.

  The container includes a case 10 that holds an end (not shown) on the bottom wall side of the secondary battery cell, and a lid 20 that closes an opening of the case 10. Case 10 and lid 20 are formed of an insulating material. In the present embodiment, the case 10 and the lid 20 are formed of a resin material.

  As shown in FIG. 2, each secondary battery cell BT includes a substantially rectangular parallelepiped container. Electrode terminals are arranged on the upper wall 9 of the container facing the bottom wall. The electrode terminal includes a negative electrode terminal 2 and a positive electrode terminal 4. A safety valve 6 is provided between the negative terminal 2 and the positive terminal 4.

  An electrolytic solution (not shown), a positive electrode (not shown), and a negative electrode (not shown) are accommodated in the container. The positive terminal 4 is electrically connected to the positive electrode, and the negative terminal 2 is electrically connected to the negative electrode. The positive electrode terminal 4 and the negative electrode terminal 2 protrude outward from the upper wall 9. The container is made of a conductive material such as aluminum.

  In a sealed battery, gas generated inside the container due to overcharge or the like may increase the gas pressure inside the container and cause an explosion accident. For this reason, the secondary battery cell BT can cope with an increase in gas pressure by providing a safety valve 6 on its upper wall 9. When the gas pressure in the secondary battery cell BT rises, the safety valve 6 is opened and the gas is released to the outside, and an explosion accident is avoided.

  The container of the secondary battery cell BT includes two main walls 1 extending between the upper wall 9 and the bottom wall and facing each other, and two side walls 8 extending between the main walls 1. The main wall 1 is substantially parallel to the direction in which the negative electrode terminal 2 and the positive electrode terminal 4 are arranged. The plurality of secondary battery cells BT are held in the case 10 at a predetermined interval so that the main walls 1 of the adjacent secondary battery cells BT face each other.

  The case 10 prevents the adjacent secondary battery cells BT from coming into contact with each other, and includes insulating means 14 for positioning the secondary battery cells BT, and a slit 12 communicating with the space between the secondary battery cells BT. It is equipped with. The insulating means 14 extends in a direction substantially orthogonal to the direction in which the plurality of secondary battery cells BT are arranged from the portion of the case 10 facing the side wall 8 of the secondary battery cell BT to the space between the secondary battery cells BT. By housing the secondary battery cell BT in such a case 10, the positioning of the secondary battery cell BT becomes easy.

  The slit 12 is provided in a portion of the case 10 that faces the side wall 8 of the secondary battery cell BT of the case 10 and is configured so that the cooling medium can be circulated between the secondary battery cells BT. Therefore, when the temperature of the secondary battery cell BT rises due to heat generated by charging / discharging of the secondary battery cell BT, the cooling medium (for example, circulating between the secondary battery cells BT through the slit 12 of the case 10) Air).

  The positive electrode terminal 4 is electrically connected to the negative electrode terminal 2 of the adjacent secondary battery cell BT by the bus bar 30. The secondary battery cells BT are connected in series by the bus bar 30. The bus bar 30 includes two electrode insertion openings 32 into which the positive terminal 4 and the negative terminal 2 are inserted. The electrode insertion port 32 of the bus bar 30 is fixed to the positive terminal 4 and the negative terminal 2 by welding, for example.

  Extraction members 30A for extracting electric power to the outside are attached to electrode terminals located at both ends of the plurality of secondary battery cells BT connected in series. The extraction member 30 </ b> A includes an electrode insertion port 32 </ b> A into which an electrode terminal is inserted, and is attached so that a part is exposed outside the lid 20 when the lid 20 is attached to the case 10.

  The bus bar 30 includes a protrusion 34 for taking out the voltage of each secondary battery cell BT. The protrusion 34 extends to the top surface 20T side of the lid 20 from the edge of the bus bar 30 that extends substantially parallel to the direction in which the plurality of secondary battery cells BT are arranged. The protrusion 34 includes an opening 34A.

  The top surface 20T of the lid 20 faces the upper walls 9 of the plurality of secondary battery cells BT. As shown in FIG. 4, a circuit 20 </ b> C including a wiring 20 </ b> W is formed on the top surface 20 </ b> T of the lid 20. One end of the wiring 20W is connected to the connector CNT. The connector CNT is fitted in the lid 20. A host control means (not shown) is connected to the connector CNT. The upper control means is means for controlling, for example, charging and discharging operations of the secondary battery pack MDL.

  A circuit pattern capable of fixing a chip resistor is created on the top surface 20T of the lid 20, and the chip resistor is connected to the circuit pattern with solder or a conductive adhesive. This chip resistance is the voltage from the secondary battery cell BT because the chip resistance is damaged before the secondary battery cell BT is damaged by the abnormal voltage of the secondary battery cell BT in the circuit 20C of the secondary battery cell BT. Is shut off to protect the upper control means.

  In the secondary battery pack MDL according to the present embodiment, the circuit 20C is integrally formed on the top surface 20T of the lid 20. By integrally molding the circuit 20C on the top surface 20T of the lid 20, it is possible to reduce the work of attaching a circuit for voltage detection to the secondary battery pack MDL. Further, by integrally molding the circuit 20C on the top surface 20T of the lid 20, the circuit 20C and the lid 20 are firmly connected, and the strength against vibration can be increased.

  Moreover, the structure which inserts and fixes the fitting type connector CNT to the cover body 20 can reduce the work man-hour of the secondary battery pack MDL, and can reduce the size of the secondary battery pack MDL.

  The other end 20WE of the wiring 20W is electrically connected to the connection member 40 or the thermistor SS. The thermistor SS is attached to the inside of the lid body 20. By configuring the circuit 20C so that the temperature is detected by the thermistor SS on the top surface 20T of the lid 20, the temperature in the vicinity of the secondary battery cell BT can be detected by an upper control means. Therefore, the upper control means can control the cooling fan to optimize the temperature of the secondary battery cell BT and efficiently operate the secondary battery pack MDL.

  As shown in FIGS. 3A to 3C, the connection member 40 extends substantially parallel to the top surface 20T of the lid body 20 and is held by the holding portion 22 provided on the top surface 20T of the lid body 20. 42, a second member 44 extending in a direction substantially orthogonal to the top surface 20T of the lid 20, and a third member 46 bent toward the top surface 20T from the end portion 44E from which the second member 44 extends. ing. 3A to 3C, the secondary battery cell BT is omitted for explaining the connection member 40 and the protrusion 34.

  In the direction in which the plurality of secondary battery cells BT are arranged, the width of the second member 44 is larger than the width of the third member 46. When the lid 20 is attached to the case 10, the third member 46 is inserted into the opening 34 </ b> A provided in the protrusion 34 of the bus bar 30, and the connection member 40 and the protrusion 34 are engaged.

  That is, after housing a plurality of secondary battery cells BT in the case 10 and connecting the electrode terminals of the adjacent secondary battery cells BT by the bus bar 30, the lid 20 is attached to the case 10 and at the same time, The voltage of the secondary battery cell BT can be acquired by engaging the wiring 20W with the connecting member 40 and the protrusion 34 as connecting means. Therefore, the assembly work of the secondary battery pack MDL becomes easy.

  As described above, by providing the bus bar 30 with the protrusion 34 extending toward the top surface 20T of the lid body 20, the bus bar 30 and the wiring 20W of the circuit 20C for voltage detection provided on the lid body 20 are connected to each other. It becomes possible to connect easily via 40.

  Furthermore, by providing the opening 34 </ b> A in the protrusion 34 of the bus bar 30, the protrusion 34 and the connection member 40 are engaged. The engagement between the protrusion 34 and the connection member 40 prevents the connection between the bus bar 30 and the connection member 40 from being interrupted by a load due to vibration or the like, or changes in the temperature or humidity of the surrounding environment. Can be improved.

  When the load due to vibration or the like is large, the connection member 40 is connected to the end portion 20WE of the wiring 20W by solder or a conductive adhesive to ensure the reliability of voltage detection. In that case, in the direction in which the plurality of secondary battery cells BT are arranged, the width of the first member 42 of the connection member 40 is made smaller than the width of the end portion 20WE to which the connection member 40 of the wiring 20W is connected. Then, the solder or the conductive adhesive becomes a fillet shape (a shape in which the connection materials are gently connected) generated on the bonding surface and the periphery, and the connection strength between the connection member 40 and the end portion 20WE of the wiring 20W is increased. it can.

  As described above, the circuit 20C for detecting the voltage of the electrode terminal of each secondary battery cell BT is provided on the top surface 20T of the lid 20 to reduce the mounting area of the secondary battery pack MDL. Thus, the size can be reduced, the number of parts can be reduced, the manufacturing process can be reduced, and the manufacturing cost can be reduced. That is, according to the secondary battery pack MDL according to the present embodiment, it is possible to provide a secondary battery pack that can be reduced in size and reduced in size.

  Even if the circuit 20C provided on the top surface 20T of the lid 20 is damaged, the lid 20 can be easily replaced or repaired, and the convenience for the user can be improved.

  Next, a secondary battery pack MDL according to a second embodiment of the present invention will be described below with reference to the drawings. In the following description, the same components as those of the secondary battery pack MDL according to the first embodiment described above are denoted by the same reference numerals and description thereof is omitted. As shown in FIGS. 5 and 6, the secondary battery pack MDL according to the present embodiment includes a plurality of secondary battery cells BT and a case 10 that holds end portions on the bottom wall side of the plurality of secondary battery cells BT. And a lid 20 that closes one opening of the case 10.

  As shown in FIGS. 5 and 6, in the secondary battery pack MDL according to the present embodiment, a circuit 20 </ b> C for detecting the voltage of the plurality of secondary battery cells BT is disposed on the outer surface 20 </ b> A side of the lid 20. ing. The voltage detection circuit 20C includes a plurality of wirings 20W. In the present embodiment, the circuit 20C is formed integrally with the outer surface 10A.

  As shown in FIG. 7, the lid 20 has a first opening 24 that exposes the electrode terminal of the secondary battery cell BT, and a second opening disposed between the first openings 24 in the direction in which the plurality of secondary battery cells BT are arranged. An opening 28, a third opening 26 disposed so as to sandwich the first opening 24 in a direction substantially orthogonal to the direction in which the plurality of secondary battery cells BT are arranged, and a fourth opening disposed in the vicinity of the second opening 28 29. The first opening 24, the second opening 28, the third opening 26, and the fourth opening 29 are provided so as to penetrate the lid body 2 from the top surface to the outer surface 20A.

  The lid 20 includes a gas discharge means 50 disposed at a position facing the safety valve 6 of the plurality of secondary battery cells BT. The gas discharge means 50 is configured to guide the gas discharged from the safety valve 6 to a gas discharge port 50H provided at the end. By providing the gas discharge means 50, the gas discharged from the safety valve 6 can be prevented from leaking outside, and the safety of the secondary battery pack MDL can be ensured.

  As shown in FIG. 8, the bus bar 30 of the secondary battery pack MDL according to the present embodiment includes two electrode insertion holes 32 into which the electrode terminals of the secondary battery cells BT are inserted and the direction in which the electrode insertion holes 32 are arranged. A buffer portion 38 disposed between the electrode insertion ports 32, a positioning portion 36 disposed on both sides of the electrode insertion port 32 in a direction substantially orthogonal to the direction in which the electrode insertion ports 32 are arranged, and a buffer portion 38. And a connecting portion 39 as connecting means.

  The bus bar 30A attached to the electrode terminals located at both ends of the plurality of secondary battery cells BT connected in series has an electrode insertion port 32A into which the electrode terminal is inserted and positioning positioned on both sides of the electrode insertion port 32A. 36A.

  The positioning portions 36, 36A, the buffer portion 38, and the connecting portion 39 extend in a direction substantially orthogonal to the flat plate on which the electrode insertion ports 32, 32A are formed. The buffer portion 38 is a portion where the flat plate on which the electrode insertion port 32 is formed is bent in a convex shape toward the lid 20, and is configured to absorb the force applied in the direction in which the electrode insertion ports 32 are arranged. Yes. The positioning portions 36 and 36A extend from the edges of the bus bars 30 and 30A substantially parallel to the direction in which the plurality of secondary battery cells BT are arranged in a direction substantially orthogonal to the flat plate on which the electrode insertion ports 32 and 32A are formed.

  The bus bar 30 is attached to the secondary battery cell BT so that the positive electrode terminal 4 and the negative electrode terminal 2 of the adjacent secondary battery cell BT are inserted into the two electrode insertion ports 32. The bus bar 30 is fixed in a state where the positive electrode terminal 4 and the negative electrode terminal 2 are electrically connected, for example, by welding.

  The plurality of secondary battery cells BT are accommodated in the case 10. As shown in FIGS. 9 and 10, the case 10 includes a partition member 16 including a plurality of holding holes 16 </ b> H that hold end portions on the bottom wall side of the plurality of secondary battery cells BT, and a frame that houses the partition member 16. 18.

  The partition member 16 is formed of an insulating material in order to insulate a plurality of secondary battery cells BT, and for example, resin molding is desirable. In the present embodiment, the frame 18 is made of a metal material such as aluminum. For example, the frame manufacturing cost can be reduced by forming the frame 18 of a metal such as aluminum. Moreover, the intensity | strength of the flame | frame 18 can be increased by using the flame | frame 18 as a metal material. The material of the frame 18 can be a metal or a resin material. Further, since the frame 18 itself has a simple frame structure, the manufacturing cost can be reduced.

  The frame 18 includes a window portion 10A disposed at a position facing the main wall 1 and a position facing the side wall 8 of the plurality of secondary battery cells BT. Since the window 10A of the frame 18 has a wide open surface, the amount of cooling medium circulating around the secondary battery cell BT can be increased.

  For example, in the slit 12 of the first embodiment described above, the cooling medium circulates only between the main walls 1 of the secondary battery cells BT, but the window portion 10A exposes the side walls 8 of the plurality of secondary battery cells BT. Therefore, the cooling medium circulates along the side wall 8 of the secondary battery cell BT, and the secondary battery cell BT can be further cooled.

  In this embodiment, the partition member 16 and the frame 18 are integrally molded, for example. For example, by integrally molding the partition member 16 made of a resin material and the frame 18 made of a metal material, the partition member 16 and the frame 18 are firmly connected, and the strength of the entire case 10 can be increased. Moreover, by integrally molding the partition member 16 and the frame 18, the number of connection steps for connecting them can be reduced.

  The plurality of secondary battery cells BT are positioned and fixed at predetermined intervals from the adjacent secondary battery cells BT by inserting the bottom wall end of the plurality of secondary battery cells BT into the holding hole 16H of the case 10. 18.

  When the bus bar 30 is attached to the electrode terminals of the plurality of secondary battery cells BT and the lid 20 is attached to the case 10, the positioning portion 36 of the bus bar 30 is inserted into the third opening 26 of the lid 20, and the plurality of secondary batteries Battery cell BT is positioned and fixed. The buffer portion 38 of the bus bar 30 is inserted into the second opening. The connection part 39 of the bus bar 30 is inserted into the fourth opening 29 of the lid 20.

  Connectors CNT1 and CNT2 are provided at the end of the lid body 20 in a direction substantially orthogonal to the direction in which the plurality of secondary battery cells BT are arranged. A wiring 20 </ b> W is formed on the outer surface 20 </ b> A on the outer side of the lid 20. One end of the wiring 20 </ b> W is connected to the connector CNT <b> 1 or the connector CNT <b> 2 and the other end extends to the fourth opening 29. That is, at the fourth opening 29, the other end of the wiring 20W is electrically connected to the connection portion 39 as a connection means.

  When assembling the above secondary battery pack MDL, the end of the bottom wall side of the secondary battery cell BT is inserted into the holding hole 16H, the plurality of secondary battery cells BT are accommodated in the case 10, and the electrode terminals A bus bar 30 is attached to a plurality of secondary battery cells BT connected in series. Thereafter, when the lid 20 is attached to the case 10, the positioning portion 36, the buffer portion 38, and the connecting portion 39 of the bus bar 30 are inserted into the third opening 26, the second opening 28, and the fourth opening 29 of the lid 20. , Penetrates to the outer surface 20A side.

  As a result, the lid 20 is attached to the case 10 and at the same time, the connecting portion 39 penetrating to the outer surface 20A side and the other end of the wiring 20W are electrically connected to each other and connected to the upper control means via the connectors CNT1 and CNT2. The voltage of the battery cell BT can be supplied.

  As described above, according to the secondary battery pack MDL according to the present embodiment, the circuit 20C provided on the outer surface 20A of the lid 20 allows the person who performs the assembly work to easily access the circuit 20C. . Further, even after the secondary battery pack MDL is assembled, the circuit 20C can be seen at a glance, so that it is easy to visually check the connection failure.

  In addition, when a failure occurs in the secondary battery cell BT and a liquid leak or the like is uttered, the circuit 20C is less likely to be short-circuited. Further, even when the temperature of the secondary battery cell BT rises due to charging and discharging of the secondary battery cell BT, the circuit 20C is not affected by the temperature rise, and the reliability of voltage detection is ensured. can do.

  That is, according to the secondary battery pack MDL according to the present embodiment, it is possible to provide a secondary battery pack that can be reduced in size and reduced in size. Further, according to the secondary battery pack MDL according to the present embodiment, the same effects as those of the secondary battery pack MDL according to the first embodiment described above can be obtained, and the connection member 40 is not necessary. Can be reduced.

  In addition, this invention is not limited to the said embodiment itself, In the stage of implementation, it can change and implement a component within the range which does not deviate from the summary. For example, the configuration of the case 10 is different between the first embodiment and the second embodiment. For example, even when the case 10 in the first embodiment is applied to the secondary battery pack MDL according to the second embodiment. The case 10 in the second embodiment may be applied to the secondary battery pack MDL according to the first embodiment. Even in that case, the same effect as the secondary battery pack MDL according to the first embodiment and the second embodiment can be obtained. In the secondary battery pack MDL according to the first embodiment and the second embodiment, the plurality of secondary batteries BT are connected in series. However, the present invention is also applicable to the case where they are connected in parallel.

  In the secondary battery pack MDL according to the second embodiment, the bus bar 30 includes the connection unit 39 as the connection unit. However, the connection unit may be the positioning unit 36 or the buffer unit 38. Even in that case, the same effect as the secondary battery pack MDL according to the second embodiment described above can be obtained.

  Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  MDL ... secondary battery pack, BT ... secondary battery cell, 2 ... negative electrode terminal, 4 ... positive electrode terminal, 9 ... upper wall, 10 ... case, 20 ... lid, 20C ... circuit, 30 ... bus bar, 34 ... projection, 38 ... buffer part, 39 ... connection part, 40 ... connection member.

Claims (12)

A plurality of secondary battery cells having electrode terminals;
A case in which the secondary battery cell is accommodated, and a container having a lid for closing the opening of the case;
A bus bar for electrically connecting the electrode terminals of the adjacent secondary battery cells, and
The lid is integrally formed with a circuit for detecting the voltage of the secondary battery cell,
A secondary battery pack in which the circuit and the bus bar are electrically connected via a connecting means. The circuit is disposed on a top surface of the lid that faces an upper wall of the plurality of secondary battery cells,
The connection means includes a connection member fixed so as to be electrically connected to the wiring of the circuit on the top surface of the lid, and a protrusion of the bus bar extending to the lid.
The secondary battery pack according to claim 1, wherein the connection member and the protrusion are electrically connected. The protrusion has an opening;
The connection member includes a first member extending in parallel with the top surface, a second member extending in a direction orthogonal to the top surface from an end portion of the first member, and an end portion extending from the second member. A third member bent toward the top surface side,
The secondary battery pack according to claim 2, wherein the third member is inserted into the opening and the protrusion and the connection member are engaged with each other. The lid includes the circuit arranged on the outer surface thereof, and a first opening penetrating the top surface of the lid facing the upper walls of the plurality of secondary battery cells and the outer surface. ,
The connection means includes a connection portion inserted into the first opening of the bus bar,
The secondary battery pack according to claim 1, wherein the circuit includes a wiring whose end is electrically connected to the connection portion in the first opening. The lid further includes a second opening penetrating the top surface and the outer surface of the lid,
The bus bar further includes a buffer portion inserted into the second opening,
The secondary battery according to claim 4, wherein the buffer portion has a convex shape that is bent so as to protrude from the top surface side of the lid facing the upper walls of the plurality of secondary battery cells to the outer surface side. pack. The lid further includes a third opening penetrating the lid and the top surface and the outer surface of the lid,
The secondary battery pack according to claim 4, wherein the bus bar includes positioning means inserted into the third opening.   The secondary battery pack according to any one of claims 1 to 6, wherein the case includes a partition portion made of an insulating material and extending between adjacent secondary battery cells.   The secondary battery pack according to claim 7, wherein the case includes a slit communicating with a space between the adjacent secondary battery cells. The case includes a partition member provided with a plurality of holding holes for defining a pitch at which one end of the plurality of secondary battery cells is inserted and the secondary battery cells are disposed;
The secondary battery pack according to claim 1, further comprising a frame that accommodates the partition member. The secondary battery cell includes a main wall facing each other, and a side wall extending between the main walls in a direction in which the plurality of secondary battery cells are arranged,
10. The second frame according to claim 9, wherein the frame includes a window portion facing the main wall of the secondary battery cell disposed at an end of the plurality of secondary battery cells and a side wall of the plurality of secondary battery cells. Next battery pack. The frame is made of metal;
The secondary battery pack according to claim 9 or 10, wherein the frame and the partition member are integrally formed. Further comprising a thermistor disposed in the vicinity of the plurality of secondary battery cells,
The secondary battery pack according to any one of claims 1 to 11, wherein the circuit further includes a wiring having an end connected to the thermistor.

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