power storage device

Abstract

Provided is a power storage device that can prevent an electrode body inside a can body from moving and causing damage to the electrode body, the can body, or the like even when an impact is applied to the power storage device from the outside. A power storage device (1) in which an electrode body (20A, 20B) is housed inside a can body (10) is provided with a movement restriction member (30) that is disposed inside the can body (10) and has an electrode body fixing portion (31) that is fixed to a fixing surface (20Amh, 20Bmh) of a thickness direction outer side surface (20Am2, 20Bm1) of an outer surface (20Am, 20Bm) of the electrode body (20A, 20B) on an outer side (DH1) of the thickness direction (DH) of an electrode plate (21, 23), and a can body fixing portion (33A, 33B) that extends from the electrode body fixing portion (31) and is fixed to the can body (10) to restrict movement of the electrode body (20A, 20B) inside the can body (10).

Description

Technical Field

[0001] This invention relates to an energy storage device that houses electrodes within a tank. Background Technology

[0002] Conventionally, as energy storage devices such as batteries and capacitors, it is known to house electrode bodies within a cylindrical or cubic box-shaped container. The positive and negative terminals of the energy storage device are fixedly disposed within the container in a state of electrical insulation from the container body, and are electrically connected to the electrode bodies within the container body. For example, in Patent Document 1 (see...) Figure 1 Such a battery was disclosed in (etc.).

[0003] Patent Document 1: Japanese Patent Application Publication No. 2021-150052

[0004] In situations where a vehicle equipped with such an energy storage device collides with an object, or where a strong impact is applied to the device from the outside, there is a possibility that the electrodes housed within the tank may shift significantly. This raises concerns about damage to the connection points between the electrodes and the positive and negative terminals, and potential deformation or damage to the electrodes themselves due to collisions with the inner wall of the tank or with internal components that constitute the current-cutting mechanism. Additionally, there are concerns about tank deformation and damage to internal components. Summary of the Invention

[0005] The present invention was made in view of the current situation and provides an energy storage device that can prevent the electrodes inside the tank from moving and causing damage to the electrodes, tank, etc., even if an impact is applied to the energy storage device from the outside.

[0006] One aspect of the present invention for solving the above-mentioned problems relates to an energy storage device having a tank and an electrode body including an electrode plate and housed within the tank, wherein the electrode body has an outer surface including a thickness-direction outer surface located outside the thickness direction of the electrode plate, and the energy storage device further includes a movement limiting member disposed within the tank, the movement limiting member having: an electrode body fixing portion fixed to a fixing surface constituting at least a portion of the thickness-direction outer surface; and a tank fixing portion extending from the electrode body fixing portion and fixed to the tank, thereby limiting the movement of the electrode body within the tank.

[0007] The aforementioned energy storage device includes a movement limiting component, which has the aforementioned electrode fixing part and tank fixing part. Therefore, in this energy storage device, even if an impact is applied to the energy storage device from the outside, the movement of the electrode inside the tank can be limited, thus preventing the electrode from colliding with the inner wall surface of the tank or components such as the current cutting-off mechanism inside the tank, thereby preventing damage to the electrode, the tank, and the components inside the tank.

[0008] The preferred "movement restriction component" has rigidity, thickness, and other dimensions that make it less prone to deformation even when subjected to a strong impact from the outside on the energy storage device. As for its material, insulating resins such as polypropylene, polyethylene, and PET can be cited as examples.

[0009] Furthermore, examples of "energy storage devices" include, for instance, square energy storage devices that house rectangular electrodes within a rectangular box-shaped container, and cylindrical energy storage devices that house cylindrical electrodes within a cylindrical container. Moreover, examples of rectangular electrodes include stacked electrodes where multiple rectangular electrode plates are alternately layered with partitions, and flat, wound electrodes where strip-shaped electrode plates are wound into a flat shape with partitions. In addition to energy storage devices housing only one electrode within a container, examples of energy storage devices housing multiple electrodes within a container can also be cited.

[0010] In addition, as an "electrode plate", for example, in addition to a positive electrode plate having a positive active material layer provided on two main surfaces of the current collector foil and a negative electrode plate having a negative active material layer provided on two main surfaces of the current collector foil, an electrode plate for a bipolar battery having a positive active material layer provided on one main surface of the current collector foil and a negative active material layer provided on the other main surface can also be cited.

[0011] In the case of a stacked electrode body, the "outer surface" of the electrode body includes a pair of main planes (outer surfaces in the thickness direction) located on the outer side of the stacked electrode plates in the thickness direction, and an end face connecting the pair of main planes. In the case of a wound electrode body, in addition to the outer peripheral surface (outer surface in the thickness direction) located around the winding shaft, it also includes axial end faces located on both sides of the winding shaft in the axial direction.

[0012] Furthermore, the "thickness direction outer surface" in the outer surface refers to the surface located on the outer side in the thickness direction of the electrode plate. In the case of a stacked electrode body, the aforementioned pair of main planes correspond to the thickness direction outer surface, and in a wound electrode body, the aforementioned outer peripheral surface corresponds to the thickness direction outer surface. In the case of a flat wound electrode body, the outer peripheral surface (thickness direction outer surface) includes a pair of main planes and a pair of semi-cylindrical surfaces connecting them.

[0013] The "fixed surface" in the outer surface in the thickness direction is the part where the electrode body fixing part of the movement restriction component is fixed. In addition to the entire surface of the outer surface in the thickness direction, it can also be a part of the outer surface in the thickness direction.

[0014] Furthermore, based on the aforementioned energy storage device, the tank may include: a main body component, which is a bottomed cylindrical shape with an opening and houses the electrode body and the movement limiting component; and a lid component, which seals the opening of the main body component, wherein the tank fixing portion of the movement limiting component extends from the electrode body fixing portion toward the corner of the tank formed by the main body component and the lid component, and is fixed to the main body component and the lid component at the corner of the tank.

[0015] In the aforementioned energy storage device, since the tank fixing part of the movement limiting member is fixed to the tank body component and the tank cover component at the corner of the tank body formed by the tank cover component and the tank body component, the tank fixing part does not move at the corner of the tank body. Therefore, it is possible to effectively suppress the movement of the movement limiting member and the electrode body fixed to the movement limiting member within the tank body.

[0016] Furthermore, based on the aforementioned energy storage device, the main body component of the tank may have a locking portion at the corner of the main body that forms the corner of the tank body, which engages with the tank body fixing portion of the aforementioned movement restriction component. The main body component and the lid component of the tank body shall seal the opening of the main body component by means of the lid component of the lid component, and the tank body fixing portion of the aforementioned movement restriction component shall be directly or indirectly fixed between the locking portion at the corner of the main body and the lid component of the lid component.

[0017] In the aforementioned energy storage device, a can lid component is used to seal the opening of the can body component, and a can body fixing component, which restricts movement, is fixed between the engaging portion at the corner of the can body component and the can lid component. Thus, in this energy storage device, the can body fixing component can be fixed to the can body using a simple fixing structure that secures the can body fixing component between the engaging portion of the can body component and the can lid component.

[0018] Furthermore, preferably, based on the aforementioned energy storage device, a first gasket is provided between the can body fixing part of the aforementioned movement restriction member and the engaging part of the corner of the aforementioned can body, and a second gasket is provided between the can body fixing part and the can lid member, wherein the can body member and the can lid member are fixed to the can body fixing part of the aforementioned movement restriction member between the engaging part of the corner of the aforementioned can body and the can lid member by means of the first gasket and the second gasket.

[0019] In the aforementioned energy storage device, the tank body fixing part, which is a movement-limiting component, is fixed between the engaging portion of the tank body component and the tank cover component using a first gasket and a second gasket. By clamping the first gasket and the second gasket in this way, the tank body fixing part can be more reliably fixed to the tank body.

[0020] Furthermore, preferably, based on the energy storage device described in any of the above, the electrode body has a partition sandwiched between the electrode plates and the electrode plates are bonded to the partition.

[0021] In the aforementioned energy storage device, since the electrode plates constituting the electrode body are bonded together with the partition plate, the electrode body inside the tank can easily move when an impact is applied to the energy storage device from the outside. Therefore, the aforementioned effect obtained by using a movement limiting component to restrict the movement of the electrode body is particularly significant. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the battery involved in the embodiment along the longitudinal and transverse directions. Figure 2 Sectional view in direction AA.

[0023] Figure 2 The battery involved in the implementation method is along the lateral and thickness directions. Figure 1 BB-direction sectional view.

[0024] Figure 3 The battery involved in the implementation method Figure 1 An enlarged sectional view of the area near the corner of the tank.

[0025] Figure 4 This is a top view of the movement restriction component involved in the implementation method.

[0026] Explanation of reference numerals in the attached figures

[0027] 1…Battery (energy storage device); 10…Tank body; 10r…Tank body corner; 11…Tank main body component; 11c…Opening; 11r…Tank main body corner; 11rkA, 11rkB…Engaging part; 13…Tank cover component; 20A, 20B…Electrode body; 20Am, 20Bm…Outer surface; 20Am1, 20Bm1…Outer surface in the first thickness direction; 20Am2, 20Bm2…Outer surface in the second thickness direction; 20 Amh, 20Bmh…fixed surface; 21…positive electrode plate; 23…negative electrode plate; 25…partition; 30…movement restriction component; 31…electrode body fixing part; 33A, 33B…can body fixing part; 37A, 37B…first gasket; 39A, 39B…second gasket; 40…positive terminal; 50…negative terminal; DH…thickness direction (electrode plate); DH1…outer side (thickness direction). Detailed Implementation

[0028] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figures 1-3A cross-sectional view of the battery (energy storage device) 1 according to this embodiment is shown. Hereinafter, the longitudinal direction AH, the transverse direction BH, and the thickness direction CH of the battery 1 will be defined as follows: Figures 1-3 The direction shown will be used for explanation. This battery 1 is a square and sealed lithium-ion secondary battery that is installed in vehicles such as hybrid vehicles, plug-in hybrid vehicles, and electric vehicles.

[0029] The battery 1 comprises a canister 10, a pair of electrodes 20A and 20B housed inside the canister 10, a movement limiting component 30, and a positive terminal 40 and a negative terminal 50 supported by the canister 10. Additionally, an electrolyte 60 is contained within the canister 10, a portion of which is immersed in the electrodes 20A and 20B, while a portion accumulates at the bottom of the canister 10. Furthermore, the electrodes 20A and 20B and the movement limiting component 30 are covered by a bag-shaped insulating film 65 with an opening on one side AH1 along the longitudinal direction AH.

[0030] The tank body 10 is a cubic box shape and is made of metal (aluminum in this embodiment). The tank body 10 consists of a bottomed, cylindrical tank body component 11 with an opening 11c on one side AH1 along the longitudinal direction AH, and a rectangular plate-shaped tank cover component 13 welded to seal the opening 11c of the tank body component 11. The tank body component 11 houses the electrode bodies 20A and 20B, which are covered by an insulating film 65, and the movement restriction member 30. On the other hand, the tank cover component 13 is provided with a safety valve (not shown) that breaks open when the internal pressure of the tank body 10 reaches a predetermined pressure. Furthermore, the tank cover component 13 has a liquid injection hole (not shown) that communicates with the inside and outside of the tank body 10, and is airtightly sealed by a sealing member (not shown).

[0031] Furthermore, a positive terminal 40, composed of multiple aluminum components, is fixedly disposed on the can lid component 13 in an insulated state. This positive terminal 40 is connected and conductively connected to the positive electrode tabs 20Ae and 20Be (described later) of the electrode bodies 20A and 20B respectively inside the can body 10, and extends through the can lid component 13 to the outside of the battery. Additionally, a negative terminal 50, composed of multiple copper components, is fixedly disposed on the can lid component 13 in an insulated state. This negative terminal 50 is connected and conductively connected to the negative electrode tabs 20Af and 20Bf (described later) of the electrode bodies 20A and 20B respectively inside the can body 10, and extends through the can lid component 13 to the outside of the battery.

[0032] A pair of electrode bodies 20A and 20B are housed within a container 10, with the movement limiting member 30 (described later) sandwiched between them and overlapping along the thickness direction CH. Each electrode body 20A and 20B is a flat cuboid, formed by stacking multiple rectangular positive electrode plates (electrode plates) 21 and multiple rectangular negative electrode plates (electrode plates) 23 alternately, separated by a rectangular separator 25 made of a porous resin membrane. The positive electrode plates 21 and separator 25, overlapping along the thickness direction DH, are bonded together using adhesives, thereby integrating the electrode bodies 20A and 20B.

[0033] As described above, electrode bodies 20A and 20B are both cuboid in shape, and their outer surfaces 20Am and 20Bm are each composed of approximately six planes. That is, the outer surfaces 20Am and 20Bm are composed of a pair of larger outer surfaces in the first thickness direction DH1 and DH1 located on the outer side DH1 of the thickness direction of the positive electrode plate 21 and the negative electrode plate 23, and a pair of larger outer surfaces in the second thickness direction DH1 and DH2, and four surfaces (upper surface 20Am3, 20Bm3, lower surface 20Am4, 20Bm4, first narrow side surface 20Am5, 20Bm5 and second narrow side surface 20Am6, 20Bm6) connecting these outer surfaces in the first thickness direction DH1, DH1 and the outer surfaces in the second thickness direction DH2, DH2.

[0034] On the outer surface 20Am2 of the outer surface 20Am in the second thickness direction of an electrode body 20A, excluding the surrounding portion (fixed surface 20Amh), a main surface 31a of the electrode body fixing portion 31, which is fixed to the center portion (fixed surface 20Amh) of the outer surface 20Am in the second thickness direction of the outer surface of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am of the outer surface 20Am in the outer surface 20Am in the second thickness direction of the outer surface of the outer surface 20Am ...

[0035] The positive electrode plate 21 has positive electrode active material layers (not shown) on each of the two main surfaces of a positive electrode current collector foil (not shown) made of rectangular aluminum foil. The positive electrode active material layers consist of positive electrode active material particles capable of attracting and releasing lithium ions, conductive particles, and a binder. The protruding portion extending longitudinally towards the side AH1 of the positive electrode plate 21 does not have a positive electrode active material layer in the thickness direction DH; the positive electrode current collector foil becomes the positive electrode exposed portion 21p exposed in the thickness direction DH. Each positive electrode exposed portion 21p overlaps with each other in the thickness direction DH to form the aforementioned positive electrode tabs 20Ae and 20Be. As described above, these positive electrode tabs 20Ae and 20Be are electrically connected to the positive terminal 40.

[0036] The negative electrode plate 23 has negative electrode active material layers (not shown) on each of the two main surfaces of a negative electrode current collector foil (not shown) made of rectangular copper foil. The negative electrode active material layers consist of negative electrode active material particles capable of attracting and releasing lithium ions and a binder. The protruding portion extending longitudinally towards the side AH1 of the negative electrode plate 23 does not have a negative electrode active material layer in the thickness direction DH; the negative electrode current collector foil becomes a negative electrode exposed portion 23p exposed in the thickness direction DH. Each negative electrode exposed portion 23p overlaps with each other in the thickness direction DH to form the aforementioned negative electrode tabs 20Af and 20Bf. As described above, these negative electrode tabs 20Af and 20Bf are electrically connected to the negative terminal 50.

[0037] Next, the movement restriction component 30 will be described (except for...). Figures 1-3 In addition, refer to Figure 4 The movement limiting member 30 is flat and made of insulating resin (polypropylene in this embodiment). The movement limiting member 30 consists of a rectangular plate-shaped electrode body fixing part 31 and two can body fixing parts 33A and 33B extending from the electrode body fixing part 31. Specifically, one can body fixing part 33A extends from the corner 31rA of the electrode body fixing part 31 located on the side BH1 of the transverse BH and the side AH1 of the longitudinal AH towards the can body corner 10r of the can body corner 10r formed by the can body part 11 and the can cover part 13 located on the side BH1 of the transverse BH and the side AH1 of the longitudinal AH. In addition, another tank fixing part 33B extends from the corner 31rB of the electrode body fixing part 31 located on the other side BH2 of the transverse BH and on the side AH1 of the longitudinal AH towards the other side tank corner 10r2 of the aforementioned tank corner 10r located on the other side BH2 of the transverse BH and on the side AH1 of the longitudinal AH.

[0038] Electrode bodies 20A and 20B are fixed to the two main surfaces 31a and 31b of the electrode body fixing part 31, respectively. Specifically, as described above, a fixing surface 20Amh of the second thickness direction outer surface 20Am2 of the outer surface 20Am of the outer surface 20Am of the electrode body 20A is fixed to the main surface 31a of the electrode body fixing part 31, and a fixing surface 20Bmh of the first thickness direction outer surface 20Bm1 of the outer surface 20Bm of the outer surface 20Bm of the other electrode body 20B is fixed to the main surface 31b of the electrode body fixing part 31. Thus, the electrode body fixing part 31 is sandwiched between the two electrode bodies 20A and 20B arranged in the thickness direction CH and becomes integral with these components.

[0039] On the other hand, the can body fixing parts 33A and 33B are fixed to the can body 10, restricting the movement of the electrode bodies 20A and 20B within the can body 10. Specifically, one can body fixing part 33A extends from the corner 31rA of the electrode body fixing part 31 toward one side of the can body corner 10r1, as described above, and is fixed to the can body component 11 and the can lid component 13 within one side of the can body corner 10r1. Similarly, another can body fixing part 33B extends from the corner 31rB of the electrode body fixing part 31 toward the other side of the can body corner 10r2, as described above, and is fixed to the can body component 11 and the can lid component 13 within the other side of the can body corner 10r2.

[0040] Specifically, the corner 11r of the can body component 11, which constitutes the corner 10r of the can body, is provided with engaging portions 11rkA and 11rkB that engage with the can body fixing portions 33A and 33B of the movement limiting member 30, respectively. One engaging portion 11rkA is provided on the side corner 11r1 of the can body component 11r located on one side BH1 of the transverse BH, protruding in a stepped shape to the other side BH2 of the transverse BH, and engaging with the can body fixing portion 33A of the movement limiting member 30 from the other side AH2 of the longitudinal AH. The other engaging portion 11rkB is provided on the side corner 11r2 of the can body component 11r located on the other side BH2 of the transverse BH, protruding in a stepped shape to one side BH1 of the transverse BH, and engaging with the can body fixing portion 33B of the movement limiting member 30 from the other side AH2 of the longitudinal AH.

[0041] Furthermore, first gaskets 37A and 37B, made of insulating resin (polypropylene in this embodiment), are respectively sandwiched between the can body fixing portions 33A and 33B of the movement limiting member 30 and the engaging portions 11rkA and 11rkB of the can body component 11. Also, second gaskets 39A and 39B, made of insulating resin (polypropylene in this embodiment), are sandwiched between the can body fixing portions 33A and 33B of the movement limiting member 30 and the can lid component 13. Moreover, for the can body component 11 and the can lid component 13, the opening 11c of the can body component 11 is sealed by the can lid component 13, and the can body fixing portions 33A and 33B of the movement limiting member 30 are fixed to the can lid component 13 between the engaging portions 11rkA and 11rkB of the can body corner 11r and the can lid component 13 by means of the first gaskets 37A and 37B and the second gaskets 39A and 39B, respectively.

[0042] Thus, the movement limiting member 30 has: an electrode body fixing portion 31, which is fixed to the fixing surfaces 20amh and 20bmh of the electrode bodies 20A and 20B; and a can body fixing portion 33A and 33B, which extend from the electrode body fixing portion 31 and are fixed to the can body 10, thereby limiting the movement of the electrode bodies 20A and 20B within the can body 10. Therefore, in the battery 1 equipped with this movement limiting member 30, since the movement of the electrode bodies 20A and 20B within the can body 10 can be limited even when an impact is applied to the battery 1 from the outside, it is possible to prevent the electrode bodies 20A and 20B from colliding with the inner wall surface of the can body 10, thereby preventing damage to the electrode bodies 20A and 20B themselves, the connection portions of the electrode bodies 20A and 20B with the positive terminal 40 or the negative terminal 50 (positive electrode tabs 20Ae and 20Be, negative electrode tabs 20Af and 20Bf, etc.), and the can body 10.

[0043] Furthermore, in this embodiment, since the can body fixing portions 33A and 33B of the movement limiting member 30 are fixed to the can body component 11 and the can cover component 13 at the can body corner 10r, the can body fixing portions 33A and 33B do not move along the longitudinal direction AH or the transverse direction BH at the can body corner 10r. Therefore, it is possible to effectively suppress the movement of the movement limiting member 30 and the electrode bodies 20A and 20B fixed thereto within the can body 10 along the longitudinal direction AH and the transverse direction BH.

[0044] In this embodiment, the opening 11c of the can body component 11 is sealed by the can lid component 13, and the can body fixing portions 33A and 33B of the movement restriction component 30 are fixed between the engaging portions 11rkA and 11rkB of the can body component 11 and the can lid component 13. Thus, in the battery 1, the can body fixing portions 33A and 33B are fixed to the can body 10 by a simple fixing structure that fixes the can body fixing portions 33A and 33B between the engaging portions 11rkA and 11rkB of the can body component 11 and the can lid component 13.

[0045] Furthermore, the can body fixing portions 33A and 33B of the movement limiting member 30 are fixed between the engaging portions 11rkA and 11rkB of the can body component 11 and the can lid component 13 by means of the first gaskets 37A and 37B and the second gaskets 39A and 39B. By clamping the first gaskets 37A and 37B and the second gaskets 39A and 39B in this way, the can body fixing portions 33A and 33B can be more reliably fixed to the can body 10.

[0046] Furthermore, in this embodiment, since the positive electrode plate 21 and negative electrode plate 23 constituting the electrode bodies 20A and 20B are bonded together with the separator 25, the electrode bodies 20A and 20B inside the canister 10 are easily moved as an integral electrode body when an impact is applied to the battery 1 from the outside. Therefore, the aforementioned effect obtained by restricting the movement of the electrode bodies 20A and 20B with the movement limiting member 30 is particularly significant.

[0047] Next, the manufacturing method of the battery 1 described above will be explained. First, prepare the can cap component 13 and fix the positive terminal 40 and negative terminal 50 thereon (see reference). Figure 1 Additionally, a movement limiting component 30 is prepared, and two additionally formed electrode bodies 20A and 20B are bonded to the two main surfaces 31a and 31b of the electrode body fixing part 31 using adhesive. Next, the positive terminal 40 and negative terminal 50, which are fixedly disposed on the can lid component 13, are welded to the positive electrode tabs 20Ae and 20Be and the negative electrode tabs 20Af and 20Bf of the electrode bodies 20A and 20B, which are fixed to the movement limiting component 30, respectively. Then, the electrode bodies 20A and 20B and the movement limiting component 30 are covered with a bag-shaped insulating film 65.

[0048] Next, prepare the can body component 11, insert the electrode bodies 20A and 20B covered by the insulating film 65 and the movement limiting component 30 into the can body component 11, and seal the opening 11c of the can body component 11 with the can lid component 13. At this time, first gaskets 37A and 37B are respectively placed between the engaging portions 11rkA and 11rkB of the can body component 11 and the can body fixing portions 33A and 33B of the movement limiting component 30, and second gaskets 39A and 39B are respectively placed between the can body fixing portions 33A and 33B of the movement limiting component 30 and the can lid component 13. Thus, the can body fixing portions 33A and 33B of the movement limiting component 30 are fixed between the engaging portions 11rkA and 11rkB of the corner portion 11r of the can body and the can lid component 13 by means of the first gaskets 37A and 37B and the second gaskets 39A and 39B. Then, the can body component 11 and the can lid component 13 are welded around the entire circumference of the can lid component 13 to form the can body 10.

[0049] Next, electrolyte 60 is injected into the tank 10 through the injection hole (not shown) of the tank cap component 13, and then the injection hole is sealed with a sealing component (not shown). Then, the battery 1 undergoes initial charging and various checks. Thus, battery 1 is completed.

[0050] The present invention has been described above according to the embodiments, but the present invention is not limited to the embodiments. It goes without saying that the invention can be applied in a suitable manner without departing from its spirit.

[0051] For example, the embodiment illustrates a method of fixing two electrode bodies 20A, 20B to a movement limiting member 30, but it is not limited to this. It is also possible to prepare two movement limiting members and fix each electrode body 20A, 20B to a movement limiting member separately.

[0052] In addition, in one embodiment, a movement limiting member 30 is sandwiched between the two electrode bodies 20A and 20B, but movement limiting members can also be sandwiched between the electrode bodies 20A and 20B and the tank body 10 respectively.

[0053] In addition, in this embodiment, an adhesive is used to fix the movement limiting member 30 to the electrode bodies 20A and 20B, but the fixing method is not limited to this. For example, a thermoplastic resin such as polyvinylidene fluoride (PVDF) can also be used, and the movement limiting member 30 can be fixed to the electrode bodies 20A and 20B by heating and stamping to achieve thermal fusion.

[0054] In addition, the embodiment illustrates a battery 1 in which two electrode bodies 20A and 20B are housed inside a canister 10, but the number of electrode bodies can be an odd number or more than three.

[0055] In addition, the embodiment illustrates a battery 1 in which stacked electrode bodies 20A and 20B are housed in a canister 10, but the battery can also be constructed by housing flat, wound electrode bodies in a canister instead of these components.

[0056] Furthermore, the embodiment illustrates a battery 1 in which rectangular electrode bodies 20A and 20B are housed within a rectangular box-shaped container 10, but it is not limited to this. Alternatively, a movement limiting member may be fixed to the periphery (outer surface in the thickness direction) of a cylindrical wound electrode body, and these members may be housed within a cylindrical container to form a battery.

Claims

1. An energy storage device (1), the energy storage device (1) having: Tank (10); and The electrode bodies (20A, 20B), including electrode plates (21, 23), are housed within the container (10). Its features are, The electrode body has an outer surface (20Am, 20Bm) including the outer surface (20Am2, 20Bm1) located on the outer side (DH1) in the thickness direction (DH) of the electrode plates (21, 23). The energy storage device also includes a movement restriction component (30) disposed within the tank (10). The movement restriction component (30) has: The electrode body fixing part (31) is fixed to a fixing surface (20Amh, 20Bmh) that constitutes at least a portion of the outer surface (20Am2, 20Bm1) in the thickness direction; and The tank fixing parts (33A, 33B) extend from the electrode fixing parts (31) and are fixed to the tank body (10), restricting the movement of the electrode bodies (20A, 20B) within the tank body (10). The tank (10) has: The main body component (11) is a bottomed cylindrical shape with an opening (11c), and houses the electrode bodies (20A, 20B) and the movement limiting component (30); and The can lid component (13) seals the opening (11c) of the can body component (11). The can body fixing part (33A, 33B) of the movement limiting member (30) extends from the electrode body fixing part (31) toward the can body corner (10r) formed by the can body component (11) and the can cover component (13), and is fixed to the can body component (11) and the can cover component (13) at the can body corner (10r). The main body component (11) has engaging portions (11rkA, 11rkB) at the corner (11r) of the main body component (10r) that engage with the fixed portions (33A, 33B) of the movement limiting component (30). The can body component (11) and the can lid component (13) use the can lid component (13) to block the opening (11c) of the can body component (11), and directly or indirectly fix the can body fixing part (33A, 33B) of the movement limiting component (30) between the engaging part (11rkA, 11rkB) of the corner of the can body (11r) and the can lid component (13).

Images