Battery cell, battery pack and vehicle

Abstract

The utility model provides a battery cell, battery pack and vehicle relates to automobile battery field, said battery cell includes shell, cover plate, pole core, pole post and heat conducting glue, pole core is provided in the shell, pole core is close to the end of cover plate and is equipped with pole ear, one end of pole post passes through cover plate and is connected with pole ear, the clearance between pole core and cover plate is filled with heat conducting glue, and the heat conducting glue is filled with heat conducting glue. And the heat-conducting glue is in contact with the pole and / or the tab, and is in contact with the cover plate and / or the shell. The heat-conducting glue is filled at the end part, close to the cover plate, of the pole core, namely the end part, provided with the pole lug, of the pole core, and the gap between the shell and the cover plate, so that heat generated by the pole lug and / or the pole column can be quickly transferred to the shell and / or the cover plate through the heat-conducting glue in the working process of the battery cell until reaching the external environment; the heat dissipation effect of the end part of the battery cell in the length direction is improved, the overall temperature difference of the battery cell is smaller, the performance of the battery cell is improved, and the service life of the battery cell is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of automobile batteries, and in particular to a battery cell, a battery pack and a vehicle. Background Art

[0002] As users' requirements for vehicle charging time increase, the charging rate is getting higher and higher, even reaching 5C, causing the battery cell to face the problem of excessive maximum temperature during the charging process. The battery cell is provided with tabs at one or both ends along the length direction. According to measured data, during the charging process, the maximum temperature of the end of the length direction of the battery cell, that is, near the tab, has exceeded 70°C, and the temperature difference with other positions inside the battery cell is close to 20°C. The temperature distribution is extremely uneven, which seriously affects the performance and life of the battery cell. Utility Model Content

[0003] The utility model aims to solve the technical problem that the temperature of the two ends of the existing battery core along the length direction is too high, which affects the service life of the battery core.

[0004] In a first aspect, the utility model provides a battery cell, comprising a shell, a cover plate, a pole core, a pole post and thermally conductive adhesive, wherein the pole core is arranged in the shell, and a pole ear is provided at the end of the pole core close to the cover plate, one end of the pole post passes through the cover plate to be connected to the pole ear, and the gap between the pole core and the cover plate is filled with the thermally conductive adhesive, and the thermally conductive adhesive is in contact with the pole post and / or the pole ear, and in contact with the cover plate and / or the shell.

[0005] Optionally, the battery cell further comprises an isolation cover, wherein the isolation cover is arranged on a side of the pole core close to the cover plate, and the thermal conductive adhesive is filled between the isolation cover and the cover plate.

[0006] Optionally, the isolation cover is provided with a receiving cavity with an opening toward one side of the cover plate, the thermal conductive adhesive is filled in the receiving cavity, and the cover plate is connected to the isolation cover and in contact with the thermal conductive adhesive.

[0007] Optionally, a glue injection hole is provided on the cover plate, and the glue injection hole is communicated with the accommodating cavity.

[0008] Optionally, a through hole is provided at the bottom of the accommodating cavity, a conductive block is provided at one end of the pole extending into the cover plate, and the pole ear passes through the through hole to be connected to the conductive block.

[0009] Optionally, one end of the pole ear passes through the through hole and is then bent to form a flange, and the flange is fitted and connected to the conductive block.

[0010] Optionally, openings are respectively provided at both ends of the shell along the length direction, and the two cover plates are respectively covered on the corresponding openings.

[0011] The battery cell of the utility model has at least the following advantages compared with the prior art:

[0012] By filling the gap between the pole core and the cover plate with thermal conductive adhesive, the thermal conductive adhesive may fill the entire gap between the pole core and the cover plate, or may not fill the entire gap, that is, the thermal conductive adhesive is in contact with the pole column and / or the pole ear, and is in contact with the cover plate and / or the shell. During the operation of the battery cell, the heat generated by the pole ear and / or the pole column can be transferred to the shell and / or the cover plate more quickly through the thermal conductive adhesive, and then to the external environment, thereby improving the heat dissipation effect of the end of the battery cell along the length direction, and the overall temperature difference of the battery cell is smaller, which is conducive to improving the performance of the battery cell and extending the service life of the battery cell. At the same time, the thermal conductive adhesive has good fluidity and can be better filled at the end of the pole core, further ensuring the heat dissipation effect.

[0013] In a second aspect, the utility model provides a battery pack, comprising the above-mentioned battery cell.

[0014] The battery pack of the utility model fills the gaps between the two ends of the battery core and the shell and the cover with thermal conductive adhesive. When the battery core is in operation, the heat generated by the pole ears and poles at both ends can be transferred to the shell, the cover and even the external environment more quickly through the thermal conductive adhesive, thereby improving the heat dissipation effect at both ends of the battery core and reducing the overall temperature difference of the battery core, which is beneficial to improving the performance of the battery core and the battery pack and extending the service life of the battery core and the battery pack.

[0015] Optionally, the battery pack further comprises a liquid cooling plate, wherein the liquid cooling plate contacts one side of the shell of the battery cell, and the thermal conductive adhesive is arranged close to the side of the shell contacting the liquid cooling plate.

[0016] In a third aspect, the utility model provides a vehicle, comprising the above-mentioned battery pack.

[0017] The vehicle described in the utility model fills thermally conductive adhesive in the gaps between the two ends of the pole core of the battery cell of the battery pack and the shell and the cover plate. During the operation of the battery cell, the heat generated by the pole ears and poles at both ends of the battery cell can be transferred to the shell, the cover plate and even the external environment more quickly through the thermally conductive adhesive, thereby improving the heat dissipation effect at both ends of the battery cell, and the overall temperature difference of the battery cell is smaller, which is beneficial to improving the performance of the battery cell and the battery pack and extending the service life of the battery cell and the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A simplified structural diagram of a battery cell according to an embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the exploded structure of a battery cell according to an embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure in which the liquid cooling plate of an embodiment of the utility model is arranged at the bottom of the battery cell;

[0021] Figure 4 This is a schematic structural diagram of a liquid cooling plate in an embodiment of the utility model disposed at the front of a battery cell.

[0022] Description of reference numerals:

[0023] 1. Shell; 2. Cover plate; 21. Glue injection hole; 3. Pole core; 31. Pole ear; 311. Flanged edge; 4. Pole column; 41. Conductive block; 5. Thermal conductive glue; 6. Isolation cover; 61. Accommodating cavity; 62. Through hole; 7. Liquid cooling plate. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "matched" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, it should be noted that in the description of the present invention, it should be noted that the terminology nouns in the various embodiments, such as "upper", "lower", "front", "back" and other words indicating directions, are only for simplifying the description of the positional relationship based on the drawings in the specification, and do not mean that the components and devices referred to must be operated in accordance with the specific directions and specified operations and methods and structures in the specification. Such directional nouns do not constitute a limitation on the present invention.

[0027] In this article, an XYZ coordinate system is established, wherein the X-axis represents the front-to-back direction, the positive direction of the X-axis represents the front, and the reverse direction of the X-axis represents the rear; the Y-axis represents the left-to-right direction, the positive direction of the Y-axis represents the left, and the reverse direction of the Y-axis represents the right; the Z-axis represents the up-down direction, the positive direction of the Z-axis represents the top, and the negative direction of the Z-axis represents the bottom. It should be noted that the aforementioned X-axis, Y-axis, and Z-axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] like Figure 1-Figure 2As shown, a battery cell of an embodiment of the utility model includes a shell 1, a cover plate 2, a pole core 3, a pole post 4 and a thermally conductive adhesive 5, wherein the pole core 3 is arranged in the shell 1, and an end of the pole core 3 close to the cover plate 2 is provided with a pole ear 31, one end of the pole post 4 passes through the cover plate 2 to be connected with the pole ear 31, and the gap between the pole core 3 and the cover plate 2 is filled with the thermally conductive adhesive 5, and the thermally conductive adhesive 5 is in contact with the pole post 4 and / or the pole ear 31, and is in contact with the cover plate 2 and / or the shell 1.

[0029] Specifically, the shell 1 is made of aluminum shell and has a rectangular structure. The length direction of the shell 1 is the extension direction of the shell 1, that is, the direction indicated by the Y-axis. The shell 1 is provided with a rectangular opening at one or both ends along the direction indicated by the Y-axis. The projection of the cover plate 2 on the XZ plane is a rectangle. The cover plate 2 is covered at the corresponding opening. The cover plate 2 and the shell 1 are detachably connected by means of snap connection or screw connection, which is convenient for the installation of the pole core 3.

[0030] The pole core 3 is a rectangular parallelepiped extending in the direction indicated by the Y axis, which matches the shape of the shell 1. The pole core 3 includes positive electrode material, negative electrode material, electrolyte and diaphragm. The positive electrode material, diaphragm and negative electrode material are stacked in sequence to form a stacked structure, and then the electrolyte is injected between the positive and negative electrode materials. Finally, the positive and negative electrode materials and the diaphragm are tightly packaged together to form the pole core.

[0031] The cover plate 2 is provided with a mounting hole, through which the pole 4 passes and is welded to the pole ear 31, and the pole 4 is also welded to the cover plate 2. The thermal conductive glue 5 is liquid or semi-solid at the beginning of injection, has good fluidity, and can become solid under high temperature conditions and fill at both ends of the battery cell.

[0032] The thermal conductive adhesive 5 is in contact with the pole 4 and / or the pole ear 31, and is in contact with the cover plate 2 and / or the shell 1, including various situations, such as the thermal conductive adhesive 5 is in contact with the pole 4 and the cover plate 2, or the thermal conductive adhesive 5 is in contact with the pole 4 and the shell 1, or the thermal conductive adhesive 5 is in contact with the pole 4, the pole ear 31, and the cover plate 2, etc., which are not listed one by one. That is, the thermal conductive adhesive 5 can completely fill the gap between the pole core 3 and the cover plate 2, or may not fill the gap between the pole core 3 and the cover plate 2.

[0033] In this embodiment, the pole core 3 realizes the exchange of electric energy with the outside world through the pole ear 31 and the pole column 4 to complete the charging and discharging process. By filling the gap between the end of the pole core 3 along the length direction and the corresponding cover plate 2 with the thermal conductive adhesive 5, the thermal conductive adhesive 5 is in contact with the pole column 4 and / or the pole ear 31, and is in contact with the cover plate 2 and / or the shell 1. During the operation of the battery cell, the heat generated by the pole ear 31 and / or the pole column 4 can be transferred to the shell 1 and / or the cover plate 2 more quickly through the thermal conductive adhesive 5, and even to the external environment, thereby improving the heat dissipation effect of the end of the battery cell along the length direction, and the overall temperature difference of the battery cell is smaller, which is conducive to improving the performance of the battery cell and extending the service life of the battery cell. At the same time, the thermal conductive adhesive 5 has good fluidity and can be better filled at both ends of the pole core, further ensuring the heat dissipation effect.

[0034] In one embodiment, both ends of the housing 1 along the length direction are provided with openings, and the two cover plates 2 are provided on the corresponding openings, and the two ends of the pole core 3 are provided with pole ears 31 respectively, and the pole column 4 is provided in one-to-one correspondence with the pole ears 31, and one end of each pole column 4 passes through the corresponding cover plate 2 to be connected with the pole ear 31, and the gap between the pole core 3 and the corresponding cover plate 2 is filled with the thermal conductive adhesive 5. To achieve heat dissipation of the battery cell with the pole ears 31 provided at both ends.

[0035] like Figure 1-Figure 2 As shown, optionally, the battery cell further includes an isolation cover 6 , which is disposed on a side of the pole core 3 close to the cover plate 2 , and the thermal conductive adhesive 5 is filled between the isolation cover 6 and the cover plate 2 .

[0036] In this embodiment, the isolation cover 6 is made of corrosion-resistant material. During the operation of the battery cell, electrolyte leakage may occur. In order to prevent the electrolyte leakage from corroding the thermal conductive adhesive 5 and affecting the heat dissipation effect, an isolation cover 6 is provided between the two ends of the pole core 3 and the corresponding cover plate 2. The isolation cover 6 is used to isolate the electrolyte to ensure the heat dissipation effect.

[0037] like Figure 2 As shown, optionally, the isolation cover 6 is provided with a receiving cavity 61 opening toward one side of the cover plate 2 , the thermal conductive adhesive 5 is filled in the receiving cavity 61 , and the cover plate 2 is connected to the isolation cover 6 and in contact with the thermal conductive adhesive 5 .

[0038] Specifically, the isolation cover 6 includes a bottom plate and a plurality of side plates, each of which is connected in sequence to form an annular structure, one end of which is connected to the bottom plate to enclose a receiving cavity 61 with an opening toward one side of the cover plate 2, and the circumferential edge of the cover plate 2 can extend toward the side close to the isolation cover 6 to form a connecting portion, which is inserted into the receiving cavity to achieve assembly between the cover plate 2 and the isolation cover 6. The side plates of the isolation cover 6 are in contact with the inner wall of the housing 1.

[0039] In this embodiment, the opening of the isolation cover 6 can not only cooperate with the cover plate 2 to form a sealed accommodating cavity for filling the thermal conductive adhesive 5, but also can be plugged with the cover plate 2 to achieve simple and convenient assembly of the two. The cover plate 2 is in direct contact with the thermal conductive adhesive 5, and the heat absorbed by the thermal conductive adhesive 5 is directly transferred to the external environment through the cover plate 2, which dissipates heat faster.

[0040] In some other embodiments, the isolation cover 6 may be a flat plate arranged parallel to the XZ plane, the upper and lower ends of the flat plate are respectively connected to the shell, and the flat plate, the shell and the partition plate enclose a containing space to contain the thermal conductive adhesive 5.

[0041] like Figure 2-Figure 4 As shown, optionally, a glue injection hole 21 is provided on the cover plate 2 , and the glue injection hole 21 is communicated with the accommodating cavity 61 .

[0042] Specifically, the glue injection hole 21 can be any shape such as a circular hole, a square hole, etc., and one or more glue injection holes 21 can be set. The glue injection hole 21 is blocked by plugging. After the cover plate 2 and the isolation cover 6 are assembled, the blockage is opened and glue is injected into the accommodating cavity 61 through the glue injection hole 21. When glue injection is not needed, the glue injection hole 21 is blocked to prevent impurities and dust from entering.

[0043] In some other embodiments, the heat-conducting adhesive 5 may be first filled into the accommodating cavity of the isolation cover 6 and then the cover plate 2 may be assembled.

[0044] like Figure 2 As shown, optionally, a through hole 62 is provided at the bottom of the accommodating cavity 61 , a conductive block 41 is provided at one end of the pole 4 extending into the cover plate 2 , and the pole ear 31 passes through the through hole 62 to be connected to the conductive block 41 .

[0045] Specifically, the through hole 62 is a long strip hole that matches the shape of the pole ear 31. One end of the pole 4 is located on the inner side of the cover plate 2 to connect with the pole ear 31 in the accommodating cavity 61, and the other end of the pole 4 extends from the mounting hole on the cover plate 2. The pole 4 is riveted and / or welded to the cover plate.

[0046] like Figure 2 As shown, optionally, one end of the pole ear 31 passes through the through hole 62 and is bent to form a flange 311 , and the flange 311 is closely connected to the conductive block 41 .

[0047] Specifically, the pole ear 31 is in the shape of a thin sheet extending along the Y direction, and its cross-sectional size in the XZ plane is relatively small. One end of the pole ear 31 extending out of the through hole 62 is bent to form a flange 311 parallel to the XZ plane. The flange 311 is used to increase the contact area between the pole ear 31 and the conductive block 41, so that the connection stability between the conductive block 41 and the pole ear 31 is better.

[0048] Optionally, the isolation cover 6 is made of a thermally conductive and corrosion-resistant material.

[0049] Here, the isolation cover 6 is corrosion-resistant on the one hand, which can ensure that it will not be corroded by the leaked electrolyte, thereby protecting the thermal conductive adhesive 5 therein; on the other hand, it is thermally conductive, and the heat absorbed by the thermal conductive adhesive 5 can be transferred to the shell 1 through the isolation cover 6, thereby ensuring the heat dissipation performance of the battery cell end.

[0050] Another embodiment of the present invention provides a battery pack, comprising the above-mentioned battery cell. The advantages of the battery pack compared with the prior art are the same as those of the above-mentioned battery cell, and will not be described again.

[0051] like Figure 3-Figure 4 As shown, optionally, the battery pack further includes a liquid cooling plate 7, wherein the liquid cooling plate 7 contacts one side of the shell 1, and the thermal conductive adhesive 5 is arranged close to the side of the shell 1 contacting the liquid cooling plate 7.

[0052] Specifically, the liquid cooling plate 7 is a rectangular plate-shaped structure, the battery cells are arranged in the direction shown in the figure, the battery cells extend in the direction shown by the Y axis, the front and rear surfaces of the battery cells are parallel to the YZ plane, and the top and bottom surfaces of the battery cells are parallel to the XY plane. When one liquid cooling plate 7 is provided, the liquid cooling plate 7 can be in contact with any one of the front, rear, top and bottom surfaces of the shell 1 of the battery cell, wherein, Figure 3 Schematic diagram of the installation of the liquid cooling plate 7 and the bottom surface of the housing 1. The installation method of the liquid cooling plate 7 on the top surface of the housing 1 is the same as that of the liquid cooling plate on the bottom surface. Figure 4 It is a schematic diagram of the installation of the liquid cooling plate 7 and the front of the housing 1. The installation method of the liquid cooling plate 7 on the rear of the housing 1 is the same as the installation method of the liquid cooling plate 7 on the bottom.

[0053] Taking the fitting of the liquid cooling plate 7 and the bottom surface of the shell 1 as an example, the thermal conductive adhesive 5 is arranged close to the side of the shell 1 in contact with the liquid cooling plate 7, that is, the gap between the end of the pole core 3 and the cover plate 2 may not be completely filled with the thermal conductive adhesive 5. Specifically, the thermal conductive adhesive 5 is filled between the end of the pole core 3 and the end of the cover plate 2 along the negative direction of the Z axis, and the gap between the pole core 3 and the end of the cover plate 2 along the positive direction of the Z axis is not filled. While utilizing the thermal conductive adhesive 5 to transfer heat through the shell 1 and the cover plate 2 to the liquid cooling plate 7 below, rapid heat dissipation is achieved, and the use of the thermal conductive adhesive 5 can be saved, thereby reducing costs.

[0054] Of course, in some other embodiments, a plurality of battery cells and a plurality of liquid cooling plates 7 may be provided in the battery pack, the battery cells are arranged in sequence, the liquid cooling plates 7 and the battery cells are arranged alternately, and two of the sides of the shell 1 of some battery cells parallel to the XY plane or the YZ plane may be respectively in contact with two liquid cooling plates 7. The specific number of liquid cooling plates can be determined according to the cooling needs of the battery cells, and the liquid cooling plates 7 can be set at appropriate positions. When multiple surfaces of the battery cells are in contact with the liquid cooling plates 7, the gap between the end of the pole core 3 and the cover plate 2 can be completely filled with the thermal conductive adhesive 5, ensuring that the thermal conductive adhesive 5 quickly transfers the heat at the end of the battery cell to each liquid cooling plate 7 through the shell 1 and the cover plate 2, thereby improving the heat dissipation effect of the battery cell.

[0055] Yet another embodiment of the present invention provides a vehicle, comprising the above-mentioned battery pack.

[0056] The vehicle described in the utility model fills the gaps between the two ends of the pole core of the battery cell of the battery pack and the shell and the cover plate with thermal conductive adhesive 5. When the battery cell is in operation, the heat generated by the pole ears and poles at both ends can be transferred to the shell, the cover plate and even the external environment more quickly through the thermal conductive adhesive 5, thereby improving the heat dissipation effect at both ends of the battery cell. The overall temperature difference of the battery cell is smaller, which is beneficial to improving the performance of the battery cell and the battery pack and extending the service life of the battery cell and the battery pack.

[0057] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A battery cell, characterized in that: The invention comprises a shell (1), a cover plate (2), a pole core (3), a pole column (4) and a heat-conducting adhesive (5); the pole core (3) is arranged in the shell (1); an end of the pole core (3) close to the cover plate (2) is provided with a pole ear (31); one end of the pole column (4) passes through the cover plate (2) to be connected to the pole ear (31); a gap between the pole core (3) and the cover plate (2) is filled with the heat-conducting adhesive (5); the heat-conducting adhesive (5) is in contact with the pole column (4) and / or the pole ear (31), and is in contact with the cover plate (2) and / or the shell (1).

2. The battery cell according to claim 1, characterized in that: It also comprises an isolation cover (6), wherein the isolation cover (6) is arranged on a side of the pole core (3) close to the cover plate (2), and the thermal conductive adhesive (5) is filled between the isolation cover (6) and the cover plate (2).

3. The battery cell according to claim 2, characterized in that: The isolation cover (6) is provided with a receiving cavity (61) with an opening toward one side of the cover plate (2), the heat conductive adhesive (5) is filled in the receiving cavity (61), and the cover plate (2) is connected to the isolation cover (6) and in contact with the heat conductive adhesive (5).

4. The battery cell according to claim 3, characterized in that: The cover plate (2) is provided with a glue injection hole (21), and the glue injection hole (21) is communicated with the accommodating cavity (61).

5. The battery cell according to claim 3, characterized in that: A through hole (62) is provided at the bottom of the accommodating cavity (61); a conductive block (41) is provided at one end of the pole (4) extending into the cover plate (2); and the pole ear (31) passes through the through hole (62) to be connected to the conductive block (41).

6. The battery cell according to claim 5, characterized in that: One end of the pole ear (31) passes through the through hole (62) and is then bent to form a flange (311), and the flange (311) is fitted and connected to the conductive block (41).

7. The battery cell according to claim 1, characterized in that: The shell (1) is provided with openings at both ends along the length direction, and the two cover plates (2) are respectively covered on the corresponding openings.

8. A battery pack, characterized in that: Comprising the battery cell as described in any one of claims 1 to 7.

9. The battery pack according to claim 8, characterized in that: It also includes a liquid cooling plate (7), the liquid cooling plate (7) is in contact with one side of the shell (1) of the battery cell, and the thermal conductive glue (5) is arranged close to the side of the shell (1) in contact with the liquid cooling plate (7).

10. A vehicle, characterized in that: Comprising a battery pack as described in any one of claims 8-9.

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