WO2020175019A1

WO2020175019A1 - Battery module and battery unit

Info

Publication number: WO2020175019A1
Application number: PCT/JP2020/003877
Authority: WO
Inventors: 中島　武
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2019-02-26
Filing date: 2020-02-03
Publication date: 2020-09-03
Also published as: JP2020136253A; JP7236653B2

Abstract

A first battery cell 100a, a fifth battery cell 100e, and an eighth battery cell 100h are included in a third battery module 200c. An inner housing 110 houses the first battery cell 100a, the fifth battery cell 100e, and the eighth battery cell 100h. The inner housing 110 is provided with, on a first inner surface 120a facing the eighth battery cell 100h, an inner recess 130 having a shape recessed to the inside of the inner housing 110. Each of the first battery cell 100a, the fifth battery cell 100e, and the eighth battery cell 100h contains a positive plate and a negative plate. The inner recess 130 is disposed at a position where the positive plate and the negative plate of the eighth battery cell 100h can be short-circuited by a conductor 400 when the conductor 400 is inserted inward from the first inner surface 120a.

Description

\¥0 2020/175019 1 卩 (: 17 2020 /003877 Clarification

Title of invention: Battery module, battery unit

Technical field

The present disclosure relates to a battery module and a battery unit, and more particularly to a battery module and a battery unit that house a plurality of battery cells.

Background technology

A battery cell such as a lithium-ion secondary battery includes an insulating layer between a positive electrode plate and a negative electrode plate, which electrically insulates each electrode plate and holds an electrolytic solution. Conductor powder (foreign matter) adhering to the surfaces of the positive electrode plate, the negative electrode plate, and the insulating layer breaks the insulating layer, and the positive electrode plate and the negative electrode plate are electrically connected, causing an internal short circuit. Once an internal short circuit occurs, the battery cells may be destroyed by the Joule heat associated with the short circuit current. On the other hand, even if an internal short circuit occurs in a battery cell, in order to ensure the safety of the battery cell, it is important to correctly evaluate the safety of the battery cell when an internal short circuit occurs. An example of the evaluation test is a nail penetration test. In the nail penetration test, a nail is pierced into the battery cell from the outside, the positive electrode plate and the negative electrode plate are short-circuited by the nail, and changes in the temperature and voltage of the battery cell caused by the generated Joule heat are measured (for example, the specifications Reference 1).

Prior art documents

Patent literature

[0003] Patent Document 1: International Publication No. 12/1 1 7 6 6 0

Summary of the invention

Problems to be Solved by the Invention

[0004] In the nail penetration test, the nail must be pierced at a position where an internal short circuit occurs. On the other hand, a battery module is constructed by housing a plurality of battery cells in a housing. In addition, a battery unit is configured by further housing a plurality of battery modules in another housing. Such a battery unit or \¥02020/175019 2 卩 (: 171?2020/003877

In the battery module, the battery cell is not exposed to the outside. Therefore, it becomes difficult to pierce the nail at the position where the internal short circuit occurs.

[0005] The present disclosure has been made in view of such circumstances, and an object thereof is to provide a technique that facilitates an internal short circuit of a battery cell even in a structure in which a plurality of battery cells are housed.

Means for solving the problem

[0006] In order to solve the above problems, a battery module according to an aspect of the present disclosure includes a plurality of battery cells and a housing that houses the plurality of battery cells. The housing has a concave portion that is concave toward the inside, on the surface facing at least one battery cell. Each of the plurality of battery cells has a positive electrode plate and a negative electrode plate built-in, and the recess has a positive electrode plate and a negative electrode plate of at least one battery cell when an object is inserted from the surface toward the inside of the housing. Is placed at a position where an object can be short-circuited. [0007] Another aspect of the present disclosure is a battery unit. This battery unit includes a plurality of battery modules and an outer housing that houses the plurality of battery modules. Each of the plurality of battery modules includes a plurality of battery cells and an inner housing that houses the plurality of battery cells. The outer casing has an outer recess facing the at least one battery cell and having an inner recess. Each of the plurality of battery cells incorporates a positive electrode plate and a negative electrode plate, and the outer recess has at least 1 through the inner casing when an object is squeezed from the outer surface toward the inside of the outer casing. The positive electrode plate and the negative electrode plate of the two battery cells are arranged at positions where an object can short-circuit them.

Effect of the invention

[0008] According to the present disclosure, even in a structure in which a plurality of battery cells are housed, the battery cells can be easily short-circuited internally.

Brief description of the drawings

[0009] [Fig. 1] Fig. 1 (8)-(!○) is a diagram showing a structure of a battery cell according to the present embodiment.

[Fig. 2] Fig. 2 (3)-(匕) includes multiple battery cells of Fig. 1 ( ₃ )-(Imperial). \¥02020/175019 3 卩 (: 171?2020/003877

It is a figure which shows the structure of a battery module and a battery unit.

FIG. 3 is a diagram showing the structure of the battery unit according to the present embodiment.

[Fig. 4] Fig. 4 ( ₃ )-(匕) shows the structure of the outer and inner recesses in Fig. 3.

FIG. 5 is a side view showing the structure of a battery module according to a modification.

MODE FOR CARRYING OUT THE INVENTION

[0010] Before specifically describing the embodiment of the present disclosure, an outline of the embodiment will be described. This example relates to a battery unit. Multiple battery modules are stored in the battery unit housing (hereinafter referred to as "outer housing"), and multiple battery cells are stored in each battery module housing (hereinafter referred to as "inner housing"). To be done. When the battery cell is a lithium ion secondary battery, an internal short circuit may occur between the positive electrode plate and the negative electrode plate due to destruction of the insulating layer by the conductor powder or contraction of the insulating layer at high temperature. When an internal short circuit occurs between the positive electrode plate and the negative electrode plate, the short circuit part may further expand and abnormal heating may occur due to the Joule heat associated with the short circuit current, and the battery cell may be destroyed. On the other hand, even if an internal short circuit occurs in a battery cell, it is important to prevent damage to the battery cell and ensure safety. In order to ensure the safety of battery cells, it is necessary to correctly evaluate the safety of batteries when an internal short circuit occurs. Therefore, for lithium-ion secondary batteries, behavioral evaluation at the time of internal short circuit has been established by the standards such as 11 1_, "13, 3 Hachimi standard. Various methods have been proposed as a method for evaluating the behavior at the time of an internal short circuit.

”2 646 describes the evaluation by the nailing test.

[001 1] As described above, in the nail penetration test, a nail is pierced into the battery from the outside, the positive electrode plate and the negative electrode plate are short-circuited by the nail, and changes in the battery temperature and voltage caused by the generated Joule heat are measured. It At that time, if the nail is pierced at a position where the internal short circuit does not occur, the accurate nail piercing test cannot be performed. Therefore, it is important to pierce the nail at the position where the internal short circuit occurs. On the other hand, in the battery unit, multiple battery cells are stored inside the outer and inner casings, \¥02020/175019 4 卩 (: 171?2020/003877

Since the pond cell is not exposed to the outside, it becomes difficult to pierce the nail at a position that causes an internal short circuit. Furthermore, as the capacity of the battery module or battery unit increases, the size of the battery cells will increase or the number of batteries will increase. In this case, the influence of the destroyed battery cell on the adjacent battery cell is more important than before, so it is desirable to evaluate in the final form.

[0012]In order to facilitate internal short-circuiting of the battery cells even in a structure in which a plurality of battery cells are housed, in this embodiment, a position where an internal short-circuit occurs in the battery cells (hereinafter referred to as "short-circuit position") is set. , Suppose that a virtual nail extending straight is stabbed. At the position where the virtual nail and the surface of the inner casing that houses the battery cell (hereinafter referred to as the “inner surface”) intersect, an inner concave portion that is recessed toward the inside of the inner casing is formed. It is provided. In addition, an outer concave portion that is recessed toward the inside of the outer casing is provided at a position where the virtual nail and the surface of the outer casing (hereinafter referred to as “outer surface”) intersect. When performing the nail penetration test, if the nail is pierced from the outer recess, the nail penetrates the outer recess and the inner recess to reach the short-circuited position of the battery cell. Furthermore, even if the angle of the nail pierced from the outer recess is not toward the short-circuit position, the inner recess corrects the angle of the nail so that the nail moves toward the short-circuit position. In the following description, “parallel” and “vertical” include not only perfect parallel and vertical but also parallel and deviation from vertical within the error range. Further, “abbreviation” means that they are almost the same.

[0013] Fig. 1 (8)-() shows the structure of the battery cell 100. Figure 1 (8) is an external view of the battery cell 100. The battery cell 100 includes a first surface 10, a second surface 12, a third surface 14, a positive electrode terminal 16 and a negative electrode terminal 18. The battery cell 100 has a cylindrical shape, its upper surface is a circular first surface 10 and its side surface is a second surface 12 and its lower surface is a circular third surface 14 .. Here, a combination of the first surface 10, the second surface 12 and the third surface 14 constitutes a case, and the case is made of steel, for example. A positive electrode terminal 16 protruding upward is arranged in the central portion of the first surface 10. The third surface 14 is also the negative electrode terminal 18. \¥02020/175019 5 卩 (: 171?2020/003877

[0014] FIG. 1 (distance) shows the battery cells 10 in the direction perpendicular to the first surface 10 and the third surface 14

It is a sectional view of 0. The battery cell 100 has a positive electrode plate 50, a separator 60, and a negative electrode plate 70 built therein, and the positive electrode plate 50, the separator 60, and the negative electrode plate 70 have a spiral structure wound in a spiral shape. For example, the positive electrode plate 50 uses lithium cobalt oxide as the main active material, and the negative electrode plate 70 uses special force carbon as the main active material. The separator 60 is an insulating layer impregnated with an electrolytic solution. In such a structure, the short circuit position is a position that crosses the separator 60 and includes the positive electrode plate 50 and the negative electrode plate 70, and is indicated as position 1, for example.

[0015] Assuming that a nail is pierced from the first surface 10 on which the positive electrode terminal 16 is provided, the position where position 1 is linearly moved toward the first surface 10 is the first surface 10 Shown as position 2 above. During the nail penetration test, the nail reaches position 1 when it is applied to position 2 on surface 1 10 and the nail is advanced toward surface 3 14. However, the direction in which the nail is stuck is not limited to the first surface 10 on which the positive electrode terminal 16 is provided, and may be the third surface 14 on which the negative electrode terminal 18 is provided, or the second surface. May be 1 2. In the following, as an example, as shown in FIG. 1 (匕), the description will be made on the assumption that the nail is pierced from the first surface 10 on which the positive electrode terminal 16 is provided. Also, the short-circuit position is not limited to position 1, and it is not the position where it goes from the center part of the 1st surface 10 to the 3rd surface 14 and the position where it goes from the peripheral part to the 3rd surface 14. It should be

[0016] Fig. 2 (a)-(匕) shows a battery module 2 including a plurality of battery cells 100.

The structure of the battery unit 300 is shown below. As shown in FIGS. 2(a) and 2(b), an orthogonal coordinate system including the X axis, the / axis, and the horizontal axis is defined. The X axis and V axis are orthogonal to each other in the bottom surface of the battery module 200 and the battery unit 300. The axis is perpendicular to the X axis and the axis, and extends in the height (vertical) direction of the battery module 200 and the battery unit 300. Further, the positive directions of the X axis, the S axis, and the X axis are defined by the directions of the arrows in FIG. 1, and the negative directions are defined by the directions opposite to the arrows. Also, the positive side of the X-axis is "front side", the negative side of the X-axis is "rear side", the positive side of the 2-axis is "upper side" or "top side", 2-axis \\02020/175019 6 卩(: 171?2020/003877

The negative side of is sometimes referred to as the “lower side” or the “bottom side”. Furthermore, the positive side of the V axis is sometimes referred to as the "right side" and the negative side of the V axis is sometimes referred to as the "left side".

[0017] Fig. 2 (8) shows the structure of the cross section of the saw plane at a position close to the front end of the battery module 200 as seen from the front side. As shown in the figure, the battery module 200 includes first battery cell 1 0 0 3 to 1 1 1 battery cell 1 0 0 !<, and an inner housing 1 1 0, which are collectively referred to as battery cell 1 0 0. The number of battery cells 100 included in the battery module 200 is not limited to “1 1 ”. Further, the inner casing 110 has a hollow box shape that is long in the front-rear direction, and is formed by the first inner surface 1 2 0 3 to the sixth inner surface 1 2 0 which are collectively referred to as the inner surface 1 20. Be surrounded. In FIG. 2 (a), the first inner surface 1 2 0 ₃ second inner surface 1 2 0 spoon is omitted.

[0018] Specifically, the third inner surface 1 200 is arranged on the upper side of the inner housing 110, the fourth inner surface 120 is arranged on the lower side, and the third inner surface 1 20 is arranged on the lower side. 5 The inner surface 1206 is arranged, and the sixth inner surface 1250 is arranged on the right side. Furthermore, the first inner surface 1 2_Rei ₃ is disposed on the front side of the inner casing 1 1 〇, the rear is disposed a second inner surface 1 2 0 spoon. The first inner surface 1 2 0 ₃ to the sixth inner surface 1 2 0 ₃ are all rectangular. In particular, the two opposing inner surfaces 120 have the same shape. The shapes of the inner casing 110 and the inner surface 120 are not limited to this.

Inside the inner housing 110, a plurality of battery cells 100 are stored. Here, a plurality of battery cells 100 are arranged with the first surface 10 facing the front side. At that time, the first surface 10 of the battery cell 100 and the first inner surface 1230 are separated from each other by a predetermined distance. A wiring for connecting a plurality of battery cells 100 and a circuit for executing control for a plurality of battery cells 100 are also included in the battery module 200, but their illustration is omitted here.

[0020] Fig. 2 (匕) shows the structure of the cross section of the plane at the position near the leftmost end of the battery unit 300 as viewed from the left side. As shown in the figure, the battery unit 300 includes a first battery module 200 3 to a third battery module 200 0 0, which are collectively referred to as a battery module 200 0, and an outer housing 210. Battery unit 30 \¥02020/175019 7 卩(: 171?2020/003877

The number of battery modules 200 included in 0 is not limited to “3”. Here, as an example, since three battery modules 200 are stacked vertically, the outer housing 210 has a hollow box shape that is long in the vertical direction, and is collectively referred to as the outer surface 220. It is surrounded by the first outer surface 2203 to the sixth outer surface 220. Figure in 2 (b), and the fifth outer surface 2 2 0 ₆ 6 outer surface 2 2 0 interference is omitted.

[0021] Specifically, the front side of the outer casing 2 1 0 is disposed first outer surface 2 2 0 _3, the rear side is arranged a second outer surface 2 2 0 6, the upper side The third outer surface 220 0 is arranged, and the fourth outer surface 220 is arranged on the lower side. In addition, the left side of the outer casing 2 1 0 is placed fifth outer surface 2 2 0 _6, the right side is disposed the sixth outer surface 2 2 0 Ji. In particular, the two opposing outer surfaces 220 have the same shape. The shapes of the outer housing 210 and the outer surface 220 are not limited to this.

A plurality of battery modules 20 0 are housed inside the outer housing 210.

At that time, the first inner surface 1 2 0 ₃ of the battery module 2 0 0, the first outer surface 2 2 0 _3, are spaced apart by a predetermined distance. The battery unit 300 also includes wiring for connecting a plurality of battery modules 200, and a circuit for executing control of the plurality of battery modules 200, but illustration thereof is omitted here. To do.

As described above, a plurality of battery cells 100 are housed inside the inner housing 110 of the battery module 200, but when the battery unit 300 is viewed from the outside. In addition, multiple battery cells 100 are not exposed. Furthermore, since the first surface 10 and the first inner surface 1 2 0 3 of the battery cell 100 are separated from each other, and the first inner surface 1 2 0 3 and the first outer surface 2 2 0 3 are also separated from each other, The first surface 10 of the battery cell 100 is arranged apart from the first outer surface 2203. Combining these situations, when performing a nail penetration test on at least one of the multiple battery cells 100 housed in the battery unit 300, the nails are removed from the first outer surface 2203. It can be said that the nail is unlikely to reach the position 2 on the first surface 10 in Fig. 1 (slung) even if it is stabbed. This \¥02020/175019 8 卩 (: 171?2020/003877

In order to improve the possibility of the above, the battery module 200 and the battery unit 300 according to the present embodiment further have the following structure.

[0024] FIG. 3 shows the structure of the battery unit 300. this is,

It is a sectional view of a plane. Here, the difference from the above will be mainly described. As an example, the 8th battery cell 100 in the 3rd battery module 2000 at the bottom is subject to the nail penetration test. As shown in FIG. 2 (^ ), the eighth battery cell 10011 is the battery cell 100 arranged at the lowermost stage and at the left end. As shown in the figure, position 1 and position 2 of the eighth battery cell 100 are arranged in the front-rear direction, and position 2 is arranged on the first surface 10 of the eighth battery cell 100.

[0025] The first inner surface 1203 of the inner casing 110 is provided with an inner concave portion 1300 that is recessed toward the inside of the inner casing 110. The inner recessed portion 130 is arranged in a portion of the first inner surface 1230 facing the first surface 10 of the eighth battery cell 100. In particular, the inner recessed portion 130 is arranged at a position where the position 1 and the position 2 are aligned in the front-rear direction. Further, the first outer surface 22 of the outer casing 210 is provided with an outer concave portion 230 which is recessed toward the inside of the outer casing 210. Outer recess 2 3 0, distribution to the eighth battery cell Le 1 0 0 II first surface 1 0 in a portion opposed to each other with the first inner surface 1 2 0 ₃ of the first outer surface 2 2 0 ₃ Placed. In particular, the outer concave portion 230 is arranged at a position aligned with the position 1, the position 2, and the inner concave portion 130 in the front-rear direction.

In FIG. 3, the above-mentioned nails or virtual nails are shown as conductors 400. Under this definition, the outer recess 2 3 0, when the first outer surface 2 2 0 ₃ toward the inside of the outer casing 2 1 0揷入conductor 4 0 0, inside housing 1 1 0 It can be said that the positive electrode plate 50 and the negative electrode plate 70 of the eighth battery cell 100 are arranged at a position where they can be short-circuited by the conductor 400 through. In addition, the inner recessed portion 130 is squeezed with the conductor 400 from the inner recessed portion 130 toward the inside of the inner casing 1100, and is connected to the positive electrode plate 50 of the eighth battery cell 100. When the negative electrode plate 70 and the negative electrode plate 70 are short-circuited by the conductor 400, it can be said that they are arranged at positions where the conductor 400 is penetrated. For this reason, the nail piercing tester puts the tip of the conductor 400 on the outer concave portion 230 and attaches the conductor 400. \¥02020/175019 9 卩(: 171?2020/003877

Only by moving it to the rear side, the conductor 400 passes through the outer concave portion 230, the inner concave portion 130, and the position 2 to reach the position 1. As a result, the eighth battery cell 100 is short-circuited by the conductor 400.

[0027] On the other hand, when the moving direction of the conductor 400 which is provided with the tip in the outer concave portion 230 is deviated from the rear side, the conductor 400 does not pass through the inner concave portion 130 and the position 2. is there. In order to explain the structures of the outer concave portion 230 and the inner concave portion 130 to deal with this, FIGS. 4 (3)-(13) are used here. Fig. 4 (3)-(匕) shows the structure of the outer concave portion 230 and the inner concave portion 130. FIG. 4 ( ₃ ) is an enlarged cross-sectional view of the vicinity of the outer concave portion 230 of FIG. The outer recessed portion 230 includes a side surface 2 32 and a bottom surface 2 34. Side 2 3 2 has an opening of circular shape on the first outer surface 2 2 0 _3, a surface having a narrowing tape par shape toward the rear from the first outer surface 2 2 0 3. A circular bottom surface 2 3 4 is arranged at the rear end of the side surface 2 3 2. With such a structure, when the angle of the tip of the conductor 400 is not directed to the rear side, the tip of the conductor 400 touches the side surface 232. The conductor 400 contacting the side surface 2 3 2 moves toward the bottom surface 2 3 4 due to the inclination of the side surface 2 3 2. The conductor 400 reaching the bottom surface 2 3 4 penetrates the bottom surface 2 3 4 and moves to the inside of the outer housing 2 1 0. Therefore, the angle of the tip of the conductor 400 is corrected so as to face the rear side.

[0028] FIG. 4 (匕) is an enlarged cross-sectional view of the vicinity of the inner concave portion 130 of FIG. The inner concave portion 1300 includes a side surface 1 3 2 and a side surface 1 3 2. The side surface 1 3 2 and the bottom surface 1 3 4 have the same shape as the side surface 2 3 2 and the bottom surface 2 3 4. Here, the size of the side surface 1 3 2 and the bottom surface 1 3 4 may be the same as or different from the size of the side surface 2 3 2 and the bottom surface 2 3 4. Due to such a structure, if the direction of movement of the conductor 400 passing through the outer recess 230 is deviated from the rear side, the tip of the conductor 400 does not contact the bottom surface 1 3 4 but the side surface 1 3 2. To do. The conductor 400 contacting the side surface 1 3 2 moves toward the bottom surface 1 3 4 due to the inclination of the side surface 1 3 2. The conductor 400 reaching the bottom surface 1 3 4 penetrates the bottom surface 1 3 4 and moves to the inside of the inner housing 1 1 0. Return to FIG. As a result, conductor 400 passes through position 2 \¥02020/175019 10 卩(: 171?2020/003877

Reach 1

[0029] In the following, the battery cell 100 and the battery module 2 to be the targets of the nail penetration test

0 will be described. As shown in Fig. 2 (a), when multiple battery cells 100 are arranged in the inner housing 110, the number of adjacent battery cells 100 (hereinafter referred to as "number of adjacent cells") Is different for each battery cell 100. For example, the number of adjacent cells in the first battery cell 1003, the fourth battery cell 1000, the eighth battery cell 100, and the 11th battery cell 100 is "3". The number of neighbors in the second battery cell 100, the third battery cell 100 000, the ninth battery cell 100 000, and the 10th battery cell 100 ″ is “4”. The number of adjacent cells in the fifth battery cell 1006 and the seventh battery cell 1009 is "5". The number of adjacent cells in the sixth battery cell 100 is “6”.

As described above, the case of the battery cell 100 is made of steel. Further, it is assumed that the inner housing 110 is made of a material having lower thermal conductivity than metal such as steel, for example, resin. Under such circumstances, the heat generated in the battery cells 100 having a large number of adjacent cells is more likely to escape to the adjacent battery cells 100 than the heat generated in the battery cells 100 having a smaller number of adjacent cells. When the nail penetration test is performed on the sixth battery cell 100, the heat generated from the sixth battery cell 100 easily escapes, so the influence of the heat generation is reduced. On the other hand, when the nail penetration test is conducted on the eighth battery cell 100, the heat generated from the eighth battery cell 100 is difficult to escape, so that the influence of the heat generation is less likely to be reduced. Therefore, it can be said that a battery cell 100 with a smaller number of adjacent cells is more suitable for the nail penetration test. It can be said that this is more suitable as a target of the nail penetration test for battery cells 100, which have a wider area facing the inner housing 110.

[0031] Next, as shown in Fig. 2 (匕), a plurality of battery modules 2 are provided in the outer housing 210.

In a structure in which 0 0 is arranged in the vertical direction, it is assumed that one of the battery modules 20 0 is burned due to heat generation. Since the flame from the battery module 200 goes to the upper side, another battery module 200 0 arranged above the battery module 200 arranged below the battery module 200 0 concerned. But \¥02020/175019 11 卩 (: 171?2020/003877

Increases the possibility of burning. In other words, the lower the battery module 200 that burns due to heat generation, the greater the damage caused by burning. Therefore, it can be said that the battery module 200 arranged on the lower side is more suitable for the nail penetration test. In the structure shown in Fig. 2 (slung), the third battery module 2000 is most suitable for the nail penetration test.

[0032] The inner concave portion 130 and the outer concave portion 230 are provided so as to face the battery cell 100 of the battery module 200 thus selected. Further, the battery cell 100 that is the target of the nail penetration test does not have to be one, and may be a plurality. At that time, a plurality of inner concave portions 130 and a plurality of outer concave portions 230 are provided.

According to this embodiment, when the conductor 400 is inserted from the outer surface 220 to the inside, the outer recess 230 is arranged at a position where the battery cell 100 can be internally short-circuited. Therefore, even in a structure in which a plurality of battery cells 100 are stored, it is possible to easily short-circuit the battery cells 100 internally. Further, since the outer concave portion 230 includes the side surface 2322 and the bottom surface 2324, even if the direction of the tip of the conductor 400 is directed to the side surface 232. Can be modified to the bottom 2 3 4 side. Further, since the direction of the tip of the conductor 400 is corrected to the bottom surface 2 34, the battery cell 100 can be easily short-circuited internally.

[0034] Further, the conductor 400 is squeezed inward from the outer concave portion 230 to the inside of the battery cell.

Since the inner recess 1300 is arranged at the penetrating position of the conductor 4100 when the 10000 is short-circuited internally, the battery cell 1100 can be accommodated in the structure in which a plurality of battery cells 1100 are accommodated. Can be easily short-circuited. Further, since the inner recessed portion 130 includes the side surface 1 3 2 and the bottom surface 1 3 4, even if the direction of the tip of the conductor 4 0 0 faces the side surface 1 3 2, the direction of the tip of the conductor 4 0 0 Can be modified to the bottom 1 3 4. Further, since the direction of the tip of the conductor 400 is corrected to the bottom surface 1334, the battery cell 100 can be easily short-circuited internally.

[0035] Further, since the battery cell 100 having a small number of adjacent battery cells 100 is subjected to the nail penetration test, the inner recessed portion 1300 and the outer recessed portion 2300 are provided. \¥02020/175019 12 ((171?2020/003877

The accuracy can be improved. In addition, since the battery cell 100 included in the battery module 200 arranged on the lower side is targeted for the nail penetration test, the inner concave portion 1300 and the outer concave portion 2300 are provided, the accuracy of the test result can be improved. Can be improved.

[0036] An outline of one aspect of the present disclosure is as follows. A battery module 200 according to an aspect of the present disclosure includes a plurality of battery cells 100 and an inner housing 110 that houses the plurality of battery cells 100. The inner housing 110 has an inner surface 130 facing the at least one battery cell 100, and an inner recess 130 which is recessed toward the inside. Each of the plurality of battery cells 100 includes a positive electrode plate 50 and a negative electrode plate 70, and the inner recessed portion 130 is an object that faces from the inner surface 120 to the inside of the inner housing 1100. When at least one battery cell 100 is charged, the positive electrode plate 50 and the negative electrode plate 70 are arranged at a position where an object can short-circuit them.

[0037] The object is the conductor 400, and the inner recessed portion 130 is at least when the conductor 400 is squeezed from the inner surface 120 toward the inside of the inner casing 1100. Inside one battery cell 100, the positive electrode plate 50 and the negative electrode plate 70 of the battery cell 100 may be arranged at a position where they can be short-circuited by the conductor 400.

[0038] Another aspect of the present disclosure is a battery unit 300. This battery unit 300 includes a plurality of battery modules 200 and an outer housing 210 that houses the plurality of battery modules 200. Each of the plurality of battery modules 200 includes a plurality of battery cells 100 and an inner casing 1100 that houses the plurality of battery cells 100. The outer housing 210 includes an outer recess 230 which is recessed toward the inside on an outer surface 220 facing the at least one battery cell 100. Each of the plurality of battery cells 100 contains a positive electrode plate 50 and a negative electrode plate 70, and the outer concave portion 230 is an object extending from the outer surface 220 to the inside of the outer housing 210. In the case of inserting, the positive electrode plate 50 and the negative electrode plate 70 of at least one battery cell 100 are placed at a position where they can be short-circuited by an object through the inner housing 110.

[0039] The inner casing 1100 of the battery module 200 that houses at least one battery cell 100 has an inner surface 1 2 0 facing at least one battery cell 100. \¥02020/175019 13 卩 (: 171?2020/003877

In addition, an inner recessed portion 130 having a shape recessed toward the inside may be further provided. The inner side recessed part 130 squeezes an object from the outer side recessed part 230 to the inside of the inner housing 110, and the positive electrode plate 50 and the negative electrode plate 70 of at least one battery cell 100. When and are short-circuited by an object, they are placed at the position where the object penetrates.

[0040] The object is a conductor 400, and the outer recess 230 is an inner casing when the conductor 400 is squeezed from the outer surface 220 toward the inside of the outer recess 230. 1100, the positive electrode plate 50 and the negative electrode plate 70 of the battery cell 100 are arranged in the at least one battery cell 100 at a position where they can be short-circuited by the conductor 400. May be.

The present disclosure has been described above based on the embodiments. It should be understood by those skilled in the art that this embodiment is an exemplification, and that various modifications can be made to the combinations of the respective constituent elements or the respective processing processes, and that such modifications are also within the scope of the present disclosure. is there.

[0042] In the present embodiment, the inner surface 120 is provided with the inner recess 130, and the outer surface 220 is provided with the outer recess 230. However, the present invention is not limited to this, and for example, although the outer concave portion 230 is provided on the outer surface 220, the inner concave portion 130 may not be provided on the inner surface 120. According to this modification, the structure can be simplified.

In this example, the battery cell 100 included in the battery unit 300 is the target of the nail penetration test. However, not limited to this, for example, the battery cell 100 included in the battery module 200 may be the target of the nail penetration test. According to this modification, the applicable range of this embodiment can be expanded.

[0044] In the present embodiment, the inner concave portion 130 is formed from the inner surface 120 to the inner casing 1

It has a concave shape toward the inside of 10. However, without being limited to this, for example, the inner recessed portion 130 may have a tunnel shape that proceeds from the inner surface 120 to the inside of the inner housing 110. FIG. 5 shows the structure of the battery cell 100. As an example, the inner concave portion 130 is formed between the fourth battery cell 100 00!, the third battery cell 100 00, and the seventh battery cell 100 0 from the sixth inner surface 120. \¥02020/175019 14 卩 (: 171? 2020 /003877

It has a shape that goes toward the sixth battery cell 100 while bending. In this case, the conductor 400 is a bendable pointed tool. According to this modification, the degree of freedom in the configuration can be improved.

[0045] In this example, an internal short circuit is generated by piercing the battery cell 100 with a conductor 400 such as a nail. However, not limited to this, for example, by locally pressing the second surface 12 of the battery cell 100 with an object, even if the distance between the positive electrode plate 50 and the negative electrode plate 70 is narrowed and an internal short circuit occurs. Good. In that case, the object does not have to be the conductor 400 such as a nail, and may have a strength capable of penetrating the inner recess 130 or the outer recess 230. According to this modification, the degree of freedom in the configuration can be improved.

Industrial availability

[0046] According to the present disclosure, even in a structure in which a plurality of battery cells are housed, the battery cells can be easily short-circuited internally.

Explanation of symbols

[0047] 1 0 1st surface, 1 2 2nd surface, 1 4 3rd surface, 1 6 positive electrode terminal,

1 8 negative electrode terminal, 50 positive electrode plate, 60 separator, 70 negative electrode plate,

1 00 Battery cell, 1 1 0 Inner housing (housing), 1 20 Inner surface (surface), 1 30 Inner recess (recess), 1 32 Side, 1 34 Bottom,

200 battery module, 210 outer housing, 220 outer surface,

230 Outer recess, 232 side, 234 bottom, 300 battery unit, 400 conductor (object).

Claims

\¥0 2020/175019 15 卩(: 17 2020/003877 Claims

[Claim 1] A plurality of battery cells,

A casing for accommodating the plurality of battery cells, wherein the casing has a concave portion that is recessed toward the inside, on a surface facing at least one battery cell,

Each of the plurality of battery cells includes a positive electrode plate and a negative electrode plate, and the recessed portion of the at least one battery cell is used when an object is inserted from the surface toward the inside of the housing. The positive electrode plate and the negative electrode plate are arranged at a position where the object can short-circuit them,

Battery module.

[Claim 2] The object is a conductor,

When the conductor is inserted from the surface toward the inside of the housing, the recess can short-circuit the positive electrode plate and the negative electrode plate of the battery cell by the conductor inside the at least one battery cell. Are placed in various positions,

The battery module according to claim 1.

[Claim 3] a plurality of battery modules,

An outer housing that houses the plurality of battery modules, each of the plurality of battery modules,

Multiple battery cells,

An inner housing that houses the plurality of battery cells,

The outer casing comprises an outer recess facing the at least one battery cell, the outer recess having a shape recessed inward.

Each of the plurality of battery cells incorporates a positive electrode plate and a negative electrode plate, and the outer recess defines the inner casing when an object is rubbed from the outer surface toward the inside of the outer casing. Via, the positive electrode plate and the negative electrode plate of the at least one battery cell are arranged in a position where they can be short-circuited by the object, \¥02020/175019 16 卩 (: 171?2020/003877

Battery unit.

[Claim 4] The above-mentioned inner casing of the battery module that houses the at least one battery cell further has an inner concave portion that is recessed toward the inside, on an inner surface facing the at least one battery cell. Prepare,

The inner recess is configured to squeeze the object from the outer recess toward the inside of the inner casing to short-circuit the positive electrode plate and the negative electrode plate of the at least one battery cell with the object. Is placed at the position where the

The battery unit according to claim 3.

[Claim 5] The object is a conductor,

When the conductor is squeezed from the outer surface toward the inside of the outer casing, the outer recess has a positive electrode of the battery cell inside the at least one battery cell via the inner casing. A plate and a negative electrode plate are arranged at a position where they can be short-circuited by the object.

The battery unit according to claim 3 or 4.