JP2000331661A - Square nonaqueous electrolyte battery and battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a square nonaqueous electrolyte battery excellent in safety, and a battery module provided with the square nonaqueous electrolyte battery. SOLUTION: A round safety valve 9 is a stainless steel foil welded to a battery lid. Below the safety valve 9, upper surfaces on both ends of a horizontal I-shaped blocking preventing member 10 are fixed and placed on a bottom surface of the battery lid 8. The safety valve 9 is placed just above the blocking preventing member 10 and a copper plate 4. When an inner pressure of a square nonaqueous electrolyte battery increases and the safety valve cleaves, even if contents of an electrode group along with gas move toward the safety valve 9, they are blocked by the blocking preventing member 10 and the copper plate 4 and do not obstruct a cleavage part of the safety valve 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prismatic nonaqueous electrolyte battery and a battery module, and more particularly, to an electrode group housed in a prismatic battery case by laminating a positive electrode plate, a negative electrode plate, and a separator. A plurality of square non-aqueous electrolyte batteries and square non-aqueous electrolyte batteries each including a positive electrode and a negative electrode terminal that are conductive and fixed to the upper surface of the battery case, and The present invention relates to a battery module provided with a control circuit for controlling the entire electrolyte battery.

[0002]

2. Description of the Related Art At present, lithium primary batteries, lithium secondary batteries and the like have been put into practical use as nonaqueous electrolyte batteries. Among these batteries, a small lithium secondary battery having an electric capacity of about 1.5 Ah is, for example, a PTC (Positive Temper
ature Coefficient) Insert a device in series with the power generation device to add a current cut-off mechanism to cut off the current when the temperature rises, or to form a metal thin film on the boundary between the inside and outside of the battery and remove the metal thin film when the internal pressure of the battery rises. The safety of the non-aqueous electrolyte battery is ensured, for example, by adding an internal pressure reduction mechanism that breaks the battery and releases generated gas inside the battery and prevents damage to the battery container.

As described above, safety is emphasized even in a small battery, and it is needless to say that it is more important to secure the safety of a large battery having an electric capacity exceeding 10 Ah. As a large battery with an emphasis on safety, for example, Japanese Patent Application Laid-Open No. 9-92249 discloses a secondary battery technology provided with an opening valve for discharging generated gas inside the battery. According to the opening valve of the publication, the opening pressure can be set with good reproducibility and the opening pressure can be set low, so that the impact force at the time of releasing the pressure can be reduced.

[0004]

However, the technique disclosed in the publication does not describe a clear position of the opening valve. In addition, the publication is a technology relating to a cylindrical battery, and in the case of a prismatic battery having a low withstand voltage in a battery case due to its structural characteristics, an internal pressure reducing mechanism for releasing generated gas inside the battery is required to ensure safety. It becomes even more important.

Further, in the internal pressure reduction mechanism for breaking the metal thin film and releasing the generated gas, the safety function may not be exhibited unless the arrangement position of the metal thin film or the cleavage mechanism is sufficiently considered. That is, for example, when an object is placed directly above the metal thin film, even if the internal pressure rises and the metal thin film breaks to release the internally generated gas when the battery is abnormal, the object blocks the gas release path. Therefore, it is not possible to release the battery, and the battery container itself may be damaged. When the object is a control circuit for safely operating the nonaqueous electrolyte battery, the generated gas is directly injected from directly below the control circuit, so that the normally operating control circuit is destroyed or damaged. It becomes a state where control is impossible, and a state where the safety of the battery cannot be ensured.

The gas generated internally when the battery is abnormal is:
Releases vigorously at the same time as the metal thin film breaks. At this time, the battery contents such as the electrode group move together with the outflow gas in the direction of the metal thin film fracture part where the pressure is reduced, so that there is a problem that the gas discharge port is closed and the battery container is damaged.

The present invention has been made in view of the above circumstances, and has as its object to provide a rectangular non-aqueous electrolyte battery excellent in safety and a battery module including the rectangular non-aqueous electrolyte battery.

[0008]

Means for Solving the Problems In order to achieve the above object, a first aspect of the present invention is to provide an electrode group in which a positive electrode plate, a negative electrode plate and a separator are stacked and housed in a rectangular battery case,
A positive electrode and a negative electrode terminal, which are conductive from the electrode group and are fixed to the upper surface of the battery case, in a rectangular nonaqueous electrolyte battery, wherein the battery case has a fragile portion that is cleaved at a predetermined internal pressure; At least one of them is formed on the upper surface of the battery case, and at least one of the fragile portions formed on the upper surface of the battery case is disposed inside the battery case and is closed when the fragile portion is opened. Formed just above the blockage prevention member for preventing

In the present invention, the blocking prevention member is disposed inside the battery case and the fragile portion is formed immediately above the battery case. Therefore, when the fragile portion is broken due to an increase in the internal pressure of the battery, the contents of the battery accompanying gas release are prevented from blocking. Blockage of the fragile portion that has been cleaved by being locked by the member is prevented, and the internally generated gas can be reliably discharged. Also, by forming at least one fragile portion on the upper surface of the battery case to which the positive electrode, the negative electrode terminal, etc. are fixed, five surfaces other than the upper surface of the rectangular battery close to a rectangular parallelepiped are adhered to other objects and formed on the five surfaces. Even when the weakened portion is closed, the unevenly formed upper surface of the battery case such as the positive electrode and the negative electrode terminal is not closed, and the internally generated gas can be reliably discharged to the outside of the battery.

In this case, if the long conductive member having one end connected to the negative electrode plate in the electrode group and the other end connected to the negative electrode terminal is used as the blocking prevention member, it is necessary to newly provide a blocking prevention member. There is no. Further, if the conductive member is made of the same material as the current collector of the negative electrode plate, electrolytic corrosion can be prevented, so that the blocking prevention member can be prevented from becoming weak. The blocking prevention member may be a member that is electrically independent from the member that conducts the electrode group and the negative electrode terminal. Further, one end is connected to the negative electrode plate in the electrode group, and the other end is connected to the negative electrode terminal. A long conductive member, and a long member disposed directly above the conductive member and directly below the weak portion, insulated from the conductive member, and disposed at a position twisted with respect to the longitudinal direction of the conductive member. It may be configured.

According to a second aspect of the present invention, there is provided a battery module including the above-described rectangular nonaqueous electrolyte battery. In the present invention, in order to effectively use the space that has become a dead space due to the unevenness of the positive electrode and the negative electrode terminal fixed on the upper surface of the battery case, each square non-aqueous electrolyte battery and the whole square non-aqueous electrolyte battery are controlled in that space. By arranging the control circuit, a battery module with high energy density is realized.
Further, in order to prevent at least one fragile portion formed on the upper surface of the battery case of each rectangular nonaqueous electrolyte battery from being closed by the control circuit, except immediately above at least one fragile portion formed on the upper surface of each battery case, Since it is arranged on at least one of the upper surfaces of the respective battery cases, it is possible to secure a path for reliably releasing the gas generated when the battery is abnormal, and the generated gas is not directly injected from directly below the control circuit. Also, it is possible to avoid the danger that the normally operating control circuit may be destroyed or become uncontrollable. At this time, it is preferable that the control circuit is fixed to at least one of the upper surfaces of the respective battery cases via a control circuit protection material such as a flame-retardant ABS for protecting the control circuit.

[0012]

Embodiments of a battery module to which the present invention is applied will be described below with reference to the drawings.

As shown in FIG. 1, the battery module 30 according to the present embodiment includes a plurality of prismatic nonaqueous electrolyte batteries 20. As shown in FIG. 2, the rectangular non-aqueous electrolyte battery 20 has a rectangular stainless steel battery can 7 serving as a container for the rectangular non-aqueous electrolyte battery 20. The central portion of the battery can 7 accommodates an electrode group in which a plurality of positive electrode plates 5 and negative electrode plates 6 each having a rectangular shape and protruding upward in an upward direction are sandwiched by a separator (not shown) so that the both electrode plates do not directly contact each other. Have been. The positive electrode plate 5 has an aluminum foil as a positive electrode current collector, a positive electrode active material mixture is applied to both surfaces of the positive electrode current collector, and the negative electrode plate 5 has a copper foil as a negative electrode current collector and both surfaces of the negative electrode current collector. Is coated with a negative electrode active material mixture. The rectangular nonaqueous electrolyte battery 20 includes a battery cover 8 made of stainless steel. After the electrode group is inserted into the battery can 7, the periphery of the opening of the battery can 7 and the periphery of the battery cover 8 are welded. It is sealed by that.

The upper end of the ear portion of the positive electrode plate 5 is ultrasonically bonded to a thin aluminum plate 3 having a thickness of 2 mm. Battery cover 8
On one side, a screw hole is formed such that the positive electrode terminal 1 made of an aluminum screw rod is screwed into the battery lid 8 via a sealing material (not shown). The tip of the positive electrode terminal 1 is fixed to the upper part of the battery lid 8 with a nut, and the opposite end of the aluminum plate 3 on the ultrasonic bonding side and the opposite end of the positive electrode terminal 1 are tightened by bolts and nuts (illustrated). None) has been. On the other hand, the upper end of the ear portion of the negative electrode plate 6 is 2 m thick.
It is ultrasonically bonded to a thin copper plate 4 of m. Battery cover 8
On the side opposite to the side on which the positive electrode terminal 1 is fixed, a negative electrode terminal 2 made of a copper screw rod is provided with a battery cover 8 via a sealing material (not shown).
A screw hole is formed so as to be screwed. Negative electrode terminal 2
Is fixed to the upper part of the battery cover 8 by a nut, and the opposite end of the copper plate 4 on the ultrasonic bonding side and the opposite end of the negative electrode terminal 2 are tightened by a bolt and a nut (not shown). I have. Therefore, the positive electrode terminal 1 is electrically connected to the positive electrode plate 5 via the aluminum plate 3, and the negative electrode terminal 2 is electrically connected to the negative electrode plate 6 via the copper plate 4.

As shown in FIG. 3 and FIG. 4, a safety valve 9 is welded to the battery lid 8 as a thin-film circular fragile portion formed by welding stainless steel foil. The lower part of the safety valve 9 has a “1” character shape (long shape) and a size of 2 mm × 2 mm.
Both ends of the anti-blocking member 10 made of stainless steel and having a size of 25 mm are fixed to the bottom surface of the battery cover 8 and arranged. As shown in FIG. 3, the safety valve 9 is disposed immediately above the blockage preventing member 10 and the copper plate 4, and the blockage preventing member 10 and the copper plate 4 are electrically insulated. As shown in FIG. 4, the blockage preventing member 10 and the copper plate 4 are in a twisted positional relationship, and are arranged so that their respective longitudinal directions intersect.

As shown in FIG. 2, a liquid inlet 11 is formed in the battery lid 8, and in the rectangular nonaqueous electrolyte battery 20 of this embodiment, ethylene carbonate and dimethyl An electrolyte solution in which lithium hexafluorophosphate (LiPF ₆ ) is dissolved in a mixed solvent with carbonate is injected, and after the injection of the electrolyte solution, an injection port 11 is inserted by a liquid port stopper (not shown).
Is sealed.

As shown in FIG. 1, the battery module 30 includes a rectangular non-aqueous electrolyte battery 20 and an elongated control circuit 12 for controlling the module (the entire rectangular non-aqueous electrolyte battery 20). A thickness of 2 mm to prevent the rectangular nonaqueous electrolyte battery 20 from coming into contact with the control circuit 12 and to prevent the released gas from directly hitting the control circuit 12 when the safety valve 9 is opened and gas is released. And a control circuit protection member 1 made of a flame-retardant ABS resin having substantially the same width as the width of the control circuit 12.
The control circuit 12 is fixed to the upper surface of the battery cover 8 of each of the rectangular nonaqueous electrolyte batteries 20 via the control circuit protection member 13. In addition, the battery module 30 is combined so that the safety valves 9 of each square nonaqueous electrolyte battery 20 are arranged in a line in parallel with the control circuit 12, and the control circuit 12 is connected to the safety valve 9 of each square nonaqueous electrolyte battery 20. The safety valve 9 is disposed at a position that does not become the position directly above and separated from each safety valve 9.

Next, the prismatic nonaqueous electrolyte battery 2 of the present embodiment
The operation of the battery module 30 will be described.

In the rectangular non-aqueous electrolyte battery 20, the safety valve 9 is disposed immediately above the blockage preventing member 10 and the copper plate 4 intersecting each other in the longitudinal direction.
When the internal pressure of the safety valve 9 is opened due to an increase in internal pressure of 0, even if the contents of the electrode group (positive electrode active material, negative electrode active material, etc.) move in the direction of the safety valve 9 together with the gas, the intersecting blocking prevention member 1
Therefore, the safety valve 9 is not closed by being abutted and locked to the copper plate 4. Accordingly, the gas inside the rectangular non-aqueous electrolyte battery 20 is reliably discharged to the outside from the safety valve 9, so that the rectangular non-aqueous electrolyte battery 20 is not damaged. Also,
The aluminum plate 3 and the copper plate 4 are made of the same material (aluminum and copper, respectively) as the current collectors of the positive electrode plate 5 and the negative electrode plate 6, respectively, so that they are not sacrificed by electric corrosion and are not weakened.
Therefore, the strength can be maintained even when the contents of the electrode group move in the direction of the safety valve 9 together with the gas. Further, since the blockage preventing member 10 is insulated from the copper plate 4, there is no possibility of causing an external short circuit.

On the other hand, the battery module 30
Since 2 is arranged in the space that has become the dead space of each of the rectangular nonaqueous electrolyte batteries 20, a battery module having a high energy density can be obtained. Further, since the control circuit 12 is disposed at a position apart from the position of the safety valve 9, the safety valve 9 is not blocked from the outside when the safety valve 9 is ruptured. Can be avoided. Further, the control circuit protection member 13 is made of flame-retardant AB
Since the S resin is used, even when a plurality of safety valves 9 are arranged on the battery lid 8 of each square nonaqueous electrolyte battery 20, the control circuit 12 is prevented from directly contacting the battery lid 8. Therefore, even when the safety valve 9 is disposed below the control circuit 12 by accident through the flame-retardant ABS resin and the safety valve 9 is opened, the released gas does not directly hit the control circuit 12, so that the function of the control circuit 12 can be maintained. The control circuit protection member 13 does not ignite.

In this embodiment, an example is described in which the blocking valve 10 that is electrically independent from the copper plate 4 is provided in order to prevent the blocking of the safety valve 9 at the time of cleavage. Need not be particularly provided. That is, as shown in FIGS. 5 and 6, the prismatic nonaqueous electrolyte battery 21
It does not have the blockage prevention member 10, and the copper plate 4 locks the contents of the electrode group when the safety valve 9 is opened so as not to block. In this rectangular nonaqueous electrolyte battery 21, the copper plate 4 is used as a conductive member from the negative electrode plate 6 to the negative electrode terminal 1, and the safety valve 9 is prevented from being closed.
The number of parts can be reduced as compared with the prismatic nonaqueous electrolyte battery 20.

[Examples] Next, examples of the prismatic nonaqueous electrolyte batteries 20 (21) and the battery module 30 manufactured according to the above embodiment will be described. In addition, in order to confirm the effect of the example, the battery of the comparative example manufactured at the same time is also described.

(Embodiment 1) The same as the above-described square nonaqueous electrolyte battery 20, and as shown in FIG. 2, a safety valve 9 is arranged on the negative electrode terminal 2 side, and the safety valve 9 is a blockage prevention member 10 and a copper plate 4. Batteries located directly above each.

(Embodiment 2) In FIG. 2, only the battery cover 8 is rotated by 180 degrees in the horizontal direction, and the safety valve 9 is
And a battery manufactured in the same manner as in Example 1 except that the safety valve 9 was located immediately above each of the blockage preventing member 10 and the aluminum plate 3.

(Embodiment 3) In FIG. 2, two safety valves 9 are provided, one on each of the positive electrode terminal 1 side and the negative electrode terminal 2 side.
Example 1 except that it was arranged directly above the copper plate 4
A battery prepared in the same manner as in Example 1.

(Embodiment 4) The same as the above-described square nonaqueous electrolyte battery 21, and as shown in FIG. 5, the copper plate 4 is used as a conductive member and a blocking prevention member, and the safety valve 9 is disposed immediately above the copper plate 4. A battery produced in the same manner as in Example 1 except that the above procedure was performed.

(Embodiment 5) In FIG. 1, eight rectangular non-aqueous electrolyte batteries 20 (cells) of Embodiment 1 are combined, the position of the safety valve 9 of each cell is set to one row, and the control circuit 12 A battery module which is disposed at a position not directly above 9 and does not include the control circuit protection member 13 (the control circuit 12 and each battery cover 8 are in direct contact).

(Embodiment 6) Referring to FIG.
Eight rectangular non-aqueous electrolyte batteries in which the safety valve 9 is disposed on the positive terminal side and the negative terminal side respectively are combined, and one of the two safety valves 9 has the control circuit 12 disposed directly above and the control circuit protection member 13. Battery module not equipped.

(Embodiment 7) In FIG. 1, the safety valve 9 of the embodiment 3 is a combination of eight rectangular non-aqueous electrolyte batteries disposed on the positive terminal side and the negative terminal side, respectively. Is a battery module produced in the same manner as in Example 6, except that the control circuit 12 is disposed immediately above and the control circuit protection member 13 is provided.

Comparative Example 1 The positive electrode terminal 5 and the negative electrode terminal 6 were directly connected to the positive electrode terminal 1 and the negative electrode terminal 2 from the positive electrode plate 5 and the negative electrode plate 6 in the electrode group without using the aluminum plate 3 and the copper plate 4 shown in FIG. A battery produced in the same manner as in Example 4 except that the battery was made conductive.

<Test / Evaluation> [Test] Next, an external short-circuit test was performed on each battery and each battery module of the examples and comparative examples manufactured as described above. In this external short-circuit test, for the battery module, all eight cells were not externally short-circuited at the same time.
The test was performed by external short-circuiting one by one. As an inspection method of the cell, after the external short-circuit test, it is checked whether there is damage or ignition, and as an inspection method of the control circuit 12, after the external short-circuit test of each cell, the control circuit 12 is visually observed and the operation is confirmed.
We checked for malfunctions and inoperability.

[Test Results] Table 1 shows the test results after the external short-circuit test. In Table 1, “○” indicates 80% or more of no damage / ignition, and “△” indicates 50% or more and less than 80% of damage / ignition.
No ignition, "x" indicates less than 50% damage / no ignition, "-"
Indicates no evaluation because the control circuit 12 is not provided, “●” indicates that the operation of the control circuit 12 is normal, and “◆” indicates that the control circuit 12 is damaged and / or malfunctions and / or becomes inoperable. .

[0033]

[Table 1]

[Evaluation] As a result of the cell inspection, 50% or more of the batteries of Comparative Example 1 were damaged or ignited. In the battery of Example 2, 50% or more did not damage or ignite, and the safety of the unit cell was improved. More than 80% of the batteries of Examples 1, 3 to 7 do not damage or ignite, and the safety is further enhanced.

As a result of the control circuit inspection, the control module 12 of the battery module of Example 6 was damaged, malfunctioned or disabled, and the function of the control circuit 12 could not be performed. In the battery modules of Examples 5 and 7, the control circuit 12 operated normally even after the external short-circuit test of the cell.

Accordingly, in the unit cell, the member (the aluminum plate 3) having a function of preventing the safety valve 9 from being closed when the cell is opened.
And / or the provision of the copper plate 4 and / or the blocking prevention member 10) improves the safety. Further, by disposing the safety valve 9 on the negative electrode terminal 2 side from the center of the upper surface of the battery,
It can be seen that the safety is further improved. In the battery module in which a plurality of cells are combined, the safety valve 9 is arranged at a position where there is no control circuit 12 directly above. When the control circuit 12 is arranged just above the safety valve 9, By providing the control circuit protection member 13 between the battery and the control circuit 12, the control circuit 12 can be normally operated without being damaged, malfunctioning or inoperable,
It can be seen that safety can be improved.

In this embodiment, an example in which a stainless steel thin film is used as the safety valve 9 has been described. However, the safety valve 9 is not limited to the thin film, but is formed on the upper surface of the battery cover 8 and is more fragile than the battery cover 8. A member that cleaves at a predetermined battery internal pressure can be used.

In the present embodiment, the blockage preventing member 10
Although stainless steel is used, other metals, heat-resistant resins, flame-retardant resins and the like may be used.

Further, in this embodiment, the flame-retardant ABS resin is used for the control circuit protection member 13. However, as the material of the control circuit protection member 13, a metal, another heat-resistant resin or a flame-retardant resin is also used. It is possible. The control circuit protection member 13
When a metal is used, it is preferable to consider the shape of the control circuit protection member 13 so as not to come into contact with a metal part in the control circuit 12.

It is needless to say that the present invention is not limited to the above-described embodiment, but can adopt various other configurations without departing from the gist of the present invention.

[0041]

As described above, according to the first aspect of the present invention, the blockage preventing member is arranged inside the battery case,
Since the fragile portion is formed immediately above, when the fragile portion is split due to an increase in the internal pressure of the battery, the contents of the battery due to gas release are locked by the blocking prevention member, and the clogged portion of the fragile portion that has been split is prevented from being blocked. The effect that the internally generated gas can be released can be obtained. According to the second aspect of the present invention, each square non-aqueous electrolyte battery is provided on at least one of the upper surfaces of the battery cases other than immediately above at least one fragile portion formed on the upper surface of each battery case. In addition, since a control circuit for controlling the entire rectangular non-aqueous electrolyte battery is disposed, not only can dead space be effectively used, but also a route for reliably releasing gas generated when a battery is abnormal can be secured, and generated gas can be secured. Is not directly injected from directly below the control circuit, so that the risk of destroying the normally operating control circuit or leading to an uncontrollable state can be avoided.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a battery module to which the present invention is applied.

FIG. 2 is a partially cutaway front view of a prismatic nonaqueous electrolyte battery constituting the battery module of the embodiment.

FIG. 3 is an enlarged side sectional view of the vicinity of a safety valve of a rectangular nonaqueous electrolyte battery.

FIG. 4 is an enlarged view of the vicinity of the safety valve of the rectangular nonaqueous electrolyte battery when viewed from the electrode group side.

FIG. 5 is a partially cutaway front view of a prismatic nonaqueous electrolyte battery according to another embodiment to which the present invention is applied.

FIG. 6 is an enlarged view of the vicinity of a safety valve of a rectangular nonaqueous electrolyte battery according to another embodiment when viewed from an electrode group side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode terminal 2 Negative electrode terminal 3 Aluminum plate (part of blockage prevention member) 4 Copper plate (part of conductive member and blockage prevention member) 5 Positive electrode plate 6 Negative plate 7 Battery can (part of square battery case) 8 Battery cover (Part of prismatic battery case) 9 Safety valve (fragile part) 10 Blockage prevention member 12 Control circuit 13 Control circuit protection member 20, 21 Prismatic nonaqueous electrolyte battery 30 Battery module

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H012 AA07 BB02 DD01 EE04 FF01 GG01 JJ02 5H025 AA08 CC01 CC22 CC24 CC35 MM07 5H029 AJ12 AM03 AM05 AM07 BJ06 BJ27 DJ02 DJ05 EJ01 EJ14 HJ12 5H030 AA07 AS06 DD20

Claims (9)

[Claims] 1. An electrode group comprising a positive electrode plate, a negative electrode plate and a separator laminated therein and housed in a rectangular battery case, and a positive electrode and a negative electrode terminal conductive from the electrode group and fixed to the upper surface of the battery case. In the prismatic nonaqueous electrolyte battery, the battery case has a fragile portion that is cleaved at a predetermined internal pressure, and at least one of the fragile portions is formed on the upper surface of the battery case, and the fragile portion formed on the upper surface of the battery case. At least one of which is formed immediately above a blocking prevention member which is arranged inside the battery case and prevents blocking of the fragile portion when the fragile portion is torn. . 2. The blocking prevention member according to claim 1, wherein one end is connected to a negative electrode plate in the electrode group, and the other end is a long conductive member connected to the negative electrode terminal. 5. The square nonaqueous electrolyte battery according to 1. 3. The rectangular nonaqueous electrolyte battery according to claim 2, wherein the blocking prevention member is made of the same material as the current collector of the negative electrode plate. 4. The rectangular nonaqueous electrolyte battery according to claim 1, wherein the blocking prevention member is a member that is electrically independent of a member that conducts the electrode group and the negative electrode terminal. 5. An elongate conductive member having one end connected to the negative electrode plate of the electrode group and the other end connected to the negative electrode terminal, the blocking prevention member being located immediately above the conductive member and directly below the fragile portion. To
The rectangular nonaqueous electrolyte battery according to claim 1, wherein the conductive member is insulated from the conductive member, and is formed of a long member disposed at a position twisted with respect to a longitudinal direction of the conductive member. 6. A battery module comprising the rectangular non-aqueous electrolyte battery according to claim 1. 7. A battery module comprising a combination of a plurality of rectangular non-aqueous electrolyte batteries, and a control circuit for controlling each of the rectangular non-aqueous electrolyte batteries and the entire rectangular non-aqueous electrolyte battery, The liquid battery has a positive electrode plate, a negative electrode plate, and an electrode group housed in a prismatic battery case by laminating a separator,
A positive electrode and a negative electrode terminal that are conductive from the electrode group and are fixed to the upper surface of the battery case, wherein the battery case has a fragile portion that is cleaved at a predetermined internal pressure, and at least one of the fragile portions is the battery case. The control circuit is formed on an upper surface, and the control circuit is disposed on at least one of the upper surfaces of the battery cases other than immediately above the at least one fragile portion formed on the upper surface of each of the battery cases. Battery module. 8. The battery module according to claim 7, wherein the control circuit is fixed to at least one of the upper surfaces of the respective battery cases via a control circuit protection member that protects the control circuit. . 9. The battery module according to claim 8, wherein the control circuit protection member is a flame-retardant ABS resin.