Electrolyte storage device, battery and battery pack

Abstract

The utility model provides an electrolyte storage device, a battery and a battery pack, the battery comprises a shell, a plurality of battery cells and the electrolyte storage device, the plurality of battery cells are arranged in the shell, the end parts of the battery cells are attached to the inner wall of the shell, and the end parts of the adjacent battery cells and the shell form an accommodating cavity; the electrolyte storage device is arranged in the accommodating cavity and is used for storing electrolyte; the lithium ion battery aims to solve the technical problem that the cycle performance of the lithium ion battery is reduced due to the fact that electrolyte in the lithium ion battery is consumed too fast.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to an electrolyte storage device, a battery, and a battery pack. Background Technology

[0002] During the cycling process of lithium-ion batteries, the unstable SEI film (Solid Electrolyte Interface membrane) repeatedly forms, grows, splits, and regenerates, consuming reversible lithium sources and electrolytes. In the later stages of cycling, dead lithium formed will react with the electrolyte, which will accelerate electrolyte consumption, leading to electrolyte capacity decay and reduced cycle performance of lithium-ion batteries. Utility Model Content

[0003] Embodiments of this utility model provide an electrolyte storage device, a battery, and a battery pack, aiming to solve the technical problem in related technologies where rapid electrolyte consumption leads to reduced cycle performance of lithium-ion batteries.

[0004] In a first aspect, embodiments of the present invention provide a battery, comprising:

[0005] case;

[0006] A plurality of battery cells are disposed in the housing, with end portions of the battery cells fitting against the inner wall of the housing, and the ends of adjacent battery cells forming a receiving cavity with the housing; and,

[0007] An electrolyte storage device is disposed in the receiving cavity, and the electrolyte storage device is configured to store electrolyte.

[0008] In one embodiment, the electrolyte storage device is attached to the ends of the two battery cells.

[0009] In one embodiment, each of the ends is arc-shaped towards the inner wall of the housing, the arc-shaped surface is tangent to the side plate of the housing, and two adjacent arc-shaped surfaces and the housing form the receiving cavity.

[0010] In one embodiment, the shape of the electrolyte storage device is adapted to the shape of the receiving cavity so that the electrolyte storage device fits into the two battery cells.

[0011] In one embodiment, the electrolyte storage device includes a first absorbent plate, a second absorbent plate, and a third absorbent plate, wherein the first absorbent plate, the second absorbent plate, and the third absorbent plate surround to form a weight-reducing hole, and the first absorbent plate and the second absorbent plate are respectively attached to two adjacent ends;

[0012] Among them, the electrolyte is adsorbed in the first liquid absorption plate, the second liquid absorption plate, and the third liquid absorption plate.

[0013] In one embodiment, the first liquid absorption plate and the second liquid absorption plate are bent towards the third liquid absorption plate so that the first liquid absorption plate and the second liquid absorption plate are in contact with the end portion.

[0014] In one embodiment, the thickness of the first liquid absorption plate is W2, the width of each battery cell is W1, and 0 < W2 / W1 ≤ √2 / 4; and / or,

[0015] the thickness of the second liquid absorption plate is W3, the width of each battery cell is W1, and 0 < W3 / W1 ≤ √2 / 4; and / or,

[0016] the thickness of the third liquid absorption plate is W4, the width of each battery cell is W1, and 0 < W4 / W1 ≤ √2 / 4.

[0017] In one embodiment, the first liquid absorption plate includes any one of a porous diaphragm, a porous sponge, and a porous carbon material; and / or,

[0018] the second liquid absorption plate includes any one of a porous diaphragm, a porous sponge, and a porous carbon material; and / or,

[0019] the third liquid absorption plate includes any one of a porous diaphragm, a porous sponge, and a porous carbon material.

[0020] In one embodiment, the capacity of the electrolyte in the battery is m, the capacity of the electrolyte in the electrolyte storage device is m2, and 0.1 ≤ m2 / m ≤ 0.3.

[0021] In one embodiment, it further includes a fourth liquid absorption plate, which is disposed between the plurality of battery cells and the bottom of the housing, and the fourth liquid absorption plate is in contact with the plurality of battery cells.

[0022] In a second aspect, an embodiment of the present invention provides an electrolyte storage device applied to a battery, and the battery includes:

[0023] A housing;

[0024] A plurality of battery cells disposed in the housing, a part of the end of the battery cell is in contact with the inner wall of the housing, and an accommodation cavity is formed between the ends of adjacent battery cells and the housing; and,

[0025] An electrolyte storage device disposed in the accommodation cavity, and the electrolyte storage device is configured to store electrolyte.

[0026] In a third aspect, an embodiment of the present invention provides a battery pack, including the above battery, and the battery includes:

[0027] case;

[0028] A plurality of battery cells are disposed in the housing, with end portions of the battery cells fitting against the inner wall of the housing, and the ends of adjacent battery cells forming receiving cavities with the housing; and,

[0029] An electrolyte storage device is disposed in the receiving cavity, and the electrolyte storage device is configured to store electrolyte.

[0030] The beneficial effects of the embodiments of this utility model are as follows:

[0031] In this utility model, an electrolyte storage device is provided inside the casing. The electrolyte storage device contains electrolyte and can serve as a backup resource for charging electrolyte. This effectively alleviates the problem of electrolyte decomposition and drying out during battery cycling, enhancing the battery's electrolyte retention and enrichment capabilities, thus extending battery life and improving battery safety. Simultaneously, the ends of adjacent cells form a receiving cavity with the casing. The electrolyte storage device is placed within the cavity formed by the gap between the cell and the inner wall of the casing. This allows for the installation of the electrolyte storage device without increasing the battery volume or sacrificing cell space, ensuring battery capacity while also meeting electrolyte retention and enrichment requirements. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a three-dimensional schematic diagram of a battery provided in an embodiment of this utility model;

[0034] Figure 2 yes Figure 1 A schematic diagram of a battery explosion;

[0035] Figure 3 yes Figure 1 A schematic diagram of an embodiment of an electrolyte storage device;

[0036] Figure 4 yes Figure 3 Top view (excluding the snap-fit ​​posts);

[0037] Figure 5 yes Figure 1 A schematic diagram showing the interaction between the battery cell and the fourth liquid suction plate;

[0038] Figure 6 yes Figure 1 Top view.

[0039] Explanation of icon numbers

[0040] label name label name 100 Battery 30 Snap-on post 1 case 31 First liquid absorption plate 2 battery cells 32 Second suction plate 21 end 33 Third suction plate 3 Electrolyte storage device 4 Fourth suction plate 34 Weight reduction hole Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0042] During the cycling process of lithium-ion batteries, the unstable SEI film (Solid Electrolyte Interface membrane) repeatedly forms, grows, splits, and regenerates, consuming reversible lithium sources and electrolytes. In the later stages of cycling, dead lithium formed will react with the electrolyte, which will accelerate electrolyte consumption, leading to electrolyte capacity decay and reduced cycle performance of lithium-ion batteries.

[0043] Example 1

[0044] In view of this, the present invention proposes a battery 100. Figures 1 to 6 This is a schematic diagram of a structure of an embodiment of the battery 100 provided by the present invention. The battery 100 provided by the present invention can be replenished with electrolyte, thereby ensuring that the battery 100 can operate normally in cycles. The battery 100 will be described in detail below with reference to the main drawings.

[0045] Please see Figure 1 and Figure 2 The present invention provides a battery 100, which includes a housing 1, a plurality of battery cells 2 and an electrolyte storage device 3; the plurality of battery cells 2 are disposed on the housing 1, and the end 21 of the battery cells 2 is attached to the inner wall of the housing 1, and the end 21 of adjacent battery cells 2 and the housing 1 form a receiving cavity; the electrolyte storage device 3 is disposed in the receiving cavity and is configured to store electrolyte.

[0046] In this utility model, an electrolyte storage device 3 is provided inside the casing 1. The electrolyte storage device 3 contains electrolyte and can serve as a backup resource for charging electrolyte. This effectively alleviates the situation where the electrolyte in the cell 2 decomposes and dries out during the battery cycle, enhances the electrolyte retention and enrichment capabilities of the battery 100, and helps extend the battery 100's service life and enhance its safety. At the same time, the end 21 of the adjacent cell 2 forms a receiving cavity with the inner wall of the casing 1. The electrolyte storage device 3 is placed in the receiving cavity by utilizing the gap between the cell 2 and the casing 1. This allows the electrolyte storage device 3 to be installed without increasing the volume of the battery 100 or sacrificing the space of the cell 2, ensuring the battery 100's capacity while also meeting the requirements for electrolyte retention and enrichment.

[0047] It should be noted that the electrolyte storage device 3 provided by this utility model stores electrolyte. During the battery 100 cycle, the SEI film repeatedly forms, grows, splits, and regenerates, consuming reversible lithium sources and electrolyte. Dead lithium formed in the later stage of the cycle will react with the electrolyte, which will accelerate the consumption of electrolyte. When the electrolyte in the cell 2 is consumed, the electrolyte storage device 3 in the containment cavity releases the electrolyte inside, and the electrolyte enters the cell 2 to replenish the electrolyte in the cell 2. This effectively alleviates the situation of the electrolyte in the cell 2 decomposing and drying out during the battery 100 cycle, enhances the electrolyte retention and electrolyte enrichment capabilities of the battery 100, helps to extend the service life of the battery 100, and enhances the safety of the battery 100.

[0048] In some embodiments, to ensure that the electrolyte in the electrolyte storage device 3 can smoothly enter the battery cell 2, the electrolyte storage device 3 is attached to the ends 21 of the two battery cells 2. In this way, when the electrolyte inside the battery cell 2 is consumed, the electrolyte in the electrolyte storage device 3 can quickly enter the battery cell 2.

[0049] Please continue reading. Figure 1 and Figure 2 In some embodiments, each cell 2 includes a body and two ends 21. The body is located between the two ends 21. The body is a cuboid and the two ends 21 are semi-cylinders. Each end 21 has an arc surface facing the inner wall of the housing 1. Since the ends 21 of the cell 2 are semi-cylinders, there will be a gap between two adjacent ends 21. The electrolyte storage device 3 is placed in the gap. By making reasonable use of space, the electrolyte storage device 3 is added without increasing the volume of the battery 100 or occupying the space of the cell 2, thereby meeting the need to replenish the electrolyte and making the energy density of the battery 100 higher.

[0050] Furthermore, the curved surface is tangent to the side plate of the casing 1, and two adjacent curved surfaces together with the casing 1 form a receiving cavity. The electrolyte storage device 3 is disposed in the receiving cavity, which does not require increasing the volume of the battery 100, nor does it occupy the space of the cell 2, thereby increasing the energy density of the battery 100.

[0051] In some embodiments, the electrolyte storage device 3 includes a porous sponge pad. The shape of the porous sponge pad is detected to ensure that it matches the shape of the cavity. After the battery cell 2 is installed in the housing 1, the porous sponge pad is directly installed in the cavity. Since the shape of the porous sponge pad is the same as that of the cavity, it can fill the cavity perfectly, thus making the electrolyte storage device 3 fit snugly against the two battery cells 2. When the electrolyte in the battery cell 2 is consumed, the electrolyte storage device 3 in the cavity releases the electrolyte inside, and the electrolyte enters the battery cell 2 to replenish the electrolyte in the battery cell 2. This effectively alleviates the situation where the electrolyte in the battery cell 2 decomposes and dries out during the battery cycle, enhances the electrolyte retention and enrichment capabilities of the battery 100, helps extend the service life of the battery 100, and enhances the safety of the battery 100.

[0052] In some embodiments, please refer to Figure 3 and Figure 4 The electrolyte storage device 3 includes a first absorbent plate 31, a second absorbent plate 32, and a third absorbent plate 33, all of which contain electrolyte. Specifically, one end of the first absorbent plate 31 is connected to one end of the second absorbent plate 32, the other end of the first absorbent plate 31 is connected to one end of the third absorbent plate 33, and the other end of the third absorbent plate 33 is connected to the other end of the second absorbent plate 32. In this way, the first absorbent plate 31, the second absorbent plate 32, and the third absorbent plate 33 are connected end to end, allowing the electrolyte within them to be transferred to each other, thus achieving a replenishment function.

[0053] Furthermore, in some embodiments, the first liquid-absorbing plate 31, the second liquid-absorbing plate 32, and the third liquid-absorbing plate 33 are arranged to form a weight-reducing hole 34, which can reduce the weight of the electrolyte storage device 3, thereby reducing the weight of the battery 100.

[0054] In some embodiments, please refer to Figure 1 and Figure 3In this embodiment, the first absorbent plate 31 and the second absorbent plate 32 are respectively attached to two adjacent ends 21. It should be noted that while the first absorbent plate 31, the second absorbent plate 32, and the third absorbent plate 33 simultaneously supply electrolyte to the battery cell 2, in actual operation, the two battery cells 2 consume electrolyte at different rates. For example, in some embodiments, the battery cell 2 attached to the first absorbent plate 31 consumes electrolyte at a higher rate than the battery cell 2 attached to the second absorbent plate 32. A portion of the electrolyte in the second absorbent plate 32 is transferred to the battery cell 2 attached to the second absorbent plate 32, and another portion is transferred to the first absorbent plate 32. The first absorbent plate 31 transfers the electrolyte to the cell 2 that is attached to the first absorbent plate 31. During this process, the electrolyte in the third absorbent plate 33 is simultaneously transferred to the first absorbent plate 31 and the second absorbent plate 32, thereby ensuring sufficient electrolyte in the cell 2. This effectively alleviates the problem of electrolyte decomposition and drying out in the cell 2 during battery cycling, enhances the electrolyte retention and enrichment capabilities of the battery 100, and helps extend the service life of the battery 100 and enhance the safety of the battery 100.

[0055] In other embodiments, when the two cells 2 consume electrolyte at the same rate, the electrolyte in the first absorbent plate 31 is transferred to the cell 2 that is attached to the first absorbent plate 31, the electrolyte in the second absorbent plate 32 is transferred to the cell 2 that is attached to the second absorbent plate 32, and the electrolyte in the third absorbent plate 33 is transferred to both the first absorbent plate 31 and the second absorbent plate 32. This ensures sufficient electrolyte in the cell 2, effectively alleviates the situation where the electrolyte in the cell 2 decomposes and dries out during the battery cycle, enhances the electrolyte retention and enrichment capabilities of the battery 100, helps extend the service life of the battery 100, and enhances the safety of the battery 100.

[0056] It should be noted that the shapes of the first liquid absorption plate 31, the second liquid absorption plate 32, and the third liquid absorption plate 33 are not limited, as long as they can achieve electrolyte transfer.

[0057] In some embodiments, the first liquid-absorbing plate 31, the second liquid-absorbing plate 32, and the third liquid-absorbing plate 33 are all planar plates, and the three planar plates form a rhomboid prism. The first liquid-absorbing plate 31 and the second liquid-absorbing plate 32 are tangent to the end 21 of the battery cell 2.

[0058] In some other embodiments, the first liquid absorption plate 31 and the second liquid absorption plate 32 are bent towards the third liquid absorption plate 33, that is, the first liquid absorption plate 31 and the second liquid absorption plate 32 are arc-shaped plates, and the arc shapes of the first liquid absorption plate 31 and the second liquid absorption plate 32 are the same as the arc shapes of the two ends 21, so that the first liquid absorption plate 31 and the second liquid absorption plate 32 can completely fit with the ends 21. With such a setting, compared with the setting method in which the first liquid absorption plate 31, the second liquid absorption plate 32 and the third liquid absorption plate 33 are all flat plates, the contact area between the electrolyte storage device 3 and the battery cell 2 can be increased, so that the electrolyte in the electrolyte storage device 3 can fully enter the battery cell 2, effectively alleviating the situation that the electrolyte in the battery cell 2 decomposes and dries up during the cycling of the battery 100, enhancing the liquid retention and rich liquid capabilities of the battery 100, being beneficial to extending the service life of the battery 100, and enhancing the safety of the battery 100.

[0059] In some embodiments, please refer to Figure 4 and Figure 6 , the thickness of the first liquid absorption plate 31 is W2, the width of each battery cell 2 is W1, and 0 < W2 / W1 ≤ √2 / 4; it should be noted that when W2 / W1 is greater than √2 / 4, the thickness of the first liquid absorption plate 31 is relatively thick, and the space occupied by the electrolyte storage device 3 increases, and it is necessary to increase the volume of the battery 100 or reduce the volume of the battery cell 2. When W2 / W1 is less than or equal to 0, it means that the first liquid absorption plate 31 is not provided in the accommodation cavity, and the electrolyte is directly injected into the accommodation cavity. During transportation and use, the electrolyte is likely to penetrate and cause danger.

[0060] Similarly, the thickness of the second liquid absorption plate 32 is W3, the width of each battery cell 2 is W1, and 0 < W3 / W1 ≤ √2 / 4; when W3 / W1 is greater than √2 / 4, the thickness of the second liquid absorption plate 32 is relatively thick, and the space occupied by the electrolyte storage device 3 increases, and it is necessary to increase the volume of the battery 100 or reduce the volume of the battery cell 2. When W3 / W1 is less than or equal to 0, it means that the second liquid absorption plate 32 is not provided in the accommodation cavity, and the electrolyte is directly injected into the accommodation cavity. During transportation and use, the electrolyte is likely to penetrate and cause danger.

[0061] In some embodiments, the thickness of the third liquid absorption plate 33 is W4, the width of each battery cell 2 is W1, and 0 < W4 / W1 ≤ √2 / 4. When W4 / W1 is greater than √2 / 4, the thickness of the third liquid absorption plate 33 is relatively thick, and the space occupied by the electrolyte storage device 3 increases, and it is necessary to increase the volume of the battery 100 or reduce the volume of the battery cell 2. When W4 / W1 is less than or equal to 0, it means that the third liquid absorption plate 33 is not provided in the accommodation cavity, and the electrolyte is directly injected into the accommodation cavity. During transportation and use, the electrolyte is likely to penetrate and cause danger.

[0062] It should be noted that the thicknesses of the first absorbent plate 31, the second absorbent plate 32, and the third absorbent plate 33 can be the same or different, depending on the actual situation. As a preferred embodiment, the thicknesses of the first absorbent plate 31, the second absorbent plate 32, and the third absorbent plate 33 are the same.

[0063] Please continue reading. Figure 3 In some embodiments, for ease of installation, the electrolyte storage device 3 is provided with a snap-fit ​​post 30, and the battery 100 also includes a cover plate, which covers the housing 1. The cover plate is provided with snap-fit ​​holes, and the snap-fit ​​post 30 is snapped into the snap-fit ​​holes, thereby fixing the electrolyte storage device 3 in the housing 1 and ensuring the stability of the connection.

[0064] It should be noted that the specific materials of the first absorbent plate 31, the second absorbent plate 32, and the third absorbent plate 33 are not limited, as long as they can absorb and store the electrolyte. The first absorbent plate 31 can be a porous membrane, a porous sponge, or a porous carbon material; the second absorbent plate 32 can be a porous membrane, a porous sponge, or a porous carbon material; and the third absorbent plate 33 can be a porous membrane, a porous sponge, or a porous carbon material.

[0065] It should be noted that the battery 100 provided by this utility model injects electrolyte in multiple stages. Specifically, the electrolyte injection process includes a first injection and a second injection. The first injection is to inject electrolyte into the cell 2, and the second injection is to inject electrolyte into the electrolyte storage device 3. The purpose of the second injection is to compensate for the electrolyte that may be consumed or decomposed during the first injection. Therefore, the total amount of electrolyte in the battery 100 is the sum of the capacity of the first injection and the capacity of the second injection.

[0066] Specifically, the capacity of the electrolyte in the battery 100 is m, and the capacity of the electrolyte in the electrolyte storage device 3 is m2, where 0.1 ≤ m2 / m ≤ 0.3. More specifically, the capacity of the electrolyte in the electrolyte storage device 3 can be 0.1m, 0.15m, 0.2m, 0.25m, 0.3m, or other unlisted values.

[0067] In some embodiments, the capacity of the electrolyte in cell 2 is m3, where 0.7 ≤ m3 / m ≤ 0.9. More specifically, the capacity of the electrolyte in cell 2 may be 0.7m, 0.75m, 0.8m, 0.85m, 0.9m, or other unlisted values.

[0068] It should be noted that in this embodiment, the electrolyte in the electrolyte storage device 3 enters the cell 2 under pressure. The battery 100 is in a sealed state under normal operating conditions. When the electrolyte in the cell 2 decomposes, it generates gas, changing the gas pressure inside the casing 1. Due to the pressure, the electrolyte in the electrolyte storage device 3 enters the cell 2, thereby balancing the gas pressure inside the battery 100.

[0069] In some embodiments, please refer to Figure 5 The battery 100 also includes a fourth liquid-absorbing plate 4, which is disposed between the bottom of the plurality of battery cells 2 and the casing 1, and is in contact with the plurality of battery cells 2. Specifically, the fourth liquid-absorbing plate 4 is also used to replenish electrolyte to the battery cells 2. The size and arrangement of the fourth liquid-absorbing plate 4 are the same as those of the third liquid-absorbing plate 33, and will not be described in detail here.

[0070] In some embodiments, please refer to Figure 6 The length of housing 1 is L, the width of housing 1 is W, the height of housing 1 is H, and the volume of housing 1 is V1, where V1 = WLH. The length of the body of battery cell 2 is L1, the width of the body of battery cell 2 is W2, and the volume of battery cell 2 is V2, where V2 = 2H(W1L1 + 0.25πW1^2). The volume of electrolyte storage device 3 is V3, where V3 = (0.25W1^2 - 0.0625πW1^2) * H. It should be noted that the values ​​of L, H, W, W1, and L1 can be selected according to actual needs, as long as the relationship between V1, V2, and V3 is satisfied.

[0071] It should be noted that the release rate of electrolyte from the electrolyte storage device 3 is not limited and can be selected according to the actual situation. In some embodiments, the thickness of the battery cell 2 is 28.5 mm, the battery cell 2 includes 44 layers of single-wound cores, the expansion of the negative electrode of the battery cell 2 is 15%, the expansion of the single-wound core is 5%, the negative electrode can expand to 21%, and the expansion of the single-wound core can expand to 7%. The width of the housing 1 is defined as unit 1. As the battery cell 2 expands, the width of the housing 1 can increase by 1% to 20%. At this time, the release rate of electrolyte in the electrolyte storage device 3 is 0 to 1% m2, until all the electrolyte in the electrolyte storage device 3 is released.

[0072] This utility model also proposes a battery pack, which includes the battery 100 described above. The specific structure of the battery 100 is as described in the above embodiments. Since this battery pack adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0073] Furthermore, this utility model also proposes an electrical device, which includes the aforementioned battery pack. The specific structure of the battery pack is described in the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated upon further here.

[0074] It is understood that the electrical equipment mentioned includes, but is not limited to, electric toys, power tools, electric vehicles, automobiles, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. Automobiles can be gasoline-powered vehicles, natural gas-powered vehicles, and new energy vehicles.

[0075] Example 2

[0076] This utility model proposes an electrolyte storage device 3, which is applied to a battery 100. The battery includes a housing 1, multiple battery cells 2 and an electrolyte storage device 3. The multiple battery cells 2 are disposed in the housing 1, and the end portion 21 of the battery cells 2 is attached to the inner wall of the housing 1. The end portion 21 of adjacent battery cells 2 forms a receiving cavity with the housing 1. The electrolyte storage device 3 is disposed in the receiving cavity and is configured to store electrolyte.

[0077] The specific structure of the electrolyte storage device 3 can be referred to in Example 1, and will not be described in detail here.

[0078] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery, characterized in that, Comprising: A housing (1); A plurality of battery cells (2), disposed in the housing (1), a part of the end (21) of the battery cell (2) being in contact with the inner wall of the housing (1), and an accommodation cavity being formed between the end (21) of adjacent battery cells (2) and the housing (1); and, An electrolyte storage device (3), disposed in the accommodation cavity, the electrolyte storage device (3) being configured to store electrolyte.

2. The battery according to claim 1, characterized in that, The electrolyte storage device (3) is in contact with the ends (21) of two of the battery cells (2).

3. The battery according to claim 1, characterized in that, One side of each end (21) facing the inner wall of the housing (1) is an arc surface, the arc surface being tangent to the housing (1), and the accommodation cavity being enclosed by adjacent arc surfaces and the housing (1).

4. The battery according to claim 3, characterized in that, The shape of the electrolyte storage device (3) is adapted to the shape of the accommodation cavity so that the electrolyte storage device (3) is in contact with two of the battery cells (2).

5. The battery according to claim 3, characterized in that, The electrolyte storage device (3) includes a first liquid absorbing plate (31), a second liquid absorbing plate (32), and a third liquid absorbing plate (33), the first liquid absorbing plate (31), the second liquid absorbing plate (32), and the third liquid absorbing plate (33) enclosing a weight reduction hole (34), and the first liquid absorbing plate (31) and the second liquid absorbing plate (32) being respectively in contact with adjacent ends (21); wherein, the first liquid absorbing plate (31), the second liquid absorbing plate (32), and the third liquid absorbing plate (33) adsorb the electrolyte.

6. The battery according to claim 5, characterized in that, The first liquid absorbing plate (31) and the second liquid absorbing plate (32) are bent towards the third liquid absorbing plate (33) so that the first liquid absorbing plate (31) and the second liquid absorbing plate (32) are in contact with the end (21).

7. The battery according to claim 5, characterized in that, The thickness of the first liquid absorbing plate (31) is W2, the width of each battery cell (2) is W1, and 0 < W2 / W1 ≤ √2 / 4; and / or, The thickness of the second liquid absorbing plate (32) is W3, the width of each battery cell (2) is W1, and 0 < W3 / W1 ≤ √2 / 4; and / or, The thickness of the third liquid absorbing plate (33) is W4, the width of each battery cell (2) is W1, and 0 < W4 / W1 ≤ √2 / 4.

8. The battery according to claim 5, characterized in that, The first liquid absorbing plate (31) includes any one of a porous diaphragm, a porous sponge, and a porous carbon material; and / or, The second liquid absorbing plate (32) includes any one of a porous diaphragm, a porous sponge, and a porous carbon material; and / or, The third liquid absorbing plate (33) includes any one of a porous diaphragm, a porous sponge, and a porous carbon material.

9. The battery according to any one of claims 1-8, characterized in that, The capacity of the electrolyte in the battery (100) is m, the capacity of the electrolyte in the electrolyte storage device (3) is m2, and 0.1 ≤ (m2 / m) ≤ 0.

3.

10. The battery according to any one of claims 1-8, characterized in that, It further includes a fourth liquid absorbing plate (4), the fourth liquid absorbing plate (4) being disposed between the plurality of battery cells (2) and the bottom of the housing (1), and the fourth liquid absorbing plate (4) being in contact with the plurality of battery cells (2).

11. An electrolyte storage device, characterized in that, Applied to a battery (100), the battery (100) includes: A housing (1); Multiple battery cells (2) are disposed in the housing (1), with portions of the ends (21) of the battery cells (2) fitting against the inner wall of the housing (1), and the ends (21) of adjacent battery cells (2) forming a receiving cavity with the housing (1); and, An electrolyte storage device (3) is provided in the receiving cavity, and the electrolyte storage device (3) is configured to store electrolyte.

12. A battery pack, characterized in that, Includes multiple batteries (100) as described in any one of claims 1-10.

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