Battery and energy storage device

Abstract

The invention relates to a battery and an energy storage device. The battery comprises at least two frames which are sequentially stacked and connected along a first direction; the two end plates are connected to the two opposite sides of the at least two frames in the first direction respectively, and a closed space is defined by the two end plates and all the frames; the at least two polar plates and the at least one partition plate are located in the closed space and alternately stacked in the first direction, and the at least two polar plates are fixed to the at least two frames in a one-to-one correspondence mode; the first elastic piece and the second elastic piece are configured to be elastically deformable in the first direction; wherein at least one frame is in elastic sealing connection with the adjacent frame and / or the adjacent end plate through a first elastic piece, and each end plate is in elastic connection with the adjacent polar plate through a second elastic piece. The problems that the internal resistance of the battery is rapidly increased and the battery capacity and the large-current discharge capacity are reduced due to the falling of the positive electrode active layer can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, in particular to a battery and an energy storage device. BACKGROUND

[0002] The bipolar battery is a new type of internal structure battery in chemical batteries, and the core technology is to coat positive and negative active materials on both sides of a substrate with good conductivity to replace the positive and negative two battery plates in the conventional battery structure. Compared with the traditional battery, the bipolar battery can cancel the components such as the pole lug, the pole column, and the internal and external connecting wires, reduce the materials and weight by about 30%, and significantly reduce the internal resistance of the battery and the manufacturing cost of the battery. This technology can be widely applied in lithium, lead, zinc, and nickel-based primary and secondary batteries, and is very suitable for large-current and fast charging and discharging scene applications. It is an ideal new structure battery for electric vehicles and energy storage industries, and has good industrial development prospects.

[0003] The bipolar battery cannot work in a single state due to its structural characteristics, and must be formed into a battery module by overall packaging of two or more single bipolar plates before it can be used by users. Therefore, the overall packaging technology of the bipolar battery is one of the important technologies of the bipolar battery, and has a major impact on the performance of the battery.

[0004] During the charging and discharging process of the positive active material of the lead-based battery, the positive active material will undergo chemical molecular changes. Such chemical changes will cause the positive active material to shrink and expand in volume. However, in the existing packaging technology, the spacing between the layers of bipolar battery plates is fixed during the packaging to form a bipolar battery. When the positive active material shrinks, it is easy to separate from the substrate, causing the internal resistance of the battery to increase rapidly, and the capacity and large-current discharge capability of the battery to decrease significantly. SUMMARY

[0005] Therefore, it is necessary to provide a battery and an energy storage device to improve the above-mentioned defects, in view of the problem that the spacing between the layers of bipolar battery plates is fixed during the packaging of the existing technology, which easily causes the positive active material to fall off, and further causes the capacity and large-current discharge capability of the battery to decrease significantly.

[0006] A battery comprises:

[0007] At least two frames are connected in sequence in a first direction.

[0008] Two end plates are respectively connected to the opposite sides of the at least two frames in the first direction, and together with all the frames form a closed space.

[0009] at least two polar plates and at least one separator, which are located in the closed space and are stacked along the first direction, and each of the at least two polar plates is fixed to the at least two frames correspondingly;

[0010] a first elastic member and a second elastic member, which are configured to be elastically deformed in the first direction;

[0011] The at least one frame is elastically connected to the adjacent frame and / or the adjacent end plate by the first elastic member, and each end plate is elastically connected to the adjacent polar plate by the second elastic member.

[0012] In one embodiment, the first elastic member and the second elastic member are both elastic gaskets.

[0013] In one embodiment, a projection of the first elastic member on a plane perpendicular to the first direction coincides with a projection of the connected frame.

[0014] In one embodiment, the battery further comprises a fastener, all the frames and all the end plates are connected via the fastener, and the fastener applies a fastening force to the two end plates so that each first elastic member and each second elastic member is pressed.

[0015] In one embodiment, the first elastic member fixes the relative position of the adjacent frame and the adjacent separator in a plane perpendicular to the first direction via the fastener.

[0016] In one embodiment, each polar plate comprises an electrically conductive substrate and an active layer disposed on one side of the substrate, the separator is connected between the active layers of two adjacent polar plates, and the polarities of the active layers connected to the same separator are opposite;

[0017] The substrate has an edge portion outside the range of the active layer, and the edge portion is fixed to the frame.

[0018] In one embodiment, each frame is configured with a boss to define one side of the closed space, the edge portion is supported on the boss and is glued to the corresponding frame.

[0019] In one embodiment, the at least two polar plates comprise two single-polarity polar plates and at least one bipolar polar plate, the at least one bipolar polar plate is located between the two single-polarity polar plates in the first direction, and the two single-polarity polar plates are elastically connected to the two end plates via the second elastic member.

[0020] In one of the embodiments, each of the polar plates comprises a substrate and an active layer coated on the substrate; the substrate comprises an acid-resistant insulating layer, a current collecting layer coated on the acid-resistant insulating layer, and a conductor penetrating through the acid-resistant insulating layer and electrically connecting the current collecting layer, and the active layer and the current collecting layer are coated on a side of the current collecting layer away from the acid-resistant insulating layer.

[0021] An energy storage device comprising the above-mentioned battery.

[0022] In the above-mentioned battery, during the charging and discharging process of the battery, when the positive active layer of the polar plate expands in volume, an expansion force that pushes the adjacent separator to micro-displace is generated, and the expansion force acts on the first elastic member and the second elastic member through the separator, the polar plate and the frame, so that the first elastic member and the second elastic member elastically deform in the first direction, at this time, the separator, the polar plate and the frame also micro-displace correspondingly; when the positive active layer of the polar plate shrinks in volume, the frame, the polar plate and the separator that micro-displace reversely micro-displace under the restoring force generated by the first elastic member and the second elastic member, so that the separator is always attached to the shrinking positive active layer, and the positive active layer is always attached to the substrate of the polar plate, thereby avoiding the problem that the positive active layer is easily separated from the substrate and falls into the electrolyte when the positive active layer shrinks, and further avoiding the problems of rapid increase of the internal resistance of the battery, and significant decrease of the capacity of the battery and the large-current discharging capacity. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a structural schematic diagram of a battery in an embodiment of the present application;

[0024] Figure 2 FIG. 2 is a structural schematic diagram of a polar plate in an embodiment of the present application.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] 10, battery; 11, end plate; 12, frame; 121, boss; 13, polar plate; 13a, single-polarity polar plate;

[0027] 13b, bipolar polar plate; 131, substrate; 1311, acid-resistant insulating layer; 1312, current collecting layer; 1313, conductor; 131a, edge portion; 132, active layer; 14, separator; 15, first elastic member; 16, fastener; 161, bolt; 162, nut; 17, second elastic member; a, gluing point. DETAILED DESCRIPTION

[0028] In order to make the above objectives, features and advantages of the present application more clear and understandable, the detailed description of the embodiments of the present application is made below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in many different ways from what is described herein, and with many different combinations of elements, and the present application is not limited to the embodiments described below, and can be practiced with modifications and alterations within the scope of the present application, which are apparent to those skilled in the art.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] In addition, the terms "first", "second", "third" and the like are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" and the like can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0033] It is to be noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right", and the like are merely used for the purpose of explanation and are not intended to be limiting.

[0034] The polar plate mentioned in the embodiments of the present application mainly refers to (but not limited to) a planar polar plate, including a single-polarity polar plate and a bipolar polar plate. The single-polarity polar plate refers to a polar plate including a substrate and a positive active layer or a negative active layer coated on one side of the substrate. The bipolar polar plate refers to a polar plate including a substrate and a positive active layer and a negative active layer respectively coated on two opposite sides of the substrate. Generally, the high capacity of the battery formed by stacking the polar plate and the separator is improved. The battery includes two single-polarity polar plates and at least one bipolar polar plate. The polarities of the two single-polarity polar plates are opposite, and the active layers thereof are oppositely arranged. The bipolar polar plate is located between the two single-polarity polar plates. Of course, in a special example, the battery formed by stacking the polar plate and the separator can only include two single-polarity polar plates. The existing battery is fixedly packaged, and the positive active layer is prone to fall off. In order to solve this problem, the present application provides a battery. The battery provided by the present application is introduced as follows.

[0035] Please refer to Figure 1 In an embodiment of the present application, a battery 10 is provided, which includes two end plates 11, at least two frames 12, at least two polar plates 13, at least one separator 14, a first elastic member 15 and a second elastic member 17. The at least two frames 12 are sequentially stacked along a first direction. The two end plates 11 are respectively connected to two opposite sides of the at least two frames 12 in the first direction, and together with all the frames 12 form a closed space. The at least two polar plates 13 and the at least one separator 14 are located in the closed space and are alternately stacked along the first direction. The at least two polar plates 13 are fixedly connected to the at least two frames 12 one by one. The first elastic member 15 and the second elastic member 17 are both configured to be elastically deformed in the first direction. The at least one frame 12 is elastically and sealingly connected to the adjacent frame 12 and / or the adjacent end plate 11 by the first elastic member 15. Each end plate 11 is elastically connected to the adjacent polar plate 13 by the second elastic member 17.

[0036] The battery 10 is connected by the end plate 11 and the frame 12 to form a sealed space to avoid leakage of the electrolyte injected into the sealed space. The polar plate 13 and the separator plate 14 are stacked alternately and arranged in the sealed space. Each polar plate 13 is fixedly installed on one frame 12 and connected with the end plate 11 on both sides in the stacking direction. At least one frame 12 is elastically sealed and connected with the adjacent frame 12 and / or the end plate 11 by the first elastic member 15. Each end plate 11 is elastically connected with the adjacent polar plate 13 by the second elastic member 17.

[0037] During the charging and discharging process of the battery 10, when the positive active layer 132 of the polar plate 13 expands, an expansion force is generated to push the adjacent separator plate 14 to move slightly. The expansion force acts on the first elastic member 15 and the second elastic member 17 through the separator plate 14, the polar plate 13 and the frame 12, so that the first elastic member 15 and the second elastic member 17 are elastically deformed in the first direction. At this time, the separator plate 14, the polar plate 13 and the frame 12 also move slightly. When the positive active layer 132 of the polar plate 13 shrinks, the frame 12, the polar plate 13 and the separator plate 14 which have moved slightly move reversely under the restoring force generated by the first elastic member 15 and the second elastic member 17, so that the separator plate 14 always adheres to the shrinking positive active layer 132. The positive active layer 132 is always attached to the base plate 131 of the polar plate 13, thereby avoiding the problem that the positive active layer 132 is easily separated from the base plate 131 and falls into the electrolyte when the positive active layer 132 shrinks. In turn, the problems of rapid increase of the internal resistance of the battery, significant decrease of the capacity of the battery and large current discharge capacity are avoided.

[0038] The "at least one frame 12 is elastically sealed and connected with the adjacent frame 12 and / or the adjacent end plate 11 by the first elastic member 15" includes that only part of the frames 12 is elastically sealed and connected with the adjacent frame 12 and / or the adjacent end plate 11 by the first elastic member 15, or all of the frames 12 is elastically sealed and connected with the adjacent frame 12 and / or the adjacent end plate 11 by the first elastic member 15. The specific connection is not limited. When the frame 12 in which the polar plate 13 with the expanding or shrinking positive active layer 132 is not elastically sealed and connected by the first elastic member 15, the expansion force generated by the polar plate 13 acts on the other frame 12 connected with the first elastic member 15 through the frame 12, and the first elastic member 15 is deformed. The expansion force also transmits to the second elastic member 17 through the separator plate 14 and the polar plate 13 to make the second elastic member 17 deformed. When the positive active layer 132 shrinks, the separator plate 14 always adheres to the shrinking positive active layer 132 under the common restoring force of the second elastic member 17 and the first elastic member 15, so that the positive active layer 132 is always attached to the base plate 131 of the polar plate 13, and the positive active layer 132 is prevented from falling off.

[0039] In use, the first direction can be the direction of gravity. The second elastic member 17 connected with the same end plate 11 can be one or more. When there are multiple second elastic members 17 elastically connecting the same end plate 11 and the same polar plate 13, the multiple second elastic members 17 are laid in a plane perpendicular to the first direction.

[0040] Understandably, the frame 12 located in the middle of the stacking direction is adjacent to two frames 12, and at this time it can be elastically and sealingly connected with any one or both of the adjacent frames 12 by the first elastic member 15. The frame 12 located on both sides of the stacking direction is adjacent to one frame 12 and one end plate 11, and at this time it can be elastically and sealingly connected with the adjacent frame 12 and / or the partition plate 14 by the first elastic member 15. When the frame 12 is not elastically and sealingly connected with the adjacent frame 12 and / or the partition plate 14 by the first elastic member 15, other means can be adopted to achieve sealing connection, which is not limited in particular.

[0041] In specific embodiments, the first elastic member 15 and the second elastic member 17 are both elastic gaskets, which are convenient to manufacture and have low cost. Further, the elastic gaskets are made of high-elastic and acid-resistant expanded polytetrafluoroethylene material, and of course, the elastic gaskets can also be made of other materials such as rubber and silicone. Of course, the structure of the first elastic member 15 and the second elastic member 17 can also adopt other forms, such as the structure of elastic sheets and sealing gaskets, which are not limited in particular. The second elastic member 17 can also adopt a different structure from the first elastic member 15. Understandably, the first elastic member 15 is a ring-shaped elastic gasket.

[0042] Further to the embodiments, please refer to Figure 1 In the plane perpendicular to the first direction, the projection of the first elastic member 15 coincides with the projection of the connected frame 12. In this way, it is not necessary to process mounting grooves and other structures on the frame 12 to accommodate the first elastic member 15, and the structure of the frame 12 and its mold are more simplified, which can reduce the processing cost.

[0043] Understandably, the frame 12 and the end plate 11 are insulating members to avoid electric leakage. Preferably, the frame 12 and the end plate 11 are both plastic members, which are low in cost and light in weight. Preferably, the plane shape (perpendicular to the first direction) of the frame 12 and the end plate 11 are both adapted to the plane shape of the polar plate 13. For example, when the polar plate 13 is a square plate, the frame 12 is a square ring-shaped frame 12, and the end plate 11 is a square end plate.

[0044] In some embodiments, please refer to Figure 1The battery 10 further comprises fasteners 16, via which all the side frames 12 and all the end plates 11 are connected, the fasteners 16 exerting a fastening force on the two end plates 11 so that each first elastic member 15 and each second elastic member 17 is compressed. The fasteners 16 can but are not limited to comprise bolts 161 and nuts 162, the bolts 161 being screwed with the nuts 162 after penetrating all the side frames 12 and all the end plates 11 from one side in the first direction, and exerting a fastening force on the end plates 11, under the action of which the first elastic members 15 and the second elastic members 17 are compressed, and the partition plates 14 can be tightly attached to the active layers 132 of the pole plates 13. Understandably, the bolts 161 have a smooth rod section and a threaded section, the smooth rod section penetrating all the side frames 12, and the threaded section penetrating the end plates 11 and the nuts 162. Understandably, the side frames 12 are respectively subjected to a slight displacement along the fasteners 16, and the specific structure of the fasteners 16 is not limited here.

[0045] Further to the embodiments, please refer to Figure 1 The first elastic member 15 is fixed via the fasteners 16 and the relative positions of the adjacent side frame 12 and the adjacent partition plate 14 in the plane perpendicular to the first direction.

[0046] At this time, the fasteners 16 connect the side frames 12 and the partition plates 14 at the same time, and also connect the first elastic members 15, so that the first elastic members 15 can only deform along the first direction and cannot be displaced in the plane perpendicular to the first direction relative to the adjacent side frame 12 and the adjacent partition plate 14, which helps to ensure the stability and sealing reliability of the overall structure. Specifically, the bolts 161 penetrate the side frames 12, the end plates 11 and the first elastic members 15 at the same time, and connect the three through the nuts 162.

[0047] In some embodiments, please refer to Figure 1 Each base plate 131 comprises a base plate 131 capable of conducting electricity and an active layer 132 arranged on one side of the base plate 131, the partition plate 14 is connected between the active layers 132 of the two adjacent base plates 131, and the polarities of the active layers 132 connected to the same partition plate 14 are opposite. Among them, the base plate 131 has an edge part 131a outside the range of the active layer 132, and the edge part 131a is fixed on the side frame 12.

[0048] At this time, the edge part 131a of the base plate 131 of the pole plate 13 is fixedly connected on the side frame 12, which can avoid the active layer 132 being scratched by the side frame 12, and facilitate the installation of the pole plate 13.

[0049] Specifically to the embodiments, please refer to Figure 1The frame 12 is configured to define one side of the sealed space, and the boss 121 is arranged on the frame 12. The edge portion 131a is supported on the boss 121 and is glued to the frame 12. When the polar plate 13 is installed, the edge portion 131a of the polar plate 13 is first supported on the boss 121, and then the edge portion 131a is glued to the frame 12 (for example, as shown in FIG. 11a, the edge portion 131a is glued to the frame 12 at a point a). Figure 1 The edge portion 131a is glued to the frame 12 at the point a, which is convenient for operation.

[0050] Of course, the edge portion 131a can be glued to the frame 12 directly, which is not limited to the above-mentioned scheme.

[0051] Preferably, the edge portion 131a and the boss 121 are arranged around a middle line parallel to the first direction. In this case, the edge portion 131a and the boss 121 are annular, the contact area is large, and the installation stability of the polar plate 13 is better.

[0052] In some embodiments, referring to Figure 1 The at least two polar plates 13 include two single-polarity polar plates 13a and at least one bipolar polar plate 13b. In the first direction, the at least two bipolar polar plates 13b are located between the two single-polarity polar plates 13a, and the two single-polarity polar plates 13a are elastically connected to the two end plates 11 via the second elastic members 17.

[0053] In this embodiment, the battery 10 includes the bipolar polar plate 13b in addition to the two single-polarity polar plates 13a. The bipolar polar plate 13b can realize series connection between the polar plates 13, which not only simplifies the structure but also increases the battery capacity. The two single-polarity polar plates 13a are located on both sides of all the polar plates 13 and are used to electrically connect the positive and negative electrical terminals.

[0054] In some embodiments, referring to Figure 2 Each polar plate 13 includes a substrate 131 and an active layer 132 arranged on the substrate. The substrate 131 includes an acid-resistant insulating layer 1311, a current collecting layer 1312 arranged on the acid-resistant insulating layer 1311, and a conductor 1313 penetrating through the acid-resistant insulating layer 1311 and electrically connected to the current collecting layer 1312. The active layer is arranged on a side of the current collecting layer away from the acid-resistant insulating layer 1311.

[0055] The acid-resistant insulation layer 1311 has corrosion resistance and insulation properties, and can be made of resin such as epoxy resin. Further, glass fibers can be added to the resin to improve corrosion resistance and strength. The current collecting layer 1312 has conductivity, and the material used corresponds to the polarity of the active layer 132 disposed thereon. For example, when the current collecting layer 1312 is disposed on the positive active layer, it can be a lead foil layer. When the current collecting layer 1312 is disposed on the negative active layer, it can be a copper foil layer. The conductor 1313 penetrates the acid-resistant insulation layer 1311 and electrically connects the current collecting layer 1312. The electric charge generated by the active layer 132 is collected by the current collecting layer 1312 and transmitted to the conductor 1313, and the charge transmission between the positive and negative active layers is achieved through the conductor 1313.

[0056] At this time, the acid-resistant insulation layer 1311 constitutes the bottom plate of the substrate 131, which is not conductive. By adding the conductor 1313, the substrate 131 can conduct the positive and negative active layers. Compared with a single-plate conductive substrate 131 such as a titanium plate, the problem of internal short circuit caused by the easy corrosion of the substrate 131 and the formation of penetrating pores inside the battery can be avoided. The conductor 1313 has a conductive function and can be made of copper, titanium, graphite rod, etc.

[0057] Understandably, the bipolar polar plate 13b has active layers 132 disposed on both sides of the substrate 131, and correspondingly, the current collecting layers 1312 are disposed on both sides of the acid-resistant insulation layer 1311. The conductor 1313 electrically connects the current collecting layers 1312 on both sides.

[0058] The assembly process of the above-mentioned battery 10 is as follows: first step: lay the bottom end plate 11; second step: place the second elastic member 17 in the middle of the bottom end plate 11; third step: place the first elastic member 15 on the edge of the bottom end plate 11; fourth step: stack a frame 12 on the first elastic member 15, fix the polar plate 13 on the boss 121 in the frame 12, and fix the polar plate 13 and the frame 12 with glue, and place a separator 14 on the polar plate 13; fifth step: repeat the third step and the fourth step until all the frames 12 are stacked on the bottom end plate 11, and all the polar plates 13 and all the separators 14 are alternately stacked and fixed on the frames 12; sixth step: place the first elastic member 15 on the top frame 12, and place the second elastic member 17 on the top polar plate 13; seventh step: cover the top end plate 11, and fasten all the end plates 11, all the frames 12, and all the first elastic members 15 with fasteners 16.

[0059] The above-mentioned battery 10 can be but is not limited to a lead-based secondary battery 10. Due to the large-area planar polar plate 13, large-capacity energy storage can be achieved.

[0060] In addition, the embodiment of the present application further provides a storage device comprising the battery. Since the storage device comprises the battery, it has all the advantages of the battery, which will not be repeated here. The storage device can be applied in scenarios such as a storage cabinet, an electric vehicle, a ship, a spacecraft, a submarine, etc., which will not be limited here.

[0061] Any combination of the technical features of the above-mentioned embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the present application.

[0062] The above-mentioned embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A battery, characterized by, The battery (10) comprises: at least two side frames (12) connected in sequence and stacked in a first direction; two end plates (11) connected to opposite sides of the at least two side frames (12) in the first direction and enclosing a closed space together with all the side frames (12); at least two polar plates (13) and at least one separator plate (14) located in the closed space and stacked alternately in the first direction, and the at least two polar plates (13) are fixed one by one on the at least two side frames (12); a first elastic member (15) and a second elastic member (17) which are both configured to be elastically deformed in the first direction; wherein the at least one side frame (12) is elastically sealed and connected to the adjacent side frame (12) and / or the adjacent end plate (11) by the first elastic member (15), and each end plate (11) is elastically connected to the adjacent polar plate (13) by the second elastic member (17).

2. The battery of claim 1, wherein, The first elastic member (15) and the second elastic member (17) are both elastic gaskets.

3. The battery of claim 2, wherein, In a plane perpendicular to the first direction, the projection of the first elastic member (15) coincides with the projection of the connected side frame (12).

4. The battery of claim 1, wherein, The battery (10) further comprises a fastener (16) by which all the side frames (12) and all the end plates (11) are connected, and the fastener (16) applies a fastening force to the two end plates (11) so that each first elastic member (15) and each second elastic member (17) is compressed.

5. The battery of claim 4, wherein, The first elastic member (15) is fixed to the relative positions of the adjacent side frame (12) and the adjacent separator plate (14) in a plane perpendicular to the first direction by the fastener (16).

6. The battery of claim 1, wherein, Each polar plate (13) comprises an electrically conductive base plate (131) and an active layer (132) disposed on one side of the base plate (131), the separator plate (14) is connected between the active layers (132) of the adjacent two polar plates (13), and the polarities of the active layers (132) connected to the same separator plate (14) are opposite; wherein the base plate (131) has an edge portion (131a) outside the range of the active layer (132), and the edge portion (131a) is fixed to the side frame (12).

7. The battery of claim 6, wherein, Each side frame (12) is configured with a boss (121) to define one side of the closed space, and the edge portion (131a) is supported on the boss (121) and is glued to the corresponding side frame (12).

8. The battery of claim 6, wherein, The at least two polar plates (13) comprise two unipolar polar plates (13a) and at least one bipolar polar plate (13b) with opposite polarities, and in the first direction, the at least one bipolar polar plate (13b) is located between the two unipolar polar plates (13a), and the two unipolar polar plates (13a) are elastically connected to the two end plates (11) by the second elastic member (17).

9. The battery of claim 1, wherein, Each of the polar plates (13) includes a substrate (131) and an active layer (132) disposed on the substrate; the substrate (131) includes an acid-resistant insulating layer (1311), a current collecting layer (1312) disposed on the acid-resistant insulating layer (1311), and a conductor (1313) penetrating through the acid-resistant insulating layer (1311) and electrically connecting the current collecting layer (1312), and the active layer is disposed on a side of the current collecting layer away from the acid-resistant insulating layer (1311).

10. An energy storage device, characterized by, A battery comprising the electrode as claimed in any one of claims 1 to 9.

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