Battery and battery module

Abstract

The utility model relates to a battery and a battery module, and the battery comprises a first shell provided with a first opening; the top cover covers the first opening of the first shell, and the top cover is provided with pole columns with opposite polarities; the roll core is accommodated in the first shell, tabs with opposite polarities are led out from the roll core, and the tabs are connected with the pole columns; the roll core is wound on the outer side wall of the micro-channel unit; wherein the top cover is provided with a first through hole, and the first end part of the micro-channel unit extends towards the top cover and penetrates through the first through hole; a second through hole is formed in the bottom wall of the first shell, and the second end of the micro-channel unit extends in the direction of the first shell and penetrates through the second through hole. According to the utility model, the two ends of the micro-channel unit are connected with the liquid cooling plate of the battery module, and after the cooling liquid is introduced, the cooling liquid forms circulation between the liquid cooling plate and the micro-channel unit, so that the purpose of heat dissipation is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery and a battery module. Background Art

[0002] In current lithium battery equipment, wound-structured cells are adopted by many lithium battery manufacturers due to their stable battery performance and high manufacturing efficiency.

[0003] The main manufacturing process of the existing wound structure battery is as follows: through the winding of a fixed winding needle, the stripped positive electrode sheet, the separator, and the negative electrode sheet are wound and extruded into a cylindrical, elliptical, or square shape in sequence, and then placed in a square or cylindrical shell.

[0004] The winding process applies a certain tension to the diaphragm to ensure the neatness between the positive electrode, diaphragm and negative electrode. When the winding needle is pulled out at the end of the winding, there is a risk of pulling out the diaphragm or electrode due to the existence of friction, resulting in poor appearance flatness of the battery and possible defects such as diaphragm wrinkles inside.

[0005] In addition, the battery generates heat during the charge / discharge process. Under high current and high power conditions, the heat generation is faster. If the battery operates at too high a temperature, its life will be reduced and safety risks will be generated. To solve the above problems, single-sided liquid cooling is currently widely used in battery modules. The shortcomings of the existing technology are: the cooling area is small, resulting in slow heat dissipation of the battery cell. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model discloses a battery and a battery module.

[0007] The technical solution adopted by the utility model is as follows:

[0008] A battery comprising:

[0009] A first shell is provided with a first opening;

[0010] A top cover, covering the first opening of the first shell, the top cover being provided with poles with opposite polarities;

[0011] A winding core is accommodated in the first shell, and the winding core leads to a pole ear with opposite polarity, and the pole ear is connected to the pole;

[0012] A microchannel unit, wherein the winding core is wound around an outer side wall of the microchannel unit;

[0013] Wherein, the top cover is provided with a first through hole, the first end of the microchannel unit extends toward the top cover and is penetrated through the first through hole, the first end of the microchannel unit is flush with the edge of the first through hole or the first end of the microchannel unit extends out of the first through hole; the bottom wall of the first shell is provided with a second through hole, the second end of the microchannel unit extends toward the first shell and is penetrated through the second through hole, the second end of the microchannel unit is flush with the edge of the second through hole or the second end of the microchannel unit extends out of the second through hole.

[0014] In one embodiment of the present invention, the first end and the second end of the microchannel unit extend out from the first through hole and the second through hole respectively.

[0015] In one embodiment of the present invention, the distance between the first end of the microchannel unit and the outer surface of the top cover away from the winding core is a first length h. 1 , the height of the pole is h 2 ,h 1 and h 2 Satisfies the following relationship: 1 =h 2 +(10mm-50mm).

[0016] In one embodiment of the present invention, the thickness of the microchannel unit is 5mm-10mm.

[0017] In one embodiment of the utility model, the microchannel unit has a through channel, and the through channel includes at least one partition, which divides the through channel into a plurality of micro-channels; the microchannel unit includes two oppositely arranged panels and two oppositely arranged side panels, and the two side panels are respectively arranged on both sides of the panels; the partition is arranged between the two panels.

[0018] In an embodiment of the present invention, the partition has a first surface and a second surface that are opposite to each other, and the first surface and the second surface are any one of a plane and a curved surface.

[0019] In one embodiment of the present invention, the side plate has an arc-shaped surface that matches the winding core.

[0020] This embodiment also provides a battery module, including:

[0021] A second shell is formed with a second opening; a first liquid cooling plate is disposed on the bottom wall of the second shell, and a liquid inlet and a liquid outlet are provided in the second shell, and the liquid inlet and the liquid outlet are respectively connected to the inner cavity of the first liquid cooling plate;

[0022] A cover plate, covering the second opening of the second shell; the cover plate is provided with a hollow cavity;

[0023] A plurality of batteries as described above are accommodated in the second shell, and the first end and the second end of the microchannel unit of each battery are respectively plugged and matched with the cover plate and the water cooling plate.

[0024] In an embodiment of the present invention, the cover plate is provided with a plurality of first slots communicating with the hollow cavity, and the first liquid cooling plate is provided with a plurality of second slots.

[0025] In one embodiment of the present invention, when the first end and the second end of the microchannel unit extend out from the first through hole and the second through hole respectively, the first end and the second end are inserted into the first slot hole and the second slot hole.

[0026] In one embodiment of the present invention, when the first end and the second end of the microchannel unit are flush with the edges of the first through hole and the second through hole, the first liquid cooling plate and the cover plate are provided with plug-in parts inserted into the first end and the second end.

[0027] The above technical solution of the utility model has the following advantages compared with the prior art:

[0028] When the battery described in the utility model is wound, the microchannel unit can replace the winding needle, and the pole piece and the diaphragm can be directly wound on the outer wall of the microchannel unit to form a winding core. After the winding of the pole piece and the diaphragm is completed, there is no need to extract the microchannel unit, avoiding the risk of uneven diaphragm and pole piece of the winding core caused by using the existing winding needle.

[0029] The first end and the second end of the microchannel unit in the battery described in the utility model are subsequently connected to the first liquid cooling plate and the hollow cavity of the cover plate of the battery module, or the first end and the second end of the microchannel unit are subsequently connected to the first liquid cooling plate of the battery module and the second liquid cooling plate in the cover plate, respectively. After the coolant is introduced into the battery module, the coolant flows into the microchannel unit, and the coolant circulates between the first liquid cooling plate, the microchannel unit and the second liquid cooling plate, thereby achieving the purpose of heat dissipation.

[0030] In the battery module described in the utility model, the coolant flows from the liquid inlet into the first liquid cooling plate, flows from the second end of the microchannel unit of the battery to the first end of the microchannel unit, merges into the hollow cavity of the cover plate, and flows out from the liquid outlet. The coolant circulates in the battery module to play a role in heat dissipation, so that the battery module can achieve the effect of rapid heat dissipation after assembly and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0032] Figure 1 It is an exploded diagram of the battery in the utility model.

[0033] Figure 2 It is a structural schematic diagram of the top cover and the first shell in the utility model from a first viewing angle.

[0034] Figure 3 It is a structural schematic diagram of the top cover and the first shell in the utility model from a second viewing angle.

[0035] Figure 4 It is a structural schematic diagram of the microchannel unit in the utility model from the first viewing angle.

[0036] Figure 5 It is a structural schematic diagram of the microchannel unit in the utility model from a second viewing angle.

[0037] Figure 6 It is a structural schematic diagram of the battery module in the utility model from the first perspective.

[0038] Figure 7 It is a structural schematic diagram of the battery module in the utility model from a second viewing angle.

[0039] Figure 8 It is a structural schematic diagram of the top cover in the utility model.

[0040] Fig. 9 It is a structural schematic diagram of the first liquid cooling plate and the first shell in the utility model.

[0041] Explanation of the reference numerals in the specification: 100, top cover; 101, first through hole; 201, first pole; 202, second pole; 300, microchannel unit; 301, first panel; 302, first side panel; 303, second side panel; 304, second panel; 305, partition; 400, winding core; 401, first pole ear; 402, second pole ear; 500, first shell; 501, second through hole; 600, cover plate; 601, first slot; 700, second shell; 701, liquid inlet; 702, liquid outlet; 800, first liquid cooling plate; 801, second slot. DETAILED DESCRIPTION

[0042] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0043] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only the directions of the reference drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention. In addition, in all embodiments, the same reference numerals represent the same elements.

[0044] Embodiment 1

[0045] Combination Figures 1 to 3 , a battery comprising:

[0046] The first housing 500 is provided with a first opening;

[0047] A top cover 100 covers the first opening of the first shell 500, and the top cover 100 is provided with poles with opposite polarities;

[0048] The winding core 400 is accommodated in the first shell 500, and the winding core 400 leads out pole ears with opposite polarities, and the pole ears are connected to the poles;

[0049] The microchannel unit 300, the winding core 400 is wound around the outer wall of the microchannel unit 300;

[0050] Among them, the top cover 100 is provided with a first through hole 101, the first end of the microchannel unit 300 extends toward the direction of the top cover 100 and is penetrated through the first through hole 101, the first end of the microchannel unit 300 is flush with the edge of the first through hole 101 or the first end of the microchannel unit 300 extends out of the first through hole 101; the bottom wall of the first shell 500 is provided with a second through hole 501, the second end of the microchannel unit 300 extends toward the direction of the first shell 500 and is penetrated through the second through hole 501, the second end of the microchannel unit 300 is flush with the edge of the second through hole 501 or the second end of the microchannel unit 300 extends out of the second through hole 501.

[0051] A battery provided in this embodiment has a winding core 400 that can be directly wound on the outer wall of the microchannel unit 300. When the pole piece and diaphragm of the winding core 400 are wound, there is no need to extract the microchannel unit 300, thereby avoiding the risk of uneven diaphragm and pole piece of the winding core 400 caused by using the existing winding needle; and the first end and the second end of the microchannel unit 300 are subsequently connected to the first liquid cooling plate 800 and the hollow cavity of the cover plate 600 of the battery module respectively, or the first end and the second end of the microchannel unit 300 are subsequently connected to the first liquid cooling plate 800 of the battery module and the second liquid cooling plate in the cover plate 600 respectively. After the coolant is introduced into the battery module, the coolant flows into the interior of the microchannel unit 300, and the coolant circulates between the first liquid cooling plate 800, the microchannel unit 300 and the second liquid cooling plate to achieve the purpose of heat dissipation.

[0052] The battery can be cylindrical, flat, rectangular or other shapes. Figure 1 In the figure, the shape of the battery is a cuboid. The cuboid can be understood in a broad sense, and the corners of the cuboid can be right-angled or rounded.

[0053] In this embodiment, the top cover 100 is provided with a first pole 201 and a second pole 202 with opposite polarities; the winding core 400 leads out a first pole tab 401 and a second pole tab 402 with opposite polarities. Exemplarily, if the first pole 201 is a positive pole, the second pole 202 is a negative pole; if the first pole tab 401 is a positive pole, the second pole tab 402 is a negative pole. At this time, the first pole tab 401 and the first pole 201 can be connected by welding, and the second pole tab 402 and the second pole 202 can be connected by welding.

[0054] Specifically, the winding core 400 is formed by winding a positive electrode sheet, a negative electrode sheet and a separation film, wherein the electrode sheet can generally include a current collector and an active material layer, the active material layer is directly or indirectly coated on the current collector, and the current collector not coated with the active material layer serves as a pole tab sheet, and multiple pole tab sheets are stacked together and electrically connected to the pole.

[0055] In this embodiment, the first end and the second end of the microchannel unit 300 extend from the first through hole 101 and the second through hole 501 respectively. At this time, the first end of the microchannel unit 300 and the top cover 100 form a plug-in fit, and the second end of the microchannel unit 300 and the first shell 500 form a plug-in fit.

[0056] In this embodiment, the distance between the first end of the micro-channel unit 300 and the outer surface of the top cover 100 away from the winding core 400 is a first length h. 1 , the height of the pole is h 2 ,h 1 and h 2 Satisfies the following relationship: 1 =h2 +(10mm-50mm). It is understandable that the first end of the micro-channel unit 300 is slightly higher than the pole, so as to facilitate the connection between the micro-channel unit 300 and the top cover 100 and avoid touching the pole.

[0057] In addition, the distance between the second end of the microchannel unit 300 and the outer surface of the first shell bottom wall 500 away from the winding core 400 can be 5mm-10mm, which is convenient for subsequently embedding the microchannel unit 300 into the first liquid cooling plate 800 of the battery module.

[0058] In this embodiment, in order to balance the battery performance and heat dissipation, the thickness of the micro-channel unit 300 should be moderate. Generally, the thickness of the micro-channel unit 300 can be designed to be 5 mm-10 mm.

[0059] In this embodiment, the microchannel unit 300 has a through channel, and the through channel includes at least one partition 305, and the partition 305 divides the through channel into a plurality of micro channels; Figure 4 and Figure 5 The through channel includes three partitions 305, and the partitions 305 divide the through channel into four micro-channels. It can be understood that the micro-channels can also be two, three or more than four.

[0060] Specifically, the microchannel unit 300 includes a first panel 301 and a second panel 304 arranged opposite to each other and two first side panels 302 and a second side panel 303 arranged opposite to each other, and the first side panel 302 and the second side panel 303 are respectively arranged on both sides of the first panel 301 and the second panel 304; the partition 305 is arranged between the first panel 301 and the second panel 304.

[0061] The partition 305 has a first surface and a second surface opposite to each other, and the first surface and the second surface are either a plane or a curved surface, that is, the first surface is a plane or a curved surface, and the second surface is a plane or a curved surface. The flow path of the coolant is from the second end of the microchannel unit 300 along the first surface and the second surface of the partition 305 to the first end of the microchannel unit 300. In an optional embodiment, the first surface and the second surface of the partition 305 are both curved surfaces. Compared with the case where the first surface and the second surface of the partition 305 are both planes, the flow path of the coolant becomes longer, so that the coolant has a better cooling effect on the battery.

[0062] Furthermore, once the battery collides or hits, it is easy to cause point extrusion, which may lead to serious fire accidents. Therefore, the first side plate 302 and the second side plate 303 have arc-shaped surfaces that match the winding core 400, and the first side plate 302 and the second side plate 303 are designed with the direction of the collision in mind, making the battery safer and more reliable.

[0063] Embodiment 2

[0064] Combination Figure 6 and Figure 7 , a battery module, comprising:

[0065] The second shell 700 is formed with a second opening; the bottom wall of the second shell 700 is provided with a first liquid cooling plate 800, and the second shell 700 is provided with a liquid inlet 701 and a liquid outlet 702, and the liquid inlet 701 and the liquid outlet 702 are respectively connected to the internal cavity of the first liquid cooling plate 800;

[0066] The cover plate 600 covers the second opening of the second shell 700; the cover plate 600 is provided with a hollow cavity;

[0067] A plurality of batteries as provided in the first embodiment are housed in the second housing 700 , and the first end and the second end of the microchannel unit 300 of each battery are plugged into and matched with the cover plate 600 and the first liquid cooling plate 800 , respectively.

[0068] This embodiment provides a battery module. After the battery, the cover plate 600 and the second shell 700 are assembled, the coolant flows in from the liquid inlet 701, flows from the first liquid cooling plate 800 through the microchannel unit 300 of the battery into the cover plate 600, and flows out from the liquid outlet 702. The coolant circulates in the battery module to play a role in heat dissipation.

[0069] In this embodiment, combined with Figure 8 and Fig. 9 The cover plate 600 is provided with a plurality of first slots 601 communicating with the hollow cavity, and the first liquid cooling plate 800 is provided with a plurality of second slots 801. When the first end and the second end of the microchannel unit 300 extend from the first through hole 101 and the second through hole 501 respectively, the first end and the second end are inserted into the first slot 601 and the second slot 801.

[0070] In an optional embodiment, a second liquid cooling plate is disposed in the hollow cavity of the cover plate 600 , and in this case, a plurality of first slots 601 are formed in the second liquid cooling plate.

[0071] It is preferred that the cover plate 600 is provided with a plurality of first slots 601 communicating with the hollow cavity, so as to simplify the structure of the cover plate 600, reduce redundancy and lower costs.

[0072] In an optional embodiment, when the first end and the second end of the microchannel unit 300 are both flush with the edges of the first through hole 101 and the second through hole 501, the first liquid cooling plate 800 and the cover plate 600 are provided with a plug-in portion inserted into the first end and the second end. Specifically, the plug-in portion and the first end and the second end of the microchannel unit 300 are two complementary structures, the plug-in portion of the cover plate 600 is plugged into the first end of the microchannel unit 300, and the plug-in portion of the first liquid cooling plate 800 is plugged into the second end of the microchannel unit 300, so it can be seen that the design of the plug-in portion is a protruding design.

[0073] In the battery module, multiple batteries can be connected in series, in parallel or in mixed connection. Mixed connection means that multiple batteries are connected in series and in parallel. Multiple batteries can be directly connected in series, in parallel or in mixed connection, and then the whole formed by multiple batteries is accommodated in the second shell 700.

[0074] The working principle of this embodiment is as follows:

[0075] After the battery, the cover plate 600 and the second shell 700 are assembled, the coolant flows into the first liquid cooling plate 800 from the liquid inlet 701, flows from the second end of the microchannel unit 300 of the battery to the first end of the microchannel unit 300, merges into the hollow cavity of the cover plate 600 or the second liquid cooling plate, and flows out from the liquid outlet 702. The coolant circulates in the battery module and plays a role in heat dissipation, so that the battery module can achieve the effect of rapid heat dissipation after assembly and use.

[0076] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0077] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A battery, characterized in that: include: A first housing (500) is provided with a first opening; A top cover (100) covers the first opening of the first shell (500), and the top cover (100) is provided with poles with opposite polarities; A winding core (400) is accommodated in the first shell (500), the winding core (400) leads out pole ears with opposite polarities, and the pole ears are connected to the poles; A microchannel unit (300), wherein the winding core (400) is wound around an outer side wall of the microchannel unit (300); The top cover (100) is provided with a first through hole (101), the first end of the microchannel unit (300) extends in the direction of the top cover (100) and is penetrated through the first through hole (101), the first end of the microchannel unit (300) is flush with the edge of the first through hole (101) or the first end of the microchannel unit (300) protrudes from the first through hole (101); the bottom wall of the first shell (500) is provided with a second through hole (501), the second end of the microchannel unit (300) extends in the direction of the first shell (500) and is penetrated through the second through hole (501), the second end of the microchannel unit (300) is flush with the edge of the second through hole (501) or the second end of the microchannel unit (300) protrudes from the second through hole (501).

2. The battery according to claim 1, characterized in that The first end and the second end of the microchannel unit (300) extend from the first through hole (101) and the second through hole (501), respectively.

3. The battery according to claim 2, characterized in that The distance between the first end of the microchannel unit (300) and the outer surface of the top cover (100) away from the winding core (400) is a first length h1, the height of the pole is h2, and h1 and h2 satisfy the following relationship: h1=h2+(10mm-50mm).

4. The battery according to claim 1, characterized in that The thickness of the microchannel unit (300) is 5 mm-10 mm.

5. The battery according to claim 1, characterized in that The microchannel unit (300) has a through channel, the through channel includes at least one partition (305), and the partition (305) divides the through channel into a plurality of micro-channels; the microchannel unit (300) includes two oppositely arranged panels and two oppositely arranged side panels, and the two side panels are respectively arranged on both sides of the panels; the partition (305) is arranged between the two panels.

6. The battery according to claim 5, characterized in that The partition (305) has a first surface and a second surface that are opposite to each other, and the first surface and the second surface are either a flat surface or a curved surface.

7. The battery according to claim 5, characterized in that The side plate has an arc-shaped surface that matches the winding core (400).

8. A battery module, characterized in that: include: The second shell (700) is formed with a second opening; the bottom wall of the second shell (700) is provided with a first liquid cooling plate (800), and the second shell (700) is provided with a liquid inlet (701) and a liquid outlet (702), and the liquid inlet (701) and the liquid outlet (702) are respectively connected to the internal cavity of the first liquid cooling plate (800); A cover plate (600) covers the second opening of the second shell (700); the cover plate (600) is provided with a hollow cavity; A plurality of batteries as described in any one of claims 1 to 7 are accommodated in the second shell (700), and the first end and the second end of the microchannel unit (300) of each of the batteries are plugged into and matched with the cover plate (600) and the first liquid cooling plate (800), respectively.

9. The battery module according to claim 8, characterized in that: The cover plate (600) is provided with a plurality of first slot holes (601) in communication with the hollow cavity, and the first liquid cooling plate (800) is provided with a plurality of second slot holes (801).

10. The battery module according to claim 9, characterized in that: When the first end and the second end of the microchannel unit (300) extend from the first through hole (101) and the second through hole (501) respectively, the first end and the second end are inserted into the first slot hole (601) and the second slot hole (801).

11. The battery module according to claim 9, characterized in that: When the first end and the second end of the microchannel unit (300) are both flush with the edges of the first through hole (101) and the second through hole (501), the first liquid cooling plate (800) and the cover plate (600) are provided with plug-in parts inserted into the first end and the second end.

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