Square battery cell shell and heat conduction method

Abstract

The invention relates to the technical field of battery structures, in particular to a square battery cell shell and a heat conduction method. The square battery cell shell comprises a side shell, a bottom sealing cover and an end cover, the bottom sealing cover is installed at one end of the side shell. The end cover is installed at the other end of the side shell. And the side shell, the bottom sealing cover and the end cover are encircled to form a placing cavity for arranging a roll core. Partition plates are arranged in the containing cavities. The containing cavity is divided by the partition plates to form a plurality of containing units used for containing the roll cores. The partition plate is connected with the inner side of the bottom sealing cover. Slotted holes are formed in the partition plates. The groove holes extend in the direction from the bottom sealing cover to the end cover. The groove holes are distributed in the partition plate in a linear array mode. According to the square battery cell shell, the partition plates are used for conducting heat, heat exchange is formed between the roll cores and the partition plates in the containing cavities, an existing battery shell is optimized, the heat conduction capacity of the shell is improved, and then the service life of a battery is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of battery structures, and in particular to a square battery cell shell and a heat conduction method. Background Art

[0002] The square cell shell, also known as the square battery shell, is a shell structure used to encapsulate square batteries (such as lithium-ion batteries, nickel-metal hydride batteries, etc.). The shell is designed to increase the energy density of the battery, which is conducive to the close arrangement of square batteries inside the shell, thereby improving space utilization.

[0003] For example, Chinese patent document CN219419221U discloses a square battery housing that is convenient for installing battery cells. The square battery housing includes a lower housing, two top cover sheets and an upper cover. The lower housing is in a rectangular strip shape, and has a cavity for placing the battery cells. It is only necessary to first perform soft connection welding between the battery cells and the top cover sheet, and then install the top cover sheet at the end of the lower housing, and seal the end opening, and then perform welding to achieve a sealing effect, and finally install the upper cover to achieve overall sealing.

[0004] However, in actual use, due to the close arrangement of multiple square batteries in the shell, the existing square battery shell has thermal management problems and internal mechanical stress problems. Among them, the thermal management problem is specifically: the heat dissipation performance of square batteries is not as good as that of cylindrical batteries. Especially during high current discharge or fast charging, the temperature distribution inside the battery shell is uneven, which can easily lead to local overheating problems, and the accumulated heat is difficult to quickly transfer to the outside through the side wall of the shell, thereby affecting the battery use effect. The problem of internal mechanical stress is specifically: the battery in the shell will change in volume during the charging and discharging process, and the side walls of adjacent batteries fit together. When expansion occurs, it is easy to cause mutual squeezing between the batteries. Repeated use may even cause deformation or damage to the shell, greatly affecting the service life of the battery. Summary of the invention

[0005] The purpose of the present invention is to provide a shell structure for square batteries during use, so as to optimize the existing square battery shell, improve the thermal conductivity of the shell, and thus extend the service life of the battery.

[0006] To achieve the above object, the present invention provides a square battery cell housing, comprising a side shell, a bottom cover and an end cover, wherein the bottom cover is mounted at one end of the side shell, and the end cover is mounted at the other end of the side shell, and the side shell, the bottom cover and the end cover together form a placement cavity for arranging a winding core; A partition is provided in the placement cavity, and the partition divides the placement cavity to form a plurality of placement units for accommodating the core. The partition is connected to the inner side of the bottom cover, and slots are provided on the partition. The slots extend from the bottom cover toward the end cover, and the slots are arranged in a linear array on the partition.

[0007] Among them, the partition is located in a channel formed in a pair of cores, and the partition is used to fit the side wall of the core. On the one hand, the partition plays a role in heat conduction, and the core and the partition form heat exchange in the placement cavity. For example, the partition is convenient for quickly conducting the heat generated by the core during charging and discharging from the bottom cover, and the partition is also convenient for conducting the heat used to heat the core from the cover into the placement cavity; on the other hand, the partition plays an auxiliary supporting role for the core, which is conducive to limiting the volume expansion of the core and alleviating the mechanical stress problem generated inside the shell.

[0008] Preferably, a plurality of partitions are arranged in the placement cavity, and the plurality of partitions are arranged at equal intervals along the arrangement direction of the winding core. Such an arrangement is convenient for meeting different winding core arrangement requirements and is conducive to improving the adaptability of the square battery cell housing.

[0009] Preferably, a guide groove is provided on the inner wall of the side shell, and the side edge of the partition is embedded in the guide groove. With such a configuration, the guide groove, on the one hand, guides the partition when the partition is embedded in the placement cavity, which is conducive to improving the assembly position accuracy of the partition; on the other hand, the side wall of the guide groove supports the partition, which is used to further improve the supporting strength of the partition on the winding core, thereby improving the supporting performance of the partition.

[0010] Preferably, a first polarity terminal and a second polarity terminal are provided on the end cover, the first polarity terminal is connected to the positive pole of the winding core, and the second polarity terminal is connected to the negative pole of the winding core.

[0011] Preferably, the length of the partition is shorter than that of the side shell. This arrangement is conducive to avoiding contact between the partition and the end cover, and ensures that there is sufficient assembly space between the end cover and the end of the winding core.

[0012] Preferably, the bottom cover and the side shell are sealed by welding, and the end cover and the side shell are sealed by welding. Such an arrangement is conducive to improving the sealing of the square battery cell shell, avoiding leakage of electrolyte, and effectively preventing external gas from entering, further ensuring the stability of the working environment of the winding core.

[0013] Preferably, the slot is a rectangular through hole. In this way, the rectangular through hole is convenient for stamping on the partition, reducing the manufacturing cost, and is conducive to further reducing the dead weight of the partition while ensuring the supporting strength of the partition.

[0014] Another aspect of the present invention provides a heat conduction method using the square battery cell housing, comprising the following steps: The partition is located in a channel formed in a pair of winding cores. The partition is used to fit the side wall of the winding core. The partition plays a role in heat conduction. The winding core and the partition form heat exchange in the placement cavity. When the core is charged and discharged, the separator quickly conducts the heat generated by the core from the bottom cover; When the winding core is heated, the partition introduces the heat for heating the winding core into the placement cavity from the bottom cover.

[0015] Compared with the prior art, a square battery cell shell and heat conduction method provided by the present invention have the following outstanding substantial features and significant progress: the square battery cell shell optimizes the existing shell structure, a partition is arranged in the placement cavity, the partition is placed between the cores, and the partition is fitted with the side wall of the core to increase the heat conduction between the core and the shell during the charging and discharging process of the core. On the one hand, it is convenient to quickly conduct the heat generated by the core during charging and discharging from the bottom cover, and on the other hand, it is also convenient to conduct the heat used to heat the core from the cover into the placement cavity. In addition, the partition plays an auxiliary supporting role for the core, which is beneficial to limit the volume expansion of the core and alleviate the mechanical stress problem generated inside the shell. It can also be used to prevent the internal collapse of the battery cell, play a supporting role, and further extend the service life of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of a square battery cell shell in an embodiment of the present invention.

[0017] Figure 2 yes Figure 1 A schematic diagram of the assembly structure of a square battery cell shell.

[0018] Figure 3 It is a schematic diagram of the internal structure of a square battery cell shell in an embodiment of the present invention.

[0019] Figure 4 It is a schematic diagram of the internal structure of another square battery cell shell in an embodiment of the present invention.

[0020] Figure 5 yes Figure 4 Schematic diagram of the local enlarged structure at point A in the middle.

[0021] Figure numerals: 1, side shell; 2, bottom cover; 3, end cover; 4, placement cavity; 5, winding core; 6, partition; 7, slot; 8, guide groove; 9, first polarity terminal; 10, second polarity terminal. DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] like Figure 1-Figure 5 As shown, a square battery cell shell is proposed in an embodiment of the present invention, aiming to optimize the existing square battery shell, improve the thermal conductivity of the shell, and thus extend the service life of the battery.

[0024] A square battery cell shell proposed in an embodiment of the present invention arranges a partition 6 in the placement cavity 4, places the partition 6 between the core 5, and utilizes the partition 6 to fit the side wall of the core 5. During the charging and discharging process of the core 5, the heat conduction between the core 5 and the shell is increased. On the one hand, it is convenient to quickly conduct the heat generated by the core 5 during charging and discharging from the bottom cover 2; on the other hand, it is also convenient to introduce the heat used to heat the core 5 from the cover into the placement cavity 4. In addition, the square battery cell shell uses the partition 6 to play an auxiliary supporting role for the core 5, which is conducive to limiting the volume expansion of the core 5, alleviating the mechanical stress problem generated inside the shell, and can also be used to prevent the internal collapse of the battery cell, play a supporting role, and further extend the service life of the battery cell.

[0025] like Figure 1 Combination Figure 2 As shown, a square battery cell housing includes a side housing 1, a bottom cover 2 and an end cover 3. The bottom cover 2 is installed at one end of the side housing 1. The end cover 3 is installed at the other end of the side housing 1. The side housing 1, the bottom cover 2 and the end cover 3 together form a placement cavity 4 for arranging the winding core 5. Figure 3 As shown, a partition 6 is provided in the placement cavity 4. The partition 6 divides the placement cavity 4 to form a plurality of placement units for accommodating the winding core 5. The partition 6 is connected to the inner side of the bottom cover 2. A slot 7 is provided on the partition 6. The slot 7 extends from the bottom cover 2 toward the end cover 3. The slots 7 are arranged in a linear array on the partition 6. The slots 7 are conducive to improving the effect of heat transfer between the partition 6 and the winding core 5. The surface of the partition 6 is coated with an insulating film.

[0026] For example, the slot 7 is a rectangular through hole. In this way, the rectangular through hole is convenient for forming on the partition 6 by stamping, which reduces the manufacturing cost; on the other hand, it is beneficial to further reduce the dead weight of the partition 6 while ensuring the supporting strength of the partition 6. Figure 2 As shown, a plurality of slots 7 are arranged linearly on the partition 6. The number of slots 7 can be selected appropriately according to the size of the partition 6. The number of slots 7 is preferably 5-8.

[0027] The bottom cover 2 and the side shell 1 are sealed by welding. The end cover 3 and the side shell 1 are sealed by welding. Such a configuration is conducive to improving the sealing of the square battery cell shell, avoiding the leakage of electrolyte, and effectively preventing the entry of external gas, further ensuring the stability of the working environment of the winding core 5.

[0028] like Figure 2 As shown, a first polarity terminal 9 and a second polarity terminal 10 are provided on the end cap 3. The first polarity terminal 9 is connected to the positive pole of the winding core 5, and the second polarity terminal 10 is connected to the negative pole of the winding core 5. In this way, it is helpful to reduce the overall assembly difficulty of the square battery cell shell.

[0029] In order to avoid interference between the partition 6 and the end cover 3, the length of the partition 6 is shorter than the length of the side shell 1. This arrangement is conducive to avoiding contact between the partition 6 and the end cover 3, ensuring that there is enough assembly space between the end cover 3 and the end of the winding core 5.

[0030] In order to further improve the adaptability of the square battery cell shell, a multi-layer partition 6 is arranged in the placement cavity 4, and the multi-layer partition 6 is arranged at equal intervals along the arrangement direction of the winding core 5. Such an arrangement is convenient for meeting different winding core 5 arrangement requirements and is conducive to improving the adaptability of the square battery cell shell. For example, Figure 4 As shown, three layers of partitions 6 are arranged at equal intervals in the placement cavity 4 to form four placement units for accommodating the winding core 5. The number of layers of the partitions 6 can be selected appropriately according to actual needs.

[0031] like Figure 5 As shown, a guide groove 8 is provided on the inner wall of the side shell 1. The side edge of the partition 6 is embedded in the guide groove 8. In this way, the guide groove 8, on the one hand, guides the partition 6 when the partition 6 is embedded in the placement cavity 4, which is conducive to improving the assembly position accuracy of the partition 6; on the other hand, the side wall of the guide groove 8 supports the partition 6, which is used to further improve the supporting strength of the partition 6 on the winding core 5, and improves the supporting performance of the partition 6.

[0032] When a square battery cell shell proposed in an embodiment of the present invention is used, the core 5 is placed in a placement unit formed by a plurality of partitions 6, and the partitions 6 are in contact with the side walls of the core 5. For example, when the core 5 is charged and discharged, the partition 6 can quickly conduct the heat generated by the core 5 during charging and discharging from the bottom cover 2. In addition, when the core 5 is used in a low-temperature environment, the partition 6 also facilitates the introduction of heat used to heat the core 5 from the cover into the placement cavity 4, which is beneficial for the core 5 to be at a suitable use temperature. In addition, the partition 6 plays an auxiliary supporting role for the core 5, which is beneficial for limiting the volume expansion of the core 5, alleviating the problem of mechanical stress generated inside the shell, and further beneficial for extending the service life of the core 5.

[0033] The present invention is not limited to the specific technical solutions described in the above embodiments. In addition to the above embodiments, the present invention may also have other implementation modes. For those skilled in the art, any technical solutions formed by any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A square battery cell shell, characterized in that: The invention comprises a side shell (1), a bottom cover (2) and an end cover (3), wherein the bottom cover (2) is mounted on one end of the side shell (1), and the end cover (3) is mounted on the other end of the side shell (1); the side shell (1), the bottom cover (2) and the end cover (3) together form a placement cavity (4) for arranging a winding core (5); A partition (6) is provided in the placement cavity (4), the partition (6) divides the placement cavity (4) to form a plurality of placement units for accommodating the roll core (5), the partition (6) is connected to the inner side of the bottom cover (2), and slots (7) are provided on the partition (6), the slots (7) extend in a direction from the bottom cover (2) toward the end cover (3), and the slots (7) are arranged in a linear array on the partition (6).

2. The square battery cell housing according to claim 1, characterized in that: A plurality of partitions (6) are arranged in the placement cavity (4), and the plurality of partitions (6) are arranged at equal intervals along the arrangement direction of the winding cores (5).

3. The square battery cell housing according to claim 2, characterized in that: A guide groove (8) is provided on the inner wall of the side shell (1), and the side edge of the partition plate (6) is embedded in the guide groove (8).

4. The square battery cell housing according to claim 1, characterized in that: The end cover (3) is provided with a first polarity terminal (9) and a second polarity terminal (10), the first polarity terminal (9) being connected to the positive pole of the winding core (5), and the second polarity terminal (10) being connected to the negative pole of the winding core (5).

5. The square battery cell housing according to claim 1, characterized in that: The length of the partition (6) is shorter than the length of the side shell (1).

6. The square battery cell casing according to claim 1, characterized in that: The bottom cover (2) and the side shell (1) are sealed by welding, and the end cover (3) and the side shell (1) are sealed by welding.

7. The square battery cell casing according to claim 1, characterized in that: The slotted hole (7) is a rectangular through hole.

8. The heat conduction method of a square battery cell shell according to any one of claims 1 to 7, characterized in that: include: The partition (6) is located in a channel formed in a pair of winding cores (5), the partition (6) is used to fit the side wall of the winding core (5), the partition (6) plays a role in heat conduction, and heat exchange is formed between the winding core (5) and the partition (6) in the placement cavity (4); When the winding core (5) is charged or discharged, the partition (6) quickly conducts the heat generated by the winding core (5) during the charging or discharging from the bottom cover (2); When the winding core (5) is heated, the partition (6) guides the heat used to heat the winding core (5) into the placement cavity from the bottom cover (2).

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