Battery cell, battery pack, and vehicle

Abstract

The present application discloses a battery cell, a battery pack, and a vehicle. The battery cell comprises a casing, cover plates, an electrode core, poles, and thermally conductive adhesives; the electrode core is arranged in the casing; the ends of the electrode core close to the cover plates are each provided with a tab; one end of each pole passes through the corresponding cover plate to be connected to the corresponding tab; a gap between the electrode core and each cover plate is filled with a thermally conductive adhesive; the thermally conductive adhesive makes contact with the corresponding pole and / or tab and makes contact with the corresponding cover plate and / or the casing.

Description

Battery cell, battery pack and vehicle

[0001] The present application claims priority to the Chinese patent application No. 2024207301850, filed on April 10, 2024, and entitled "Battery cell, battery pack and vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] Embodiments of the present application relate to, but are not limited to, the technical field of automobile battery, in particular, to a battery cell, a battery pack and a vehicle. BACKGROUND

[0003] With the increasing requirement of users on the charging time of the whole vehicle, the charging rate is also increasing, even reaching 5C, which causes the battery cell to face the problem of excessively high temperature during charging. The battery cell is provided with a tab at one end or both ends along the length direction. According to the actual measurement data, the highest temperature of the end part along the length direction of the battery cell, i.e. the tab, during charging has exceeded 70℃, and the temperature difference with other positions inside the battery cell is close to 20℃, which is extremely uneven in temperature distribution, seriously affecting the performance and service life of the battery cell. SUMMARY

[0004] The following is a summary of the subject matter of the detailed description herein. This summary is not intended to limit the scope of the claims.

[0005] Embodiments of the present application disclose a battery cell, comprising a shell, a cover plate, a pole core, a pole and a heat-conducting glue. The pole core is arranged in the shell, and an end of the pole core close to the cover plate is provided with a tab. One end of the pole passes through the cover plate to be connected with the tab. The gap between the pole core and the cover plate is filled with the heat-conducting glue. The heat-conducting glue is in contact with the pole and / or the tab, and in contact with the cover plate and / or the shell.

[0006] Optionally, the battery cell further comprises a shielding cover arranged on the side of the pole core close to the cover plate. The heat-conducting glue is filled between the shielding cover and the cover plate.

[0007] Optionally, the shielding cover is provided with a receiving cavity with an opening facing the side of the cover plate. The heat-conducting glue is filled in the receiving cavity. The cover plate is connected with the shielding cover and in contact with the heat-conducting glue.

[0008] Optionally, the cover plate is provided with a glue injection hole in communication with the receiving cavity.

[0009] Optionally, the bottom of the receiving cavity is provided with a through hole. One end of the pole inserted into the cover plate is provided with a conductive block. The tab passes through the through hole to be connected with the conductive block.

[0010] Optionally, one end of the tab passes through the through hole and is then bent to form a flange, and the flange is fitted and connected to the conductive block.

[0011] Optionally, the shell is provided with openings at both ends along the length direction, and the two cover plates are respectively covered on the corresponding openings.

[0012] The battery cell of the embodiment of the present invention has the following beneficial effects: by filling the gap between the pole core and the cover plate with thermally conductive adhesive, the thermally conductive adhesive can fill the entire gap between the pole core and the cover plate, or it can not fill the entire gap, that is, the thermally 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 can be transferred to the shell and / or the cover plate more quickly through the thermally conductive adhesive, and even to the external environment, thereby improving the heat dissipation effect of the end of the battery cell along the length direction. 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 thermally conductive adhesive has good fluidity and can be better filled at the end of the pole core, further ensuring the heat dissipation effect.

[0013] An embodiment of the present invention further discloses a battery pack, comprising the above-mentioned battery cell.

[0014] The battery cell of the embodiment of the present invention has the following beneficial effects: by filling the gaps between the two ends of the battery core and the shell and 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, cover plate and even the external environment more quickly through the thermal 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.

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

[0016] An embodiment of the present invention further discloses a vehicle including the above-mentioned battery pack.

[0017] The vehicle of the embodiment of the present invention has the following beneficial effects: by filling the gaps between the two ends of the battery core of the battery pack and the shell and cover plate, the heat generated by the pole ears and poles at both ends of the battery cell during operation can be transferred to the shell, cover plate and even the external environment more quickly through the thermal 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.

[0018] Still other aspects will become apparent upon reading and understanding the detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Fig. 1 is a structural diagram of an electric core according to an embodiment of the present application;

[0020] Fig. 2 is an exploded structural diagram of an electric core according to an embodiment of the present application;

[0021] Fig. 3 is a structural diagram of a liquid cooling plate arranged at the bottom of an electric core according to an embodiment of the present application;

[0022] Fig. 4 is a structural diagram of a liquid cooling plate arranged at the front of an electric core according to an embodiment of the present application.

[0023] Reference signs: 1, housing; 2, cover plate; 21, glue injection hole; 3, pole core; 31, tab; 311, flange; 4, pole column; 41, conductive block; 5, heat-conducting glue; 6, isolation cover; 61, accommodating cavity; 62, through hole; 7, liquid cooling plate. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0025] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fitting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be the communication inside two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the embodiments of the present application can be understood according to the specific circumstances.

[0026] In addition, it should be noted that in the description of the embodiments of the present application, it should be noted that the terms such as "upper", "lower", "front", "rear" and other words indicating the position in each embodiment only indicate the positional relationship based on the drawings of the specification, and do not represent that the elements and devices referred to must be operated according to the specific position and limited operation and method, structure in the specification, and such positional terms do not constitute a limitation on the embodiments of the present application.

[0027] In this paper, an XYZ coordinate system is established, wherein the X axis represents the front-back direction, the positive direction of the X axis represents the front direction, the negative direction of the X axis represents the rear direction, the Y axis represents the left-right direction, the positive direction of the Y axis represents the left direction, the negative direction of the Y axis represents the right direction, the Z axis represents the up-down direction, the positive direction of the Z axis represents the up direction, and the negative direction of the Z axis represents the down direction. And it should be noted that the aforementioned X axis, Y axis and Z axis represent the meaning only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0028] As shown in FIG. 1-2, an electric cell of an embodiment of the present application includes a shell 1, a cover plate 2, a pole core 3, a pole post 4 and a heat-conducting glue 5, the pole core 3 is arranged in the shell 1, the pole core 3 is provided with a pole tab 31 at an end close to the cover plate 2, one end of the pole post 4 penetrates through the cover plate 2 to be connected with the pole tab 31, the gap between the pole core 3 and the cover plate 2 is filled with the heat-conducting glue 5, the heat-conducting glue 5 is in contact with the pole post 4 and / or the pole tab 31, and in contact with the cover plate 2 and / or the shell 1.

[0029] Specifically, the shell 1 adopts an aluminum shell and is in a cuboid structure, the length direction of the shell 1 is the extending direction of the shell 1, i.e. the direction shown by the Y axis, one end or both ends of the shell 1 along the direction shown by the Y axis is provided with a rectangular opening, the projection of the cover plate 2 on the XZ plane is a rectangle, the cover plate 2 is arranged on the corresponding opening, and the cover plate 2 is detachably connected with the shell 1 by clamping or screwing or the like, facilitating the installation of the pole core 3.

[0030] The pole core 3 is a cuboid extending along the direction shown by the Y axis and is matched with the shape of the shell 1, the pole core 3 includes positive electrode material, negative electrode material, electrolyte and a separator, the positive electrode material, the separator and the negative electrode material are sequentially stacked to form a laminated structure, then the electrolyte is injected between the positive and negative electrode materials, and finally the positive and negative electrode materials and the separator are tightly packaged together to form the pole core.

[0031] The cover plate 2 is provided with a mounting hole, the pole post 4 penetrates through the mounting hole and is welded and fixed with the pole tab 31, and the pole post 4 is also welded and fixed with the cover plate 2. The heat-conducting glue 5 is liquid or semi-solid at the beginning of injection and has good fluidity, and can become solid under high temperature conditions to fill in both ends of the electric cell.

[0032] The heat-conducting glue 5 is in contact with the pole post 4 and / or the pole tab 31, and in contact with the cover plate 2 and / or the shell 1, including various cases, such as the heat-conducting glue 5 being in contact with the pole post 4 and the cover plate 2, or the heat-conducting glue 5 being in contact with the pole post 4 and the shell 1, or the heat-conducting glue 5 being in contact with the pole post 4, the pole tab 31 and the cover plate 2, and the like, which will not be listed one by one, i.e. the heat-conducting glue 5 can completely fill the gap between the pole core 3 and the cover plate 2, or can not fill the gap between the pole core 3 and the cover plate 2.

[0033] In the embodiment, the pole core 3 exchanges electric energy with the outside through the pole lug 31 and the pole column 4 to complete the charging and discharging process. By filling the heat-conducting glue 5 in the gap between the end of the pole core 3 along the length direction and the corresponding cover plate 2, the heat-conducting glue 5 is in contact with the pole column 4 and / or the pole lug 31 and in contact with the cover plate 2 and / or the shell 1. In the working process of the battery cell, the heat generated by the pole lug 31 and / or the pole column 4 can be more quickly transferred to the shell 1 and / or the cover plate 2 through the heat-conducting glue 5 until the external environment, 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 prolonging the service life of the battery cell. At the same time, the heat-conducting glue 5 has good flowability and can better fill the two ends of the pole core, further ensuring the heat dissipation effect.

[0034] In an embodiment, the shell 1 is provided with an opening at both ends along the length direction, and the two cover plates 2 are arranged at the corresponding openings. The pole core 3 is provided with a pole lug 31 at each end, and the pole column 4 is arranged in one-to-one correspondence with the pole lug 31. One end of each pole column 4 penetrates through the corresponding cover plate 2 to be connected with the pole lug 31. The gap between the pole core 3 and the corresponding cover plate 2 is filled with the heat-conducting glue 5. The heat dissipation of the battery cell with the pole lug 31 arranged at both ends is realized.

[0035] As shown in FIGS. 1-2, optionally, the battery cell further comprises a isolation cover 6 arranged on the side of the pole core 3 close to the cover plate 2. The heat-conducting glue 5 is filled between the isolation cover 6 and the cover plate 2.

[0036] In the embodiment, the isolation cover 6 is made of a corrosion-resistant material. In the working process of the battery cell, there may be a problem of electrolyte leakage. In order to avoid the electrolyte leakage from corroding the heat-conducting glue 5 and affecting the heat dissipation effect, the isolation cover 6 is arranged between the two ends of the pole core 3 and the corresponding cover plate 2 to isolate the electrolyte by using the isolation cover 6, so as to ensure the heat dissipation effect.

[0037] As shown in FIG. 2, optionally, the isolation cover 6 is provided with a containing cavity 61 with an opening facing the side of the cover plate 2. The heat-conducting glue 5 is filled in the containing cavity 61. The cover plate 2 is connected with the isolation cover 6 and in contact with the heat-conducting glue 5.

[0038] Specifically, the isolation cover 6 comprises a bottom plate and a plurality of side plates. Each side plate is sequentially connected to form an annular structure. One end of the annular structure is connected with the bottom plate to form a containing cavity 61 with an opening facing the side of the cover plate 2. The circumferential edge of the cover plate 2 can extend towards the side close to the isolation cover 6 to form a connecting part which is inserted into the containing cavity to realize the assembly between the cover plate 2 and the isolation cover 6. The side plate of the isolation cover 6 is in contact with the inner wall of the shell 1.

[0039] In the embodiment, the opening of the isolation cover 6 can not only cooperate with the cover plate 2 to form a sealed containing cavity for filling the heat-conducting glue 5, but also can realize the plug-in cooperation with the cover plate 2, so as to realize the simple and convenient assembly of the two. The cover plate 2 is directly in contact with the heat-conducting glue 5, and the heat absorbed by the heat-conducting glue 5 is directly transmitted to the external environment through the cover plate 2, so that the heat dissipation is faster.

[0040] In some other embodiments, the isolation cover 6 can be a flat plate arranged in parallel with the XZ plane, and the upper and lower ends of the flat plate are connected with the shell, respectively. The flat plate, the shell and the partition plate enclose a containing space to contain the heat-conducting glue 5.

[0041] As shown in FIGS. 2-4, optionally, the cover plate 2 is provided with a glue injection hole 21, which is in communication with the containing cavity 61.

[0042] Specifically, the glue injection hole 21 can be a circular hole, a square hole or any other shape. One or more glue injection holes 21 can be provided. The glue injection hole 21 is plugged by plugging. After the cover plate 2 is assembled with the isolation cover 6, the plugging is opened, the glue is injected into the containing cavity 61 through the glue injection hole 21, and when the glue is not needed, the glue injection hole 21 is plugged to prevent impurities and dust from entering.

[0043] In some other embodiments, the heat-conducting glue 5 can be filled in the containing cavity of the isolation cover 6 first, and then the cover plate 2 is assembled.

[0044] As shown in FIG. 2, optionally, the bottom of the containing cavity 61 is provided with a through hole 62, one end of the pole 4 extending into the cover plate 2 is provided with a conductive block 41, and the tab 31 passes through the through hole 62 to be connected with the conductive block 41.

[0045] Specifically, the through hole 62 and the tab 31 are matched in shape and are long strip-shaped holes. One end of the pole 4 is located on the inner side of the cover plate 2 to be connected with the tab 31 in the containing cavity 61, and the other end of the pole 4 extends out of the mounting hole on the cover plate 2, and the pole 4 is press riveted and / or welded with the cover plate.

[0046] As shown in FIG. 2, optionally, one end of the tab 31 is bent to form a flange 311 after passing through the through hole 62, and the flange 311 is connected with the conductive block 41.

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

[0048] Optionally, the isolation cover 6 is made of a material having heat conductivity and corrosion resistance.

[0049] Here, the isolation cover 6 has corrosion resistance on one hand, which can ensure that it will not be corroded by the leaked electrolyte, and plays a protective role for the heat-conducting glue 5 inside; on the other hand, it has heat conductivity, so that the heat absorbed by the heat-conducting glue 5 can be transmitted to the shell 1 through the isolation cover 6, ensuring the heat dissipation performance of the end of the battery cell.

[0050] Another embodiment of the present application provides a battery pack comprising the battery cell described above. The battery pack has the same advantages as the battery cell described above, which will not be repeated.

[0051] As shown in FIGS. 3-4, optionally, the battery pack further comprises a liquid cooling plate 7, which is in contact with one side of the shell 1, and the heat-conducting glue 5 is arranged close to the side of the shell 1 in contact with the liquid cooling plate 7.

[0052] Specifically, the liquid cooling plate 7 is a cuboid plate structure, and the battery cell is arranged in the direction as shown in the figure, the battery cell extends along the Y-axis direction, the front and back surfaces of the battery cell are parallel to the YZ plane, and the top and bottom surfaces of the battery cell are parallel to the XY plane. When one liquid cooling plate 7 is arranged, the liquid cooling plate 7 can be in contact with any one of the front, back, top and bottom surfaces of the shell 1 of the battery cell, wherein FIG. 3 is a schematic diagram of the installation of the liquid cooling plate 7 and the bottom surface of the shell 1, the assembly of the liquid cooling plate 7 on the top surface of the shell 1 is the same as the installation of the liquid cooling plate on the bottom surface, and FIG. 4 is a schematic diagram of the installation of the liquid cooling plate 7 and the front surface of the shell 1, the assembly of the liquid cooling plate 7 on the back surface of the shell 1 is the same as the installation of the liquid cooling plate 7 on the bottom surface.

[0053] Taking the example of the liquid cooling plate 7 being in contact with the bottom surface of the shell 1, the heat-conducting glue 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 can not be completely filled with the heat-conducting glue 5. Specifically, the heat-conducting glue 5 is filled between the end of the pole core 3 and the one end of the cover plate 2 along the negative direction of the Z-axis, and not filled between the pole core 3 and the one end of the cover plate 2 along the positive direction of the Z-axis. By using the heat-conducting glue 5 to transmit the heat to the liquid cooling plate 7 below through the shell 1 and the cover plate 2, the heat can be quickly dissipated, and the use amount of the heat-conducting glue 5 can be saved, and the cost can be reduced.

[0054] Of course, in some other embodiments, a plurality of battery cells and a plurality of liquid cooling plates 7 can be arranged in the battery pack, the battery cells are arranged in sequence, and the liquid cooling plates 7 are arranged alternately with the battery cells. Two liquid cooling plates 7 can be in contact with two of the sides of the shell 1 of the battery cell which are parallel to the XY plane or the YZ plane, respectively. The specific number of liquid cooling plates can be arranged at appropriate positions according to the cooling needs of the battery cell. When the plurality of surfaces of the battery cell 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 heat-conducting glue 5, so that the heat-conducting glue 5 can quickly transmit the heat at the end of the battery cell to each liquid cooling plate 7 through the shell 1 and the cover plate 2, and the heat dissipation effect of the battery cell can be improved.

[0055] A vehicle is provided in another embodiment of the present application, which comprises the battery pack.

[0056] The vehicle in the embodiment of the present application can improve the heat dissipation effect of the two ends of the battery cell, and the overall temperature difference of the battery cell is smaller, which is beneficial to improve the performance of the battery cell and the battery pack, and prolong the service life of the battery cell and the battery pack.

[0057] Although the embodiments of the present application are disclosed as above, the protection scope of the embodiments of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application, and these changes and modifications shall fall within the protection scope of the embodiments of the present application.

Claims

1. A battery cell, comprising 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 a pole ear (31) is provided at the end of the pole core (3) close to the cover plate (2), one end of the pole post (4) passes through the cover plate (2) to be connected to 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).

2. The battery cell according to claim 1 further 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 glue (5) is filled between the isolation cover (6) and the cover plate (2).

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

4. The battery cell according to claim 3, wherein: 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, wherein: 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 lug (31) passes through the through hole (62) to be connected to the conductive block (41).

6. The battery cell according to claim 5, wherein: One end of the tab (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, wherein: The shell (1) is provided with openings at both ends along the length direction, and the two cover plates (2) are respectively provided to cover the corresponding openings.

8. A battery pack comprising the battery cell according to any one of claims 1 to 7.

9. The battery pack according to claim 8, further comprising a liquid cooling plate (7), wherein the liquid cooling plate (7) contacts one side of the shell (1) of the battery cell, and the thermal conductive adhesive (5) is arranged close to the side of the shell (1) in contact with the liquid cooling plate (7).

10. A vehicle comprising the battery pack according to any one of claims 8 to 9.

Images