Battery cell assembly and battery module

Abstract

The utility model discloses a battery cell component which comprises a battery cell and a heat conduction buffer piece, the heat conduction buffer piece is provided with an installation cavity, the heat conduction buffer piece has a thickness direction, the installation cavity penetrates through the heat conduction buffer piece in the thickness direction of the heat conduction buffer piece, and the battery cell is installed in the installation cavity. And the periphery of the battery cell is connected with the inner wall of the heat-conducting buffer part. According to the utility model, the heat of the battery cell can be quickly transferred, the heat is prevented from being accumulated in the battery cell, and the heat conduction effect of the battery cell is improved. The utility model further discloses a battery module.

Description

Technical Field

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

[0002] With the rapid development of electric vehicles, in the application of liquid cooling technology for soft-pack battery cells, after the battery cells are arranged into groups, the heat generated by the battery cells is easily accumulated because the battery cells are stacked together, causing the battery temperature to rise, which in turn affects the battery life. Utility Model Content

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a battery cell assembly and a battery module that can quickly transfer the heat of the battery cell, prevent heat from accumulating inside the battery cell, and improve the thermal conductivity of the battery cell; and the thermally conductive buffer can play a role in fixing and protecting the periphery of the battery cell, with good protection effect.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A battery cell assembly includes a battery cell and a thermally conductive buffer, wherein the thermally conductive buffer is provided with a mounting cavity, the thermally conductive buffer has a thickness direction, and the mounting cavity penetrates the thermally conductive buffer along the thickness direction of the thermally conductive buffer. The battery cell is installed in the mounting cavity, and the outer periphery of the battery cell is connected to the inner wall of the thermally conductive buffer.

[0006] In one embodiment, a slot is provided on the inner wall of the thermally conductive buffer component, and the outer periphery of the battery cell is plug-connected to the slot.

[0007] In one embodiment, the battery cell includes a tab, and an opening and / or a through hole for the tab to pass through is provided on a side of the thermally conductive buffer corresponding to the tab.

[0008] In one embodiment, the thermally conductive buffer comprises a plurality of thermally conductive rods, which are connected end to end to form the thermally conductive buffer having the mounting cavity; the battery cell comprises tabs, and the thermally conductive rods corresponding to the positions of the tabs are provided with openings and / or through holes for the tabs to pass through.

[0009] The present invention also provides a battery module, comprising a heat-conducting shell and a plurality of battery cell assemblies as described above, wherein the plurality of battery cell assemblies are arranged in sequence along the thickness direction of the heat-conducting buffer member to form a battery cell structure, and the battery cell structure is installed in the heat-conducting shell, and at least a portion of each of the heat-conducting buffer members is in contact with the inner wall of the heat-conducting shell.

[0010] In one embodiment, the heat-conducting housing includes an end plate and a heat-conducting plate, and the end plate and the heat-conducting plate surround the battery core structure.

[0011] In one embodiment, the battery cell structure has a first direction and a second direction, the first direction is perpendicular to the second direction, and the first direction is parallel to the thickness direction of the thermally conductive buffer; the end plate includes a first end plate and a second end plate arranged opposite to each other, and the first end plate and the second end plate are arranged on both sides of the battery cell structure in the first direction.

[0012] In one embodiment, a mounting groove is formed on a side of the first end plate away from the battery core structure, and a controller is disposed in the mounting groove.

[0013] In one embodiment, the heat conducting plate includes an upper heat conducting plate and a lower heat conducting plate, and the upper heat conducting plate and the lower heat conducting plate are arranged on both sides of the battery core structure in the second direction. The lower heat conducting plate is a U-shaped structure, and the battery core structure is placed on the lower heat conducting plate. The two ends of the lower heat conducting plate in the first direction are respectively connected to the first end plate and the second end plate. The upper heat conducting plate is arranged on the top of the lower heat conducting plate and is connected to the lower heat conducting plate, the first end plate and the second end plate; the outer wall of the thermal conductive buffer is in contact with the lower heat conducting plate.

[0014] In one embodiment, a liquid cooling plate is installed on a side of the upper heat conducting plate away from the battery core structure.

[0015] In one embodiment, the second end plate is provided with a cavity and a liquid outlet. A cooling medium is provided in the cavity. When thermal runaway occurs in the battery cell structure, the cooling medium can be ejected from the liquid outlet.

[0016] In one embodiment, the liquid outlet is provided with a liquid outlet pipe, and the liquid outlet pipe seals the liquid outlet; the liquid outlet pipe is a temperature-sensing structure. When thermal runaway occurs in the battery cell structure, when the temperature of the second end plate rises to a temperature greater than the melting temperature of the liquid outlet pipe, the liquid outlet pipe melts and the cooling medium is ejected.

[0017] The beneficial effects of the utility model are as follows: by installing the battery core in the installation cavity of the thermally conductive buffer component, the outer peripheral surface of the battery core can be in contact with the thermally conductive buffer component, and the heat in the battery core is discharged through the thermally conductive buffer component, thereby improving the thermal conductivity effect and preventing heat from accumulating in the battery core and affecting the normal operation of the battery core; and the thermally conductive buffer component can play a role in fixing and protecting the outer periphery of the battery core, and the protection effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a structural schematic diagram of a battery module according to an embodiment of the present utility model;

[0020] Figure 2 yes Figure 1 Exploded diagram;

[0021] Figure 3 yes Figure 1 Schematic diagram of the structure of the battery cell assembly;

[0022] Figure 4 yes Figure 3 Exploded image;

[0023] Figure 5 yes Figure 4 A local enlarged view at P;

[0024] Figure 6 yes Figure 3 A partial cross-sectional view of

[0025] Figure 7 is a schematic cross-sectional view of a thermally conductive buffer member according to another embodiment;

[0026] Figure 8 is a schematic cross-sectional view of a thermally conductive buffer member according to another embodiment;

[0027] Figure 9 yes Figure 2 Exploded diagram of the first end plate and controller in FIG.

[0028] In the figure: 100, battery cell structure; 1, battery cell assembly; 11, battery cell; 111, tab; 12, thermal buffer; 121, mounting cavity; 122, slot; 123, opening; 124, through hole; 125, thermal rod; 2, thermal shell; 21, end plate; 211, first end plate; 211A, mounting groove; 211B, cover plate; 212, second end plate; 212A, liquid outlet pipe; 212B, liquid inlet pipe; 22, thermal plate; 221, upper thermal plate; 222, lower thermal plate; 3, controller; 4, liquid cooling plate; 5, bus. DETAILED DESCRIPTION

[0029] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the description of the present invention, all other embodiments derived by persons of ordinary skill in the art without inventive effort are also within the scope of protection of the present invention.

[0030] In the description of this utility model, unless otherwise specified or limited, the terms "disposed," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms based on the specific circumstances.

[0031] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the utility model.

[0032] The terms "first," "second," "third," etc. are merely used to distinguish elements of similar nature and do not indicate or imply relative importance or a particular order.

[0033] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0034] The utility model provides a battery core assembly 1, such as Figures 1 to 4 As shown, the embodiment includes a battery cell 11 and a thermally conductive buffer member 12. The thermally conductive buffer member 12 is provided with a mounting cavity 121. The thermally conductive buffer member 12 has a thickness direction D. The mounting cavity 121 extends through the thermally conductive buffer member 12 along the thickness direction D of the thermally conductive buffer member 12. The battery cell 11 is mounted within the mounting cavity 121, and the outer periphery of the battery cell 11 is connected to the inner wall of the thermally conductive buffer member 12. In this embodiment, by mounting the battery cell 11 within the mounting cavity 121 of the thermally conductive buffer member 12, the outer periphery of the battery cell 11 is in contact with the inner wall of the thermally conductive buffer member 12, and the heat within the battery cell 11 is conducted away through the thermally conductive buffer member 12, thereby improving the heat conduction effect and preventing heat accumulation within the battery cell 11 that could affect its normal operation. Furthermore, the thermally conductive buffer member 12 can provide a fixed and protective function for the outer periphery of the battery cell 11, providing good protective effect.

[0035] As an implementation method, Figures 3 to 6 As shown, a slot 122 is formed on the inner wall of the thermally conductive buffer 12 , and the outer periphery of the battery cell 11 is plugged into and connected to the slot 122 .

[0036] As an implementation method, Figure 4 、 Figure 7 and Figure 8 As shown, the battery cell 11 includes a tab 111, and an opening 123 and / or a through hole 124 for the tab 111 to pass through is provided on one side of the thermally conductive buffer 12 corresponding to the tab 111. When the battery cell 11 is inserted into the thermally conductive buffer 12, the tab 111 of the battery cell 11 passes through the opening 123 on the thermally conductive buffer 12, or passes through the thermally conductive buffer 12 through the corresponding through hole 124. Specifically, as Figure 4 As shown, when two tabs 111 are provided on one side of the tab 111, a larger opening 123 may be provided on the thermally conductive buffer 12 corresponding to the two tabs 111, and the two tabs 111 may pass through the opening 123 together; or Figure 7 As shown, a through hole 124 is provided for each of the two tabs 111, and the two tabs 111 pass through the corresponding through holes 124 respectively; or Figure 8 As shown, an opening 123 is provided corresponding to one of the tabs 111 , and a through hole 124 is provided corresponding to the other tab 111 . One tab 111 passes through the opening 123 , and the other passes through the through hole 124 .

[0037] As an implementation method, Figure 4 、 Figure 7 and Figure 8 As shown, the thermally conductive buffer 12 includes a plurality of thermally conductive rods 125, which are connected end to end to form a thermally conductive buffer 12 having a mounting cavity 121. The battery cell 11 includes a tab 111, and the thermally conductive rods 125 corresponding to the tab 111 are provided with openings 123 and / or through-holes 124 for the tab 111 to pass through. Specifically, the thermally conductive buffer 12 includes four thermally conductive rods 125, which are assembled to form a ring-shaped square structure. The thermally conductive rods 125 corresponding to the tab 111 are provided with through-holes 124 and / or openings 123. After the battery cell 11 is installed in the mounting cavity 121, the tab 111 passes through the thermally conductive buffer 12 through the through-holes 124 and / or openings 123.

[0038] The utility model also provides a battery module, such as Figure 1 and Figure 2As shown, it includes a heat-conducting shell 2 and multiple battery cell assemblies 1 as described above. The multiple battery cell assemblies 1 are arranged in sequence along the thickness direction D of the heat-conducting buffer 12 to form a battery cell structure 100. The battery cell structure 100 is installed in the heat-conducting shell 2. At least part of each heat-conducting buffer 12 is in contact with the inner wall of the heat-conducting shell 2, so that the heat of each battery cell 11 can be discharged out of the battery cell structure 100 through the heat-conducting buffer 12 and the heat-conducting shell 2 in sequence, avoiding the heat of each battery cell 11 from accumulating inside the battery cell structure 100, so as to improve the working stability of the battery module.

[0039] As an implementation method, Figure 1 and Figure 2 As shown, the thermally conductive housing 2 includes an end plate 21 and a thermally conductive plate 22, which enclose the battery cell structure 100. Specifically, the end plate 21 and the thermally conductive plate 22 are interconnected to form a rectangular parallelepiped structure with a cavity. The battery cell structure 100 is installed in the thermally conductive housing 2, and at least a portion of each thermally conductive buffer 12 is aligned with the thermally conductive housing 2, so that the heat of the battery cell 11 is discharged through the thermally conductive buffer 12 and the thermally conductive housing 2, thereby improving the thermal conductivity.

[0040] As an implementation method, Figure 1 、 Figure 2 and Figure 9 As shown, the battery cell structure 100 has a first direction X and a second direction Y, the first direction X and the second direction Y being perpendicular, and the first direction X being parallel to the thickness direction D of the thermally conductive buffer 12. The end plate 21 includes a first end plate 211 and a second end plate 212, which are arranged opposite each other on either side of the battery cell structure 100 in the first direction X. The first end plate 211 has a mounting slot 211A defined on a side facing away from the battery cell structure 100, and the controller 3 is disposed within the mounting slot 211A. The first end plate 211 also includes a cover plate 211B disposed on the mounting slot 211A to reduce collisions between the controller 3 and external objects during movement or operation of the battery module, thereby preventing damage to the controller 3. The controller 3 can directly process the collected voltage and temperature data and forward and receive BMS main control signals, thereby reducing external signal interference and improving space utilization.

[0041] As an implementation method, Figure 1 and Figure 2As shown, the heat conducting plate 22 includes an upper heat conducting plate 221 and a lower heat conducting plate 222, and the upper heat conducting plate 221 and the lower heat conducting plate 222 are arranged on both sides of the battery cell structure 100 in the second direction Y. The lower heat conducting plate 222 is a U-shaped structure, and the battery cell structure 100 is placed on the lower heat conducting plate 222. The two ends of the lower heat conducting plate 222 in the first direction X are respectively connected to the first end plate 211 and the second end plate 212, and the upper heat conducting plate 221 is arranged on the top of the lower heat conducting plate 222 and is connected to the lower heat conducting plate 222, the first end plate 211 and the second end plate 212 to obtain a sealed heat conducting shell 2; the outer wall of the heat conducting buffer 12 is in contact with the lower heat conducting plate 222, so that the heat inside the battery cell 11 can be discharged to the periphery through the heat conducting buffer 12 and the lower heat conducting plate 222, thereby avoiding heat accumulation inside the battery cell 11.

[0042] As an implementation method, Figure 1 and Figure 2 As shown, a liquid cooling plate 4 is installed on the side of the upper heat conducting plate 221 away from the cell structure 100 to absorb heat conducted away from the upper heat conducting plate 221. The upper heat conducting plate 221 corresponds to the side of the cell structure 100 where the tabs 111 are arranged. Since the temperature of the cell 11 is higher on the tab 111 side, the liquid cooling plate 4 is installed on the upper heat conducting plate 221 on the tab 111 side. Heat on the tab 111 side of the cell 11 can be conducted away through the thermal buffer 12, the upper heat conducting plate 221, and the liquid cooling plate 4, improving heat conduction and cooling. The liquid cooling plate 4 can be a water-cooled plate.

[0043] As an embodiment, the second end plate 212 is provided with a cavity (not shown) and a liquid outlet (not shown), and a cooling medium is provided in the cavity. When the battery cell structure 100 experiences thermal runaway, the cooling medium can be ejected from the liquid outlet, thereby cooling the battery cell structure 100 and extinguishing the fire. Figure 2 As shown, the second end plate 212 is further provided with a liquid inlet pipe 212B, through which the cooling medium is input into the second end plate 212 .

[0044] As an implementation method, Figure 2 As shown, the liquid outlet is provided with a liquid outlet pipe 212A, and the liquid outlet pipe 212A seals the liquid outlet; the liquid outlet pipe 212A is a temperature-sensing structure. When the battery cell structure 100 has thermal runaway, the temperature of the second end plate 212 rises to a temperature greater than the melting temperature of the liquid outlet pipe 212A, the liquid outlet pipe 212A melts, and the cooling medium is sprayed out; when the battery cell structure 100 is operating normally, the temperature of the second end plate 212 is lower than the melting temperature of the liquid outlet pipe 212A, the liquid outlet pipe 212A seals the liquid outlet, and the second end plate 212 can be used as a cooling plate to cool the battery cell structure 100, so that the battery cell structure 100 can maintain a normal operating temperature.

[0045] As an implementation method, Figure 2As shown, the battery module also includes a bus 5, which is arranged at the top of the battery cell structure 100. The bus 5 is arranged on the top of the thermally conductive buffer 12. The bus 5 is provided with a pole ear connection hole (not shown) at the position corresponding to each pole ear 111 for connecting each pole ear 111.

[0046] The utility model arranges a heat-conducting buffer member 12 on the outer ring of each battery cell 11. The heat-conducting buffer member 12 is in direct contact with the four surfaces of the outer periphery of the battery cell 11, so that the heat of the battery cell 11 can be quickly transferred to prevent the heat from accumulating inside the battery cell 11, thereby improving the buffering and heat-conducting effect of the battery cell 11; the heat-conducting buffer member 12 improves the heat dissipation effect of the battery cell 11 and has a good buffering effect itself, which can effectively protect the battery cell 11.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to the technical content disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A battery cell assembly, characterized in that: The invention comprises a battery core (11) and a heat-conducting buffer (12), wherein the heat-conducting buffer (12) is provided with a mounting cavity (121), the heat-conducting buffer (12) has a thickness direction (D), and along the thickness direction (D) of the heat-conducting buffer (12), the mounting cavity (121) penetrates the heat-conducting buffer (12), the battery core (11) is mounted in the mounting cavity (121), and the outer periphery of the battery core (11) is connected to the inner wall of the heat-conducting buffer (12).

2. The battery cell assembly according to claim 1, wherein: A slot (122) is provided on the inner wall of the heat-conducting buffer member (12), and the outer periphery of the battery core (11) is plug-connected to the slot (122).

3. The battery cell assembly according to claim 1, wherein: The battery core (11) includes a pole lug (111), and an opening (123) and / or a through hole (124) for the pole lug (111) to pass through is provided on a side of the thermally conductive buffer member (12) corresponding to the pole lug (111).

4. The battery cell assembly according to claim 1, wherein: The thermally conductive buffer (12) comprises a plurality of thermally conductive rods (125), and the plurality of thermally conductive rods (125) are connected end to end to form the thermally conductive buffer (12) having the mounting cavity (121); the battery cell (11) comprises a tab (111), and the thermally conductive rods (125) corresponding to the positions of the tabs (111) are provided with openings (123) and / or through holes (124) for the tabs (111) to pass through.

5. A battery module, characterized in that: The invention comprises a heat-conducting shell (2) and a plurality of battery cell assemblies (1) according to any one of claims 1 to 4, wherein the plurality of battery cell assemblies (1) are arranged in sequence along the thickness direction (D) of the heat-conducting buffer (12) to form a battery cell structure (100), and the battery cell structure (100) is installed in the heat-conducting shell (2), and at least a portion of each heat-conducting buffer (12) is in contact with the inner wall of the heat-conducting shell (2).

6. The battery module according to claim 5, wherein: The heat-conducting housing (2) comprises an end plate (21) and a heat-conducting plate (22), and the end plate (21) and the heat-conducting plate (22) enclose the battery core structure (100).

7. The battery module according to claim 6, wherein: The battery cell structure (100) has a first direction (X) and a second direction (Y), the first direction (X) and the second direction (Y) are perpendicular, and the first direction (X) is parallel to the thickness direction (D) of the thermally conductive buffer component (12); the end plate (21) comprises a first end plate (211) and a second end plate (212) that are arranged opposite to each other, and the first end plate (211) and the second end plate (212) are arranged on both sides of the battery cell structure (100) in the first direction (X).

8. The battery module according to claim 7, wherein: A mounting groove (211A) is provided on a side of the first end plate (211) away from the battery core structure (100), and a controller (3) is provided in the mounting groove (211A).

9. The battery module according to claim 7, wherein: The heat conducting plate (22) comprises an upper heat conducting plate (221) and a lower heat conducting plate (222); the upper heat conducting plate (221) and the lower heat conducting plate (222) are arranged on both sides of the battery core structure (100) in the second direction (Y); the lower heat conducting plate (222) is a U-shaped structure; the battery core structure (100) is placed on the lower heat conducting plate (222); the two ends of the lower heat conducting plate (222) in the first direction (X) are respectively connected to the first end plate (211) and the second end plate (212); the upper heat conducting plate (221) is arranged on the top of the lower heat conducting plate (222) and is connected to the lower heat conducting plate (222), the first end plate (211) and the second end plate (212); the outer wall of the heat conducting buffer (12) is in contact with the lower heat conducting plate (222).

10. The battery module according to claim 9, wherein: A liquid cooling plate (4) is installed on a side of the upper heat conducting plate (221) away from the battery core structure (100).

11. The battery module according to claim 7, wherein: The second end plate (212) is provided with a cavity and a liquid outlet. A cooling medium is provided in the cavity. When thermal runaway occurs in the battery core structure (100), the cooling medium can be ejected from the liquid outlet.

12. The battery module according to claim 11, wherein: The liquid outlet is provided with a liquid outlet pipe (212A), and the liquid outlet pipe (212A) seals the liquid outlet; the liquid outlet pipe (212A) is a temperature-sensing structure, and when the battery core structure (100) experiences thermal runaway, the temperature of the second end plate (212) rises to a temperature greater than the melting temperature of the liquid outlet pipe (212A), the liquid outlet pipe (212A) melts, and the cooling medium is ejected.

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