JP2018073518A - Secondary battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve productivity of a secondary battery module. A secondary battery module configured by stacking a plurality of secondary batteries each having a battery unit, a top connection terminal, a bottom connection terminal, and a case, wherein the battery unit has a positive electrode, an electrolyte layer, and a negative electrode stacked. The upper connection terminal and the bottom connection terminal are formed at both ends of the positive electrode, the electrolyte layer, and the negative electrode in the stacking direction, and the case accommodates the battery unit, the upper connection terminal, and the bottom connection terminal, and is connected to the upper connection terminal. The terminal has an upper connection terminal exposed portion exposed from the case, the bottom connection terminal has a bottom connection terminal exposed portion exposed from the case, and the upper connection terminal exposed portion and the bottom connection terminal exposed portion are A secondary battery module in which secondary batteries that are stacked in the stacking direction and that are adjacent to each other in the stacking direction of the battery units are connected in series at the upper connection terminal exposed portion and the bottom connection terminal exposed portion. [Selection diagram] Fig. 4

Description

  The present invention relates to a secondary battery module.

  As a solid state battery that can be used for various battery storage parts and can be prevented from falling out of the battery storage part as an assembled battery, Patent Document 1 discloses the first electrode layer 12, the solid electrolyte layer 13, and the like. In the solid battery 10 having the laminate 19 including the second electrode layer 11, the first electrode layer 12 and the second electrode layer 11 are drawn out in opposite directions, and the first internal terminals 21 on the side surfaces of the laminate 19 are respectively provided. And a first external terminal 22 connected to the second internal terminal 23 and further formed on the first internal terminal 21 so as to expose a part of the first internal terminal 21, and formed on the second internal terminal 23. And a second external terminal 24 connected to expose a part of the second internal terminal 23, the second external terminal 24 extends to the upper surface of the laminate 19, and the first external terminal 22 is a laminate The solid battery 10 extending to the lower surface of 19 is opened. It is.

Japanese Unexamined Patent Publication No. 2016-1602

  In Patent Document 1, the second external terminal on the upper surface of the multilayer body and the first external terminal on the lower surface of the multilayer body of another solid battery adjacent to the solid battery are directly connected to each other so that the solid batteries are engaged with each other. Even if it is mounted on a battery, it prevents the solid battery from falling off. In a stacked secondary battery, it is common to press the secondary battery in the stacking direction of the stacked body in order to suppress the swelling of the secondary battery and secure the secondary batteries together. In the assembled battery, in order to maintain the contact of the first external terminal and the second external terminal, it is necessary to press in the in-plane direction of the laminate, and the productivity of the assembled battery may be reduced.

  An object of this invention is to improve the productivity of a secondary battery module.

  The features of the present invention for solving the above problems are as follows, for example.

  A secondary battery module configured by stacking a plurality of secondary batteries having a battery unit, an upper connection terminal, a bottom connection terminal, and a case, wherein the battery unit is configured by stacking a positive electrode, an electrolyte layer, and a negative electrode. The upper connection terminal and the bottom connection terminal are formed at both ends in the stacking direction of the positive electrode, the electrolyte layer, and the negative electrode, the case houses the battery unit, the upper connection terminal, and the bottom connection terminal, and the upper connection terminal The bottom connection terminal has a bottom connection terminal exposure part exposed from the case, and the top connection terminal exposure part and the bottom connection terminal exposure part overlap in the stacking direction. The secondary battery adjacent in the stacking direction of the battery units is a secondary battery module connected in series at the upper connection terminal exposed portion and the bottom connection terminal exposed portion.

  According to the present invention, the productivity of the secondary battery module can be improved. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is a schematic diagram of the secondary battery which concerns on one Embodiment of this invention. It is a schematic diagram of the secondary battery which concerns on one Embodiment of this invention. It is a component block diagram of the secondary battery which concerns on one Embodiment of this invention. It is a schematic diagram of the secondary battery module which concerns on one Embodiment of this invention. It is a schematic diagram of the battery unit which concerns on one Embodiment of this invention. It is a schematic diagram of the secondary battery which concerns on one Embodiment of this invention. It is a schematic diagram of the secondary battery module which concerns on one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description shows specific examples of the contents of the present invention, and the present invention is not limited to these descriptions. Various modifications by those skilled in the art are within the scope of the technical idea disclosed in this specification. Changes and modifications are possible. In all the drawings for explaining the present invention, components having the same function are denoted by the same reference numerals, and repeated description thereof may be omitted.

  1 and 2 are schematic views of a secondary battery according to an embodiment of the present invention, and FIG. 3 is a component configuration diagram of the secondary battery according to an embodiment of the present invention. FIG. 1 is a view in which the upper connection terminal 4000 can be confirmed, and FIG. 2 is a view in which the bottom connection terminal 5000 can be confirmed. Below, the case where a secondary battery is an all-solid-state battery is demonstrated.

  The secondary battery 2000 includes a plurality of battery units 1000, an upper connection terminal 4000 formed on the top of the plurality of battery units 1000, a bottom connection terminal 5000 formed on the bottom of the plurality of battery units 1000, and a case 3000. The upper connection terminal 4000 and the bottom connection terminal 5000 are formed at both ends in the stacking direction of a positive electrode, an electrolyte layer 300, and a negative electrode, which will be described later. The case 3000 houses a plurality of battery units 1000, an upper connection terminal 4000, and a bottom connection terminal 5000. 1, 2, and 3, the secondary battery 2000 includes a plurality of battery units 1000, but may include a single battery unit 1000.

  The upper connection terminal 4000 includes an upper connection plate 4100 and an upper connection block 4300. The upper connection plate 4100 is formed on the top of the plurality of battery units 1000 and is electrically connected to the plurality of battery units 1000. The upper connection block 4300 (upper connection terminal exposed portion) is formed on the upper connection plate 4100 and is exposed from the case 3000. In FIG. 3, the positive electrode current collector made of aluminum alloy is exposed at the top of the plurality of battery units 1000. Further, the material of the upper connection plate 4100 and the upper connection block 4300 is aluminum of the same member made of an aluminum alloy, like the positive electrode current collector.

  The upper insulating member 4200 is formed on the upper part of the upper connecting plate 4100 and is formed so as to surround the upper connecting block 4300. The upper insulating member 4200 insulates the upper connection terminal 4000 and the case 3000 from each other. The upper insulating member 4200 is provided with an upper insulating member opening 4250, and the upper connection block 4300 passes through the upper insulating member opening 4250. Examples of the material of the upper insulating member 4200 include insulating resins such as PBT, PP, and PC. By forming the upper insulating member 4200 by injection molding, the upper connection terminal 4000 and the case upper surface portion 3100 are integrated in advance.

  The bottom connection terminal 5000 is formed below the plurality of battery units 1000 and is electrically connected to the battery units 1000. The bottom connection terminal 5000 is exposed from the case 3000. A recess is formed in the lower part of the bottom connection terminal 5000, and can be fitted to the upper connection block 4300 in the adjacent secondary battery by the recess. In FIG. 3, a copper negative electrode current collector is exposed at the bottom of the plurality of battery units 1000. Further, the material of the bottom connection terminal 5000 is made of copper as in the negative electrode current collector.

  The bottom insulating member 5200 is formed below the bottom connection terminal 5000. The bottom insulating member 5200 insulates the bottom connecting terminal 5000 and the case 3000. The bottom insulating member 5200 is provided with a bottom insulating member opening 5250, which is formed so as to be fitted to the upper connection block 4300 in the adjacent secondary battery. Examples of the material of the bottom insulating member 5200 include insulating resins such as PBT, PP, and PC. By forming the bottom insulating member 5200 by injection molding, the bottom connection terminal 5000 and the case bottom surface portion 3500 are integrated in advance.

The case 3000 includes a case upper surface portion 3100, a case side surface portion 3200, a case front surface portion 3300, a case rear surface portion 3400, and a case bottom surface portion 3500. A case upper surface opening 3150 is provided in the case upper surface portion 3100, and the upper connection block 4300 passes through the case upper surface opening 3150. The case bottom surface portion 3500 is provided with a case bottom surface opening portion 3550, which is formed so as to be fitted to the upper connection block 4300 in the adjacent secondary battery. Flame retardant PBT is used as a material for the case 3000. Sealant is applied to the contact interfaces of the case upper surface portion 3100, the case side surface portion 3200, the case front surface portion 3300, the case rear surface portion 3400, and the case bottom surface portion 3500 to ensure airtightness. The material of the case 3000 may be an aluminum alloy or stainless steel in which at least the surface facing the battery unit 1000 group is insulated, and at this time, each part of the case may be secured by welding.
In FIG. 3, an upper connection block 4300 that is a convex portion is formed on the upper connection terminal 4000 and a concave portion is formed on the bottom connection terminal 5000, but a concave portion is formed on the upper connection terminal 4000 and a convex portion is formed on the bottom connection terminal 5000. A part may be formed. If the upper connection terminal 4000 and the bottom connection terminal 5000 can secure electrical connection, the upper connection terminal 4000 and the bottom connection terminal 5000 may not have irregularities, and convex portions are formed on both the upper connection terminal 4000 and the bottom connection terminal 5000. It may be. By forming a recess in one of the upper connection terminal 4000 and the bottom connection terminal 5000 and forming a protrusion in the other, the secondary batteries 2000 can be stacked with high density and electrically connected.

  FIG. 4 is a schematic diagram of a secondary battery module according to an embodiment of the present invention. In FIG. 4, adjacent secondary batteries 2000 are formed such that the upper connection terminal 4000 and the bottom connection terminal 5000 overlap in the stacking direction. When the secondary battery module 10000 is manufactured by stacking a plurality of secondary batteries 2000 as shown in FIG. 4, in order to suppress the swelling of the secondary battery 2000, a plurality of the secondary batteries 2000 are secured from both ends in the stacking direction. The secondary battery 2000 may be pressurized. At this time, since the plurality of secondary batteries 2000 are pressurized by the lashing body, the surface pressure can be applied to the upper connection terminal 4000 and the bottom connection terminal 5000 of the adjacent secondary battery 2000, so the secondary battery module. Can improve productivity.

  FIG. 5 is a schematic diagram of a battery unit according to an embodiment of the present invention. The battery unit 1000 includes a single-sided negative electrode 100, double-sided positive electrodes 250, an electrolyte layer 300, double-sided negative electrodes 150, and a single-sided positive electrode 200. Hereinafter, the one-side negative electrode 100 or the one-side positive electrode 200 may be referred to as a one-side electrode. The double-sided positive electrode 250 or the double-sided negative electrode 150 may be referred to as a double-sided electrode. One-side positive electrode 200 or both-side positive electrode 250 may be referred to as a positive electrode. The single-side negative electrode 100 or the double-side negative electrode 150 may be referred to as a negative electrode.

  The both-side positive electrode 250 includes two positive electrode mixture layers 251 and a positive electrode current collector 252. In both-side positive electrode 250, positive electrode mixture layers 251 are formed on both surfaces of positive electrode current collector 252. The one-side positive electrode 200 includes a positive electrode mixture layer 251 and a positive electrode current collector 252. In the one-side positive electrode 200, the positive electrode mixture layer 251 is formed on one surface of the positive electrode current collector 252, and the positive electrode current collector 252 is exposed on the other surface.

  The both-side negative electrode 150 includes two negative electrode mixture layers 151 and a negative electrode current collector 152. In the both-side negative electrode 150, the negative electrode mixture layer 151 is formed on both surfaces of the negative electrode current collector 152. The one-side negative electrode 100 includes a negative electrode mixture layer 151 and a negative electrode current collector 152. In the one-side negative electrode 100, the negative electrode mixture layer 151 is formed on one surface of the negative electrode current collector 152, and the negative electrode current collector 152 is exposed on the other surface.

  The electrode body 400 is configured by laminating the positive electrodes 250 on both sides, the electrolyte layer 300, and the negative electrodes 150 on both sides. A plurality of electrode bodies 400 are stacked, and the positive electrode current collectors 252 (positive electrode tabs 254) and the negative electrode current collectors 152 (negative electrode tabs 154) in the electrode bodies 400 are connected to each other. Parallel connection is configured. The battery unit 1000 is configured by laminating the one-side negative electrode 100, the electrolyte layer 300, the plurality of electrode bodies 400, the electrolyte layer 300, and the one-side positive electrode 200.

  The one-side negative electrode 100 and the one-side positive electrode 200 are formed at the end of the battery unit 1000 in the stacking direction, the negative electrode current collector 152 and the positive electrode current collector 252 are exposed, and the positive electrode current collector 252 is exposed. The exposed portion and the exposed portion of the negative electrode current collector 152 are arranged to face each other and are in contact with each other. Accordingly, by simply stacking another battery unit 1000 on a certain battery unit 1000, adjacent battery units 1000 can be connected in series, and an electrical multi-serial connection can be configured in the secondary battery 2000. In FIG. 5, the plurality of battery units 1000 are electrically connected in series in the stacking direction, but may be connected in parallel.

<Positive electrode mixture layer 251>
The positive electrode mixture layer 251 contains at least a positive electrode active material capable of inserting and extracting Li. Examples of the positive electrode active material include LiCo composite oxide, LiNi composite oxide, LiMn composite oxide, Li—Co—Ni—Mn composite oxide, LiFeP composite oxide, and the like. In the positive electrode mixture layer 251, a conductive material responsible for electronic conductivity in the positive electrode mixture layer 251, a binder that ensures adhesion between the materials in the positive electrode mixture layer 251, and further in the positive electrode mixture layer 251 A solid electrolyte for ensuring ionic conductivity may be included.

  As a method for manufacturing the positive electrode mixture layer 251, a material contained in the positive electrode mixture layer 251 is dissolved in a solvent to form a slurry, which is applied onto the positive electrode current collector 252. The coating method is not particularly limited, and for example, a conventional method such as a doctor blade method, a dipping method, or a spray method can be used. Thereafter, the positive electrode mixture layer 251 is formed through a drying process for removing the solvent and a pressing step for ensuring electron conductivity and ion conductivity in the positive electrode mixture layer 251.

<Positive electrode current collector 252>
The positive electrode current collector 252 has a positive electrode coating part 253 and a positive electrode tab 254. A positive electrode mixture layer 251 is formed on the positive electrode coating portion 253. The positive electrode mixture layer 251 is not formed on part or all of the positive electrode tab 254. The positive electrode tab 254 is arranged to take out the generated electricity to the outside, and protrudes from one side of the both-side positive electrode 250 or the one-side positive electrode 200. In FIG. 5, the positive electrode tab 254 protrudes in the same direction as a negative electrode tab 154 described later, but may protrude from a different direction. Since the positive electrode tab 254 and the negative electrode tab 154 protrude in the same direction, the area occupied by the positive electrode tab 254 and the negative electrode tab 154 in the battery unit 1000 can be reduced, and the energy density of the battery unit 1000 can be improved. Hereinafter, the positive electrode tab 254 or the negative electrode tab 154 may be referred to as an electrode tab.

  The respective positive electrode tabs 254 in the battery unit 1000 overlap when the battery unit 1000 is viewed from the stacking direction. The plurality of positive electrode tabs 254 in the battery unit 1000 are bonded by, for example, ultrasonic bonding. When the battery units 1000 are individually manufactured, other battery units 1000 do not interfere with each other during ultrasonic bonding. Moreover, since the same members are joined by ultrasonic joining and joined by ultrasonic joining without including different materials, the connection reliability is high.

  In FIG. 1, the plurality of joined positive electrode tabs 254 in the adjacent battery units 1000 overlap when the battery units 1000 are viewed from the stacking direction, but may not overlap. In FIG. 1, in the adjacent battery units 1000, a plurality of joined positive electrode tabs 254 in one battery unit 1000 and a plurality of joined positive electrode tabs 254 in the other battery unit 1000 are overlapped. However, a plurality of joined positive electrode tabs 254 in one battery unit 1000 and a plurality of joined negative electrode tabs 154 in the other battery unit 1000 may be overlapped. A plurality of joined positive electrode tabs 254 in adjacent battery units 1000 (or a plurality of positive electrode tabs 254 and a plurality of negative electrode tabs 154) are overlapped when the battery unit 1000 is viewed from the stacking direction, whereby the battery unit When 1000 is stored in a resin molded body, each battery unit 1000 can be stored in the same resin molded body. In FIG. 1, since adjacent battery units 1000 are connected in series, it is desirable that a plurality of joined positive electrode tabs 254 in adjacent battery units 1000 are insulated.

  For the positive electrode current collector 252, an aluminum foil, an aluminum perforated foil having a hole diameter of 0.1 to 10 mm, an expanded metal, a foamed aluminum plate, or the like is used. As the material, stainless steel, titanium, or the like can be applied in addition to aluminum. The thickness of the positive electrode current collector 252 is preferably 10 nm to 1 mm. About 1-100 micrometers is desirable from a viewpoint of the energy density of a secondary battery and the mechanical strength of an electrode.

<Negative electrode mixture layer 151>
The negative electrode mixture layer 151 contains at least a negative electrode active material capable of inserting and extracting Li. Examples of the negative electrode active material include carbon-based materials such as natural graphite, soft carbon, and amorphous carbon, Si metal, Si alloy, lithium titanate, and lithium metal. In the negative electrode mixture layer 151, a conductive material responsible for electronic conductivity in the negative electrode mixture layer 151, a binder for ensuring adhesion between the materials in the negative electrode mixture layer 151, and further in the negative electrode mixture layer 151 A solid electrolyte for ensuring ionic conductivity may be included.

  As a method for producing the negative electrode mixture layer 151, a material contained in the negative electrode mixture layer 151 is dissolved in a solvent to form a slurry, which is applied onto the negative electrode current collector 152. The coating method is not particularly limited, and for example, a conventional method such as a doctor blade method, a dipping method, or a spray method can be used. Thereafter, the negative electrode mixture layer 151 is formed through a drying process for removing the solvent and a pressing process for ensuring the electron conductivity and ion conductivity in the negative electrode mixture layer 151.

<Negative electrode current collector 152>
The negative electrode current collector 152 has a negative electrode coating part 153 and a negative electrode tab 154. The configurations of the negative electrode coating portion 153 and the negative electrode tab 154 are substantially the same as the configurations of the positive electrode coating portion 253 and the positive electrode tab 254.

  For the negative electrode current collector 152, a copper foil, a copper perforated foil having a hole diameter of 0.1 to 10 mm, an expanded metal, a foamed copper plate, or the like is used. In addition to copper, stainless steel, titanium, nickel, or the like can be applied. The thickness of the negative electrode current collector 152 is preferably 10 nm to 1 mm. About 1-100 micrometers is desirable from a viewpoint of the energy density of a secondary battery and the mechanical strength of an electrode.

<Electrolyte layer 300>
The electrolyte layer 300 includes, for example, a solid electrolyte. Examples of solid electrolytes include organic compounds such as sulfide systems such as Li ₁₀ Ge ₂ PS ₁₂ and Li ₂ S—P ₂ S ₅ , oxide systems such as Li—La—Zr—O, ionic liquids and room temperature molten salts. Examples thereof include materials that do not exhibit fluidity within the operating temperature range of a secondary battery, such as polymer types supported on inorganic particles, semi-solid electrolytes, and the like. The electrolyte layer 300 is formed by compressing powder, mixing with a binder, applying a slurryed solid electrolyte layer to a release material, or impregnating a carrier. The thickness of the electrolyte layer 300 is preferably a size of several nanometers to several millimeters from the viewpoint of ensuring the energy density of the secondary battery, ensuring electronic insulation, and the like.

  FIG. 6 is a schematic diagram of a secondary battery according to an embodiment of the present invention. In the present embodiment, the adjacent battery units 1000 are stacked so that the upper and lower sides are opposite to each other. As a result, the positive electrode tab 254 group and the negative electrode tab 154 group are alternately stacked for each battery unit 1000, and they are bus bars (see FIG. (Not shown). In FIG. 5, adjacent battery units 1000 are stacked in the same direction, and the positive electrode current collector 252 in one battery unit 1000 and the negative electrode current collector 152 in the other battery unit 1000 are brought into contact with each other to be adjacent to each other. Are connected in series, but as shown in FIG. 6, the electrode tabs of adjacent battery units 1000 may be joined to connect adjacent battery units 1000 in series. In that case, it is not necessary to expose the positive electrode current collector 252 and the negative electrode current collector 152 at the upper and lower ends of the battery unit 1000. When electrode tabs of adjacent battery units 1000 are joined and adjacent battery units 1000 are connected in series, it is desirable to cover the electrode body 400 in the battery unit 1000 with a resin film or the like.

  In FIG. 6, the upper connection plate tab 4150 is provided on the upper connection plate 4100 and is ultrasonically bonded together with the positive electrode tab group of the uppermost battery unit 1000 of the plurality of battery units 1000. Thereby, the plurality of battery units 1000 and the upper connection plate 4100 are electrically connected. Further, a bottom connection terminal tab 5050 is provided on the bottom connection terminal 5000 and is ultrasonically bonded together with the negative electrode tab group of the lowermost battery unit 1000 of the plurality of battery units 1000. Thereby, the plurality of battery units 1000 and the bottom connection terminal 5000 are electrically connected.

  FIG. 7 is a schematic diagram of a secondary battery module according to an embodiment of the present invention. The secondary battery module 10000 has a plurality of secondary batteries 2000 and a securing body 6000. Secured bodies 6000 are formed at both ends of the secondary battery module 10000 in the stacking direction, and a plurality of secondary batteries 2000 are formed between the two fixed bodies 6000 in the stacking direction.

  In FIG. 7, a plurality of secondary batteries 2000 are stacked in the stacking direction and connected in series. Since the terminals of a plurality of adjacent secondary batteries 2000 are in wide contact with the surface, the resistance can be lowered. In addition, since a bus bar that connects the terminals is unnecessary, the mounting density can be improved. Since the lashing body 6000 is formed only at both ends in the stacking direction of the secondary battery module 10000, it is not necessary to form the lashing body in units of the secondary battery 2000, and the mounting density can be improved. The lashing body 6000 is formed in a portion other than the portion where the upper connection block 4300 is formed. In other words, a space is formed between the securing body 6000 and the upper connection block 4300. Thereby, the connection part with the inverter etc. in the upper connection block 4300 is securable.

100 One-side negative electrode 150 Both-side negative electrode 151 Negative-electrode mixture layer 152 Negative-electrode current collector 153 Negative-electrode coating portion 154 Negative-electrode tab 200 One-side positive electrode 250 Both-side positive electrode 251 Positive-electrode mixture layer 252 Positive-electrode current collector 253 Positive-electrode coating portion 254 Positive-electrode tab 300 Electrolyte Layer 400 Electrode 1000 Battery unit 2000 Secondary battery 3000 Case 3100 Case upper surface portion 3150 Case upper surface opening portion 3200 Case side surface portion 3300 Case front surface portion 3400 Case rear surface portion 3500 Case bottom surface portion 3550 Case bottom surface opening portion 4000 Upper connection terminal 4100 Upper connection Plate 4150 Top connection plate tab 4200 Top insulation member 4250 Top insulation member opening 4300 Top connection block 5000 Bottom connection terminal 5050 Bottom connection terminal tab 5200 Bottom insulation member 5250 Bottom insulation member opening 6000 Secured body 10 00 secondary battery module

Claims (5)

A secondary battery module configured by stacking a plurality of secondary batteries having a battery unit, an upper connection terminal, a bottom connection terminal, and a case,
The battery unit is configured by laminating a positive electrode, an electrolyte layer, and a negative electrode,
The upper connection terminal and the bottom connection terminal are formed at both ends in the stacking direction of the positive electrode, the electrolyte layer, and the negative electrode,
The case houses the battery unit, the upper connection terminal, and the bottom connection terminal,
The upper connection terminal has an upper connection terminal exposed portion exposed from the case,
The bottom connection terminal has a bottom connection terminal exposed portion exposed from the case,
The upper connection terminal exposed portion and the bottom connection terminal exposed portion overlap in the stacking direction,
The secondary battery adjacent in the stacking direction of the battery units is a secondary battery module connected in series at the upper connection terminal exposed portion and the bottom connection terminal exposed portion. The secondary battery module according to claim 1,
The case has a case upper surface portion or a case bottom surface portion,
The case upper surface portion and the upper connection terminal, or the case bottom surface portion and the bottom connection terminal are pre-integrated together with an insulating member. The secondary battery module according to claim 1,
The secondary battery module has a lashing body,
A secondary battery module in which the lashing body is formed only at both ends in the stacking direction of the plurality of secondary batteries. The secondary battery module according to claim 1,
The positive electrode has a positive electrode current collector,
The negative electrode has a negative electrode current collector,
The positive electrode current collector and the negative electrode current collector are exposed at both ends in the stacking direction of the battery unit,
The exposed part of the positive electrode current collector and the exposed part of the negative electrode current collector are arranged opposite to each other, and are in contact with each other so that adjacent battery units are connected in series. Battery module. The secondary battery module according to claim 4,
The secondary battery module has a lashing body,
A secondary battery module in which a space is formed between the securing member and the upper connection terminal.

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