Cell structure

Abstract

A cell structure, comprising a hollow cell casing (1), a cell accommodated in the cell casing (1), and a pole assembly hermetically assembled on the cell casing (1). The cell casing (1) is provided with an explosion-proof structure (2). The explosion-proof structure (2) and the pole assembly are respectively arranged on different end faces of the cell casing (1). A bottom support (3) is arranged between the explosion-proof structure (2) and the cell. A vent opening (4) is provided on the bottom support (3) and at a position corresponding to the explosion-proof structure (2). The bottom support (3) is further provided with a support structure (5) that divides the vent opening (4) and is used for supporting the cell.

Description

A cell structure Technical Field

[0001] This invention relates to the technical field of new energy batteries, and more specifically, to a cell structure. Background Technology

[0002] Lithium-ion batteries are widely used due to their high energy density, lack of memory effect, long cycle life per cell, high efficiency, cleanliness, and pollution-free operation. Battery safety has always been a top priority for the industry. Batteries with better safety are more favored by the market, and major battery manufacturers and OEMs are racing to design highly safe battery products, conducting rigorous thermal runaway tests to verify battery safety.

[0003] As the energy storage component of a battery, the battery cell can generate abnormal gases inside the casing during use due to factors such as the charger and internal chemical reactions. This can lead to excessive internal pressure, potentially causing a battery explosion. A battery explosion can damage electronic products or even injure the user. Furthermore, for large batteries used in new energy vehicles, buses, and energy storage power stations, battery explosions directly threaten human life and property.

[0004] Therefore, when the internal pressure of the battery is too high, in order to prevent the battery from exploding, the pressure inside the battery casing needs to be released. The traditional explosion-proof method is to install a rupture disc on the battery cover. When the internal pressure of the battery is too high, the pressure is released by bursting through the rupture disc. Later, in order to ensure that the heat emitted after the explosion-proof valve opens after the thermal runaway of the vehicle battery system will not be immediately transferred to the passenger compartment, the position of the explosion-proof valve was moved from the cover to the side of the casing in this scenario. However, this also brought new problems. After the thermal runaway of the stacked cells, the thermal expansion will block the explosion-proof valve, which will prevent the gas inside the cell from being transferred to the explosion-proof valve in time, increasing the risk of cell structure failure.

[0005] To address this, a Chinese utility model patent with authorization announcement number CN221447359U, application date November 20, 2023, entitled "Cell Support Base, Cell Housing, and Battery," discloses a technical solution that increases venting efficiency and further ensures cell safety by setting a base between the stacked cells and the housing, and opening holes in the base to guide gas to the explosion-proof valve. However, this solution, with vent holes on the base corresponding to the explosion-proof valve, still carries the risk that the expanded parts of the stacked cells may pass through the vent holes and block the explosion-proof valve when the stacked cells expand due to heat. Furthermore, the base, made of PP material, may melt and lose its supporting effect under high temperature and internal pressure, thereby further exacerbating thermal runaway of the battery. Summary of the Invention

[0006] 1. The problem to be solved

[0007] In view of the existing technical solutions with a base support, there is still a risk that the expanded part of the stacked core may pass through the vent hole and block the explosion-proof valve when the stacked core is heated and expanded. The present invention provides a cell structure that can more reliably ensure that there is sufficient vent space between the heated and expanded stacked core and the explosion-proof valve, thereby more effectively ensuring that the explosion-proof valve can be opened in time when the cell fails thermally, so as to ensure the safety performance of the cell.

[0008] 2. Technical Solution

[0009] To solve the above problems, the present invention adopts the following technical solution.

[0010] A battery cell structure includes a hollow cell housing, a single battery cell housed within the cell housing, and an electrode assembly sealed and connected to the cell housing. The cell housing has an explosion-proof structure, which is disposed on different end faces of the cell housing. A base support is provided between the explosion-proof structure and the single battery cell. A vent is provided on the base support corresponding to the explosion-proof structure. The base support also has a support structure that divides the vent and supports the single battery cell. In the event of thermal runaway of the battery cell, gas can be guided through the vent to the explosion-proof structure. The support structure at the vent further supports the single battery cell, preventing it from expanding and blocking the vent due to heat, thereby further ensuring the safety performance of the battery cell in the event of thermal runaway.

[0011] Furthermore, the vent is divided into at least a horizontal exhaust channel and a vertical exhaust channel, which are separated by a support structure. Both the horizontal and vertical exhaust channels are connected to the explosion-proof structure.

[0012] Furthermore, the battery cell includes a contact surface that contacts the base and other non-contact surfaces that do not contact the base. The transverse exhaust channel is used to receive gas discharged from the contact surface of the battery cell. The longitudinal exhaust channel is connected to the gap space formed between the non-contact surface of the battery cell and the battery cell housing, and is used to receive gas discharged from the contact surface and non-contact surface of the battery cell.

[0013] Preferably, the transverse exhaust channel includes a first connecting groove disposed opposite to the explosion-proof structure, and a second connecting groove that communicates with the first connecting groove and extends along the transverse direction of the base, for receiving gas discharged from the exhaust holes distributed on the contact surface of the battery cell, wherein the width of the second connecting groove is smaller than that of the first connecting groove in the longitudinal direction.

[0014] Preferably, the support structure includes at least two support portions extending longitudinally from one side of the base to the other side. The two support portions are intersected, with a connecting support point at the intersection, forming two sets of opposing transverse and longitudinal exhaust channels. Preferably, the base and top of the two support portions are hollowed-out to form air inlets for the transverse exhaust channels. Preferably, the angle at the intersection of the two support portions corresponding to the longitudinal exhaust channel is greater than the angle corresponding to the transverse exhaust channel. Specifically, the intersection of the two support portions forms an angle α corresponding to the longitudinal exhaust channel and an angle b corresponding to the transverse exhaust channel, where angle α is greater than angle b.

[0015] Furthermore, the vent is generally in the shape of a rectangular groove with two horizontal sides and a vertical side. There is a connecting angle between adjacent horizontal and vertical sides. The root and top of the two support parts are located on the two horizontal sides. The distance between the root or top of any support part and the nearest connecting angle is greater than the distance between it and the vertical line of the horizontal side.

[0016] Furthermore, the two ends of the base in the lateral direction have inclined guide surfaces on the side of the battery cell, and the corresponding end face of the base is flush with the end face of the battery cell housing, which can play a guiding role when the base is inserted. The fact that the end face of the base is flush with the end face of the battery cell housing can help with positioning when installing the base.

[0017] Furthermore, the base is made of aluminum, and the base has inwardly recessed notches at both ends of the inclined guide surface. The notches are provided with spot welding connections, which can prevent the welds formed during spot welding from affecting the sealing and encapsulation of the cell cover and the cell housing.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] (1) The battery cell structure provided by the present invention inserts a base between the battery cell shell and the battery cell body, and opens a vent on the base. In the event of thermal runaway of the battery cell, the gas can be guided through the vent to the explosion-proof structure. Furthermore, a support structure is set at the vent to further support the individual battery cell and prevent the individual battery cell from expanding due to heat and blocking the vent, thereby further ensuring the safety performance of the battery cell in the event of thermal runaway.

[0021] (2) The battery cell structure provided by the present invention divides the vent into a horizontal exhaust channel and a vertical exhaust channel through the support structure. The gas discharged from the contact surface of the battery cell is transmitted through the horizontal exhaust channel, and the gas emitted from the non-contact surface and the contact surface of the battery cell is transmitted through the vertical exhaust channel. This can fully transport the gas generated by the battery cell when it is heated to the explosion-proof structure, and fully ensure the safety performance of the battery cell in the event of thermal runaway.

[0022] (3) The battery cell structure provided by the present invention sets the transverse exhaust channel as a first connecting groove and a second connecting groove. The second connecting groove extends along the transverse direction of the base and can fully receive the gas discharged from the contact surface of the battery cell, thereby guiding the gas to the first connecting groove and the explosion-proof structure. In the longitudinal direction, the width of the second connecting groove is smaller than that of the first connecting groove, which can ensure that the base has sufficient structural strength.

[0023] (4) The cell structure provided by the present invention has a hollow structure between the root and top of the two support parts to form an air inlet for the transverse exhaust channel. The gas discharged from the non-contact surface of the cell can be transmitted through the gap between the cell and the cell shell, and finally enters the transverse exhaust channel through the air inlet and is transported to the explosion-proof structure. This enables more efficient exhaust in the case of thermal runaway of the cell and improves safety.

[0024] (5) The battery cell structure provided by the present invention has the roots and tops of the two support parts located on the two transverse sides. The distance between the root or top of any support part and the nearest connecting angle is greater than the distance between it and the perpendicular line of the transverse side, which can further strengthen the structural strength of the support structure and avoid the support structure from being deformed and damaged by pressure.

[0025] (6) The battery cell structure provided by the present invention has inclined guide surfaces on the side of the battery cell at both ends in the lateral direction of the base, which can play a guiding role when the base is inserted. The corresponding end face of the base is flush with the end face of the battery cell housing, which can help with positioning when the base is installed.

[0026] (7) The battery cell structure provided by the present invention uses aluminum as the base material, which can avoid the disadvantage that plastic material is easy to melt and deform and lose its supporting effect when heated or pressured. Moreover, it is not necessary to fix the base to the battery cell unit through a hot melt film. Instead, the battery cell unit is inserted into the battery cell housing, and the base is inserted into the gap between the battery cell unit and the battery cell housing. Then, the base is fixed to the battery cell housing by spot welding. In addition, the present invention provides an inwardly recessed notch at the end face of the base to form a spot welding connection part, which can avoid the weld point protrusion formed during spot welding from affecting the sealing and encapsulation of the battery cell cover and the battery cell housing. Attached Figure Description

[0027] Figure 1 is an internal structural diagram of the battery cell structure in this embodiment;

[0028] Figure 2 is a schematic diagram of the exhaust flow direction of the bottom support in the battery cell structure in this embodiment;

[0029] Figure 3 is a schematic diagram of the connection between the base and the battery cell housing in this embodiment;

[0030] Figure 4 is a schematic diagram of the base structure in this embodiment.

[0031] In the diagram: 1. Cell casing; 2. Explosion-proof structure; 3. Base support; 31. Inclined guide surface; 32. Notch; 33. Spot welded connection; 4. Vent; 41. Lateral exhaust channel; 411. First connecting groove; 412. Second connecting groove; 42. Longitudinal exhaust channel; 5. Support structure; 51. Support part; 511. Root; 512. Top; 52. Connecting support point; 53. Lateral side; 54. Longitudinal side; 55. Connecting angle. Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to embodiments.

[0033] In the prior art, such as Chinese patents with authorization announcement numbers CN221447359U and CN216563418U, a technical solution is disclosed that by setting a base between the stacked core and the shell, and opening holes in the base to guide gas to the explosion-proof valve, the venting efficiency is increased and the safety performance of the battery cell is further guaranteed. However, these technical solutions all involve opening venting holes in the base corresponding to the explosion-proof valve. When the stacked core expands due to heat, there is still a risk that the expanded part of the stacked core will pass through the venting hole and block the explosion-proof valve. Furthermore, the base of this solution is made of PP material, which will melt and lose its supporting effect under the influence of high temperature and internal pressure, thereby further aggravating the thermal runaway of the battery. In addition, these technical solutions set protrusions on the base substrate to fully transfer gas, in an attempt to retain a larger gap space between the stack core and the base. However, when the stack core expands, its expanded part may still pass through the vent and block the explosion-proof valve, thus preventing the explosion-proof valve from opening and exacerbating battery thermal runaway. Furthermore, setting protrusions on the base will cause the overall structure of the base to occupy more battery space, which is not conducive to the compactness of the battery structure, nor to maximizing the battery capacity.

[0034] Therefore, the present invention provides a battery cell structure, as shown in Figures 1 and 2, which mainly includes a battery cell housing 1, which is a hollow structure in which battery cell units are inserted or housed. The battery cell units can be a stacked core structure. It also includes an electrode assembly sealed and connected to the battery cell housing 1. Similar to or the same as the prior art, an explosion-proof structure 2 is provided on the battery cell housing 1. The explosion-proof structure 2 and the electrode assembly are respectively disposed on different end faces of the battery cell housing 1. The explosion-proof structure 2 can be an explosion-proof valve disposed on the battery cell housing 1. In one possible embodiment, a groove is opened on the outside of the battery cell housing 1, and an explosion-proof valve is installed in the groove.

[0035] To prevent thermally expanded individual cells from clogging the explosion-proof structure 2 and exacerbating thermal runaway, this embodiment includes a base support 3 between the explosion-proof structure 2 and the individual cells. A vent 4 is provided on the base support 3 corresponding to the location of the explosion-proof structure 2, thus isolating the explosion-proof structure 2 from the individual cells. Gas discharged from the individual cells can pass through the vent 4 to reach the explosion-proof structure 2, increasing the heat conduction space and ensuring the explosion-proof effect of the structure 2. To further prevent the thermally expanded portion of the individual cells from passing through the vent 4 and further clogging the explosion-proof structure 2, this embodiment also includes a support structure 5 on the base support 3 that divides the vent 4 and supports the individual cells. This ensures that gas discharged from the individual cells can reach the explosion-proof structure 2 through the vent 4, while the support structure 5 supports the individual cells, preventing the thermally expanded portion of the individual cells from passing through the vent and compressing the explosion-proof structure 2, thereby further ensuring the safety performance of the battery. In one possible embodiment, the support structure 5 can be any shape structure covering the vent, as long as it supports the battery cell while ensuring that gas passes through the vent. The support structure 5 can be integrally formed with the base 3, or it can be fixed together by welding, gluing, screw connection or other connection methods.

[0036] The battery cell structure provided in this embodiment has a base support 3 inserted between the battery cell housing 1 and the battery cell body. A vent 4 is opened on the base support 3. In the event of thermal runaway of the battery cell, gas can be guided through the vent 4 to the explosion-proof structure 2. A support structure 5 is set at the vent 4 to further support the individual battery cell and prevent the individual battery cell from expanding due to heat and blocking the vent 4, thereby further ensuring the safety performance of the battery cell in the event of thermal runaway.

[0037] Based on the above embodiments, in order to fully guide the gas discharged from the battery cell to the vent 4 and the explosion-proof structure 2, as shown in Figures 1, 2 and 4, this embodiment divides the vent 4 into at least a horizontal exhaust channel 41 and a vertical exhaust channel 42. The horizontal exhaust channel 41 and the vertical exhaust channel 42 are separated by a support structure 5, and both the horizontal exhaust channel 41 and the vertical exhaust channel 42 are connected to the explosion-proof structure 2. Specifically, each battery cell includes a contact surface that contacts the base 3 and other non-contact surfaces that do not contact the base 3. A transverse exhaust channel 41 extends along the transverse direction of the battery cell housing 1 and directly abuts against the contact surface of the battery cell. It can directly receive the gas discharged from the contact surface of the battery cell and transmit it to the explosion-proof structure 2. Because the base 3 and the battery cell abut against each other, gas generated from other non-contact surfaces of the battery cell cannot pass through the transverse exhaust channel 41. Therefore, in this embodiment, a longitudinal exhaust channel 42 is provided, which communicates with the gap space formed between the non-contact surface of the battery cell and the battery cell housing 1, thereby receiving the gas discharged from the non-contact surface of the battery cell. Simultaneously, it also contacts the contact surface of the battery cell, and therefore can also receive the gas discharged from the contact surface. It should be noted that in this embodiment, the direction in which the battery cell housing 1 is inserted into the battery cell is considered the transverse direction, and the direction perpendicular to it is considered the longitudinal direction.

[0038] It should also be noted that when the base 3 cannot completely cover the contact surface of the battery cell, the parts of the battery cell whose contact surface is not in contact with the base 3 or cannot transmit gas through the transverse exhaust channel 41 can be vented through the longitudinal exhaust channel 42.

[0039] In this embodiment, the vent 4 is divided into a horizontal exhaust channel 41 and a vertical exhaust channel 42 by the support structure 5. The gas discharged from the contact surface of the battery cell is transmitted through the horizontal exhaust channel 41, and the gas emitted from the non-contact surface and the contact surface of the battery cell is transmitted through the vertical exhaust channel 42. This allows the gas generated by the battery cell when heated to be fully delivered to the explosion-proof structure 2, thus fully ensuring the safety performance in the event of thermal runaway of the battery cell.

[0040] In existing battery cell structures, multiple vent holes are formed on the side of the battery cell that contacts the base 3. To accommodate the gas emitted from these vent holes on the battery cell's contact surface, this embodiment includes a first connecting groove 411 opposite to the explosion-proof structure 2, and a second connecting groove 412 that communicates with the first connecting groove 411 and extends laterally along the base 3. This second connecting groove 412 receives the gas emitted from the vent holes on the battery cell's contact surface. In the longitudinal direction, the width of the second connecting groove 412 is smaller than that of the first connecting groove 411. This embodiment uses a first connecting groove 411 and a second connecting groove 412 for the transverse exhaust channel. The second connecting groove 412 extends laterally along the base, effectively receiving the gas emitted from the battery cell's contact surface and guiding it to the first connecting groove 411 and the explosion-proof structure 2. Furthermore, the width of the second connecting groove 412 is smaller than that of the first connecting groove 411 in the longitudinal direction, ensuring sufficient structural strength for the base 3.

[0041] In one possible embodiment, the support structure 5 includes at least two support portions 51 extending longitudinally from one side of the base 3 to the other side. The two support portions 51 are intersected, with a connecting support point 52 at the intersection, forming two sets of opposing transverse exhaust channels 41 and longitudinal exhaust channels 42. To ensure that the longitudinal exhaust channel 42 is connected to the gap space formed between the non-contact surface of the battery cell and the battery cell housing 1, in this embodiment, the base 511 and top 512 of the two support portions 51 are hollowed out to form the air inlet of the transverse exhaust channel 41, ensuring that the gas in these gap spaces can be transported to the explosion-proof structure 2 through the transverse exhaust channel 41. In one possible embodiment, the two rod-shaped or strip-shaped support portions 51 intersect to form an X-shaped structure, and the longitudinal exhaust channel 42 and the portion of the transverse exhaust channel 41 near the connecting support point 52 are generally triangular in shape.

[0042] To ensure the structural strength of the support structure 5, in one possible embodiment, the angle at the intersection of the support parts 51 corresponding to the longitudinal exhaust channel 42 is greater than the angle at the corresponding transverse exhaust channel 41. Specifically, the intersection of two support parts 51 forms an angle 'a' corresponding to the longitudinal exhaust channel 42 and an angle 'b' corresponding to the transverse exhaust channel 41, with angle 'a' being greater than angle 'b'. Further, the vent 4 is generally a rectangular groove with two transverse sides 53 and a longitudinal side 54. Adjacent transverse sides 53 and longitudinal sides 54 are connected by a connecting angle 55. The roots 511 and tops 512 of the two support parts 51 are located on the two transverse sides 53. The distance between the root 511 or top 512 of any support part 51 and the nearest connecting angle 55 is greater than the distance between it and the perpendicular bisector of the transverse side 53. This further strengthens the structural strength of the support structure 5 and prevents it from deforming or being damaged under pressure.

[0043] In existing technologies, the base support 3 is typically made of plastic and fixed to the battery cell using a hot-melt film. The battery cell and base support 3 are then installed together inside the battery housing 1. However, in this design, the base support 3 can melt and lose its supporting function under high temperature and internal pressure, causing the battery cell to further block the explosion-proof structure and exacerbating thermal runaway. Therefore, in this embodiment, the base support 3 is made of aluminum. After the battery cell is inserted into the battery housing 1, the base support 3 is directly inserted into the gap between the battery cell and the battery housing 1, and then fixed inside the battery housing 1 by spot welding. To facilitate insertion of the base support 3, as shown in Figure 4, this embodiment also provides inclined guide surfaces 31 on both ends of the base support 3 in the lateral direction, facing the battery cell. The corresponding end face of the base support 3 is flush with the end face of the battery housing 1. The inclined guide surfaces 31 provide guidance during insertion, and the flush alignment of the end face of the base support 3 with the end face of the battery housing 1 aids in positioning during installation.

[0044] When welding the base 3 and the cell housing 1 by spot welding, it was found that the weld point protrusion formed by spot welding can easily hinder the sealing of the end cover to the cell housing 1. Therefore, as shown in Figure 3, in this embodiment, the base 3 is provided with inwardly recessed notches 32 at both ends of the inclined guide surface 31, and spot welding connection parts 33 are provided at the notches 32, so as to avoid the weld points formed during spot welding from affecting the sealing and encapsulation of the cell cover and the cell housing 1.

[0045] In the description of this patent, it should be understood that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0046] In this patent, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications should fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An electric cell structure comprising a hollow electric cell housing (1), an electric cell monomer accommodated in the electric cell housing (1), and a pole assembly sealed to the electric cell housing (1), the electric cell housing (1) being provided with an explosion-proof structure (2), the explosion-proof structure (2) and the pole assembly being respectively arranged on different end faces of the electric cell housing (1), characterized in that, A base support (3) is provided between the explosion-proof structure (2) and the battery cell. A vent (4) is provided on the base support (3) corresponding to the explosion-proof structure (2). A split vent (4) is also provided on the base support (3) and a support structure (5) for supporting the battery cell is also provided.

2. The cell structure of claim 1, wherein, The vent (4) is divided into at least a horizontal exhaust channel (41) and a vertical exhaust channel (42), which are separated by a support structure (5). Both the horizontal exhaust channel (41) and the vertical exhaust channel (42) are connected to the explosion-proof structure (2).

3. The cell structure of claim 2, wherein, The battery cell includes a contact surface that contacts the base (3) and other non-contact surfaces that do not contact the base (3). The transverse exhaust channel (41) is used to receive gas discharged from the contact surface of the battery cell. The longitudinal exhaust channel (42) is connected to the gap space formed between the non-contact surface of the battery cell and the battery cell housing (1) and is used to receive gas discharged from the contact surface and non-contact surface of the battery cell.

4. The cell structure of claim 3, wherein, The transverse exhaust channel (41) includes a first connecting groove (411) disposed opposite to the explosion-proof structure (2), and a second connecting groove (412) connected to the first connecting groove (411) and extending in the transverse direction of the base (3) for receiving gas discharged from the exhaust holes distributed on the contact surface of the battery cell. In the longitudinal direction, the width of the second connecting groove (412) is smaller than that of the first connecting groove (411).

5. The cell structure of claim 2, wherein, The support structure (5) includes at least two support parts (51) extending longitudinally from one side of the base (3) to the other side. The two support parts (51) are arranged crosswise, and the crosswise part has a connecting support point (52) to form two sets of opposite transverse exhaust channels (41) and longitudinal exhaust channels (42).

6. The cell structure of claim 5, wherein, The two support parts (51) have a hollow structure between their root (511) and top (512) to form the air inlet of the transverse exhaust channel (41).

7. The cell structure of claim 5, wherein, The intersection of the two support parts (51) forms an angle a corresponding to the longitudinal exhaust channel (42) and an angle b corresponding to the transverse exhaust channel (41), with angle a being greater than angle b.

8. The cell structure of claim 5, wherein, The vent (4) is a rectangular groove with two horizontal sides (53) and a vertical side (54). There is a connecting angle (55) between adjacent horizontal sides (53) and vertical side (54). The root (511) and top (512) of the two support parts (51) are located on the two horizontal sides (53). The distance between the root (511) or top (512) of any support part (51) and the nearest connecting angle (55) is greater than the distance between it and the vertical line of the horizontal side (53).

9. The cell structure of any of claims 1-8, wherein, The bottom support (3) has inclined guide surfaces (31) on both ends of the battery cell in the lateral direction, and the corresponding end face of the bottom support (3) is flush with the end face of the battery cell housing (1).

10. The cell structure of claim 9, wherein, The base (3) is made of aluminum. The base (3) has inwardly recessed notches (32) at both ends of the inclined guide surface (31), and spot welded connection parts (33) are provided at the notches (32).

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