Cell center direct cooling structure and cell

Abstract

The utility model provides a battery cell center direct cooling structure and a battery cell, and belongs to the technical field of new energy batteries. Comprising a battery core cover plate, a roll core supporting piece, a temperature acquisition device and a roll core package, a water inlet and outlet connector is arranged on the battery core cover plate in a penetrating manner, the roll core supporting piece is arranged below the battery core cover plate, a liquid cooling cavity is formed in the roll core supporting piece, a water inlet and a water outlet which are communicated with the liquid cooling cavity are formed in one side, close to the battery core cover plate, of the roll core supporting piece at intervals, and the water inlet and the water outlet are connected with the water inlet and outlet connector; the temperature acquisition device comprises a temperature acquisition sheet and an acquisition wire, the temperature acquisition sheet is attached to the outer surface of the roll core supporting piece, one end of the acquisition wire is connected with the temperature acquisition sheet, the other end of the acquisition wire penetrates out of the battery core cover plate through the water inlet and outlet connector, and the roll core package is wound on the outer surface of the roll core supporting piece and covers the temperature acquisition sheet. The technical problem that the working safety of the lithium ion battery is poor due to the defects of a traditional temperature control means and a heat dissipation and temperature equalization mode in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy battery technical field, especially a kind of battery core center direct cooling structure and battery core. BACKGROUND

[0002] Lithium ion battery is one of the current mainstream energy storage devices, widely used in new energy vehicles, various portable electronic devices and communication equipment. With the continuous progress of lithium ion battery related fields, especially the explosive development of new energy vehicle industry, in order to ensure the endurance, people put forward higher requirements on the overall service life of lithium ion battery.

[0003] In related technology, the cooling method of internal battery core in existing lithium ion battery is still mainly liquid cooling plate, including setting liquid cooling plate at the bottom of battery core module, or setting liquid cooling plate between single battery core in module to realize large-area liquid cooling heat exchange uniform temperature form.

[0004] The cooling method in related technology, regardless of how to change the setting form, is still in the framework of indirect contact cooling, that is, heat is transferred to cooling liquid through metal pipeline, and cooling liquid flowing in liquid cooling plate takes out heat from the outside of battery core shell. When the battery core is charging and discharging, the temperature inside the core package rises and cannot be directly solved by external indirect heat exchange, and the BMS battery management system usually only collects the temperature of the surface of the battery core shell for feedback and control when collecting temperature. The actual temperature difference between the surface and the inside of the battery core is often more than 5 DEG C. The above defects lead to the difficulty of accurate temperature control of lithium ion battery during work, and there is always the risk of thermal runaway accident, which affects the working safety of lithium ion battery. UTILITY MODEL CONTENTS

[0005] The utility model embodiment provides a kind of battery core center direct cooling structure and battery core, can solve the technical problem that the working safety of lithium ion battery in related technology is poor due to the defect of traditional temperature control means and heat dissipation uniform temperature mode. The technical solution is as follows:

[0006] In the first aspect, the utility model embodiment provides a kind of battery core center direct cooling structure, including battery core cover plate, water inlet and outlet joint is arranged on the battery core cover plate;

[0007] Roll core support, the roll core support is set to the battery core cover plate below, liquid cooling cavity is arranged in the roll core support, water inlet and outlet are arranged in the side of the roll core support close to the battery core cover plate, and the water inlet and outlet are connected with the water inlet and outlet joint;

[0008] The temperature collection device comprises a temperature collection sheet and a collection line, the temperature collection sheet is attached to the outer surface of the roll core support, one end of the collection line is connected to the temperature collection sheet, and the other end of the collection line is led out of the electric core cover plate through the water inlet and outlet joint.

[0009] The roll core core package is wound on the outer surface of the roll core support and covers the temperature collection sheet.

[0010] Optionally, the electric core cover plate is rectangular, and the roll core support is plate-shaped and perpendicular to the electric core cover plate.

[0011] Optionally, the liquid cooling cavity comprises a first cavity and a second cavity which are symmetrical along the center line of the electric core cover plate in the length direction, and a partition plate is arranged in the middle part, and a plurality of flow channel holes are uniformly and spacedly arranged on the partition plate.

[0012] Optionally, the opposite two side plate surfaces of the roll core support are convex arc surfaces.

[0013] Optionally, a middle part of at least one side plate surface of the roll core support is provided with an embedded groove, and the temperature collection sheet is embeddedly installed in the embedded groove.

[0014] Optionally, a wire groove for accommodating the collection line is arranged between the embedded groove and the side of the roll core support close to the electric core cover plate.

[0015] Optionally, the water inlet and outlet joint is detachably connected with the electric core cover plate.

[0016] Optionally, a waist-shaped liquid injection hole is arranged in the middle part of the electric core cover plate, the water inlet and outlet joint is cylindrical and is installed in the waist-shaped liquid injection hole in a penetrating manner and is sealed by hot melting.

[0017] Optionally, a positive electrode post, a negative electrode post and an explosion-proof valve are further arranged on the electric core cover plate, and the waist-shaped liquid injection hole is arranged between the positive electrode post and the negative electrode post.

[0018] In a second aspect, the utility model embodiment further provides an electric core which comprises the electric core center direct cooling structure as described in the first aspect, and further comprises a lower shell, the roll core support and the roll core core package are installed in the lower shell, and the electric core cover plate is fixedly arranged on the lower shell.

[0019] The technical scheme provided by the utility model embodiment has at least the following beneficial effects:

[0020] The electric core center direct cooling structure provided by the embodiment of the utility model, through setting the winding core support piece with liquid cooling cavity inside the winding core core package under the electric core cover plate, and connecting the water inlet and water outlet of the liquid cooling cavity through the water inlet and outlet joint on the electric core cover plate, the winding core support piece is used to support the winding core sheet of the winding core core package to improve the working safety, and the liquid cooling heat exchange circulation is formed in the center of the winding core core package, on this basis, the temperature acquisition sheet is attached on the winding core support piece, when the winding core core package is formed into the single electric core and the charging and discharging work is carried out, the temperature acquisition sheet can directly detect the center temperature of the single electric core, and the acquisition line is used to feedback to the external battery management system, the external liquid cooling circulation system is used to guide the cooling liquid with suitable temperature to carry out the center direct cooling operation from the middle part of the winding core core package, so that the heat exchange and temperature equalization caused by the temperature difference between the inside and outside of the single electric core are avoided, and the direct and accurate temperature control is realized. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can be obtained according to these drawings without creating labor.

[0022] Figure 1 It is the structure schematic diagram of the electric core center direct cooling structure provided by the embodiment of the utility model.

[0023] Figure 2 It is the structure sectional view of the electric core support piece provided by the embodiment of the utility model.

[0024] Figure 3 It is the external structure schematic diagram of the electric core support piece provided by the embodiment of the utility model.

[0025] Figure 4 It is the structure schematic diagram of the waist-shaped liquid injection hole provided by the embodiment of the utility model.

[0026] Figure 5 It is the structure explosion drawing of the electric core provided by the embodiment of the utility model.

[0027] In the figure: 1 - cell cover plate; 2 - cell support; 2a - convex arc surface; 3 - temperature acquisition device; 4 - roll core core package; 5 - lower shell; 11 - water inlet and outlet joint; 12 - waist-shaped liquid injection hole; 13 - positive electrode column; 14 - negative electrode column; 15 - explosion-proof valve; 21 - liquid cooling cavity; 22 - water inlet; 23 - water outlet; 24 - embedded groove; 25 - wire slot; 31 - temperature acquisition sheet; 32 - acquisition wire; 211 - first cavity; 212 - second cavity; 213 - isolation plate; 214 - flow channel hole. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model embodiment will be described in further detail below with the drawings.

[0029] Figure 1 It is the structural schematic diagram of the cell center direct cooling structure provided by the utility model embodiment; Figure 2 It is the structural section view of the cell support provided by the utility model embodiment; Figure 3 It is the external structural schematic diagram of the cell support provided by the utility model embodiment; Figure 4 It is the structural schematic diagram of the waist-shaped liquid injection hole provided by the utility model embodiment.

[0030] As Figures 1 to 4 The utility model embodiment provides a kind of cell center direct cooling structure, including cell cover plate 1, roll core support 2, temperature acquisition device 3 and roll core core package 4.

[0031] Wherein, water inlet and outlet joint 11 is arranged on cell cover plate 1. Roll core support 2 is arranged below cell cover plate 1, and liquid cooling cavity 21 is arranged in roll core support 2, and water inlet 22 and water outlet 23 that are connected with liquid cooling cavity 21 are arranged on the side of roll core support 2 close to cell cover plate 1, and water inlet 22 and water outlet 23 are connected with water inlet and outlet joint 11. Temperature acquisition device 3 includes temperature acquisition sheet 31 and acquisition wire 32. Temperature acquisition sheet 31 is attached on the outer surface of roll core support 2, one end of acquisition wire 32 is connected with temperature acquisition sheet 31, and the other end is passed through cell cover plate 1 by water inlet and outlet joint 11. Roll core core package 4 is wound and arranged on the outer surface of roll core support 2 and covers temperature acquisition sheet 31.

[0032] In the embodiment of the utility model, the electric core center direct cooling structure adds a roll core support 2 below the electric core cover plate of the traditional single electric core, the roll core support 2 is a roll core insert structure with certain space volume and internal cavity. When installing into the shell, it is integrally arranged below the electric core cover plate 1, and the water inlet 22 and the water outlet 23 are arranged on the top side end face of the roll core support 2 close to the electric core cover plate 1, both of which are connected with the internal cavity, so that the internal cavity forms a liquid cooling cavity 21 for the cooling liquid to enter from one side and leave from the other side. On the outside, the water inlet 22 and the water outlet 23 can be connected with the water inlet and outlet joint 11 on the electric core cover plate 1 through the corresponding pipeline, so as to be connected with the external cooling liquid circulation pipeline, realizing liquid cooling circulation. When assembling the single electric core, the roll core support 2 can be used as a roll core insert and wound in the center part of the roll core core package 4 together with the winding equipment when winding the roll core core package 4, so as to prevent the electric core roll core pole piece from collapsing when the roll core core package 4 breathes and circulates, improving the safety performance. At the same time, the temperature acquisition sheet 31 attached to the outer surface is also arranged on the roll core core package 4 center, and the acquisition line 32 connected with the temperature acquisition sheet 31 can be led out from the top of the roll core core package 4 to the outside of the electric core cover plate 1 together with the pipeline connected with the water inlet 22 and the water outlet 23. After the above structure enters the shell together with the roll core core package 4 and forms a complete single electric core by using the electric core cover plate 1, when the single electric core performs charging and discharging work, the temperature acquisition sheet 31 can be used to detect the center temperature of the single electric core during work from the inside of the roll core core package 4, and the acquisition line 32 is fed back to the BMS battery management system, so as to guide the external liquid cooling circulation system to guide the cooling liquid with suitable temperature into the liquid cooling cavity 21 from the water inlet and outlet joint 11, and the roll core support 2 directly exchanges heat with the inside of the roll core core package 4 to take away the heat from the single electric core, realizing the center direct cooling of the electric core.

[0033] The electric core center direct cooling structure provided by the embodiment of the utility model, through setting the winding core support 2 which is wound in the winding core core package 4 inside and has the liquid cooling cavity 21 below the electric core cover plate 1, and through the water inlet and outlet joint 11 on the electric core cover plate 1 and the water inlet 22 and water outlet 23 which are connected with the liquid cooling cavity 21, the winding core core package 4 is supported by the winding core support 2, the working safety is improved, the liquid cooling heat exchange circulation is formed in the center of the winding core core package 4, on this basis, the temperature acquisition sheet 31 is attached on the winding core support 2, when the winding core core package 4 is formed into a single electric core and carries out the charging and discharging work, the temperature acquisition sheet 31 can directly detect the center temperature of the single electric core, and the acquisition line 32 is fed back to the external battery management system, the cooling liquid with the suitable temperature is introduced by the external liquid cooling circulation system, the center direct cooling operation is carried out in the middle part of the winding core core package 4, thereby the insufficient heat exchange uniform temperature caused by the temperature difference between the inside and outside of the single electric core is avoided, the direct and accurate temperature control is realized, and the technical problem that the working safety of the lithium ion battery is poor due to the defects of the traditional temperature control means and the heat dissipation uniform temperature mode in the related art can be effectively solved.

[0034] Optionally, the electric core cover plate 1 is rectangular, and the winding core support 2 is plate-shaped and perpendicular to the electric core cover plate 1. Exemplarily, in the embodiment of the utility model, the electric core cover plate 1 adopts a rectangular structure, corresponding to the conventional square shell electric core, the winding core support 2 adopts a flat and plate-shaped structure with a certain thickness, which is suitable for the internal space of the square shell electric core, reduces the space occupation, covers the center of the winding core core package 4 as much as possible, increases the contact area, and improves the energy density of the single electric core.

[0035] Exemplarily, in other possible implementation manners, the electric core cover plate 1 can also be provided in a circular shape, and the corresponding winding core support 2 can be provided in a cylindrical shape, so as to adapt to a cylindrical electric core.

[0036] Optionally, the liquid cooling cavity 21 comprises a first cavity 211 and a second cavity 212 which are symmetrical along the center line of the electric core cover plate 1 in the length direction, and a partition plate 213 is arranged in the middle part, and a plurality of flow channel holes 214 are uniformly and spacedly arranged on the partition plate 213. Exemplarily, in the embodiment of the utility model, for the flat and plate-shaped structure winding core support 2, corresponding to the setting positions of the water inlet 22 and the water outlet 23, the liquid cooling cavity 21 is divided into two mutually isolated first cavities 211 and second cavities 212 below the two, and a plurality of flow channel holes 214 are uniformly and spacedly arranged on the partition plate 213 in the longitudinal direction. The cooling liquid entering from the water inlet 22 is first gathered in the first cavity 211, then enters the second cavity 212 at a certain rate through the plurality of flow channel holes 214 and finally flows out, and the setting can ensure the circulation flow time of the cooling liquid in the liquid cooling cavity 21, ensure sufficient heat exchange time, and improve the heat exchange uniform temperature effect.

[0037] Optionally, the opposite two side plate surfaces of the roll core support 2 are convex arc surfaces 2a. In the embodiment of the utility model, by setting the opposite two side plate surfaces of the plate-shaped roll core support 2 as convex arc surfaces 2a, the contact area of the roll core support 2 inside the roll core jelly roll 4 can be further ensured, and the corner arrangement at the turning part is reduced, so that the internal pole piece of the roll core jelly roll 4 is prevented from being scratched or extruded and deformed during winding and working, and the working effectiveness and safety are further improved.

[0038] Optionally, at least one side plate surface of the roll core support 2 is provided with an embedded groove 24 in the middle, and the temperature acquisition sheet 31 is embedded and installed in the embedded groove 24. In the embodiment of the utility model, by setting the embedded groove 24 on the convex arc surface 2a, and setting the corresponding connecting roll core support 2 line groove 25 on the side end surface close to the cell cover plate 1 above the embedded groove 24, the temperature acquisition sheet 31 and the acquisition line 32 are limited and embedded and installed, so that the installation stability can be further improved, the relative shaking inside the roll core jelly roll 4 during working is prevented, and the space occupation of the temperature acquisition device 3 and the roll core support 2 in the lateral direction of the cell is reduced, and the energy density of the single cell is further improved.

[0039] Optionally, the water inlet and outlet joint 11 is detachably connected with the cell cover plate 1. In the embodiment of the utility model, the cell cover plate 1 is provided with a waist-shaped liquid injection hole 12 in the middle, the water inlet and outlet joint 11 is in a cylindrical shape and is installed in the waist-shaped liquid injection hole 12, and is sealed by hot melting. The above detachable structure is adopted, the waist-shaped liquid injection hole 12 has a certain extension range in the horizontal direction, the cylindrical water inlet and outlet joint 11 is conveniently adjusted in the adaptive setting position, the overall assembly is facilitated, the remaining opening space can be used as a liquid injection hole for injecting electrolyte after assembly, one hole is used for two purposes, the integration of the cell cover plate 1 is improved. The detachable connection structure facilitates the flexible replacement and maintenance of the water inlet and outlet joint, and the manufacturing of the cell cover plate 1, and the overall practicability is improved.

[0040] Optionally, the cell cover plate 1 is further provided with a positive pole 13, a negative pole 14 and an explosion-proof valve 15, and the waist-shaped liquid injection hole 12 is arranged between the positive pole 13 and the negative pole 14. In the embodiment of the utility model, the positive pole 13, the negative pole 14 and the explosion-proof valve 15 are arranged on the conventional square shell single cell cover plate, and the waist-shaped liquid injection hole 12 requiring the water inlet and outlet joint 11 is arranged in the central part of the overall structure, so that the pipeline connection arrangement with the internal roll core support 2 is facilitated.

[0041] Figure 5 It is the structure explosion map of the cell provided by the embodiment of the utility model. As shown in Figure 5 the embodiment of the utility model also provides a cell, which comprises Figures 1 to 4The utility model discloses a battery cell center direct cooling structure, its characterized in that, still include lower shell 5, the winding core support 2 and winding core core package 4 are installed in lower shell 5, and the battery cell cover plate 1 fixed cover is established in lower shell 5. Exemplarily, the battery cell center direct cooling structure provided by the utility model embodiment is used and constitutes single battery cell, which will pass through setting up winding core support 2 that has liquid cooling cavity 21 in winding in the winding core core package 4 inside below the battery cell cover plate 1, and through the water inlet and outlet joint 11 on the battery cell cover plate 1 and the water inlet 22 and the water outlet 23 that communicate liquid cooling cavity 21 are connected. When the winding core support 2 is used to support the winding core pole piece of winding core core package 4 and improves the working safety, the liquid cooling heat exchange circulation is formed in the center of winding core core package 4. On this basis, through the temperature acquisition sheet 31 that is attached on the winding core support 2, when the winding core core package 4 enters the shell and forms single battery cell and carries out the charging and discharging work, the temperature acquisition sheet 31 can directly detect the center temperature of single battery cell, and utilizes the acquisition line 32 to feedback to the external battery management system, indicates that the external liquid cooling circulating system guides the cooling liquid of suitable temperature to carry out the center direct cooling operation from the middle part of winding core core package 4, thereby avoiding the insufficient heat exchange uniform temperature caused by the temperature difference existing in single battery cell, realizes direct and accurate temperature control. It can effectively solve the technical problem of poor working safety of lithium ion battery caused by the defects of traditional temperature control means and heat dissipation uniform temperature mode in the related art.

[0042] Unless otherwise defined, technical terms or scientific terms used herein shall have the ordinary meanings as understood by one of ordinary skill in the art to which the utility model belongs. The terms "first", "second", and similar terms used in the utility model patent application specification and claims do not denote any order, quantity, or importance, but are used to distinguish different components. Similarly, "one" or "a" and similar terms do not denote quantity limitation, but denote the existence of at least one. "Include" or "contain" and similar terms mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects. "Connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right", and the like are only used to represent relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0043] The above is only optional embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An electric cell center direct cooling structure, characterized by, It includes: The electric core cover plate (1) is provided with a water inlet and outlet joint (11) penetratingly arranged on the electric core cover plate (1); The roll core support (2) is arranged below the electric core cover plate (1), and the roll core support (2) is provided with a liquid cooling cavity (21) arranged therein. The roll core support (2) is provided with a water inlet (22) and a water outlet (23) arranged at intervals on the side close to the electric core cover plate (1) and communicating with the liquid cooling cavity (21). The water inlet (22) and the water outlet (23) are connected with the water inlet and outlet joint (11). The temperature acquisition device (3) includes a temperature acquisition sheet (31) and an acquisition line (32). The temperature acquisition sheet (31) is attached to the outer surface of the roll core support (2). One end of the acquisition line (32) is connected with the temperature acquisition sheet (31), and the other end is penetrated out of the electric core cover plate (1) by the water inlet and outlet joint (11). The roll core core package (4) is wound and arranged on the outer surface of the roll core support (2) and covers the temperature acquisition sheet (31).

2. The cell center direct cooling structure of claim 1, wherein, The electric core cover plate (1) is rectangular, and the roll core support (2) is plate-shaped and perpendicular to the electric core cover plate (1).

3. The cell center direct cooling structure of claim 2, wherein, The liquid cooling cavity (21) includes a first cavity (211) and a second cavity (212) which are symmetrical along the center line of the electric core cover plate (1) in the length direction, and a partition plate (213) is arranged in the middle. A plurality of flow channel holes (214) are uniformly and intervally arranged on the partition plate (213).

4. The cell center direct cooling structure of claim 2, wherein, The opposite two side surfaces of the roll core support (2) are convex arc surfaces (2a).

5. The cell center direct cooling structure of claim 4, wherein, At least one side surface of the roll core support (2) is provided with an embedded groove (24) in the middle. The temperature acquisition sheet (31) is embedded and installed in the embedded groove (24).

6. The cell center direct cooling structure of claim 5, wherein, A wire groove (25) for accommodating the acquisition line (32) is arranged between the embedded groove (24) and the side of the roll core support (2) close to the electric core cover plate (1).

7. The cell center direct cooling structure of claim 1, wherein, The water inlet and outlet joint (11) is detachably connected with the electric core cover plate (1).

8. The cell center direct cooling structure of claim 7, wherein, A waist-shaped liquid injection hole (12) is arranged in the middle of the electric core cover plate (1). The water inlet and outlet joint (11) is cylindrical and is installed in the waist-shaped liquid injection hole (12) by hot melt sealing.

9. The cell center direct cooling structure of claim 8, wherein, The electric core cover plate (1) is further provided with a positive electrode column (13), a negative electrode column (14) and an explosion-proof valve (15). The waist-shaped liquid injection hole (12) is arranged between the positive electrode column (13) and the negative electrode column (14).

10. An electric cell comprising the electric cell center cooling structure according to any one of claims 1 to 9, characterized by, It also includes a lower shell (5). The roll core support (2) and the roll core core package (4) are installed in the lower shell (5), and the electric core cover plate (1) is fixedly arranged on the lower shell (5).

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