Single battery and energy storage device

Abstract

The utility model belongs to the technical field of batteries, and discloses a single battery and an energy storage device. The single battery comprises a battery cell group, a reinforcing assembly and a shell, wherein the battery cell group comprises at least two pole groups which are sequentially connected along a first direction; the reinforcing assembly comprises an annular reinforcing part and at least one supporting part, and the annular reinforcing part is arranged on the periphery of the battery cell group in a sleeving manner so as to fix the battery cell group; the two sides, in the second direction, of the supporting piece are connected to the inner circumferential wall of the annular reinforcing piece, and the supporting piece is arranged between every two adjacent pole sets so as to limit and support the connecting position of every two adjacent pole sets. The battery cell group and the reinforcing assembly are arranged in the shell, and the shell is used for protecting the battery cell group and the reinforcing assembly. According to the single battery, the battery cell group can be designed in a split manner, so that the manufacturing efficiency and precision of the battery cell group are improved, the structural strength of the whole battery cell group is enhanced, and the structural strength of the single battery and the deformation resistance of the pole group are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a single battery and an energy storage device. Background Art

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. Currently, the requirements for the performance and safety of lithium-ion batteries are increasing.

[0003] To increase capacity and energy density, existing lithium-ion batteries are gradually evolving into elongated batteries. This means the length of the battery cells within the batteries is increasing. This results in complex manufacturing processes and low manufacturing precision. Furthermore, as the battery cells make up an increasing proportion of the battery, other structural components, such as the casing, are gradually simplified to increase energy density. However, this can lead to problems such as cell bending and deformation, cell movement, and deformation of the battery casing, thus compromising the structural strength and safety of the lithium-ion battery.

[0004] Therefore, a new type of single cell is urgently needed to solve the above technical problems. Utility Model Content

[0005] One purpose of the present invention is to provide a single battery that can design the battery cell group separately, improve the manufacturing efficiency and precision of the battery cell group, enhance the structural strength of the entire battery cell group, and improve the structural strength of the single battery and the deformation resistance of the electrode group.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Single battery, including:

[0008] A battery cell group, comprising at least two electrode groups connected in sequence along a first direction;

[0009] A reinforcement assembly comprising an annular reinforcement member and at least one support member, wherein the annular reinforcement member is sleeved on the outer periphery of the battery cell group to fix the battery cell group; the support member is connected to the inner peripheral wall of the annular reinforcement member on both sides along a second direction, the second direction being perpendicular to the first direction, and the support member is disposed between two adjacent electrode groups to limit and support the connection between the two adjacent electrode groups;

[0010] The battery cell group and the reinforcement component are both arranged in the shell, and the shell is used to protect the battery cell group and the reinforcement component.

[0011] Optionally, one of the annular reinforcement and the support member is provided with at least one protrusion, and the other is provided with at least one slot, and the slots and the protrusions are connected in a one-to-one corresponding snap connection to connect the support member to the annular reinforcement.

[0012] Optionally, the support member includes a support seat and an end cover, the support seat is connected to the annular reinforcement, the support seat and the end cover are limitedly connected, and an accommodation space is formed, and the pole lugs of the pole group are placed in the accommodation space.

[0013] Optionally, a placement groove is provided on a side of the support seat facing the end cover, the placement groove is used to place the pole lugs of the pole group, and the end cover is limitedly connected to the placement groove to form the placement space.

[0014] Optionally, the pole lugs of the pole group are eccentrically arranged along the third direction, the first direction, the second direction and the third direction are perpendicular to each other, and the placement space is arranged close to one side of the support member along the third direction so that the placement space and the pole lugs of the pole group are installed correspondingly.

[0015] Optionally, one of the end cover and the support seat is provided with a first clamping portion, and the other is provided with a second clamping portion, and the first clamping portion is clamped and connected to the second clamping portion to limit the connection between the support seat and the end cover.

[0016] Optionally, the annular reinforcement comprises:

[0017] Two first reinforcing walls are arranged opposite to each other along the first direction, and the first reinforcing walls are provided with through holes to facilitate the insertion of the pole lugs of the pole group;

[0018] The two second reinforcing walls are arranged opposite to each other along the second direction, and the second reinforcing walls are connected to the supporting member.

[0019] Optionally, a dimension of the second reinforcing wall along the third direction is smaller than a dimension of the pole group along the third direction to form an exhaust channel, and the first direction, the second direction and the third direction are perpendicular to each other.

[0020] Optionally, the shell is provided with a first explosion-proof valve on both sides along the first direction, and at least one second explosion-proof valve is provided on both sides along the third direction of the shell. The first direction, the second direction and the third direction are perpendicular to each other, and the second explosion-proof valves are provided in a one-to-one correspondence with the support members.

[0021] Another object of the present invention is to provide an energy storage device that can design the battery cells separately, improve the manufacturing efficiency and precision of the battery cells, enhance the structural strength of the entire battery cell group, and improve the structural strength of the energy storage device and the deformation resistance of the electrode group.

[0022] To achieve this purpose, the present invention adopts the following technical solutions:

[0023] An energy storage device includes the above-mentioned single battery.

[0024] Beneficial effects of the utility model:

[0025] The utility model provides a single cell and an energy storage device. By dividing a battery cell group into a plurality of connected pole groups, not only the capacity of the single cell is increased, but also the manufacturing complexity of the pole groups is simplified and the manufacturing precision of the pole groups is improved. On this basis, adjacent pole groups are connected by support members, which also improves the support for the connection between the pole groups, thereby strengthening the structural strength of the battery cell group. Moreover, after the battery cell group is assembled, an annular reinforcement member is provided on its periphery to further fix and strengthen the battery cell group, thereby improving the structural strength of the battery cell group and effectively reducing the probability of the battery cell group having problems such as pole group movement and deformation, thereby improving the anti-deformation ability of the pole groups in the battery cell group, and further improving the structural strength and safety of the single cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is an exploded view of a single battery provided in a specific embodiment of the present utility model;

[0027] Figure 2 It is a top view of a single cell provided in a specific embodiment of the present utility model;

[0028] Figure 3 This is an axonometric view of a reinforcement assembly provided by a specific embodiment of the present invention when equipped with one pole group;

[0029] Figure 4 It is an axonometric view of the reinforcement assembly provided by the specific embodiment of the present utility model;

[0030] Figure 5 It is an exploded view of a support member provided in a specific embodiment of the present utility model;

[0031] Figure 6 It is a top view of a support member provided in a specific embodiment of the present utility model;

[0032] Figure 7 yes Figure 6 Cross-section at AA;

[0033] Figure 8 yes Figure 2 Cross-section at the middle BB;

[0034] Figure 9 yes Figure 8 A partial enlarged view of point C in the middle;

[0035] Figure 10 It is a top view of the protective patch provided by a specific embodiment of the present utility model.

[0036] In the picture:

[0037] 10. Cell group; 11. Electrode group; 111. Electrode tab;

[0038] 20. Reinforcement assembly; 21. Annular reinforcement member; 211. First reinforcement wall; 212. Second reinforcement wall; 2121. Clamping groove; 22. Support member; 221. Protrusion; 222. Support seat; 2221. First clamping portion; 223. End cap; 2231. Second clamping portion; 224. Mounting groove;

[0039] 30. Outer shell; 31. Shell; 32. Battery cover;

[0040] 40. First explosion-proof valve; 50. Second explosion-proof valve; 60. Protective patch; 61. Cutting seam. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0042] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0043] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0045] Refer to the following Figures 1 to 10 The utility model introduces a single battery and an energy storage device.

[0046] It should be noted that the first direction is Figure 1 The X direction in the second direction is Figure 1 The Y direction in the third direction is Figure 1 In the Z direction, the X direction, Y direction and Z direction are perpendicular to each other.

[0047] Please refer to Figure 1 and Figure 2 This embodiment provides a single battery cell, which includes a cell group 10, a reinforcement assembly 20, and a housing 30. The cell group 10 includes at least two electrode groups 11 connected in sequence along a first direction; the reinforcement assembly 20 includes an annular reinforcement member 21 and at least one support member 22. The annular reinforcement member 21 is sleeved around the outer periphery of the cell group 10 to secure the cell group 10; the support member 22 is connected to the inner circumferential wall of the annular reinforcement member 21 on both sides along a second direction, and the support member 22 is disposed between two adjacent electrode groups 11 to limit and support the connection between the two adjacent electrode groups 11; the cell group 10 and the reinforcement assembly 20 are both disposed within the housing 30, which is used to protect the cell group 10 and the reinforcement assembly 20.

[0048] The single battery in this embodiment, by dividing the battery cell group 10 into a plurality of connected electrode groups 11, not only increases the capacity of the single battery, but also simplifies the manufacturing complexity of the electrode groups 11 and improves the manufacturing accuracy of the electrode groups 11; on this basis, adjacent electrode groups 11 are connected by support members 22, which also improves the support for the connection between the electrode groups 11, thereby strengthening the structural strength of the battery cell group 10; and after the battery cell group 10 is assembled, an annular reinforcement member 21 is provided on its periphery to further fix and strengthen the battery cell group 10, thereby improving the structural strength of the battery cell group 10, effectively reducing the probability of problems such as movement and deformation of the electrode groups 11 in the battery cell group 10, thereby improving the deformation resistance of the electrode groups 11 in the battery cell group 10, and further improving the structural strength and safety of the single battery.

[0049] It can be understood that the series connection of the two adjacent pole groups 11 is achieved by welding the pole ears 111, and the pole ears 111 on the side of the pole group 11 facing the other pole group 11 are extended along the first direction. The support member 22 supports the connection between the pole ears 111 of the two pole groups 11, so that the pole ears 111 of the two pole groups 11 are connected by flat straight insertion and overlapping to avoid bending and fixing of the pole ears 111, shortening the length of the pole ears 111, improving space utilization, simplifying the processing technology, and also reducing internal resistance.

[0050] Please refer to Figure 3 and Figure 4 In some embodiments, one of the annular reinforcement 21 and the support member 22 is provided with at least one protrusion 221, and the other is provided with at least one slot 2121. The slot 2121 and the protrusion 221 are connected in a one-to-one corresponding snap connection to connect the support member 22 to the annular reinforcement 21, thereby achieving a fixed connection between the two, and also making it easy to disassemble the two for subsequent disassembly and maintenance.

[0051] Optionally, the support member 22 and the annular reinforcement member 21 are both insulating structures, so as to provide support and fixation while also insulating the position where the battery cell group 10 contacts the outside, thereby improving the safety of the battery cell group 10 .

[0052] Please refer to Figures 3 to 7 In some embodiments, the support member 22 includes a support seat 222 and an end cover 223. The support seat 222 is connected to the annular reinforcement 21. The support seat 222 and the end cover 223 are limitedly connected and form an accommodation space. The pole ear 111 of the pole group 11 is placed in the accommodation space, so that the support member 22 not only supports the pole group 11, but also protects the pole ear 111, covers the pole ear 111, and prevents short circuit overlap from causing safety problems. In addition, the support member 22 is designed to be two, which makes it easier to disassemble the support member 22.

[0053] Optionally, the support member 22 is a square structure, so that the surface of the support member 22 in contact with the electrode group 11 is a plane, thereby better playing the role of fixing and supporting.

[0054] Specifically, a placement groove 224 is provided on one side of the support seat 222 facing the end cover 223. The placement groove 224 is used to place the pole ear 111 of the pole group 11. The end cover 223 is limitedly connected to the placement groove 224 to form a placement space. In this way, the pole ear 111 can be covered in the support member 22, thereby achieving support and protection for the pole ear 111.

[0055] In some embodiments, the tab 111 of the electrode group 11 is eccentrically arranged along the third direction, and the placement space is arranged near one side of the support member 22 along the third direction, so that the placement space and the tab 111 of the electrode group 11 are installed correspondingly. The above arrangement makes the tab 111 more biased toward one side of the electrode group 11 along the third direction, avoiding the problem of welding and assembly difficulties caused by the tab 111 being centered in the center, further improving the convenience of welding and assembly processes such as the tab 111, thereby improving the assembly efficiency of the battery cell group 10.

[0056] In some embodiments, one of the end cover 223 and the support seat 222 is provided with a first clamping portion 2221, and the other is provided with a second clamping portion 2231. The first clamping portion 2221 is clamped and connected to the second clamping portion 2231 to limit the connection between the support seat 222 and the end cover 223, thereby realizing the connection between the two, thereby achieving support and protection for the pole ear 111, and also facilitating the disassembly and assembly of the support member 22, thereby facilitating the maintenance of the connection of the pole ear 111.

[0057] Specifically, the end cover 223 is in the shape of a "F" and not only has a placement space formed by being enclosed with the support seat 222, but also has a connecting portion that is clamped with the support seat 222; a first clamping portion 2221 or a second clamping portion 2231 is protruding from the groove wall of the placement groove 224, which cooperates with the end cover 223 to form a detachable support member 22 with a placement space.

[0058] In some embodiments, the annular reinforcement member 21 includes two first reinforcement walls 211 and two second reinforcement walls 212. The two first reinforcement walls 211 are arranged opposite each other along a first direction and have through-holes formed therein to facilitate the insertion of the tabs 111 of the electrode group 11. The two second reinforcement walls 212 are arranged opposite each other along a second direction and are connected to the support member 22. The first reinforcement walls 211 are used to provide protective support for both sides of the battery cell group 10 along the first direction, and the second reinforcement walls 212 are used to provide protective support for both sides of the battery cell group 10 along the second direction, thereby achieving protective support for the battery cell group 10.

[0059] Optionally, the first reinforcing wall 211 completely covers either side of the cell group 10 along the first direction, thereby achieving an insulating setting for the cell group 10 in the first direction, and only leaves a through hole to enable the tab 111 to pass through, facilitating the connection of the tab 111 with the outside.

[0060] Optionally, the dimension of the second reinforcing wall 212 along the third direction is smaller than the dimension of the pole group 11 along the third direction to form an exhaust channel, so that when the pole group 11 thermally runs away, the gas in the gap between the battery cell group 10 and the shell 31 can be discharged through the exhaust channel to the corresponding explosion-proof structure for discharge, so as to maintain the safety of the single battery.

[0061] Specifically, the second reinforcing wall 212 includes a plurality of first plates and a plurality of second plates, and the first plates and the second plates are alternately connected and arranged, and the size of the second plates along the second direction is smaller than the size of the first plates along the second direction, so that the gas storage area of the second plates and the exhaust channel is larger, so that the exhaust channel has a gas storage part, which increases the volume of the exhaust channel, thereby effectively increasing the gas occupied space in the outer shell 30, slowing down the rising rate of the pressure in the single cell, and further improving the safety of the single cell.

[0062] Optionally, the thickness of the annular reinforcement 21 is T, 0.5 mm < T < 3 mm, which can meet the requirements of strengthening and insulating the battery cell group 10 .

[0063] Please refer to Figure 1 and Figure 2 In some embodiments, the housing 30 is provided with first explosion-proof valves 40 on both sides along the first direction, and at least one second explosion-proof valve 50 on both sides along the third direction. The second explosion-proof valves 50 are provided in a one-to-one correspondence with the support members 22. That is, the housing 30 is provided with explosion-proof structures not only on both sides along the first direction, but also on both sides along the third direction. This ensures that even if the size of the single battery increases along the first direction, a corresponding explosion-proof structure is provided, thereby improving the explosion-proof and pressure relief effect of the single battery and making the single battery safer.

[0064] Specifically, the outer shell 30 includes a shell 31 and two battery cover plates 32. The shell 31 is provided with openings on both sides along the first direction. The two battery cover plates 32 are respectively sealed and connected to the openings. Each battery cover plate 32 is provided with a first explosion-proof valve 40. The shell 31 is provided with at least one second explosion-proof valve 50 on both sides along the third direction, and the second explosion-proof valve 50 is arranged in a one-to-one correspondence with the support member 22, so that each pole group 11 is provided with an explosion-proof structure on both sides along the first direction for explosion-proof pressure relief, shortening the pressure relief and exhaust path of the gas in the shell 31, and improving the safety of the single battery.

[0065] Optionally, the two battery cover plates 32 are structurally simplified, that is, the battery cover plate 32 only retains the cover plate body, the pole protrusion on the cover plate body and the first explosion-proof valve 40, without the need for other structures such as upper plastic, lower plastic, etc. This not only simplifies the structure, but also reduces costs and improves space utilization.

[0066] Optionally, the thickness of the cover body is L, 1.5mm < L < 3mm, to ensure the structural strength and usability of the cover body. Optionally, the height of the pole protruding from the cover body is H, 1.5mm < H < 3mm, to meet the electrical connection between the pole group 11 and the outside without taking up too much space.

[0067] Please refer to Figures 8 to 10 Optionally, a protective sticker 60 is also provided on the inner side of the second explosion-proof valve 50 provided on the shell 31 to protect the electrode group 11 and avoid collision between the electrode group 11 and the second explosion-proof valve 50, thereby preventing damage to the electrode group 11 or the second explosion-proof valve 50 and improving the safety of the single battery.

[0068] Optionally, the protective patch 60 is also provided with a slit 61 to ensure that the slit 61 is broken when the second explosion-proof valve 50 is venting pressure, so that the protective patch 60 will not affect the exhaust and pressure relief of the second explosion-proof valve 50, thereby improving the reliability of the pressure relief and exhaust of the second explosion-proof valve 50.

[0069] In some embodiments, the single cell further includes an insulating film, which is coated on the periphery of the electrode group 11 and insulates the battery cell group 10 together with the annular reinforcement 21 to ensure the insulation safety of the single cell.

[0070] This embodiment also provides an energy storage device comprising the single cell battery described in any of the above-mentioned solutions. The energy storage device is a structure such as a battery module or battery pack that incorporates the single cell battery and implements both energy storage and external power supply. By utilizing the above-mentioned single cell battery, the energy storage device utilizes a separate cell design, which increases the cell capacity while also improving the manufacturing efficiency and precision of the cell assembly 10. It also enhances the structural strength of the entire cell assembly 10, improving the structural strength of the energy storage device and the deformation resistance of the electrode assembly 11.

[0071] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A single cell battery, characterized in that: include: A battery cell group, comprising at least two electrode groups connected in sequence along a first direction; A reinforcement assembly comprising an annular reinforcement member and at least one support member, wherein the annular reinforcement member is sleeved on the outer periphery of the battery cell group to fix the battery cell group; the support member is connected to the inner peripheral wall of the annular reinforcement member on both sides along a second direction, the second direction being perpendicular to the first direction, and the support member is arranged between two adjacent electrode groups to limit and support the connection between the two adjacent electrode groups; The battery cell group and the reinforcement component are both arranged in the shell, and the shell is used to protect the battery cell group and the reinforcement component.

2. The single cell according to claim 1, characterized in that: One of the annular reinforcement and the support member is provided with at least one protrusion, and the other is provided with at least one slot. The slots and the protrusions are connected in a one-to-one corresponding snap connection to connect the support member to the annular reinforcement.

3. The single cell according to claim 1, characterized in that: The support member includes a support seat and an end cover. The support seat is connected to the annular reinforcement member. The support seat and the end cover are limitedly connected and form an accommodation space. The pole lugs of the pole group are placed in the accommodation space.

4. The single cell according to claim 3, characterized in that: The support seat is provided with a placement groove on one side facing the end cover, and the placement groove is used to place the pole lug of the pole group. The end cover is limitedly connected to the placement groove to form the placement space.

5. The single cell according to claim 3, characterized in that: The pole tabs of the pole group are eccentrically arranged along the third direction, the first direction, the second direction and the third direction are perpendicular to each other, and the placement space is arranged close to one side of the support member along the third direction so that the placement space and the pole tabs of the pole group are installed correspondingly.

6. The single cell according to claim 3, characterized in that: One of the end cover and the support seat is provided with a first clamping portion, and the other is provided with a second clamping portion. The first clamping portion is clamped and connected to the second clamping portion to ensure that the support seat and the end cover are connected in a limited position.

7. The single cell according to claim 1, characterized in that: The annular reinforcement comprises: Two first reinforcing walls are arranged opposite to each other along the first direction, and the first reinforcing walls are provided with through holes to facilitate the insertion of the electrode lugs of the electrode group; Two second reinforcing walls are arranged opposite to each other along the second direction, and the second reinforcing walls are connected to the supporting member.

8. The single cell according to claim 7, characterized in that: The dimension of the second reinforcing wall along the third direction is smaller than the dimension of the pole group along the third direction to form an exhaust channel. The first direction, the second direction and the third direction are perpendicular to each other.

9. The single cell according to any one of claims 1 to 8, characterized in that: The shell is provided with first explosion-proof valves on both sides along the first direction, and at least one second explosion-proof valve is provided on both sides along the third direction. The first direction, the second direction and the third direction are perpendicular to each other, and the second explosion-proof valves are provided in a one-to-one correspondence with the support members.

10. An energy storage device, characterized in that The invention comprises a single cell according to any one of claims 1 to 9.

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