Liquid storage structure, bipolar pole core, bipolar battery, battery pack and electric equipment

Abstract

The invention provides a liquid storage structure, a bipolar pole core, a bipolar battery, a battery pack and electric equipment, and relates to the technical field of batteries. The liquid storage structure comprises: a support frame; the diaphragm is arranged on one surface of the supporting frame; and the liquid storage part is arranged in the supporting frame, the liquid storage part and the diaphragm are arranged in a spaced mode in the thickness direction of the supporting frame, and the liquid storage part is used for storing the electrolyte and contracts when being subjected to external excitation so as to release the electrolyte. According to the liquid storage structure provided by the embodiment of the invention, the electrolyte is directly injected into the liquid storage part before the liquid storage structure and the pole piece are assembled, so that the liquid injection is relatively simple and convenient, and the liquid injection efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a liquid storage structure, a bipolar electrode core, a bipolar battery, a battery pack and an electrical device. Background Art

[0002] A bipolar battery is a battery composed of bipolar plates, separators and electrolytes, and has advantages such as high voltage, high energy density and high overcurrent capacity.

[0003] In the related art, the bipolar battery further includes a plurality of sequentially arranged frame bodies, and two adjacent frame bodies are buckled and connected. The frame body is a hollow square structural member with a liquid injection hole. The bipolar plate and the separator are located in the hollow position of the frame body, and the bipolar plate and the separator are located between two adjacent frame bodies, and the bipolar plate and the separator are fixed by two adjacent frame bodies. After assembling each frame body, the bipolar plate and the separator, the electrolyte is injected into the bipolar plate through the liquid injection holes on each frame body in sequence, and finally the liquid injection holes are closed in sequence.

[0004] However, the operation of injecting liquid through each liquid injection hole in sequence and then closing each liquid injection hole in sequence is relatively inconvenient. Summary of the Invention

[0005] The present application provides a liquid storage structure, a bipolar electrode core, a bipolar battery, a battery pack and an electrical device to solve the problem that the operation of injecting liquid through each liquid injection hole in sequence and then closing each liquid injection hole in sequence in the prior art is relatively inconvenient.

[0006] In a first aspect, a liquid storage structure provided by the present application includes:

[0007] A support frame;

[0008] A separator, the separator is arranged on one surface of the support frame;

[0009] A liquid storage member, the liquid storage member is arranged in the support frame, and the liquid storage member and the separator are spaced apart along the thickness direction of the support frame. The liquid storage member is used for storing electrolyte, and the liquid storage member is configured to contract when being externally excited to release the electrolyte.

[0010] In some possible implementation manners, the liquid storage member is a heat shrinkable member, and the liquid storage member is configured to contract when the temperature is greater than or equal to a preset temperature.

[0011] In some possible implementation manners, the liquid storage member is a porous material member.

[0012] In some possible implementation manners, the porosity of the liquid storage member is greater than or equal to 90%.

[0013] In some possible embodiments, the liquid storage member is annular, and the outer side of the liquid storage member is connected to the inner side of the support frame.

[0014] In some possible embodiments, the support frame includes a support member, a first adhesive member, and a second adhesive member. The first adhesive member and the second adhesive member are disposed on two opposite surfaces of the support member. At least one of the inner side of the support member and the inner side of the first adhesive member is connected to the liquid storage member, and the peripheral side of the diaphragm is adhered to a surface of a part of the second adhesive member facing away from the support member.

[0015] In some possible embodiments, the support member includes a limiting portion and a support portion disposed on one side of the limiting portion. The first adhesive member and the second adhesive member are adhered to two opposite surfaces of the limiting portion, and the limiting portion is disposed on the outer side of the support portion.

[0016] In some possible embodiments, the side of the first adhesive member facing the liquid storage member, the side of the second adhesive member facing the liquid storage member, and the side of the support portion facing the liquid storage member are flush.

[0017] In some possible embodiments, the limiting portion has two side surfaces oppositely disposed along the thickness direction of the support frame, and the two side surfaces are respectively flush with a surface of the first adhesive member facing away from the support portion and a surface of the second adhesive member facing away from the support portion.

[0018] In a second aspect, the present application provides a bipolar electrode core, including a positive electrode sheet, a negative electrode sheet, at least one bipolar electrode sheet, and at least two liquid storage structures according to any one of the first aspects above;

[0019] The positive electrode sheet, the bipolar electrode sheet, and the negative electrode sheet are sequentially disposed along a preset direction. The liquid storage structure is clamped between the positive electrode sheet and the bipolar electrode sheet, and / or the liquid storage structure is clamped between the negative electrode sheet and the bipolar electrode sheet.

[0020] In some possible embodiments, the bipolar electrode sheet includes a first current collector, a first positive electrode dressing portion, and a first negative electrode dressing portion. The first positive electrode dressing portion and the first negative electrode dressing portion are respectively disposed on two opposite surfaces of the first current collector;

[0021] Two opposite surfaces of the first current collector are correspondingly connected to the support frames of the two liquid storage structures. One of the first positive electrode dressing portion and the first negative electrode dressing portion abuts against the diaphragm of one liquid storage structure, and causes a part of the diaphragm to move towards the liquid storage member of the liquid storage structure, and the other is immersed in the electrolyte released by the liquid storage member of the other liquid storage structure.

[0022] In some possible embodiments, the positive projection of the first positive electrode dressing portion in the preset direction is located inside the positive projection of the support frame in the preset direction, and / or, the positive projection of the first negative electrode dressing portion in the preset direction is located inside the positive projection of the support frame in the preset direction.

[0023] In some possible embodiments, the positive projection of the separator on the first current collector is entirely located on the first current collector.

[0024] In some possible embodiments, the positive electrode sheet includes a second current collector and a second positive electrode dressing portion provided on the second current collector, and the negative electrode sheet includes a third current collector and a second negative electrode dressing portion provided on the third current collector;

[0025] The second current collector and the third current collector are connected to the support frames of the two liquid storage structures, and one of the second positive electrode dressing portion and the second negative electrode dressing portion abuts against the separator of one liquid storage structure, causing part of the separator to move towards the liquid storage member of the liquid storage structure, and the other is immersed in the electrolyte released by the liquid storage member of the other liquid storage structure.

[0026] In a third aspect, the present application provides a bipolar battery, including: a housing and any one of the bipolar electrode cores in the second aspect above, and the bipolar electrode core is located inside the housing.

[0027] In a fourth aspect, the present application provides a battery pack, including: an outer shell and the bipolar battery in the third aspect above, and the bipolar battery is located inside the outer shell.

[0028] In a fifth aspect, the present application provides an electrical device, including: a device body, and the bipolar battery in the third aspect above or the battery pack in the fourth aspect above provided on the device body.

[0029] A liquid storage structure, a bipolar electrode core, a bipolar battery, a battery pack and an electrical device provided by the present application. The liquid storage structure supports the liquid storage member and the separator by providing a support frame. The electrolyte is stored by the liquid storage member, and after assembling the liquid storage structure with the electrode sheet, an external excitation is applied to cause the liquid storage member to contract and release the electrolyte, so that the electrode sheet can be immersed in the electrolyte. Compared with the prior art in which the electrolyte is injected through the liquid injection hole on the plate frame and then the liquid injection hole is sealed after assembly, the liquid storage structure provided by the embodiments of the present application can directly inject the electrolyte into the liquid storage member before assembling the liquid storage structure with the electrode sheet to store the electrolyte by the liquid storage member. The liquid injection is relatively simple and convenient, and the liquid injection efficiency is improved. Description of the Drawings

[0030] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0031] Figure 1 Schematic structural diagram of the liquid storage structure provided for the embodiments of this application;

[0032] Figure 2 is Figure 1 Schematic structural diagram of another perspective;

[0033] Figure 3 is Figure 2 Partial sectional view taken along A-A in

[0034] Figure 4 Schematic diagram of the liquid storage structure provided for the embodiments of this application in the hot pressing state;

[0035] Figure 5 Schematic diagram of the completion of hot pressing of the liquid storage structure provided for the embodiments of this application;

[0036] Figure 6 Schematic structural diagram of the bipolar electrode core provided for the embodiments of this application;

[0037] Figure 7 is Figure 6 Explosion schematic diagram of

[0038] Figure 8 is Figure 6 Partial sectional view of the bipolar electrode core in

[0039] Through the above accompanying drawings, specific embodiments of this application have been shown, and there will be more detailed descriptions hereinafter. These accompanying drawings and textual descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments.

[0040] Explanation of reference numerals:

[0041] 10 - Electrolyte;

[0042] 100 - Liquid storage structure;

[0043] 110 - Support frame; 111 - Support member; 112 - Limiting portion; 113 - Support portion; 114 - First adhesive member; 115 - Second adhesive member;

[0044] 120 - Diaphragm;

[0045] 130 - Liquid storage member;

[0046] 200 - Bipolar electrode plate; 210 - First current collector; 220 - First positive electrode dressing portion; 230 - First negative electrode dressing portion;

[0047] 300 - Positive electrode plate; 310 - Second current collector; 320 - Second positive electrode dressing part;

[0048] 400 - Negative electrode plate; 410 - Third current collector; 420 - Second negative electrode dressing part. Detailed implementation manners

[0049] Exemplary embodiments will be described in detail below, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0050] In the prior art, a bipolar battery further includes a plurality of sequentially arranged plate frames, and two adjacent plate frames are snap - connected. The plate frame is a hollow square structural member with a liquid injection hole. The bipolar electrode plate and the separator are located in the hollow position of the plate frame, and the bipolar electrode plate and the separator are located between two adjacent plate frames, and the bipolar electrode plate and the separator are fixed by two adjacent plate frames. After assembling each plate frame, the bipolar electrode plate, and the separator, electrolyte is injected into the bipolar electrode plate through the liquid injection holes on each plate frame in sequence. After the injection is completed, each liquid injection hole is closed in sequence. However, the operation of injecting electrolyte through the liquid injection holes in sequence and then closing the liquid injection holes in sequence is inconvenient, and the time required is relatively long, resulting in low production efficiency of the bipolar battery. In addition, in order to provide a liquid injection hole on the plate frame, the plate frame needs to have a relatively large thickness, resulting in a relatively large thickness and volume of the bipolar battery, and thus a relatively small energy density of the bipolar battery. At the same time, the liquid injection holes provided on the plate frame are also relatively small, and it is inconvenient to inject electrolyte into each bipolar electrode plate through the liquid injection holes.

[0051] Based on this, the embodiments of the present application provide a liquid storage structure, which supports the liquid storage member and the separator by providing a support frame. The electrolyte is stored in the liquid storage member, and after assembling the liquid storage structure with the electrode plate, an external excitation is applied to cause the liquid storage member to contract and release the electrolyte, so that the electrode plate can be immersed in the electrolyte. Compared with the prior art of injecting electrolyte through the liquid injection holes on the plate frame and then closing the liquid injection holes after assembly, the liquid storage structure provided by the embodiments of the present application can directly inject electrolyte into the liquid storage member before assembling the liquid storage structure with the electrode plate to store the electrolyte in the liquid storage member. The injection is relatively simple and convenient, improving the injection efficiency.

[0052] The embodiments of the present application will be described below with reference to the drawings.

[0053] Refer to Figures 1 to 5, the liquid storage structure 100 provided by the present application includes: a support frame 110, a diaphragm 120, and a liquid storage member 130. The diaphragm 120 is disposed on one side of the support frame 110. The liquid storage member 130 is disposed within the support frame 110, and the liquid storage member 130 and the diaphragm 120 are spaced apart along the thickness direction of the support frame 110. The liquid storage member 130 is used to store the electrolyte 10, and the liquid storage member 130 is configured to contract when subjected to an external stimulus to release the electrolyte 10.

[0054] Among them, the support frame 110 is an annular frame. The circumferential side of the diaphragm 120 is connected to one side of the support frame 110. In the thickness direction of the support frame 110, there is a certain distance between the liquid storage member 130 and the diaphragm 120 to prevent the liquid storage member 130 from contacting the diaphragm 120 when the liquid storage structure 100 is not in use, thereby preventing ions in the electrolyte 10 stored in the liquid storage member 130 from moving through the diaphragm 120 when the liquid storage structure 100 is not in use. In the thickness direction of the support frame 110, the orthographic projection of the liquid storage member 130 is entirely located on the diaphragm 120. Specifically, the thickness direction of the support frame 110 is Figure 3 the direction indicated by the arrow in

[0055] Compared with the prior art where a liquid injection hole is provided on a plate frame, the thickness of the support frame 110 in the embodiments of the present application does not need to be limited by the size of the liquid injection hole. The support frame 110 can be provided with a smaller thickness, so that the thickness of the liquid storage structure 100 is smaller, which is beneficial to improving the energy density of the battery. Exemplarily, the thickness of the support frame 110 can be 0.3 mm - 0.5 mm.

[0056] In the embodiments of the present application, the electrolyte 10 is a liquid electrolyte to ensure that when the liquid storage member 130 contracts, the electrolyte 10 can smoothly escape from the liquid storage member 130.

[0057] The liquid storage structure 100 is configured to be disposed between two electrode plates, one of the electrode plates has a positive electrode dressing, and the other electrode plate has a negative electrode dressing. Opposite sides of the support frame 110 are correspondingly connected to the two electrode plates. The positive electrode dressing and the negative electrode dressing are respectively located on opposite sides of the diaphragm 120 to prevent the positive electrode dressing and the negative electrode dressing from directly contacting and causing a short circuit. At the same time, one of the positive electrode dressing and the negative electrode dressing abuts against the diaphragm 120 and pushes the diaphragm 120 towards the liquid storage member 130. Finally, an external stimulus is applied to the liquid storage structure 100 to cause the liquid storage member 130 to contract under the action of the external stimulus and release the stored electrolyte 10. At this time, the electrolyte 10 can fully infiltrate the gaps between the positive electrode dressing and the diaphragm 120 and between the negative electrode dressing and the diaphragm 120, thereby constructing a channel for ions to transfer between the positive electrode dressing and the negative electrode dressing and realizing the transfer of charge between the positive electrode dressing and the negative electrode dressing.

[0058] The support frame 110 and the two electrode plates can jointly define a liquid storage cavity, and the electrolyte 10 is located in the liquid storage cavity. By providing the support frame 110, the support frame 110 has high stiffness and is not easily deformed, thereby making the liquid storage structure 100 not easily deformed. When the liquid storage structure 100 is arranged between the two electrode plates, the accuracy of the position and shape of the liquid storage structure 100 can be ensured, and short circuit caused by direct contact between the edges of the two electrode plates can be avoided.

[0059] It can be understood that the external excitation includes electric field excitation, magnetic field excitation, temperature excitation, etc. The electrode plate can be at least one of the bipolar electrode plate 200, the positive electrode plate 300, and the negative electrode plate 400.

[0060] For the liquid storage structure 100 provided by the embodiment of the present application, the support frame 110 is provided to support the liquid storage member 130 and the separator 120. The electrolyte 10 is stored by the liquid storage member 130, and after the liquid storage structure 100 is assembled with the electrode plate, an external excitation is applied to cause the liquid storage member 130 to contract and release the electrolyte 10, so that the electrode plate can be immersed in the electrolyte 10. Compared with the prior art in which the electrolyte 10 is injected through the liquid injection hole on the plate frame and then the liquid injection hole is closed after assembly, for the liquid storage structure 100 provided by the embodiment of the present application, the electrolyte 10 is directly injected into the liquid storage member 130 before the liquid storage structure 100 is assembled with the electrode plate to store the electrolyte 10 by the liquid storage member 130, and the liquid injection is relatively simple and convenient, improving the liquid injection efficiency.

[0061] In some embodiments, the liquid storage member 130 is a heat shrinkable member, and the liquid storage member 130 is configured to contract when the temperature is greater than or equal to a preset temperature.

[0062] Wherein, the temperature can refer to the local temperature of the liquid storage member 130 itself or the ambient temperature on the periphery of the liquid storage member 130. The preset temperature needs to be less than the maximum temperature that the support frame 110, the separator 120, and the electrolyte 10 can withstand.

[0063] Exemplarily, the liquid storage member 130 can be made of a heat-sensitive material. The preset temperature can be specifically set adaptively according to actual needs, and this embodiment does not limit it here.

[0064] Specifically, during assembly, first place the liquid storage structure 100 between the two electrode plates, and the liquid storage structure 100 and the electrode plates are stacked in sequence along the thickness direction of the support frame 110, and then the periphery of the electrode plate is hot-pressed. The heat of the hot pressing can be transferred to the periphery of the liquid storage member 130 to increase the ambient temperature on the periphery of the liquid storage member 130. When the ambient temperature on the periphery of the liquid storage member 130 rises to the preset temperature, the liquid storage member 130 undergoes volume contraction, so that the electrolyte 10 can escape from the liquid storage member 130 to the liquid storage cavity and quickly flow to the separator 120 through capillary action.

[0065] In specific implementation, the liquid storage member 130 is a porous material member, so that the liquid storage member 130 can absorb and store the electrolyte 10 and release the electrolyte 10 when shrinking. At the same time, it is more convenient for the liquid storage member 130 to absorb and store the electrolyte 10, and the efficiency of injecting the liquid into the liquid storage member 130 is relatively high.

[0066] Exemplarily, the liquid storage member 130 can be made of a polymer material. The overall shrinkage rate of the liquid storage member 130 can be greater than 80%.

[0067] In some embodiments, the porosity of the liquid storage member 130 is greater than or equal to 90%.

[0068] Wherein, after the liquid storage member 130 finishes shrinking, the volume shrinkage rate of the liquid storage member 130 can be greater than 90%. In this way, the liquid storage member 130 can absorb a large amount of the electrolyte 10, and the electrolyte 10 is not likely to escape in the liquid storage member 130.

[0069] Referring to Figure 4 and Figure 5 , in some embodiments, the liquid storage member 130 is annular, and the outer side of the liquid storage member 130 is connected to the inner side of the support frame 110.

[0070] In this way, when the temperature is greater than or equal to the preset temperature, the liquid storage member 130 can shrink towards the support frame 110, that is, shrink along the direction indicated by the dashed arrow in Figure 4 . Furthermore, the electrolyte 10 released by the liquid storage member 130 can be all located inside the liquid storage member 130, which is convenient for the electrolyte 10 to contact the electrode plate, and at the same time, the influence of the liquid storage member 130 on the charge and discharge of the subsequent battery can be reduced.

[0071] Exemplarily, the outer side of the liquid storage member 130 can be adhesively bonded to the inner side of the support frame 110.

[0072] In some examples, the support frame 110 is a rectangular frame, the liquid storage member 130 is also rectangular, and the outer peripheral side of the liquid storage member 130 matches the inner peripheral side of the support frame 110. The center of the orthographic projection of the support frame 110 in the preset direction, the center of the orthographic projection of the separator 120 in the preset direction, and the center of the orthographic projection of the liquid storage member 130 in the preset direction are located on the same straight line, and this straight line extends along the preset direction.

[0073] Referring to Figure 2 and Figure 3 , in some embodiments, the support frame 110 includes a support member 111, a first adhesive member 114, and a second adhesive member 115. The first adhesive member 114 and the second adhesive member 115 are arranged on two opposite surfaces of the support member 111. At least one of the inner side of the support member 111 and the inner side of the first adhesive member 114 is connected to the liquid storage member 130, and the peripheral side of the separator 120 is adhesively bonded to one side of the part of the second adhesive member 115 facing away from the support member 111.

[0074] Among them, the first bonding member 114 and the second bonding member 115 are arranged along the thickness direction of the support frame 110. The support member 111 is used to support the first bonding member 114 and the second bonding member 115. By arranging the first bonding member 114 and the second bonding member 115, the connection between the liquid storage structure 100 and the electrode plate is made more convenient, the complexity of the electrode core assembly is reduced, and the assembly of the electrode core is made simpler and more convenient.

[0075] Specifically, after the liquid storage structure 100 is clamped between two electrode plates, the peripheral sides of the liquid storage structure 100 and the electrode plates are subjected to hot pressing treatment by a hot head, so that the first bonding member 114 and the second bonding member 115 are respectively bonded to the two electrode plates, and then the liquid storage structure 100 can be bonded between the two electrode plates. At the same time, the heat during the hot pressing process is transferred to the peripheral side of the liquid storage member 130, causing the liquid storage member 130 to undergo volume shrinkage to release the stored electrolyte 10. The first bonding member 114 and the second bonding member 115 are bonded to the electrode plates to seal the liquid storage cavity, and the electrolyte 10 is located in the sealed liquid storage cavity.

[0076] The outer peripheral side of the liquid storage member 130 is bonded to the inner side of the support member 111 and the inner side of the first bonding member 114, and the liquid storage member 130 is supported by the support member 111 and the first bonding member 114. The peripheral side of the separator 120 covers a part of the second bonding member 115, so that the separator 120 is bonded to the second bonding member 115, and at the same time, the separator 120 does not affect the bonding between the second bonding member 115 and the electrode plate.

[0077] Exemplarily, the width of the part of the separator 120 covering the second bonding member 115 can be 3 mm.

[0078] Exemplarily, the support member 111 is made of a polymer material that can maintain a relatively high stiffness at room temperature and does not shrink at the hot pressing temperature. At least part of the first bonding member 114 and at least part of the second bonding member 115 are made of a heat-meltable polymer material, so that the first bonding member 114 and the second bonding member 115 can be bonded to the metal under the action of hot pressing.

[0079] In some examples, the surface of the liquid storage member 130 facing the separator 120 is flush with the surface of the support member 111 facing the second bonding member 115. The surface of the liquid storage member 130 facing away from the separator 120 is flush with the surface of the first bonding member 114 facing away from the support member 111.

[0080] Refer to Figure 2 and Figure 3In a specific implementation, the support member 111 includes a limiting portion 112 and a supporting portion 113 arranged on one side of the limiting portion 112 , the first adhesive member 114 and the second adhesive member 115 are bonded to two opposite sides of the limiting portion 112 , and the limiting portion 112 is arranged on the outer side of the supporting portion 113 .

[0081] The first adhesive member 114, the support portion 113 and the second adhesive member 115 are sequentially arranged along the thickness direction of the limiting portion 112. The support portion 113 is arranged in the middle region of the thickness direction of the limiting portion 112. The support portion 113 is arranged to support the first adhesive member 114 and the second adhesive member 115, so as to avoid short circuit caused by excessive adhesive amount of the first adhesive member 114 and the second adhesive member 115 during hot pressing.

[0082] Exemplarily, the surfaces of the first adhesive member 114 and the second adhesive member 115 both have ceramic glue.

[0083] Reference Figure 3 In some embodiments, the side of the first adhesive 114 facing the liquid storage member 130 , the side of the second adhesive 115 facing the liquid storage member 130 , and the side of the support portion 113 facing the liquid storage member 130 are flush.

[0084] The first adhesive 114 and the second adhesive 115 are flush with the side of the support 113 facing the limiting portion 112. The first adhesive 114 and the second adhesive 115 are both connected to the limiting portion 112.

[0085] Exemplarily, the thickness of the limiting portion 112 is the thickness of the supporting frame 110. The thickness of the supporting portion 113 is 20% of the thickness of the limiting portion 112, and the sum of the thickness of the first adhesive member 114 and the thickness of the second adhesive member 115 is 80% of the thickness of the limiting portion 112, so as to improve the reliability of the bonding between the first adhesive member 114 and the second adhesive member 115. The thickness of the first adhesive member 114 may be equal to the thickness of the second adhesive member 115.

[0086] Exemplarily, the width of the limiting portion 112 may be 3 mm-5 mm.

[0087] Reference Figure 3 In some embodiments, the limiting portion 112 has two side surfaces that are oppositely disposed along the thickness direction of the support frame 110, and the two side surfaces are respectively flush with a side of the first adhesive member 114 that is away from the support portion 113 and a side of the second adhesive member 115 that is away from the support portion 113. In this way, the two opposite surfaces of the support frame 110 disposed along the thickness direction of the support frame 110 can be both planes, which facilitates the bonding of the first adhesive member 114 and the second adhesive member 115 to the electrode piece.

[0088] Exemplarily, the separator 120 can be a rectangular thin sheet.

[0089] Furthermore, in the thickness direction of the support frame 110, the surface of the liquid storage member 130 facing away from the separator 120 is flush with the surface of the first adhesive member 114 facing away from the support portion 113. Thus, the first adhesive member 114 can limit the electrolyte 10 stored in and released from the liquid storage member 130, preventing the electrolyte 10 from escaping.

[0090] Referring to Figure 6 、 Figure 7 and Figure 8 , based on the above embodiments, an embodiment of the present application provides a bipolar electrode core, including a positive electrode plate 300, a negative electrode plate 400, at least one bipolar electrode plate 200, and at least two liquid storage structures 100 in any of the above embodiments. The positive electrode plate 300, the bipolar electrode plate 200, and the negative electrode plate 400 are arranged in sequence along a preset direction. The liquid storage structure 100 is clamped between the positive electrode plate 300 and the bipolar electrode plate 200, and / or the liquid storage structure 100 is clamped between the negative electrode plate 400 and the bipolar electrode plate 200.

[0091] Among them, the specific structure of the liquid storage structure 100 has been described in detail in the above embodiments and will not be elaborated here.

[0092] The positive electrode plate 300 is arranged at one end in the preset direction, the negative electrode plate 400 is arranged at the other end in the preset direction, and the bipolar electrode plate 200 is arranged between the positive electrode plate 300 and the negative electrode plate 400. The preset direction is the same as the thickness direction of the liquid storage structure 100, and is also the same as the thickness directions of the positive electrode plate 300 and the negative electrode plate 400. Specifically, the preset direction is the direction indicated by the arrow in Figure 7 .

[0093] Furthermore, the positive projection of the positive electrode plate 300 in the preset direction, the positive projection of the negative electrode plate 400 in the preset direction, the positive projection of the bipolar electrode plate 200 in the preset direction, and the positive projection of the liquid storage structure 100 in the preset direction are all rectangles. The centers of the positive projections of the positive electrode plate 300, the negative electrode plate 400, the bipolar electrode plate 200, and the liquid storage structure 100 in the preset direction are located on the same straight line, and this straight line extends along the preset direction.

[0094] Exemplarily, the bipolar electrode core includes a bipolar electrode plate 200 and two liquid storage structures 100. The positive electrode plate 300, the liquid storage structure 100, the bipolar electrode plate 200, the liquid storage structure 100, and the negative electrode plate 400 are stacked in sequence along a preset direction, and the first adhesive member 114 and the second adhesive member 115 of the liquid storage structure 100 are in corresponding contact with the positive electrode plate 300, the negative electrode plate 400, and the bipolar electrode plate 200. The peripheral sides of the positive electrode plate 300 and the negative electrode plate 400 have heat-sealing areas. The heat-sealing areas are heat-pressed to heat-seal the peripheral side of the bipolar electrode core. Furthermore, the first adhesive member 114 and the second adhesive member 115 can be adhesively bonded to the positive electrode plate 300, the negative electrode plate 400, and the bipolar electrode plate 200 under the action of heat pressing. At the same time, the temperature of heat pressing can be transmitted to the peripheral side of the liquid storage member 130, so that the ambient temperature on the peripheral side of the liquid storage member 130 rises to a preset temperature. Furthermore, the liquid storage member 130 can shrink, releasing the electrolyte 10. The electrolyte 10 contacts the positive electrode plate 300, the negative electrode plate 400, and the bipolar electrode plate 200 through the separator 120 to construct an ion transfer channel in the bipolar electrode core and realize the transfer of charges.

[0095] In some examples, there are at least two bipolar electrode plates 200. The bipolar electrode plates 200 are arranged in sequence along a preset direction, and each bipolar electrode plate 200 is located between the positive electrode plate 300 and the negative electrode plate 400. The liquid storage structure 100 is clamped between two adjacent bipolar electrode plates 200.

[0096] When assembling the bipolar electrode core provided by the embodiment of the present application, first stack the positive electrode plate 300, the negative electrode plate 400, each bipolar electrode plate 200, and the liquid storage structure 100, and then perform heat pressing to complete the assembly of the bipolar electrode core. Thus, the assembly of the bipolar electrode core is relatively simple and convenient, with high production efficiency and low production cost.

[0097] Through heat pressing, the first adhesive member 114 and the second adhesive member 115 of each liquid storage structure 100 are adhesively bonded to the positive electrode plate 300, the negative electrode plate 400, and each bipolar electrode plate 200 correspondingly. At the same time, the liquid storage member 130 can shrink under temperature excitation to release the stored electrolyte 10, and the electrolyte 10 wets the positive electrode plate 300, the negative electrode plate 400, and each bipolar electrode plate 200. The first adhesive member 114 and the second adhesive member 115 are adhesively bonded to the positive electrode plate 300, the negative electrode plate 400, and each bipolar electrode plate 200 correspondingly to seal the peripheral side of the bipolar electrode core and prevent the electrolyte 10 from escaping.

[0098] Refer to Figure 8 , in specific implementation, the bipolar electrode plate 200 includes a first current collector 210, a first positive electrode dressing part 220, and a first negative electrode dressing part 230. The first positive electrode dressing part 220 and the first negative electrode dressing part 230 are respectively arranged on two opposite surfaces of the first current collector 210.

[0099] Two opposite sides of the first current collector 210 are correspondingly connected to the support frames 110 of the two liquid storage structures 100. One of the first positive electrode dressing part 220 and the first negative electrode dressing part 230 abuts against the separator 120 of one liquid storage structure 100, and makes part of the separator 120 move towards the liquid storage member 130 of the liquid storage structure 100, and the other is immersed in the electrolyte 10 released by the liquid storage member 130 of the other liquid storage structure 100.

[0100] Wherein, the first positive electrode dressing part 220 is arranged on one side of the first current collector 210 close to the negative electrode sheet 400, and the first negative electrode dressing part 230 is arranged on one side of the first current collector 210 close to the positive electrode sheet 300. The orthographic projection of the first current collector 210 in the preset direction, the orthographic projection of the first positive electrode dressing part 220 in the preset direction, and the orthographic projection of the first negative electrode dressing part 230 in the preset direction are all rectangles. The center of the orthographic projection of the first current collector 210 in the preset direction, the center of the orthographic projection of the first positive electrode dressing part 220 in the preset direction, and the center of the orthographic projection of the first negative electrode dressing part 230 in the preset direction are located on the same straight line, and this straight line extends along the preset direction.

[0101] Exemplarily, the orthographic projection of the first positive electrode dressing part 220 on the first current collector 210 and the orthographic projection of the first negative electrode dressing part 230 on the first current collector 210 are all located on the first current collector 210. The orthographic projection of the first positive electrode dressing part 220 in the preset direction and the orthographic projection of the first negative electrode dressing part 230 in the preset direction completely overlap.

[0102] Specifically, the bipolar electrode sheet 200 is located between the two liquid storage structures 100. Two opposite sides of the first current collector 210 are correspondingly bonded to the first bonding member 114 of one liquid storage structure 100 and the second bonding member 115 of the other liquid storage structure 100. The first negative electrode dressing part 230 abuts against the separator 120 of one liquid storage structure 100 and pushes part of the separator 120 towards the liquid storage member 130. The first positive electrode dressing part 220 is immersed in the electrolyte 10 released by the liquid storage member 130 of the other liquid storage structure 100. By directly abutting the first negative electrode dressing part 230 against the separator 120 and pushing the separator 120 to move, wrinkles are not likely to appear on the separator 120, the flatness of the separator 120 is improved, and at the same time, the insulation between the bipolar electrode sheet 200 and the liquid storage structure 100 is improved.

[0103] In some examples, the side surface of the first current collector 210, the surface of the first bonding member 114 facing away from the liquid storage member 130, and the surface of the second bonding member 115 facing away from the liquid storage member 130 are flush.

[0104] Further, the outer edge of the positive projection of the first current collector 210 in the preset direction is located within the positive projection of the support frame 110 in the preset direction, and the distance between the outer edge of the positive projection of the first current collector 210 in the preset direction and the outer peripheral side of the positive projection of the support frame 110 in the preset direction is 3 mm - 5 mm.

[0105] Referring to Figure 8 , in specific implementation, the positive projection of the first positive electrode dressing part 220 in the preset direction is located inside the positive projection of the support frame 110 in the preset direction, and the positive projection of the first negative electrode dressing part 230 in the preset direction is located inside the positive projection of the support frame 110 in the preset direction.

[0106] Further, the liquid storage member 130 is annular. After the liquid storage member 130 shrinks, the positive projection of the first positive electrode dressing part 220 in the preset direction is located inside the positive projection of the liquid storage member 130 in the preset direction, so as to facilitate the first positive electrode dressing part 220 to be wetted by the electrolyte 10 released by the liquid storage member 130.

[0107] In some examples, before the liquid storage member 130 shrinks, the positive projection of the first positive electrode dressing part 220 in the preset direction coincides with the positive projection of a part of the liquid storage member 130 in the preset direction.

[0108] Referring to Figure 8 , in specific implementation, the positive projection of the separator 120 on the first current collector 210 is located inside the first current collector 210. In this way, part of the first current collector 210 can be located outside the separator 120, so as to facilitate the bonding of the first current collector 210 with the first bonding member 114 and the second bonding member 115.

[0109] Referring to Figure 8 , in specific implementation, the positive electrode sheet 300 includes a second current collector 310 and a second positive electrode dressing part 320 provided on the second current collector 310, and the negative electrode sheet 400 includes a third current collector 410 and a second negative electrode dressing part 420 provided on the third current collector 410.

[0110] The second current collector 310 and the third current collector 410 are connected to the support frame 110 of the two liquid storage structures 100. One of the second positive electrode dressing part 320 and the second negative electrode dressing part 420 abuts against the separator 120 of a liquid storage structure 100, and makes part of the separator 120 move towards the liquid storage member 130 of the liquid storage structure 100, and the other is wetted by the electrolyte released by the liquid storage member 130 of the other liquid storage structure 100.

[0111] Among them, the positive projection of the second positive electrode dressing portion 320 in the preset direction is located inside the positive projection of the support frame 110 in the preset direction, and the positive projection of the second negative electrode dressing portion 420 in the preset direction is located inside the positive projection of the support frame 110 in the preset direction.

[0112] Exemplarily, the positive projection of the second positive electrode dressing portion 320 in the preset direction may completely coincide with the positive projection of the first positive electrode dressing portion 220 in the preset direction. The positive projection of the second negative electrode dressing portion 420 in the preset direction completely coincides with the positive projection of the first negative electrode dressing portion 230 in the preset direction.

[0113] The positive projection of the second current collector 310 in the preset direction completely coincides with the positive projection of the third current collector 410 in the preset direction, and also completely coincides with the positive projection of the first current collector 210 in the preset direction.

[0114] In some embodiments, the thickness of the first positive electrode dressing portion 220 in the preset direction is equal to the thickness of the second positive electrode dressing portion 320 in the preset direction, and the thickness of the first negative electrode dressing portion 230 in the preset direction is equal to the thickness of the second negative electrode dressing portion 420 in the preset direction.

[0115] Furthermore, the sum of the thickness of the first positive electrode dressing portion 220 in the preset direction, the thickness of the separator 120 in the preset direction, and the thickness of the second positive electrode dressing portion 320 in the preset direction is less than the thickness of the support frame 110 in the preset direction, so that when the first negative electrode dressing portion 230 abuts against the separator 120, there is a gap between the first positive electrode dressing portion 220 and the separator 120, that is, they are not in direct contact with the separator 120.

[0116] In some examples, the thickness of the first positive electrode dressing portion 220 in the preset direction may be equal to the thickness of the first adhesive member 114 in the preset direction, and the thickness of the first negative electrode dressing portion 230 in the preset direction may be equal to the thickness of the second adhesive member 115 in the preset direction. The thickness of the first positive electrode dressing portion 220 in the preset direction may be equal to the thickness of the first negative electrode dressing portion 230 in the preset direction.

[0117] Refer to Figure 8, in the embodiment of the present application, there is one bipolar pole piece 200 and two liquid storage structures 100. When assembling the bipolar pole core, first stack them in sequence according to the order of the positive pole piece 300, the liquid storage structure 100, the bipolar pole piece 200, the liquid storage structure 100, and the negative pole piece 400, so that the first adhesive member 114 and the second adhesive member 115 of each liquid storage structure 100 are in corresponding contact with the first current collector 210, the second current collector 310, and the third current collector 410, and make the first positive electrode dressing part 220 and the second positive electrode dressing part 320 contact the liquid storage member 130 of the corresponding liquid storage structure 100, and the first negative electrode dressing part 230 and the second negative electrode dressing part 420 abut against the separator 120 of the corresponding liquid storage structure 100, and push the separator 120 to move towards the inside of the liquid storage structure 100. The circumferences of the second current collector 310 and the third current collector 410 have heat-sealing areas. Perform heat-pressing treatment on the heat-sealing areas to heat-seal the circumference of the bipolar pole core. Furthermore, the first adhesive member 114 and the second adhesive member 115 of each liquid storage structure 100 can be adhesively bonded to the first current collector 210, the second current collector 310, and the third current collector 410 under the action of heat-pressing. At the same time, the temperature of heat-pressing can be transmitted to the circumference of the liquid storage member 130, so that the ambient temperature of the circumference of the liquid storage member 130 is raised to a preset temperature, and then the liquid storage member 130 shrinks, releasing the electrolyte 10.

[0118] The embodiment of the present application also provides a bipolar battery, including: a housing and any one of the bipolar pole cores in the above embodiment, and the bipolar pole core is located inside the housing.

[0119] The embodiment of the present application also provides a battery pack, including: an outer shell and the above bipolar battery, and the bipolar battery is located inside the outer shell.

[0120] The embodiment of the present application also provides an electrical device, including: a device body, and a bipolar battery or a battery pack provided on the device body.

[0121] Exemplarily, the electrical device can be a vehicle.

[0122] In the description and claims of the embodiments of the present application and the above drawings, the terms "first", "second", etc. are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present application described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0123] In the embodiments of the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation. Moreover, in addition to being used to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present application can be understood according to specific circumstances.

[0124] In addition, the terms "arranged", "connected" and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0125] Unless otherwise specified, the term "plurality" means two or more.

[0126] After considering the specification and practicing the application disclosed herein, those skilled in the art will readily conceive of other embodiments of the present application. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and embodiments are only regarded as exemplary, and the scope of the present application is only limited by the appended claims.

Claims

1. A liquid storage structure, characterized in that: include: Support frame (110); a diaphragm (120), the diaphragm (120) being arranged on one surface of the supporting frame (110); A liquid storage member (130), the liquid storage member (130) being arranged in the support frame (110), and the liquid storage member (130) and the diaphragm (120) being arranged at intervals along the thickness direction of the support frame (110), the liquid storage member (130) being used to store an electrolyte (10), and the liquid storage member (130) being used to contract when subjected to external stimulation so as to release the electrolyte (10).

2. The liquid storage structure according to claim 1, characterized in that: The liquid storage element (130) is a heat shrinkable element, and the liquid storage element (130) is configured to shrink when the temperature is greater than or equal to a preset temperature.

3. The liquid storage structure according to claim 1, characterized in that: The liquid storage element (130) is a porous material element.

4. The liquid storage structure according to claim 3, characterized in that: The porosity of the liquid storage component (130) is greater than or equal to 90%.

5. The liquid storage structure according to claim 1, characterized in that: The liquid storage member (130) is annular, and the outer side of the liquid storage member (130) is connected to the inner side of the support frame (110).

6. The liquid storage structure according to any one of claims 1 to 5, characterized in that: The support frame (110) comprises a support member (111), a first adhesive member (114) and a second adhesive member (115); the first adhesive member (114) and the second adhesive member (115) are arranged on two opposite surfaces of the support member (111); at least one of the inner side of the support member (111) and the inner side of the first adhesive member (114) is connected to the liquid storage member (130); and the peripheral side of the diaphragm (120) is bonded to a surface of a portion of the second adhesive member (115) facing away from the support member (111).

7. The liquid storage structure according to claim 6, characterized in that: The support member (111) comprises a limiting portion (112) and a supporting portion (113) arranged on one side of the limiting portion (112); the first adhesive member (114) and the second adhesive member (115) are bonded to two opposite sides of the limiting portion (112); and the limiting portion (112) is arranged on the outside of the supporting portion (113).

8. The liquid storage structure according to claim 7, characterized in that: A side of the first adhesive component (114) facing the liquid storage component (130), a side of the second adhesive component (115) facing the liquid storage component (130), and a side of the support portion (113) facing the liquid storage component (130) are flush.

9. The liquid storage structure according to claim 7, characterized in that: The limiting portion (112) has two side surfaces which are arranged opposite to each other along the thickness direction of the supporting frame (110), and the two side surfaces are respectively flush with a side of the first adhesive component (114) which faces away from the supporting portion (113) and a side of the second adhesive component (115) which faces away from the supporting portion (113).

10. A bipolar pole core, characterized in that: It comprises a positive electrode sheet (300), a negative electrode sheet (400), at least one bipolar electrode sheet (200), and at least two liquid storage structures (100) according to any one of claims 1 to 9; The positive electrode sheet (300), the bipolar electrode sheet (200) and the negative electrode sheet (400) are arranged in sequence along a preset direction; the liquid storage structure (100) is sandwiched between the positive electrode sheet (300) and the bipolar electrode sheet (200); and / or the liquid storage structure (100) is sandwiched between the negative electrode sheet (400) and the bipolar electrode sheet (200).

11. The bipolar pole core according to claim 10, characterized in that: The bipolar pole piece (200) comprises a first current collector (210), a first positive electrode dressing portion (220) and a first negative electrode dressing portion (230), wherein the first positive electrode dressing portion (220) and the first negative electrode dressing portion (230) are respectively arranged on two opposite surfaces of the first current collector (210); Two opposite sides of the first current collector (210) are correspondingly connected to the support frames (110) of the two liquid storage structures (100); one of the first positive electrode dressing part (220) and the first negative electrode dressing part (230) abuts against the diaphragm (120) of one of the liquid storage structures (100), and a portion of the diaphragm (120) moves toward the liquid storage part (130) of the liquid storage structure (100); and the other is immersed in the electrolyte (10) released by the liquid storage part (130) of the other liquid storage structure (100).

12. The bipolar pole core according to claim 11, characterized in that: The orthographic projection of the first positive electrode dressing portion (220) in the preset direction is located on the inner side of the orthographic projection of the support frame (110) in the preset direction, and / or the orthographic projection of the first negative electrode dressing portion (230) in the preset direction is located on the inner side of the orthographic projection of the support frame (110) in the preset direction.

13. The bipolar pole core according to claim 11, characterized in that: The orthographic projection of the diaphragm (120) on the first current collector (210) is entirely located on the first current collector (210).

14. The bipolar pole core according to claim 10, characterized in that: The positive electrode sheet (300) comprises a second current collector (310) and a second positive electrode dressing portion (320) disposed on the second current collector (310); the negative electrode sheet (400) comprises a third current collector (410) and a second negative electrode dressing portion (420) disposed on the third current collector (410); The second current collector (310) and the third current collector (410) are connected to the support frames (110) of the two liquid storage structures (100); one of the second positive electrode dressing part (320) and the second negative electrode dressing part (420) abuts against the diaphragm (120) of one of the liquid storage structures (100) and moves part of the diaphragm (120) toward the liquid storage part (130) of the liquid storage structure (100); and the other is immersed in the electrolyte released by the liquid storage part (130) of the other liquid storage structure (100).

15. A bipolar battery, characterized in that: include: A shell and a bipolar pole core as described in any one of claims 10 to 14, wherein the bipolar pole core is located in the shell.

16. A battery pack, characterized in that: include: A housing and the bipolar battery as claimed in claim 15, wherein the bipolar battery is located in the housing.

17. An electrical equipment, characterized in that: include: A device body, and a bipolar battery as claimed in claim 15 or a battery pack as claimed in claim 16 arranged on the device body.

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