Power storage device and method for manufacturing power storage device

Abstract

The invention provides a power storage device and a method for manufacturing the power storage device. A power storage device is provided with a housing member having an insertion hole, a terminal member, and a resin member that fixes the terminal member to the housing member. The terminal member has a terminal top plate portion and a terminal extension portion. The terminal member and the resin member are sealed in an airtight manner only in a top plate roughened portion which is formed in a ring shape inside a top plate of the terminal top plate portion and has a roughened surface. In addition, the housing member and the resin member are sealed in an airtight manner only at a housing roughened portion which is formed in a ring shape on a housing inner side surface of the housing member and has a roughened surface.

Description

Technical Field

[0001] The present disclosure relates to a power storage device in which a terminal component is fixed to a housing component constituting a housing via a resin component, and a method for manufacturing the power storage device. Background Art

[0002] As a power storage device, a battery is known in which positive and negative terminal components are respectively fixed to a rectangular plate-shaped housing cover component (housing component) constituting a rectangular parallelepiped box-shaped housing via resin components. Specifically, the positive and negative terminal components are respectively inserted through insertion holes provided in the housing cover component. Further, the resin component contacts the housing cover component and the terminal component, thereby fixing the terminal component to the housing cover component.

[0003] Moreover, in such a battery, sometimes the entire surface of the contact surface of the housing cover component that contacts the resin component and the entire surface of the contact surface of the terminal component that contacts the resin component are surface roughened, and the resin component, the housing cover component, and the terminal component are hermetically sealed on the entire surface of each contact surface. In addition, as a related prior art, for example, Patent Document 1 can be cited.

[0004] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2011-216396

[0005] However, for the above-described battery, it has been found that when a thermal cycle test is performed, cracks sometimes occur between the resin component and the housing cover component or the terminal component, resulting in sealing failure, and thus it is difficult to maintain the sealing performance between the resin component, the housing cover component, and the terminal component well for a long time. Summary of the Invention

[0006] The present disclosure has been made in view of this situation, and provides a power storage device and a method for manufacturing a power storage device that can maintain the sealing performance between a resin component that fixes a terminal component to a housing component, the housing component, and the terminal component well. (1)

[0008] One aspect of the present disclosure for solving the above problems is a power storage device as follows: The power storage device includes: a housing member having an insertion hole; a terminal member inserted into the insertion hole of the housing member; and a resin member that insulates between the housing member and the terminal member, and the resin member contacts the housing member and the terminal member to fix the terminal member to the housing member. The terminal member has: a terminal top plate portion that is plate-shaped and located outside the housing member; and a terminal protruding portion that extends from the terminal top plate portion toward the inside of the housing member, passes through the insertion hole, and penetrates the resin member. The terminal member and the resin member are hermetically sealed only at a top plate roughened portion, and the top plate roughened portion is formed in a belt shape over the entire circumference of the terminal top plate portion on the inner surface of the top plate facing the housing member and the surface is roughened. The housing member and the resin member are hermetically sealed only at a housing roughened portion, and the housing roughened portion is formed in a belt shape over the entire circumference of the insertion hole on the inner surface of the housing member facing the inside and the surface is roughened.

[0009] In the above power storage device, the housing member and the resin member are not hermetically sealed through the entire portion where they contact, but only at the housing roughened portion. In addition, the terminal member and the resin member are not hermetically sealed through the entire portion where they contact, but only at the top plate roughened portion. Thus, it can be found that compared with the case where the housing member and the resin member are hermetically sealed through the entire portion where they contact and the terminal member and the resin member are hermetically sealed through the entire portion where they contact, the sealing performance between the housing member and the resin member and the sealing performance between the terminal member and the resin member can be maintained well respectively.

[0010] The reason is that compared with the case where the entire portion where the housing member and the resin member contact and the entire portion where the terminal member and the resin member contact are hermetically sealed, if only the housing roughened portion and only the top plate roughened portion are hermetically sealed, the stress generated in the resin member is small in cases such as during a thermal cycle test. And in the above power storage device, the housing roughened portion and the top plate roughened portion are separated, so the stress generated in the portion of the resin member disposed between the housing roughened portion and the top plate roughened portion is small. Therefore, it is considered that cracks are difficult to occur in the sealed portions between the housing roughened portion and the resin member and between the top plate roughened portion and the resin member, and the sealing performance can be maintained well.

[0011] In addition, examples of the "power storage device" include secondary batteries such as lithium-ion secondary batteries, sodium-ion secondary batteries, and calcium-ion secondary batteries, and capacitors such as lithium-ion capacitors. (2)

[0013] Furthermore, in the power storage device described in (1), it can be configured such that: shell nano-columns stand in the shell roughened portion of the shell member, the shell nano-columns are formed by beads of particles of the metal used to form the shell member joined in a columnar shape, and the height is 50 nm or more; terminal nano-columns stand in the top plate roughened portion, the terminal nano-columns are formed by beads of particles of the metal used to form the terminal member joined in a columnar shape, and the height is 50 nm or more; the resin material used to form the resin member is filled between the standing shell nano-columns, so that the resin member is hermetically joined to the shell roughened portion, and the resin material is filled between the standing terminal nano-columns, so that the resin member is hermetically joined to the top plate roughened portion.

[0014] In the above power storage device, the shell roughened portion of the shell member is made into a roughened portion at the nanoscale (nanometer level) where the above shell nano-columns stand, and the resin material is filled between the standing shell nano-columns, so that the resin member is hermetically joined to the shell roughened portion. Therefore, the sealing performance and joining strength between the shell member and the resin member can be particularly improved. In addition, the top plate roughened portion of the terminal member is made into a roughened portion at the nanoscale where the above terminal nano-columns stand, and the resin material is filled between the standing terminal nano-columns, so that the resin member is hermetically joined to the top plate roughened portion. Therefore, the sealing performance and joining strength between the terminal member and the resin member can be particularly improved. (3)

[0016] In addition, another method is a manufacturing method of a power storage device, which is as follows: The above power storage device includes: a housing member having an insertion through-hole; a terminal member inserted into the insertion through-hole of the housing member; and a resin member that insulates between the housing member and the terminal member, and the resin member contacts the housing member and the terminal member to fix the terminal member to the housing member. The terminal member includes: a terminal top plate portion that is plate-shaped and located outside the housing member; and a terminal protruding portion that extends from the terminal top plate portion toward the inside of the housing member, passes through the insertion through-hole, and penetrates the resin member. The terminal member and the resin member are hermetically sealed only at a top plate roughened portion. The top plate roughened portion is formed in a belt shape over the entire circumference of the terminal top plate portion on the inner surface of the top plate facing the housing member side and has a roughened surface. The housing member and the resin member are hermetically sealed only at a housing roughened portion. The housing roughened portion is formed in a belt shape over the entire circumference of the insertion through-hole on the inner surface of the housing member facing the inside and has a roughened surface. Among them, the manufacturing method of the above power storage device includes: a housing roughening process of performing a surface roughening process on the housing member before roughening to form the housing roughened portion; a terminal forming process of welding a top plate member forming the terminal top plate portion and a protruding member forming the terminal protruding portion to form the terminal member; a top plate roughening process of performing a surface roughening process on the top plate member before roughening to form the top plate roughened portion before the terminal forming process; and a resin molding process of molding the resin member that is hermetically joined to the housing roughened portion and the top plate roughened portion in a state where the terminal member is inserted into the insertion through-hole of the housing member.

[0017] In the manufacturing method of the above power storage device, before welding the top plate member and the protruding member to form the terminal member, a surface roughening process is performed on the top plate member to form the top plate roughened portion. Therefore, when the top plate roughened portion is formed, the terminal protruding portion does not exist, and the terminal protruding portion does not become an obstacle, so the top plate roughened portion can be easily formed. In addition, before the resin molding process, the housing roughened portion is formed in the housing member, and the top plate roughened portion is formed in the terminal member. Therefore, in the resin molding process, the resin member that is hermetically joined to the housing roughened portion and the top plate roughened portion can be easily molded by the anchoring effect.

[0018] Examples of the "surface roughening treatment" include physical surface roughening treatments such as shot peening, sandblasting, and metal spraying, chemical surface roughening treatments such as anodic oxidation and chemical etching, and surface roughening treatments that form nano-scale unevenness by irradiating with a pulsed laser, etc. (4)

[0020] Furthermore, in the manufacturing method of the power storage device described in (3), it is preferable that: after the above-mentioned terminal forming step and before the above-mentioned resin molding step, there is also a terminal insertion step of inserting the above-mentioned terminal member into the above-mentioned insertion hole of the above-mentioned housing member.

[0021] In the manufacturing method of the power storage device described above, in the terminal insertion step after the terminal forming step, the terminal member is inserted into the insertion hole of the housing member. Therefore, when the terminal member is formed, the housing member does not exist, and thus the formation of the terminal member (welding of the top plate member and the protruding member) can be easily performed. (5)

[0023] Furthermore, in the manufacturing method of the power storage device described in (3), it is preferable that: the above-mentioned protruding member has a hole inner arrangement portion that is arranged in the above-mentioned insertion hole of the above-mentioned housing member and is welded to the above-mentioned top plate member, and the above-mentioned terminal forming step is a step of welding the above-mentioned hole inner arrangement portion and the above-mentioned top plate member in a state where the above-mentioned hole inner arrangement portion of the above-mentioned protruding member is arranged in the above-mentioned insertion hole of the above-mentioned housing member.

[0024] In the manufacturing method of the power storage device described above, in the terminal forming step, in a state where the hole inner arrangement portion of the protruding member is arranged in the insertion hole of the housing member, the hole inner arrangement portion and the top plate member are welded to form the terminal member. In this way, since the formation of the terminal member and the insertion of the terminal member into the insertion hole can be performed simultaneously, there is no need to perform a step of inserting the terminal member into the insertion hole afterwards. In addition, the insertion hole can be designed to be smaller (a smaller insertion hole that cannot insert the terminal member after the terminal member is formed can be provided). (6)

[0026] Further, in the method for manufacturing the power storage device according to any one of (3) to (5), it may be that: shell nano-columns stand in the above-mentioned shell roughening portion, the shell nano-columns are formed by beads of particles of the metal from which the above-mentioned shell member is formed and combined into a column shape, and the height is 50 nm or more; terminal nano-columns stand in the above-mentioned top plate roughening portion, the terminal nano-columns are formed by beads of particles of the metal from which the above-mentioned terminal member is formed and combined into a column shape, and the height is 50 nm or more; the resin material for forming the above-mentioned resin member is filled between the above-mentioned shell nano-columns standing side by side, so that the above-mentioned resin member is hermetically joined to the above-mentioned shell roughening portion, and the above-mentioned resin material is filled between the above-mentioned terminal nano-columns standing side by side, so that the above-mentioned resin member is hermetically joined to the above-mentioned top plate roughening portion; in the above-mentioned shell roughening process, pulsed laser is intermittently irradiated on the above-mentioned shell member before roughening in a manner of staggering the irradiation positions, so as to form the above-mentioned shell roughening portion in which the above-mentioned shell nano-columns stand; in the above-mentioned top plate roughening process, pulsed laser is intermittently irradiated on the above-mentioned top plate member before roughening in a manner of staggering the irradiation positions, so as to form the above-mentioned top plate roughening portion in which the above-mentioned terminal nano-columns stand; in the above-mentioned resin molding process, the above-mentioned resin material is filled between the above-mentioned shell nano-columns standing in the above-mentioned shell roughening portion and between the above-mentioned terminal nano-columns standing in the above-mentioned top plate roughening portion, so as to mold the above-mentioned resin member.

[0027] In the above-mentioned method for manufacturing the power storage device, since in the shell roughening process, as described above, pulsed laser is irradiated on the shell member before roughening to form the shell roughening portion in which shell nano-columns stand, it is possible to easily provide a shell roughening portion at the nanometer level. In addition, since in the top plate roughening process, as described above, pulsed laser is irradiated on the top plate member before roughening to form the top plate roughening portion in which terminal nano-columns stand, it is possible to easily provide a top plate roughening portion at the nanometer level. Moreover, in the resin molding process, the resin material is filled between the shell nano-columns standing in the shell roughening portion and between the terminal nano-columns standing in the top plate roughening portion, and the resin member is molded. Thereby, it is possible to particularly improve the sealing performance and bonding strength between the resin member, the shell member, and the terminal member. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a perspective view of the battery according to the embodiment.

[0029] Figure 2 It is a partial cross-sectional view of the battery according to the embodiment along the battery height direction and the battery width direction.

[0030] Figure 3It is a cross-sectional view near the resin component in the battery according to the embodiment, along the battery height direction and the battery thickness direction.

[0031] Figure 4 Relating to the embodiment, it is an enlarged cross-sectional view magnifying the sealed portion between the housing roughened portion (or top plate roughened portion) and the resin component.

[0032] Figure 5 It is a flowchart of the manufacturing method of the battery according to the embodiment.

[0033] Figure 6 Regarding the manufacturing method of the battery according to the embodiment, it is an explanatory diagram showing the appearance of forming a plurality of bowl-shaped recesses and nanocolumns standing in the bowl-shaped recesses by scanning pulsed laser.

[0034] Figure 7 Regarding the manufacturing method of the battery according to the embodiment, it is an explanatory diagram showing the appearance of laser-welding the top plate component and the protruding component to form the terminal component.

[0035] Figure 8 Relating to the comparative mode, it is Figure 3 A cross-sectional view near the corresponding resin component.

[0036] Explanation of reference numerals:

[0037] 1... Battery (power storage device); 10... Housing; 21... Housing cover component (housing component); 21Z... (Before roughening) housing cover component; 21h... Insertion through hole; 24... Inner side of the housing; 27... Housing roughened portion; 29... Housing nanocolumn; 29p... (Particle for forming the housing nanocolumn); 30... Electrode body; 40... Terminal component; 43... Terminal top plate portion; 45... Inside of the top plate; 47... Top plate roughened portion; 49... Terminal nanocolumn; 49p... (Particle for forming the terminal nanocolumn); 53... Terminal protruding portion; 56... Top plate component; 56Z... (Before roughening) top plate component; 57... Protruding component; 60... Resin component; 61... (Resin material for forming the resin component); DH... (Outside of the housing cover component); EH... (Inside of the housing cover component); ha... (Height of the nanocolumn); LB... Pulsed laser; S1... Housing roughening process; S2... Top plate roughening process; S3... Terminal forming process; S4... Terminal insertion process; S5... Resin forming process. Detailed description of the embodiment

[0038] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Figure 1 A perspective view showing the battery (power storage device) 1 of the present embodiment, Figure 2 Showing a partial cross-sectional view of the battery 1. In addition, Figure 3A cross-sectional view near the resin member 60 in the battery 1 is shown. And, Figure 4 An enlarged cross-sectional view showing the sealed portion between the housing roughened portion 27 (or the top plate roughened portion 47) and the resin member 60 is shown. Further, hereinafter, the battery height direction AH, the battery width direction BH, and the battery thickness direction CH of the battery 1 are defined as Figure 1 and Figure 2 the directions shown for explanation.

[0039] The battery 1 is a square (rectangular parallelepiped shape) and sealed lithium-ion secondary battery mounted on vehicles such as hybrid vehicles, plug-in hybrid vehicles, and electric vehicles. The battery 1 is composed of a housing 10, an electrode body 30 housed in the housing 10, an electrolyte 5, and positive and negative terminal members 40 fixed to the housing 10 via resin members 60, etc. The electrode body 30 is covered by an insulating holder 7 in the housing 10. The insulating holder 7 is composed of an insulating film and is in the shape of a bag that is open at the upper side AH1 in the battery height direction AH.

[0040] The electrode body 30 is in the shape of a rectangular parallelepiped and is a stacked type, and is formed by alternately stacking a plurality of rectangular positive electrode plates 31 and a plurality of rectangular negative electrode plates 32 in the battery thickness direction CH via a rectangular separator 33 made of a resin porous film. On one side BH1 in the battery width direction BH of the electrode body 30, the current collector foils of the respective positive electrode plates 31 project upward to the upper side AH1 and overlap in the battery thickness direction CH to form a positive electrode current collector portion 30c. The positive electrode current collector portion 30c is conductively connected to the positive terminal member 40. Further, on the other side BH2 in the battery width direction BH of the electrode body 30, the current collector foils of the respective negative electrode plates 32 project upward to the upper side AH1 and overlap in the battery thickness direction CH to form a negative electrode current collector portion 30d. The negative electrode current collector portion 30d is conductively connected to the negative terminal member 40.

[0041] The housing 10 is in the shape of a rectangular parallelepiped box made of metal (aluminum in this embodiment), and is composed of a housing main body member 11 and a housing cover member 21. In this embodiment, the housing cover member 21 corresponds to the above-mentioned "housing member". The housing main body member 11 is in the shape of a bottomed square cylinder having a rectangular opening 11c, and houses an electrode body 30 therein. On the other hand, the housing cover member 21 is in the shape of a rectangular plate having a housing outer side surface 23 facing the outside DH (upper side AH1 in this embodiment) of the housing cover member 21 and a housing inner side surface 24 facing the inside EH (lower side AH2 in the battery height direction AH) of the housing cover member 21, and closes the opening 11c of the housing main body member 11. The peripheral portion 21f of the housing cover member 21 and the opening 11c of the housing main body member 11 are hermetically welded over their entire circumferences. An overpressure valve 21w that breaks and opens when the internal pressure of the housing 10 exceeds the opening pressure is provided in the housing cover member 21. In addition, a liquid injection hole 21k is provided in the housing cover member 21, and the liquid injection hole 21k is hermetically sealed by a disc-shaped sealing member 15.

[0042] In addition, rectangular insertion holes 21h are provided near the ends on one side BH1 and the other side BH2 in the battery width direction BH in the housing cover member 21. A terminal member 40 of the positive electrode made of aluminum is inserted into the insertion hole 21h on one side BH1. A resin member 60 of the positive electrode insulates between the housing cover member 21 and the terminal member 40, and contacts the housing cover member 21 and the terminal member 40, and the terminal member 40 is fixed to the housing cover member 21. A terminal member 40 of the negative electrode made of copper is inserted into the insertion hole 21h on the other side BH2. A resin member 60 of the negative electrode insulates between the housing cover member 21 and the terminal member 40, and contacts the housing cover member 21 and the terminal member 40, and the terminal member 40 is fixed to the housing cover member 21. The positive and negative terminal members 40 have the same shape, and the positive and negative resin members 60 also have the same shape, so the following description will be concentrated.

[0043] Each terminal member 40 is formed by welding and integrating a top plate member 56 and a protruding member 57 described later, and has a terminal top plate portion 43 and a terminal protruding portion 53. The terminal member 40 of the positive electrode is made of aluminum, and the terminal member 40 of the negative electrode is made of copper.

[0044] The terminal top plate portion 43 is in the shape of a rectangular plate having a top plate top surface 44 facing the outside DH (upper side AH1) and a top plate inner surface 45 facing the inside EH (lower side AH2), and extends in the battery width direction BH and the battery thickness direction CH.

[0045] The terminal protruding portion 53 extends from the terminal top plate portion 43 toward the inner side EH (lower side AH2), passes through the insertion through hole 21h, and penetrates the resin member 60. Specifically, the terminal protruding portion 53 is composed of a plate-shaped main body portion 54 and a hole inner arrangement portion 55 that protrudes upward from the main body portion 54 and is arranged in the insertion through hole 21h. The main body portion 54 is in the shape of a rectangular plate that is long in the battery width direction BH and is located on the inner side EH (lower side AH2) of the housing cover member 21. On the other hand, the hole inner arrangement portion 55 is in the shape of a bottomed cylinder with an upper bottom 55a and the upper side AH1 closed. It passes through the insertion through hole 21h from the main body portion 54 and extends to the terminal top plate portion 43, and the upper bottom 55a abuts against the terminal top plate portion 43. Moreover, the central portion of the upper bottom 55a is welded to the central portion of the terminal top plate portion 43. The main body portion 54 of the terminal protruding portion 53 of the positive electrode is welded to the positive electrode current collecting portion 30c of the electrode body 30. On the other hand, the main body portion 54 of the terminal protruding portion 53 of the negative electrode is welded to the negative electrode current collecting portion 30d of the electrode body 30.

[0046] Next, the relationship among the housing cover member 21, the terminal member 40, and the resin member 60 will be described. The hole peripheral portion 25 around the insertion through hole 21h in the housing surface 22 of the housing cover member 21 is in contact with the resin member 60. The hole peripheral portion 25 faces the inner side EH and is a part of the above-described inner housing surface 24, and has a rectangular belt-shaped hole peripheral inner portion 26 that extends over the entire circumference of the insertion through hole 21h. And, the hole peripheral inner portion 26 is in the shape of a rectangular belt that extends over the entire circumference of the insertion through hole 21h and has a housing roughened portion 27 with a roughened surface. In the present embodiment, the entire hole peripheral inner portion 26 becomes the housing roughened portion 27.

[0047] The housing roughened portion 27 is subjected to a roughening treatment based on a pulsed laser LB described later (refer to Figure 6 ), and thus becomes a nano-level nano roughened portion. Specifically, in the housing roughened portion 27, a plurality of bowl-shaped recesses 28 with a diameter Da of 30 to 300 μm (the diameter is approximately Da = 80 μm in the present embodiment) that are recessed in a bowl shape or a crater shape are arranged in an overlapping manner (refer to Figure 6 ). And, in these bowl-shaped recesses 28, housing nanocolumns 29 with a height ha of 50 nm or more (the height is approximately ha = 200 nm in the present embodiment) in which particles 29p made of the metal forming the housing cover member 21 are combined in a bead shape into a column stand upright (refer to Figure 4 and Figure 6 ). The metal forming the housing cover member 21 is aluminum as described above, and the housing nanocolumns 29 are formed by particles 29p composed of aluminum and aluminum oxide. As will be described later, the housing cover member 21 and the resin member 60 are hermetically sealed only at the housing roughened portion 27.

[0048] The hole vicinity portion 42 near the insertion through-hole 21h in the terminal surface 41 of the terminal component 40 is in contact with the resin component 60. Regarding this hole vicinity portion 42, the inner surface 45 of the above-mentioned top plate is included. And, this inner surface 45 of the top plate is in the shape of a rectangular belt ring extending over the entire circumference of the terminal top plate portion 43 and has a top plate roughened portion 47 with a roughened surface. In the present embodiment, the peripheral portion of the inner surface 45 of the top plate becomes the top plate roughened portion 47.

[0049] The top plate roughened portion 47 is the same as the housing roughened portion 27 of the above-mentioned housing cover component 21 and becomes a nano-level nano-roughened portion. That is, a plurality of bowl-shaped recesses 48 are arranged in the top plate roughened portion 47 (refer to Figure 6 ), and in each bowl-shaped recess 48, terminal nano-columns 49 in which particles 49p made of the metal forming the terminal component 40 are combined in a bead shape into a column and have a height ha of 50 nm or more (in the present embodiment, the height is approximately ha = 200 nm) stand upright (refer to Figure 4 and Figure 6 ). The metal of the terminal component 40 forming the positive electrode is aluminum as described above, and the terminal nano-columns 49 of the positive electrode are formed by particles 49p composed of aluminum and aluminum oxide. On the other hand, the metal of the terminal component 40 forming the negative electrode is copper as described above, and the terminal nano-columns 49 of the negative electrode are formed by particles 49p composed of copper and copper oxide. As will be described later, the terminal component 40 and the resin component 60 are hermetically sealed only at this top plate roughened portion 47.

[0050] The resin component 60 is composed of a thermoplastic resin material 61. This resin material 61 includes a thermoplastic main resin (polyphenylene sulfide (PPS) in the present embodiment), a thermoplastic elastomer (thermoplastic polyurethane elastomer in the present embodiment), and a filler (fibrous glass filler in the present embodiment). The resin component 60 is in contact with the hole peripheral portion 25 in the housing surface 22 of the housing cover component 21 and is in contact with the hole vicinity portion 42 in the terminal surface 41 of the terminal component 40, thereby fixing the terminal component 40 to the housing cover component 21.

[0051] Further, the resin material 61 is filled between the housing nano-columns 29 standing in the hole peripheral portion 25 of the housing cover member 21 and adjacent to the housing roughened portion 27, so that the resin member 60 is hermetically joined to the housing roughened portion 27 over the entire circumference. That is, the resin member 60 and the housing cover member 21 are hermetically sealed only at the housing roughened portion 27. In addition, the resin material 61 is filled between the terminal nano-columns 49 standing in the hole vicinity portion 42 of the terminal member 40 and adjacent to the top plate roughened portion 47, so that the resin member 60 is hermetically joined to the top plate roughened portion 47 over the entire circumference. That is, the resin member 60 and the terminal member 40 are hermetically sealed only at the top plate roughened portion 47.

[0052] In the battery 1 of the present embodiment, for the housing cover member 21 and the resin member 60, the entire portion where they contact is not hermetically sealed. That is, unlike the comparative method shown in Figure 8 , where the entire hole peripheral portion 25 is used as the housing roughened portion 927 and hermetically sealed through the entire hole peripheral portion 25, they are hermetically sealed only at the housing roughened portion 27 (see Figure 3 ). In addition, for the terminal member 40 and the resin member 60, the entire portion where they contact is not hermetically sealed. That is, unlike the case shown in Figure 8 , where the entire hole vicinity portion 42 is used as the roughened portion 947 and hermetically sealed through the entire hole vicinity portion 42, they are hermetically sealed only at the top plate roughened portion 47 (see Figure 3 ). Thus, compared with the case where the housing cover member 21 and the resin member 60 are hermetically sealed through the entire hole peripheral portion 25 and the terminal member 40 and the resin member 60 are hermetically sealed through the entire hole vicinity portion 42 (see Figure 8 ), the sealing performance between the housing cover member 21 and the resin member 60 and the sealing performance between the terminal member 40 and the resin member 60 can be maintained well respectively.

[0053] The reason is considered as follows. That is, compared with the case of hermetically sealing through the entire hole peripheral portion 25 of the housing cover member 21 and the entire hole vicinity portion 42 of the terminal member 40, if hermetically sealed only at the housing roughened portion 27 and only at the top plate roughened portion 47, the stress generated in the resin member 60 is small in cases such as during a thermal cycle test. And in the battery 1, the housing roughened portion 27 and the top plate roughened portion 47 are separated. Specifically, the distance indicated by the arrow P in Figure 3 is larger than that in Figure 8The distance indicated by arrow J in the Chinese text is long. Therefore, in this embodiment, the stress generated in the portion 60g of the resin member 60 disposed between the housing roughened portion 27 and the top plate roughened portion 47 is small. Therefore, it is considered that cracks are less likely to occur in the sealing portions between the housing roughened portion 27 and the resin member 60 and between the top plate roughened portion 47 and the resin member 60, and the sealing performance can be maintained well.

[0054] Moreover, in this embodiment, the housing roughened portion 27 of the housing lid member 21 is a nanoscale roughened portion in which housing nanocolumns 29 stand, and a resin material 61 is filled between the standing housing nanocolumns 29, thereby hermetically bonding the resin member 60 and the housing roughened portion 27. Therefore, the sealing performance and the bonding strength between the housing lid member 21 and the resin member 60 can be particularly improved. In addition, the top plate roughened portion 47 of the terminal member 40 is a nanoscale roughened portion in which terminal nanocolumns 49 stand, and a resin material 61 is filled between the standing terminal nanocolumns 49, thereby hermetically bonding the resin member 60 and the top plate roughened portion 47. Therefore, the sealing performance and the bonding strength between the terminal member 40 and the resin member 60 can also be particularly improved.

[0055] Next, a method for manufacturing the above-described battery 1 will be described (refer to Figures 5 to 7 ). First, in the housing roughening step S1 (refer to Figure 5 ), a housing lid member 21Z before roughening is prepared, and the housing lid member 21Z is subjected to a surface roughening treatment to form a housing roughened portion 27 (refer to Figure 6 ). In this embodiment, the pulsed laser LB is intermittently irradiated on the inner side 26 of the hole periphery of the hole periphery portion 25 in the housing surface 22 of the housing lid member 21Z in a manner of staggering the irradiation positions, thereby forming a housing roughened portion 27 in which a plurality of bowl-shaped recesses 28 in which housing nanocolumns 29 stand are arranged in a partially overlapping manner. The irradiation conditions of the laser are as follows: the wavelength is 1064 nm, the peak output is 5 kW, the pulse width is 150 ns, the pitch pb is 75 μm, and the spot diameter is 80 μm.

[0056] In the portion of the housing lid member 21Z irradiated with the pulsed laser LB, the metal (specifically, aluminum) near the housing surface 22 is melted and further becomes vapor. After that, when the temperature of the vapor decreases, it becomes particles 29p of aluminum and aluminum oxide and accumulates in the bowl-shaped recess 28. By intermittently irradiating the pulsed laser LB on the housing lid member 21Z in a manner of staggering the irradiation positions, the particles 29p are stacked in a bead shape and combined into a column shape, thereby forming the standing housing nanocolumns 29 (refer to Figure 6 and Figure 4 ).

[0057] In addition, in another top plate roughening process S2 (refer to Figure 5 ), positive and negative top plate members 56Z before roughening are prepared, and surface roughening treatment is performed on each top plate member 56Z to respectively form a top plate roughening portion 47. In the present embodiment, pulsed laser LB is intermittently irradiated on the peripheral portion of the inner surface 45 of the top plate in the top plate member 56Z in a manner of staggering the irradiation positions, so as to form a top plate roughening portion 47 in which a plurality of bowl-shaped recesses 48 with terminal nanocolumns 49 standing are arranged in a partially overlapping manner (refer to Figure 6 ). In addition, the irradiation conditions of the laser on the top plate member 56Z of the positive electrode made of aluminum are the same as those in the case roughening process S1. On the other hand, the irradiation conditions of the laser on the top plate member 56Z of the negative electrode made of copper are as follows: the wavelength is 1064 nm, the peak output is 20 kW, the pulse width is 50 ns, the pitch pb is 60 μm, and the spot diameter is 75 μm.

[0058] Next, in the terminal forming process S3 (refer to Figure 5 ), positive and negative protruding members 57 are prepared, and each protruding member 57 is welded to the top plate member 56 provided with the above-mentioned top plate roughening portion 47 to respectively form positive and negative terminal members 40 (refer to Figure 7 ). Specifically, the upper bottom portion 55a of the hole inner configuration portion 55 of the protruding member 57 is brought into contact with the inner surface 45 of the top plate of the top plate member 56. After that, laser LC is irradiated from the side of the protruding member 57 toward the center of the inner surface of the upper bottom portion 55a of the hole inner configuration portion 55 of the protruding member 57 to the side of the top plate member 56 (from the lower side to the upper side in Figure 7 ), and the upper bottom portion 55a of the protruding member 57 is welded to the top plate member 56, thereby forming a terminal member 40 in which the protruding member 57 and the top plate member 56 are integrated. In the present embodiment, when forming this terminal member 40, the case cover member 21 does not exist, so the case cover member 21 does not become an obstacle, and the formation of the terminal member 40 can be easily performed.

[0059] Next, in the terminal insertion process S4 (refer to Figure 5 ), positive and negative terminal members 40 are inserted into a pair of insertion holes 21h of the case cover member 21. Specifically, a molding die (not shown) having an upper die and a lower die is used to arrange the positive and negative terminal members 40 and the case cover member 21 at predetermined positions of the lower die, and the positive and negative terminal members 40 are respectively inserted into the insertion holes 21h of the case cover member 21. After that, the upper die is moved toward the lower die to close the molding die.

[0060] Next, in the resin molding process S5 (refer to Figure 5)In the state where the positive and negative terminal components 40 are respectively inserted into a pair of insertion holes 21h of the above-mentioned housing cover component 21, insert molding is performed on a pair of resin components 60 that are in contact with the housing cover component 21 and the positive and negative terminal components 40. Specifically, the molten resin formed by melting the resin material 61 is injected into each cavity (not shown), and each cavity is filled with the molten resin. At this time, the molten resin of the resin material 61 is also filled between the housing nanocolumns 29 standing in the housing roughening portion 27 of the housing cover component 21 and between the terminal nanocolumns 49 standing in the top plate roughening portion 47 of the terminal component 40 (refer to Figure 4 ). Then, a pair of resin components 60 that are hermetically joined to the housing roughening portion 27 of the housing cover component 21, in contact with the hole peripheral portion 25 of the housing cover component 21, hermetically joined to the top plate roughening portion 47 of the terminal component 40, and in contact with the hole vicinity portion 42 of the terminal component 40 are molded. After that, a cover assembly (not shown) in which the positive and negative terminal components 40 are fixed to the housing cover component 21 via these resin components 60 is taken out from the molding die.

[0061] Next, in the electrode body connection process S6 (refer to Figure 5 ), an electrode body 30 obtained by laminating a positive electrode plate 31, a negative electrode plate 32, and a separator 33 is prepared, and the positive electrode current collector portion 30c of the electrode body 30 is welded to the main body portion 54 of the terminal protruding portion 53 in the positive terminal component 40. In addition, the negative electrode current collector portion 30d of the electrode body 30 is welded to the main body portion 54 of the terminal protruding portion 53 in the negative terminal component 40. After that, the electrode body 30 is wrapped with a bag-shaped insulating holding member 7.

[0062] Next, in the electrode body housing and housing forming process S7, a housing main body component 11 is prepared, the electrode body 30 covered with the above-mentioned insulating holding member 7 is inserted into the housing main body component 11, and the opening portion 11c of the housing main body component 11 is blocked by the housing cover component 21. Then, the opening portion 11c of the housing main body component 11 and the peripheral portion 21f of the housing cover component 21 are laser welded in an airtight manner over the entire circumference to form the housing 10.

[0063] Next, in the liquid injection and sealing process S8, the electrolyte 5 is injected into the housing 10 through the liquid injection hole 21k, and the electrolyte 5 is allowed to penetrate into the electrode body 30. After that, the liquid injection hole 21k is sealed in an airtight manner by the sealing member 15.

[0064] Next, in the initial charging and aging process S9, the battery 1 is initially charged. After that, the battery 1 is allowed to stand for a specified time to age the battery 1. Thus, the battery 1 is completed.

[0065] In the method for manufacturing the battery 1 of the present embodiment, before welding the top plate member 56 and the protruding member 57 to form the terminal member 40 as described above, the surface of the top plate member 56 is roughened to form the top plate roughened portion 47. Therefore, when the top plate roughened portion 47 is formed, the terminal protruding portion 53 does not exist and does not interfere, so that the top plate roughened portion 47 can be easily formed. In addition, before the resin molding step S5, a housing roughened portion 27 is formed in the housing cover member 21, and a top plate roughened portion 47 is formed in the terminal member 40. Therefore, in the resin molding step S5, the resin member 60 that is hermetically joined to the housing roughened portion 27 and the top plate roughened portion 47 can be easily molded by the anchoring effect.

[0066] Moreover, in the present embodiment, in the housing roughening step S1, the pulsed laser LB is irradiated onto the housing cover member 21Z before roughening to form the housing roughened portion 27 in which the housing nanocolumns 29 stand, so that the housing roughened portion 27 at the nanoscale can be easily provided. In addition, in the top plate roughening step S2, the pulsed laser LB is irradiated onto the top plate member 56Z before roughening to form the top plate roughened portion 47 in which the terminal nanocolumns 49 stand, so that the top plate roughened portion 47 at the nanoscale can be easily provided. Then, in the resin molding step S5, the resin material 61 is filled between the housing nanocolumns 29 standing in the housing roughened portion 27, and the resin material 61 is filled between the terminal nanocolumns 49 standing in the top plate roughened portion 47, while molding the resin member 60. Thereby, the sealing performance and the bonding strength between the resin member 60 and the housing cover member 21 and the terminal member 40 can be particularly improved.

[0067] In addition, in the present embodiment, in the terminal forming step S3, after the terminal member 40 is formed, the terminal insertion step S4 is performed to insert the terminal member 40 into the insertion hole 21h of the housing cover member 21, but it is not limited thereto. The formation of the terminal member 40 and the insertion of the terminal member 40 into the insertion hole 21h can also be performed simultaneously. That is, in the terminal forming step S3, the hole inner arrangement portion 55 of the protruding member 57 may be arranged in the insertion hole 21h of the housing cover member 21, and the hole inner arrangement portion 55 and the top plate member 56 may be welded. In this case, the terminal insertion step S4 is not required. Therefore, after the terminal forming step S3, the resin molding step S5 is performed.

[0068] The present invention has been described by way of embodiments, but the present invention is not limited to the embodiments, and of course, it can be appropriately modified and applied without departing from the gist thereof.

Claims

1. An electricity storage device, comprising: A housing member having an insertion through-hole; A terminal member inserted into the insertion through-hole of the housing member; and A resin member that insulates between the housing member and the terminal member, and the resin member contacts the housing member and the terminal member to fix the terminal member to the housing member, The electricity storage device is characterized in that The terminal member has: A terminal top plate portion which is plate-shaped and located outside the housing member; and A terminal protruding portion that extends from the terminal top plate portion toward the inside of the housing member, passes through the insertion through-hole, and penetrates the resin member, The terminal component and the resin component are hermetically sealed only at the top plate roughened portion, wherein, The top plate roughened portion is formed in a belt shape extending over the entire circumference of the terminal top plate portion on the inner surface of the top plate facing the housing member side, and the surface is roughened, The housing member and the resin member are hermetically sealed only at the housing roughened portion, wherein the housing roughened portion is formed in a belt shape extending over the entire circumference of the insertion through-hole on the inner surface of the housing member facing the inside, and the surface is roughened.

2. The electricity storage device according to claim 1, characterized in that Housing nano-columns stand in the housing roughened portion. The housing nano-columns are formed by beaded bonding of particles of the metal forming the housing member into a column shape, and the height is 50 nm or more. Terminal nano-columns stand in the top plate roughened portion. The terminal nano-columns are formed by beaded bonding of particles of the metal forming the terminal member into a column shape, and the height is 50 nm or more. The resin material forming the resin member is filled between the standing housing nano-columns, so that the resin member is hermetically joined to the housing roughened portion, and The resin material is filled between the standing terminal nano-columns, so that the resin member is hermetically joined to the top plate roughened portion.

3. A manufacturing method of an electricity storage device, the electricity storage device comprising: A housing member having an insertion through-hole; A terminal component, which is inserted into the insertion through-hole of the housing component; And A resin member that insulates between the housing member and the terminal member, and the resin member contacts the housing member and the terminal member to fix the terminal member to the housing member, The terminal member has: A terminal top plate portion which is plate-shaped and located outside the housing member; and A terminal protruding portion that extends from the terminal top plate portion toward the inside of the housing member, passes through the insertion through-hole, and penetrates the resin member, The terminal member and the resin member are hermetically sealed only at the top plate roughened portion, wherein The top plate roughened portion is formed in a belt shape extending over the entire circumference of the terminal top plate portion on the inner surface of the top plate facing the housing member side, and the surface is roughened, The housing member and the resin member are hermetically sealed only at the housing roughened portion, wherein the housing roughened portion is formed in an annular shape over the entire circumference of the insertion through-hole on the inner side surface of the housing member facing the inside, and the surface is roughened. The manufacturing method of the power storage device is characterized by comprising: A housing roughening step of subjecting the housing member before roughening to a surface roughening treatment to form the housing roughened portion; A terminal forming step of welding a top plate member forming the terminal top plate portion and a protruding member forming the terminal protruding portion to form the terminal member; A top plate roughening step of subjecting the top plate member before roughening to a surface roughening treatment to form the top plate roughened portion before the terminal forming step; And A resin molding step of molding the resin member that is hermetically joined to the housing roughened portion and the top plate roughened portion in a state where the terminal member is inserted into the insertion through-hole of the housing member.

4. The manufacturing method of the power storage device according to claim 3, wherein Housing nano-columns stand in the housing roughened portion, and the housing nano-columns are formed by beads of particles of the metal forming the housing member being joined in a string shape to form a column shape, and the height is 50 nm or more. Terminal nano-columns stand in the top plate roughened portion, and the terminal nano-columns are formed by beads of particles of the metal forming the terminal member being joined in a string shape to form a column shape, and the height is 50 nm or more. The resin material for forming the resin member is filled between the standing housing nano-columns, so that the resin member is hermetically joined to the housing roughened portion, and The resin material is filled between the standing terminal nano-columns, so that the resin member is hermetically joined to the top plate roughened portion. In the housing roughening step, The pulsed laser is intermittently irradiated on the housing member before roughening in a manner of staggering the irradiation positions, so as to form the housing roughened portion in which the housing nano-columns stand. In the top plate roughening step, The pulsed laser is intermittently irradiated on the top plate member before roughening in a manner of staggering the irradiation positions, so as to form the top plate roughened portion in which the terminal nano-columns stand. In the resin molding step, The resin material is filled between the housing nano-columns standing in the housing roughened portion and between the terminal nano-columns standing in the top plate roughened portion, so as to mold the resin member.

Images