Battery cell structure with liquid cooling function

Abstract

According to the battery cell structure with the liquid cooling function, in the structure, an outer shell is provided with a top opening; at least one core package is accommodated in the outer shell through the opening, and a tab is arranged at the top of the core package; the liquid cooling plate is of a hollow flow channel structure, and the surface liquid cooling parts extend downwards from the two sides of the top liquid cooling part to the part between the core package and the outer shell; the cover plate covers the top liquid cooling part and is connected with the outer shell in a sealing manner, the cover plate comprises a pole region aligned with the pole opening, an anti-explosion valve aligned with the anti-explosion valve opening, a second liquid injection hole aligned with the first liquid injection hole and a liquid cooling flow channel opening aligned with the liquid cooling flow channel, and the switching piece is arranged between the core package and the liquid cooling plate; the switching piece comprises a tab connecting area and a pole connecting area which are connected with the tabs, and the pole connecting area is connected with the pole area through the pole opening. The battery cell structure is good in cooling effect and does not occupy transverse and longitudinal spaces of the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a battery core structure with liquid cooling. Background Art

[0002] Consumers' further demand for long-range and fast-charging new energy vehicles has put forward higher requirements for the energy density and high-current flow capacity of automotive lithium-ion power batteries. On the other hand, the greater the energy density of the battery cell and the higher the charge and discharge rate, the greater the temperature rise of the battery. Long-term high-temperature use of power batteries will affect battery performance, and even lead to serious safety accidents. Therefore, manufacturers usually add heat dissipation structures such as liquid cooling plates to the battery cell, module or battery pack structure, and control the battery system to work in an appropriate temperature environment through the flow of coolant medium.

[0003] In addition, the temperature distribution of the battery cell is not uniform in actual use. The thermal conductivity of the battery cell is anisotropic, and the internal heat is mainly transferred outward along the large surface along the metal foil, adapter, and pole, which makes the heat most concentrated in the battery top cover area, increasing the risk of reduced battery performance or safety accidents.

[0004] In summary, how to effectively liquid-cool the battery cells while ensuring the energy density and space utilization of the battery cells and assembly system has become a problem that needs to be solved urgently. For the whole PACK-level structure, the mainstream method in the prior art is to add a liquid cooling plate to the bottom of the entire battery pack to control the temperature of the battery cells. The outside of the liquid cooling plate is usually steel or aluminum, and the inside has a hollow flow channel design. In actual work, the water-cooling plate is in contact with the lower surface of the battery cell, and the heat is taken away with the flow of the coolant medium. First, the liquid cooling plate placed at the bottom is only in contact with the lower surface of the battery cell, but the heat generated by the battery cell is usually concentrated on the large surface and the pole position, and the heat dissipation efficiency at the bottom is too low; secondly, the multi-layer structure between the coolant and the battery also greatly reduces the liquid cooling effect; in addition, the separate liquid cooling plate structure needs to occupy more battery pack space, especially in the height direction, which compresses the usable design area of ​​the battery pack.

[0005] The "Kirin" battery pack launched by CATL in the prior art uses a large-surface water cooling method for the battery cells to improve the overall heat dissipation efficiency of the battery pack. However, this structure requires the installation of a liquid cooling plate between the battery cells, which squeezes the horizontal available space of the battery pack.

[0006] The above information disclosed in the background technology section is only used to enhance the understanding of the background of the present invention and therefore may contain information that does not constitute the prior art known to ordinary technicians in this field. Utility Model Content

[0007] The utility model aims to provide a battery core structure with liquid cooling, which has good cooling effect and does not occupy the horizontal and vertical space of the battery pack.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A battery core structure with liquid cooling of the utility model comprises:

[0010] an outer shell having a top opening;

[0011] At least one core package, which is accommodated in the outer shell through the opening, and the top of the core package is provided with a pole ear;

[0012] The liquid cooling plate is a hollow channel structure, and the liquid cooling plate comprises:

[0013] The top liquid cooling part is provided with a pole opening, an explosion-proof valve opening, a first liquid injection hole and a liquid cooling flow channel.

[0014] The surface liquid cooling part extends downward from both sides of the top liquid cooling part to between the core package and the outer shell;

[0015] a cover plate, which is arranged on the top liquid cooling part and is sealed to the outer shell, the cover plate includes a pole area aligned with the pole opening, an explosion-proof valve aligned with the explosion-proof valve opening, a second liquid injection hole aligned with the first liquid injection hole, and a liquid cooling channel opening aligned with the liquid cooling channel,

[0016] The adapter plate is arranged between the core package and the liquid cooling plate, and the adapter plate includes a pole ear connection area connected to the pole ear and a pole connection area, and the pole connection area is connected to the pole area via the pole opening.

[0017] In the battery core structure with liquid cooling, the top liquid cooling part is a horizontal plate with a serpentine coil inside.

[0018] In the battery core structure with liquid cooling, the liquid cooling channel is provided with a buckle structure, and the buckle structure is provided with an inner groove, which is sealed and connected to the liquid cooling channel via a sealant. In the battery core structure with liquid cooling, the surface liquid cooling part is a sandwich hollow structure.

[0019] In the battery core structure with liquid cooling, the surface liquid cooling part is snap-connected and liquid is connected to the top liquid cooling part.

[0020] In the battery core structure with liquid cooling, the tab connection area is a concave plate structure.

[0021] In the battery core structure with liquid cooling, the pole connection area includes a cylindrical structure that passes through the pole opening and connects the pole area.

[0022] In the battery core structure with liquid cooling, the outer shell is a square structure, and the battery core structure with liquid cooling is a symmetrical structure.

[0023] In the liquid-cooled battery core structure, aerogel is provided between the core packages.

[0024] In the battery core structure with liquid cooling, the liquid cooling pipe structure connects multiple liquid injection sealing structures arranged in sequence, and the liquid cooling pipe structure includes a total flow inlet, multiple flow channel connecting ports connected to the total flow inlet, and a total flow outlet, and the flow channel connecting ports are connected to the liquid cooling flow channel.

[0025] In the above technical scheme, the utility model provides a battery cell structure with liquid cooling, which has the following beneficial effects: the utility model designs a water cooling structure for the top and large surface area of ​​the battery cell, which is integrated into the battery cell structure to improve the heat dissipation efficiency; the components are connected via a snap-on method, the battery cell assembly method is flexible, and the adaptability is high, and through the battery cell structure and battery cell assembly, and the external liquid cooling flow channel design, the top of the battery cell is liquid cooled to perform targeted temperature control on the heat generation concentrated area; while improving the heat dissipation efficiency, the assemblability and adaptability of the battery cell assembly in the battery pack are guaranteed; aerogel is introduced between the battery cells to enhance the structural stability and reduce the overall thermal runaway risk of the battery pack, without occupying the lateral and longitudinal space of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0027] Figure 1 An overall structural schematic diagram of a battery core structure with liquid cooling provided in an embodiment of the utility model.

[0028] Figure 2 A schematic diagram of an exploded structure of a battery core structure with liquid cooling provided in an embodiment of the utility model.

[0029] Figure 3 A schematic structural diagram of a cover plate with a liquid-cooled battery cell structure provided in an embodiment of the utility model.

[0030] Figure 4 A schematic diagram of a switching plate structure with a liquid-cooled battery cell structure provided in an embodiment of the utility model.

[0031] Figure 5 A schematic structural diagram of a liquid cooling plate with a liquid-cooled battery core structure provided in an embodiment of the utility model.

[0032] Figure 6 A schematic diagram of a battery cell assembly structure with a liquid-cooled battery cell structure provided in an embodiment of the utility model.

[0033] Figure 7 A structural schematic diagram of a liquid cooling tube structure with a liquid-cooled battery core structure provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] See also Figure 1-7 As shown, in one embodiment, a battery core structure with liquid cooling of the utility model includes:

[0043] An outer shell 501 having a top opening;

[0044] At least one core package 401, which is accommodated in the outer shell 501 through the opening, and the top of the core package 401 is provided with a pole ear;

[0045] The liquid cooling plate 201 is a hollow channel structure, and the liquid cooling plate 201 includes:

[0046] The top liquid cooling part is provided with a pole opening 202, an explosion-proof valve opening 203, a first liquid injection hole 204 and a liquid cooling channel 205.

[0047] The surface liquid cooling part 207 extends downward from both sides of the top liquid cooling part to between the core package 401 and the outer shell 501;

[0048] A cover plate 101 is provided on the top liquid cooling part and is sealed to the outer shell 501. The cover plate 101 includes a pole region 102 aligned with the pole opening 202, an explosion-proof valve 104 aligned with the explosion-proof valve opening 203, a second liquid injection hole 103 aligned with the first liquid injection hole 204, and a liquid cooling channel opening 105 aligned with the liquid cooling channel 205.

[0049] The adapter plate 301 is disposed between the core package 401 and the liquid cooling plate 201 . The adapter plate 301 includes a pole lug connection area 303 connected to the pole lug and a pole connection area 302 . The pole connection area 302 is connected to the pole region 102 via the pole opening 202 .

[0050] In a preferred embodiment of the battery core structure with liquid cooling, the top liquid cooling part is a horizontal plate with a serpentine coil inside.

[0051] In a preferred embodiment of the battery core structure with liquid cooling, the liquid cooling channel 205 is provided with a snap-fit ​​structure 206 , and the snap-fit ​​structure 206 is provided with an inner groove, which is sealed and connected to the liquid cooling channel 205 via a sealant.

[0052] In a preferred embodiment of the battery core structure with liquid cooling, the surface liquid cooling portion 207 is a sandwich hollow structure.

[0053] In a preferred embodiment of the battery core structure with liquid cooling, the surface liquid cooling portion 207 is snap-connected and liquid-connected to the top liquid cooling portion.

[0054] In a preferred embodiment of the battery core structure with liquid cooling, the tab connection area 303 is a concave plate structure.

[0055] In a preferred embodiment of the battery cell structure with liquid cooling, the pole connection area 302 includes a cylindrical structure that passes through the pole opening 202 and is connected to the pole region 102 .

[0056] In a preferred embodiment of the battery core structure with liquid cooling, the outer shell 501 is a square structure, and the battery core structure with liquid cooling is a symmetrical structure.

[0057] In a preferred embodiment of the battery core structure with liquid cooling, aerogel is provided between the core packages 401 .

[0058] In a preferred embodiment of the battery cell structure with liquid cooling, the liquid cooling pipe structure 601 connects multiple liquid injection sealing structures arranged in sequence, and the liquid cooling pipe structure 601 includes a total flow inlet 602, multiple channel connecting ports 603 connected to the total flow inlet 602, and a total flow outlet 604, and the channel connecting port 603 is connected to the liquid cooling channel 205.

[0059] In one embodiment, Figure 1 , Figure 2 As shown, the battery cell adopts a double-core package with a single-side terminal ear on the top, and the components are connected and combined by ultrasonic welding, laser welding, etc. The battery cell as a whole is respectively composed of an aluminum cover plate 101, a liquid cooling plate 201, an adapter plate 301, a core package 401, and an outer shell 501; the cover plate 101 includes a pole area 102, a second liquid injection hole 103, an explosion-proof valve 104, and a liquid cooling channel opening 105; the liquid cooling plate 201 is a hollow channel design, including a pole opening 202, an explosion-proof valve opening 203, a first liquid injection hole 204, a liquid cooling channel 205, a snap structure 206 (an inner groove containing sealant), and a surface liquid cooling part 207; the surface liquid cooling part 207 itself is a sandwich hollow plastic structure, which can be connected and combined with the liquid cooling plate 201 as a whole by hot welding or snap-on connection to facilitate processing and molding; the adapter plate 301 includes a pole connection area 302 and a pole ear connection area 303.

[0060] The cover plate 101, the liquid cooling plate 201 and the adapter plate 301 are longitudinally positioned so that the explosion-proof valve 104 is aligned with the explosion-proof valve opening 204, the second liquid injection hole 103 is aligned with the first liquid injection hole 204, the pole area 102 is aligned with the pole connection area 302, and the liquid cooling channel opening 105 is aligned with the liquid cooling channel 205; the aluminum cover plate 101 is connected to the adapter plate 301 by laser welding, and the liquid cooling plate 201 is fixed by means of an intermediate limiter; the top pole ear of the core package 401 is connected to the previous structure by ultrasonic welding; the structure is combined with the outer shell 501, and the core package is located at the center of the liquid cooling part 207 on both sides after being put into the shell; after the combination is completed, the contact part of the cover plate 101 and the outer shell 501 is sealed by laser welding, and the overall assembly of the battery cell is completed.

[0061] The positive and negative poles of multiple battery cells are arranged in opposite ways, the battery cells are separated by aerogel, and the top is electrically connected using external connecting pieces.

[0062] like Figure 7 As shown, the liquid cooling pipe structure 601 includes a total flow inlet 602, a flow channel connection port 603, and a total flow outlet 604. The liquid cooling pipe structure 601 cooperates with the liquid cooling flow channel 205 of the battery cell to control the inflow and outflow of liquid cooling water, respectively, and finally realizes liquid cooling of the top and two sides of the battery cell.

[0063] Finally, it should be noted that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present application.

[0064] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A battery cell structure with liquid cooling, characterized in that: These include, an outer shell having a top opening; At least one core package, which is accommodated in the outer shell through the opening, and the top of the core package is provided with a pole ear; The liquid cooling plate is a hollow channel structure, and the liquid cooling plate comprises: The top liquid cooling part is provided with a pole opening, an explosion-proof valve opening, a first liquid injection hole and a liquid cooling flow channel. The surface liquid cooling part extends downward from both sides of the top liquid cooling part to between the core package and the outer shell; a cover plate, which is arranged on the top liquid cooling part and is sealed to the outer shell, the cover plate includes a pole area aligned with the pole opening, an explosion-proof valve aligned with the explosion-proof valve opening, a second liquid injection hole aligned with the first liquid injection hole, and a liquid cooling channel opening aligned with the liquid cooling channel, The adapter plate is arranged between the core package and the liquid cooling plate, and the adapter plate includes a pole ear connection area connected to the pole ear and a pole connection area, and the pole connection area is connected to the pole area via the pole opening.

2. A battery core structure with liquid cooling according to claim 1, characterized in that: The top liquid cooling part is a horizontal plate with a serpentine coil inside.

3. The battery core structure with liquid cooling according to claim 1, characterized in that: The liquid cooling channel is provided with a buckle structure, and the buckle structure is provided with an inner groove, which is sealed and connected to the liquid cooling channel via a sealant.

4. The battery core structure with liquid cooling according to claim 1, characterized in that: The surface liquid cooling part is a sandwich hollow structure.

5. The battery core structure with liquid cooling according to claim 1, characterized in that: The surface liquid cooling part is snap-connected and liquid-connected to the top liquid cooling part.

6. The battery core structure with liquid cooling according to claim 1, characterized in that: The tab connection area is a concave plate structure.

7. The battery core structure with liquid cooling according to claim 1, characterized in that: The pole connection area includes a cylindrical structure that passes through the pole opening and connects the pole area.

8. The battery core structure with liquid cooling according to claim 1, characterized in that: The outer shell is a square structure, and the battery core structure with liquid cooling is a symmetrical structure.

9. The battery core structure with liquid cooling according to claim 1, characterized in that: Aerogel is arranged between the core packages.

10. The battery core structure with liquid cooling according to claim 1, characterized in that: The liquid cooling pipe structure comprises a total flow inlet, a plurality of flow channel connecting ports connected to the total flow inlet, and a total flow outlet, and the flow channel connecting ports are connected to the liquid cooling flow channel.

Images