Electrode laminate and battery

Abstract

To provide an electrode laminate in which a protective member disposed on a side surface part is unlikely to peel off, and provide a battery having the electrode laminate in which an interference between a current collecting terminal and the protective member is unlikely to occur and in which a structural efficiency is good.SOLUTION: An electrode laminate 10 is formed by laminating a plurality of preliminary electrode laminates 10', a position of a third and / or fourth side surfaces of the plurality of preliminary electrode laminates do not always coincide with each other in a plane direction of the electrode laminate. (i) A protective member 20 extends to at least a part between the third side surface of the innermost preliminary electrode laminate and the third side surface part of the outermost preliminary electrode laminate, and / or (ii) the protective member extends to at least a part between the fourth side part of the innermost preliminary electrode laminate and the fourth side part of the outermost preliminary electrode laminate. A battery 1 includes: an electrode laminate; and current collecting terminals 30 disposed on third and fourth side surface parts of the electrode laminate.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an electrode stack and a battery. [Background technology]

[0002] As disclosed in Patent Document 1, a battery is known that includes a rectangular electrode laminate, current collecting terminals arranged on a pair of opposing side surfaces of the electrode laminate, and a laminate film that seals the electrode laminate together with the current collecting terminals.

[0003] In order to protect the side surfaces of the electrode laminate in such batteries, a technology has been developed in which a protective member containing a curable resin is provided on the side surfaces of the electrode laminate where no current collecting terminals are located, as disclosed in Patent Document 2. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2022-120699 [Patent Document 2] Japanese Patent Publication No. 2021-114374 Summary of the Invention [Problem to be solved by the invention]

[0005] A protective member containing a curable resin may peel off from the electrode laminate, resulting in a problem that the protective member cannot fully function.

[0006] In order to solve this problem, it is conceivable to extend the protective member up to the side surface of the electrode stack where the current collector terminals are arranged, thereby more firmly fixing the electrode stack and the protective member together.

[0007] However, if the protective member extends to the side surface of the electrode stack where the current collector terminals are located, the current collector terminals and the protective member may interfere with each other. Furthermore, to prevent such interference, excessive space is required between the current collector terminals and the protective member, which reduces the structural efficiency of the battery.

[0008] The present disclosure aims to provide an electrode laminate in which a protective member arranged on a side surface is not easily peeled off, and a battery having such an electrode laminate, in which interference between a current collecting terminal and the protective member is unlikely to occur, and which has good structural efficiency. [Means for solving the problem]

[0009] The present inventors have found that the above problems can be solved by the following means. <Aspect 1> A rectangular electrode laminate having a first side surface portion on which a protective member containing a curable resin is arranged, a second side surface portion facing the first side surface portion, and a third side surface portion and a fourth side surface portion facing the third side surface portion, the electrode stack is formed by stacking a plurality of preliminary electrode stacks, the positions of the third and / or fourth side surface portions of the plurality of preliminary electrode stacks do not coincide with each other in the surface direction of the electrode stacks, (i) the protective member extends to at least a portion between the third side portion of the innermost preliminary electrode stack and the third side portion of the outermost preliminary electrode stack; and / or (ii) the protective member extends to at least a portion between the fourth side surface portion of the innermost preliminary electrode stack and the fourth side surface portion of the outermost preliminary electrode stack; Electrode stack. <Aspect 2> the protective member extends only partially between the third side portion of the innermost preliminary electrode stack and the third side portion of the outermost preliminary electrode stack; and / or the protective member extends only partially between the fourth side surface portion of the innermost preliminary electrode stack and the fourth side surface portion of the outermost preliminary electrode stack. 2. The electrode stack of embodiment 1. <Aspect 3> the distance between the third side surface portion of the innermost preliminary electrode stack and the third side surface portion of the outermost preliminary electrode stack is 0.5 mm or more and 2.0 mm or less; and / or a distance between the fourth side surface portion of the innermost preliminary electrode laminate and the fourth side surface portion of the outermost preliminary electrode laminate is 0.5 mm or more and 2.0 mm or less; 3. The electrode stack according to claim 1 or 2. <Aspect 4> The electrode stack according to any one of aspects 1 to 3, current collecting terminals disposed on the third and fourth side surfaces of the electrode stack; and a laminate film that seals the electrode stack together with the current collecting terminals; A battery having [Effects of the Invention]

[0010] According to the present disclosure, it is possible to provide an electrode laminate in which a protective member arranged on a side surface portion is not easily peeled off, and a battery having such an electrode laminate, in which interference between the current collecting terminal and the protective member is less likely to occur, and which has good structural efficiency. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic plan view (upper side) showing an example of an electrode laminate of the present disclosure when viewed from above in the stacking direction, and a schematic plan view (lower side) showing an example of an electrode laminate of the present disclosure when viewed from below in the stacking direction. [Figure 2] FIG. 2 is a schematic plan view (upper side) showing an example of an electrode laminate according to a comparative example when viewed from above in the stacking direction, and a schematic plan view (lower side) showing an example of an electrode laminate according to a comparative example when viewed from below in the stacking direction. [Figure 3]FIG. 3 is a schematic cross-sectional view showing an example of an electrode laminate according to the present disclosure. [Figure 4] FIG. 4 is a schematic plan view (upper side) showing an example of a battery according to the present disclosure when viewed from above in the stacking direction of the electrode stack, and a schematic plan view (lower side) showing an example of a battery according to the present disclosure when viewed from below in the stacking direction of the electrode stack. [Figure 5] FIG. 5 is a schematic plan view (upper side) showing an example of a battery according to a comparative example when viewed from above in the stacking direction of the electrode stack, and a schematic plan view (lower side) showing an example of a battery according to a comparative example when viewed from below in the stacking direction of the electrode stack. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the present disclosure. Note that the dimensional relationships in the drawings do not reflect the actual dimensional relationships.

[0013] 1 to 5 show an example in which the electrode stack 10 is made up of two preliminary electrode stacks 10', but the number of preliminary electrode stacks 10' is not limited to this.

[0014] <Electrode laminate> As illustrated in Fig. 1, the electrode laminate 10 of the present disclosure has a first side surface portion (S1) on which a protective member 20 containing a curable resin is disposed, a second side surface portion (S2) facing the first side surface portion, and a third side surface portion (S3) and a fourth side surface portion (S4) facing the third side surface portion, and is rectangular in shape. As illustrated in Fig. 3, the electrode laminate 10 of the present disclosure is formed by stacking a plurality of preliminary electrode laminates 10', and the positions of the third and / or fourth side surface portions (S3, S4) of the plurality of preliminary electrode laminates 10' do not coincide with each other in the surface direction of the electrode laminate 10, and (i) the protective member 20 is disposed on the third side surface portion (S I 3) and the third side portion (SO 3), and / or (ii) the protective member 20 extends to at least a portion between the fourth side portion (S I 4) and the fourth side portion (S O 4) and at least a portion of the

[0015] As described above, the protective member 20 containing the curable resin may peel off from the electrode stack 10, which may result in the problem that the protective member 20 is unable to fully function.

[0016] In this regard, the present inventors have come to the present disclosure by noticing that in an electrode stack 10 formed from a plurality of preliminary electrode stacks 10', displacement occurs in the planar direction between each preliminary electrode stack 10'. That is, they have found that peeling of the protective member 20 from the electrode stack 10 can be effectively suppressed by extending the protective member 20 to at least a portion between the third and / or fourth side surface portion of the innermost preliminary electrode stack 10' and the third and / or fourth side surface portion of the outermost preliminary electrode stack 10'.

[0017] This is thought to be because the protective member 20 extends around to the third and / or fourth side portions of the desired preliminary electrode stack 10' other than the outermost preliminary electrode stack 10', thereby being more firmly fixed to the electrode stack 10.

[0018] 1 to 5 illustrate an example in which the electrode laminate 10 is composed of two preliminary electrode laminates 10′. In these figures, for convenience, the side surface of the electrode laminate on which the positive electrode current collector terminal 31 is disposed is designated as the third side surface (S3), and the side surface of the electrode laminate on which the negative electrode current collector terminal 32 is disposed is designated as the fourth side surface (S4). The third side surface (S3) is illustrated as the end surfaces of the negative electrode current collector layer 15, the negative electrode active material layer 14, the electrolyte layer 13, and the positive electrode active material layer 12 on the positive electrode current collector terminal 13 side. In FIGS. 1 to 5, an example in which the positive electrode active material layer 12 is formed smaller than the negative electrode active material layer 14 is illustrated. Therefore, an example in which the planar positions of the layers constituting the electrode laminate 10 do not coincide on the side of the fourth side surface (S4). 1 and 2, the fourth side surface portion (S4) is shown as the end surface of the negative electrode active material layer 14 on the side of the negative electrode current collector terminal 32. The fourth side surface portion (S4) may be the end surface of another layer constituting the electrode laminate 10, for example, the end surface of the positive electrode current collector layer 11. The size of the positive electrode active material layer 12 and the size of the negative electrode active material layer 14 may be the same, and therefore, similar to the third side surface portion (S3), the positions of the layers constituting the electrode laminate 10 in the planar direction may also be the same in the fourth side surface portion (S4).

[0019] 1 and 2, and 4 and 5, the dashed lines a, b, and c indicate the third side surface portion (S O Specifically, the dashed line a indicates the positional relationship in the plane direction with respect to the third side surface portion (S O 3) in the planar direction, and the dashed line b indicates the third side surface portion (S I 3), and the dashed line c indicates the position in the plane direction of the protective member extended to the third side portion (S I 3) indicates the position in the plane direction.

[0020] That is, dashed line a indicates the surface position of the side surface portion of the preliminary electrode stack 10′ on which the positive collector terminal 31 is arranged, which is closest to the positive collector terminal 31, dashed line b indicates the surface position of the protective member 20 extended to the side surface portion of the preliminary electrode stack 10′ on which the positive collector terminal 31 is arranged, and dashed line c indicates the surface position of the side surface portion of the preliminary electrode stack 10′ on which the positive collector terminal 31 is arranged, which is farthest from the positive collector terminal 31.

[0021] 1 and 4 , in the electrode laminate 10 and battery 1 of the present disclosure, the dashed lines are arranged in the order of a, b, and c, starting from the positive current collector terminal 31. That is, of the side surfaces of the preliminary electrode laminate 10′ on which the positive current collector terminal 31 is arranged, position a in the planar direction of the side surface closest to the positive current collector terminal 31 is closer to the positive current collector terminal 31 than position b in the planar direction of the protective member 20 that extends to the side surface of the preliminary electrode laminate 10′ on which the positive current collector terminal 31 is arranged.

[0022] 2 and 5, in the electrode stack 10 and battery 1 according to the comparative example, the dashed lines are arranged in the order b, a, and c, starting from the end where the positive current collector terminal 31 is located. In other words, position b in the planar direction of the protective member 20 extended to the side surface of the preliminary electrode stack 10′ where the current collector terminal 31 is located is closer to the positive current collector terminal 31 than the planar position of the side surface of the preliminary electrode stack 10′ where the positive current collector terminal 31 is located, that is closest to the positive current collector terminal 31.

[0023] 2 and 5, it is expected that the effect of making it difficult for the protective member to peel off from the electrode laminate can also be achieved. However, as described above, when a battery having such an electrode laminate is fabricated, another problem may arise in that the current collecting terminal and the protective member interfere with each other.

[0024] Therefore, the present inventors discovered that by using an electrode laminate and a battery as exemplified in Figures 1 and 4, the protective member is less likely to peel off from the electrode laminate and interference between the current collecting terminal and the protective member is less likely to occur, leading to the present disclosure.

[0025] In the electrode stack 10 of the present disclosure, the positions of the third and / or fourth side surface portions of the plurality of preliminary electrode stacks 10′ do not coincide with one another in the planar direction of the electrode stack 10. In other words, when the electrode stack 10 is viewed from the side of the side surface portion where the protective member is disposed, the preliminary electrode stacks 10′ are misaligned in the planar direction.

[0026] In the electrode stack 10 of the present disclosure, (i) the protective member 20 is attached to the third side surface portion (S i 3) and the third side portion (S o 3), and / or (ii) the protective member 20 extends to at least a portion between the fourth side portion (S i 4) and the fourth side portion (S o 4) and at least a portion of the

[0027] That is, in the case of the above (i), in the electrode stack 10 as exemplified in FIG. 1, the third side surface portion (S o The protective member 20 does not extend to the third side surface portion (S 3) of the lower preliminary electrode stack 10′. i 3) has a protective member 20 extending therefrom.

[0028] In FIG. 1, the fourth side surface portion (S i 4) of the innermost preliminary electrode laminate 10′, the protection member 20 is provided only up to the portion that coincides with the position in the surface direction of the fourth side surface portion (S i 4) and the fourth side portion (S oThe protective member 20 can extend to at least a part of the area between the first and second electrodes 21 and 22. This allows the above embodiment (ii) to be achieved.

[0029] In the electrode stack 10 of the present disclosure, the protective member 20 is attached to the third side surface portion (S i 3) and the third side portion (S o 3) of the innermost preliminary electrode stack 10′, and / or the protective member 20 may extend only partially between the fourth side portion (S i 4) and the fourth side portion (S o 4) and only a part of the third and / or fourth side surface portions. By adopting such a configuration, manufacturing costs can be reduced compared to when the protective member is disposed over the entire surface of the third and / or fourth side surface portions.

[0030] When the electrode stack is formed from three or more preliminary electrode stacks, the protective member may extend to the third and / or fourth side portions of any desired preliminary electrode stack other than the outermost preliminary electrode stack.

[0031] The third side portion (S i 3) and the third side portion (S o 3) of the innermost preliminary electrode stack may be 0.5 mm or more and 2.0 mm or less, and / or the fourth side portion (S i 4) and the fourth side portion (S o The distance D between the third side surface portion (S 4 ) of the innermost preliminary electrode laminate and the third side surface portion (S 5 ) of the innermost preliminary electrode laminate may be 0.5 mm or more and 2.0 mm or less. This distance D may be 0.5 mm or more, 0.6 mm or more, 0.7 mm or more, 0.8 mm or more, 0.9 mm or more, or 1.0 mm or more, and may be 2.0 mm or less, 1.8 mm or less, 1.6 mm or less, 1.4 mm or less, 1.2 mm or less, or 1.0 mm or less. When the distance D is within the above range, the protective member can be easily disposed at a desired position, and therefore peeling of the protective member from the electrode laminate can be effectively prevented. Note that the distance D is set to the distance between the third side surface portion (S 6 ) of the innermost preliminary electrode laminate and the third side surface portion (S 7 ) of the innermost preliminary electrode laminate.i 3) and the third side portion (S o 3) in the vertical direction, or the shortest distance between the fourth side surface (S i 4) and the fourth side portion (S o 4) may be the shortest distance between the object and an imaginary plane extending vertically.

[0032] The configuration of the electrode stack of the present disclosure will be described below.

[0033] As illustrated in FIG. 1, the electrode laminate 10 of the present disclosure has a first side portion (S1) on which a protective member 20 containing a curable resin is arranged, a second side portion (S2) opposite the first side portion, and a third side portion (S3) and a fourth side portion (S4) opposite the third side portion, and is rectangular in shape.

[0034] 3, the electrode laminate 10 is formed by stacking a plurality of preliminary electrode laminates 10'. The electrode laminate 10 may have a positive electrode current collector layer 11, a positive electrode active material layer 12, an electrolyte layer (separator layer) 13, a negative electrode active material layer 14, and a negative electrode current collector layer 15 in this order.

[0035] In the present disclosure, the term "preliminary electrode laminate" refers to a laminate having, in this order, a negative electrode active material layer 14, an electrolyte layer 13, a positive electrode active material layer 12, and a positive electrode current collector layer 11 on both sides of a negative electrode current collector layer 15. That is, the term "preliminary electrode laminate" refers to a laminate having, in this order, a positive electrode current collector layer, a positive electrode active material layer, an electrolyte layer, a negative electrode active material layer, a negative electrode current collector layer, a negative electrode active material layer, an electrolyte layer, a positive electrode active material layer, and a positive electrode current collector layer. Furthermore, the term "electrode laminate" refers to a laminate formed by stacking a plurality of preliminary electrode laminates 10' so that the positive electrode current collector layers 11 are in contact with each other, or a laminate formed by stacking preliminary electrode laminates 10' so that the positive electrode current collector layers 10 are shared between them.

[0036] The preliminary electrode laminate may have layers other than those described above, for example, a carbon layer between the positive electrode current collector layer and the positive electrode active material layer.

[0037] The shape of the portions of the positive electrode current collector layer and the negative electrode current collector layer that extend from the side surfaces of the electrode stack is not particularly limited, and can be appropriately designed, for example, taking into consideration ease of joining to the current collector terminals described below, etc.

[0038] <<Method for manufacturing electrode stack>> The disclosed method for manufacturing an electrode stack includes the following steps: stacking a plurality of preliminary electrode stacks to produce an electrode stack so that the positions of the third and / or fourth side portions do not coincide with each other in the surface direction; applying a curable resin to the first and second side portions of the electrode stack so that the end of the curable resin on the side of the third side portion is located between the third side portion of the innermost preliminary electrode stack and the third side portion of the outermost preliminary electrode stack, and curing the curable resin to position a protective member; and / or applying a curable resin to the first and second side portions of the electrode stack so that the end of the curable resin on the side of the fourth side portion is located between the fourth side portion of the innermost preliminary electrode stack and the fourth side portion of the outermost preliminary electrode stack, and curing the curable resin to position a protective member.

[0039] By using this method, the curable resin can be allowed to penetrate into the third and / or fourth side portions of the desired preliminary electrode laminate other than the outermost preliminary electrode laminate, and by curing this, the protective member is placed in the desired position, thereby obtaining the electrode laminate of the present disclosure.

[0040] In order to more reliably position the protective member on the third and / or fourth side portions of the desired preliminary electrode stack other than the outermost preliminary electrode stack, a curable resin may be applied directly to the third and / or fourth side portions of the desired preliminary electrode stack and then cured.

[0041] "battery" 4 is a schematic plan view (upper side) showing an example of a battery according to the present disclosure when viewed from above in the stacking direction of the electrode laminate, and a schematic plan view (lower side) showing an example of a battery according to the present disclosure when viewed from below in the stacking direction of the electrode laminate. As illustrated in Fig. 4, the battery 1 according to the present disclosure includes the electrode laminate 10 according to the present disclosure, current collecting terminals 30 disposed on the third and fourth side portions of the electrode laminate, and a laminate film 40 that seals the electrode laminate 10 together with the current collecting terminals 30.

[0042] 5 is a schematic plan view (upper side) showing an example of a battery according to a comparative example of the present disclosure when viewed from above in the stacking direction of the electrode stack, and a schematic plan view (lower side) showing an example of a battery according to a comparative example of the present disclosure when viewed from below in the stacking direction of the electrode stack. If an attempt is made to more firmly fix the electrode stack 10 and the protective member 20 by extending the protective member 20 to the side portion where the current collecting terminal 30 of the outermost preliminary electrode stack is located, the current collecting terminal 30 and the protective member 20 may interfere with each other, as exemplified in the upper and lower views of FIG. 5. Furthermore, in order to prevent such interference from occurring, excessive space is required between the current collecting terminal 30 and the protective member 20, which reduces the structural efficiency of the battery.

[0043] In this regard, the present inventors have found that the above problem can be solved by providing a battery having the electrode stack of the present disclosure.

[0044] This is thought to be because, in the electrode stack 10 of the present disclosure, the protective member 20 is positioned inside the side portion on which the current collecting terminal 30 is located of the outermost preliminary electrode stack 10′, i.e., the preliminary electrode stack 10′ that is closest to the current collecting terminal 30, so that the current collecting terminal 30 and the protective member 20 do not interfere with each other, and therefore the battery does not require excessive space between the current collecting terminal 30 and the protective member 20.

[0045] The elements that make up the battery of the present disclosure will be described below.

[0046] <Electrode laminate> For the electrode stack, reference can be made to the above description regarding the electrode stack of the present disclosure.

[0047] <Protective material> The protective member 20 is disposed on a first side surface portion of the electrode stack 10 and a second side surface portion opposite the first side surface portion.

[0048] The protective member includes a curable resin. The curable resin is not particularly limited, but examples thereof include photocurable resins such as ultraviolet curable resins and electron beam curable resins, and thermosetting resins. The curable resin may be a radical polymerizable resin, a cation polymerizable resin, or a combination thereof.

[0049] <Collector terminal> The current collecting terminal 30 is disposed on the third side surface portion of the electrode stack 10 and on a fourth side surface portion opposite the third side surface portion. The current collecting terminal may be electrically connected to the electrode stack by a current collecting portion extending from the third and fourth side surface portions of the electrode stack. The current collecting portion may be a bundle of positive electrode current collecting layers in the electrode stack that are not stacked with other layers, or a bundle of negative electrode current collecting layers in the electrode stack that are not stacked with other layers.

[0050] The material of the current collector terminal is not particularly limited as long as it has a current collecting function, and may be, for example, the same metal material as that of the positive electrode current collector layer and the negative electrode current collector layer.

[0051] The shape, size, etc. of the current collecting terminal are not particularly limited as long as they can seal the electrode stack together with the laminate film.

[0052] <Laminating film> The laminate film 40 seals the electrode laminate 10 together with the current collecting terminal 30. Specifically, the laminate film 40 may be formed by winding the electrode laminate 10 and the current collecting terminal 30, and sealing the electrode laminate 10 together with the current collecting terminal 30. The laminate film 40 may also be composed of first and second films, and in this case, the first and second films may sandwich the electrode laminate 10 and the current collecting terminal 30 from above and below in the stacking direction of the electrode laminate 10, and seal the electrode laminate 10 together with the current collecting terminal 30. The laminate film may have a fusion layer, a metal layer, and a resin layer in this order along the thickness direction.

[0053] <Other components> The battery of the present disclosure may include other components than those described above. For example, an insulating resin may be disposed on the side surface on which the positive electrode current collector terminal is disposed. [Example]

[0054] Example 1 <Preparation of Electrode Laminate> The two preliminary electrode laminates were stacked so that the positions of the side surfaces where the current collecting terminals were arranged did not coincide with each other in the planar direction, thereby obtaining an electrode laminate as shown in FIG.

[0055] <Application of hardening resin> Using a dispenser, the ultraviolet-curable resin was applied to the side surface of the electrode stack where the current collector terminal was not located, so that the end of the curable resin on the side surface where the positive electrode current collector terminal was located was positioned between the side surface of the innermost preliminary electrode stack and the side surface of the outermost preliminary electrode stack.

[0056] <Arrangement of protective components> The applied resin was cured by irradiating it with ultraviolet light, and a protective member was then placed on the resin, thereby obtaining an electrode laminate of Example 1 as shown in FIG.

[0057] <Battery Construction> A current collecting terminal was placed on the side surface of the obtained electrode laminate where the protective member was not placed, and the electrode laminate together with the current collecting terminal was sealed with a laminate film, thereby obtaining a battery of Example 1 as shown in FIG.

[0058] "evaluation" <Protective material is resistant to peeling> The peel resistance of the protective member disposed on the electrode stack was evaluated based on the tensile stress when the protective member was pulled from the end of the side surface on which the positive electrode current collector terminal was disposed. That is, a tensile stress of 200 N or more was evaluated as "◎", a tensile stress of 50 N or more but less than 200 N was evaluated as "◯", and a tensile stress of less than 50 N was evaluated as "×".

[0059] <Whether or not there is interference between the current collecting terminal and the protective member> The presence or absence of interference between the current collecting terminal and the protective member in the battery was evaluated. That is, if the current collecting terminal did not contact the protective member arranged on the electrode stack closest to the current collecting terminal, it was rated as "absent," and if it contacted the protective member, it was rated as "present."

[0060] Comparative Example 1 An electrode laminate and a battery of Comparative Example 1 as shown in FIGS. 2 and 5 were obtained and evaluated in the same manner as in Example 1, except that in the curable resin application step, the curable resin was applied even to the side surface of the outermost preliminary electrode laminate where the positive electrode current collector terminal was to be disposed.

[0061] Comparative Example 2 An electrode laminate and a battery of Comparative Example 2 were obtained and evaluated in the same manner as in Example 1, except that in the curable resin application step, the curable resin was applied to the innermost preliminary electrode laminate on the side surface on which the positive electrode collector terminal was located, i.e., the curable resin was not applied to the side surface on which the positive electrode collector terminal was located of any of the preliminary electrode laminates.

[0062] "result" Table 1 shows the evaluation results of the peel resistance of the protective member and the presence or absence of interference between the current collecting terminal and the protective member.

[0063] [Table 1]

[0064] As shown in Table 1, in the electrode laminate of the example, peeling of the protective member could be sufficiently suppressed, and in the battery of the example, no interference occurred between the current collecting terminal and the protective member. [Explanation of symbols]

[0065] 1 battery 10 Electrode laminate 10' Preliminary electrode stack 11 Positive electrode current collector layer 12 Cathode active material layer 13 Electrolyte layer 14 Negative electrode active material layer 15 Negative electrode current collector layer 20 Protective material 30 Current collector terminal 31 Positive current collecting terminal 32 Negative electrode current collector terminal 40 Laminating Film

Claims

1. A rectangular electrode laminate having a first side surface portion on which a protective member containing a curable resin is disposed, a second side surface portion facing the first side surface portion, and a third side surface portion and a fourth side surface portion facing the third side surface portion, the electrode stack is formed by stacking a plurality of preliminary electrode stacks, the positions of the third and / or fourth side surface portions of the plurality of preliminary electrode stacks do not coincide with each other in a surface direction of the electrode stacks, (i) the protective member extends at least partially between the third side portion of the innermost preliminary electrode stack and the third side portion of the outermost preliminary electrode stack; and / or (ii) the protective member extends to at least a portion between the fourth side surface portion of the innermost preliminary electrode stack and the fourth side surface portion of the outermost preliminary electrode stack; Electrode stack.

2. the protective member extends only partially between the third side portion of the innermost preliminary electrode stack and the third side portion of the outermost preliminary electrode stack; and / or the protective member extends only partially between the fourth side surface portion of the innermost preliminary electrode stack and the fourth side surface portion of the outermost preliminary electrode stack; The electrode stack according to claim 1 .

3. the distance between the third side surface portion of the innermost preliminary electrode stack and the third side surface portion of the outermost preliminary electrode stack is 0.5 mm or more and 2.0 mm or less; and / or a distance between the fourth side surface portion of the innermost preliminary electrode laminate and the fourth side surface portion of the outermost preliminary electrode laminate is 0.5 mm or more and 2.0 mm or less; The electrode stack according to claim 1 .

4. The electrode stack according to any one of claims 1 to 3, current collecting terminals disposed on the third and fourth side surfaces of the electrode stack; and a laminate film that seals the electrode stack together with the current collecting terminals; A battery having

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