A battery cell, a battery cell module, and a battery pack

Abstract

This invention provides a battery cell, a battery cell module, and a battery pack, comprising a housing and stacked cores. The housing is a hollow housing, and both the housing and the stacked cores have an inverted convex cross-section. The stacked cores are placed inside the housing, allowing them to fit completely against the housing. This invention, by configuring the housing according to the stacked cores, and by using the inverted convex cross-section of the housing, allows the stacked cores to fit completely against the housing, maximizing the use of the internal space of the battery cell and improving the volumetric energy density of the battery cell.

Description

Technical Field

[0001] This utility model relates to the field of battery cell technology, specifically to a battery cell, a battery cell module, and a battery pack. Background Technology

[0002] With the development of new energy vehicles, the requirements for power battery packs are becoming increasingly stringent. As the core component of the power battery pack, the quality of the battery cell determines the performance of the battery pack. Currently, the battery cells used in electric vehicles are becoming shorter in height to allow space for top and bottom protection; however, they are becoming longer than traditionally used cells, evolving into "long blade cells" and "short blade cells," etc. If these longer cells are still manufactured using the winding process, it will cause problems such as uneven internal structure and insufficient heat dissipation. In order to improve the heat dissipation performance and energy density of the cells, a stacking process is usually used to manufacture stacked cells. Then, the tabs of the stacked cells are directly connected to the terminals of the side cover plate of the cells through side terminals for energy output, or the tabs on the side of the stacked cells are connected to the terminals of the top cover plate of the cells through L-connecting tabs.

[0003] Both methods have certain drawbacks. Connecting different cell modules within a battery pack using side-mounted terminals presents operational difficulties, and the cell modules must be welded before being placed in the pack. For cells with side-mounted tabs and top-mounted terminals, there are gaps below the side connecting tabs. These gaps clearly do not meet the requirements for high energy density. Furthermore, when the cell side is subjected to mechanical damage such as compression, the area below the cell side is only protected by a thin aluminum shell, resulting in poor load-bearing capacity and a high risk of breakage. Utility Model Content

[0004] The technical problem to be solved by this invention is how to improve the volumetric energy density of battery cells.

[0005] This utility model solves the above-mentioned technical problems through the following technical means:

[0006] The first aspect of this utility model provides a battery cell, which includes a housing and a stacked core. The housing is a hollow housing, and the longitudinal section of both the housing and the stacked core is an inverted convex shape. The stacked core is placed inside the housing and can fit completely into the housing.

[0007] Beneficial effects: The present invention sets the shell according to the shape of the stacked core. The longitudinal cross-section of the shell is inverted convex. The stacked core is placed inside the shell and can fit completely with the shell, making the maximum use of the internal space of the cell and improving the volumetric energy density of the cell.

[0008] Preferably, the housing is formed by stamping a thin sheet.

[0009] Preferably, the stacked core includes a main body and electrode tabs. The main body is rectangular, and the electrode tabs are located on the upper part of the left and right sides of the main body.

[0010] Preferably, the upper end of the housing is connected to a cover plate, and the electrode tab is connected to the electrode post of the cover plate through an L-shaped plate.

[0011] The second aspect of this utility model provides a battery cell module, which includes the aforementioned battery cell, separator, and end plate, with multiple battery cells disposed between the end plates and connected to each other by separators.

[0012] Preferably, the spacer material is polycarbonate.

[0013] Beneficial effects: This utility model sets a spacer between the battery cells, which serves to fix and support the battery cells, and also serves to dissipate heat.

[0014] Preferably, the end plate is shaped like an inverted convex character.

[0015] Preferably, the battery cell and the end plate are connected by a spacer.

[0016] Preferably, double-sided adhesive is applied to both surfaces of the separator, and the separator and double-sided adhesive are used to attach and fix the battery cells to each other and to connect the battery cells to the end plate.

[0017] The third aspect of this utility model provides a battery pack, which includes the above-mentioned cell module, horizontal plate, longitudinal beam and energy-absorbing strip, with multiple cell modules arranged between the horizontal plate, the gap between adjacent cell modules being filled by the longitudinal beam, and the gap at the bottom side of the cell module being filled by the energy-absorbing strip.

[0018] Beneficial effects: This utility model uses energy-absorbing strips to protect the bottom of the battery cell module, and uses horizontal plates and longitudinal beams to support and constrain the battery cell module. At the same time, without increasing the battery pack space, it improves the utilization rate of the internal space of the battery pack, enhances the rigidity of the battery pack, and improves the safety of the battery pack.

[0019] Preferably, the energy-absorbing strip is made of rubber, sponge, or foam material.

[0020] Beneficial effects: This utility model sets an energy-absorbing strip at the bottom of the battery pack frame, which can achieve shock absorption and side protection.

[0021] Preferably, the energy-absorbing strip is bonded to the battery cell module with double-sided adhesive.

[0022] Preferably, the two ends of the longitudinal beam are connected to the transverse plate.

[0023] Beneficial effects: This utility model sets longitudinal beams in the gaps formed between adjacent rows of battery cell modules, which improves the rigidity of the battery pack and enhances its safety without taking up additional battery pack space.

[0024] Preferably, the two ends of the energy-absorbing strip are connected to the horizontal plate by applying double-sided adhesive tape. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the shell structure in Example 1;

[0026] Figure 2 This is a schematic diagram of the stacked core structure in Example 1;

[0027] Figure 3 This is a schematic diagram of the exploded structure of the battery cell in Example 1;

[0028] Figure 4 This is a cross-sectional view of the battery cell in Example 1;

[0029] Figure 5 This is a schematic diagram of the overall structure of the battery cell in Example 1;

[0030] Figure 6 This is a schematic diagram of the battery cell module in Example 2;

[0031] Figure 7 This is a schematic diagram of the exploded structure of the battery pack in Example 3;

[0032] Figure 8 This is a top view of the battery pack structure in Example 3;

[0033] Figure 9 This is a bottom view of the battery pack structure in Example 3. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should be noted that unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] Example 1

[0037] according to Figure 1-5 As shown, this embodiment provides a battery cell 1, which includes a housing 101, a stacked core 102, an L-shaped plate 103, and a cover plate 104.

[0038] according to Figure 1 As shown, the housing 101 is an internal hollow housing. The housing 101 has an opening for placing the stacked core 102. The opening faces upward. The longitudinal section of the housing 101 is an inverted convex shape. The longitudinal section represents the cross section obtained by cutting a plane along the length direction of the housing 101. The housing 101 is preferably formed by stamping a thin plate.

[0039] according to Figure 2 As shown, the stacked core 102 includes a main body 1021 and a tab 1022. The main body 1021 is rectangular, and the tabs 1022 are located on the upper part of the left and right sides of the main body 1021. The longitudinal section of the stacked core 102 is an inverted convex shape, and the housing 101 is set according to the overall shape of the stacked core 102.

[0040] The stacked core 102 is placed inside the housing 101, and the stacked core 102 is completely fitted to the housing 101.

[0041] The cover plate 104 is welded to the upper end of the housing 101, and the cover plate 104 serves to seal the housing 101.

[0042] The tab 1022 is connected to the pole post of the cover plate 104 via an L-shaped plate 103. The L-shaped plate 103 is engaged at the right angles on the left and right sides of the stacked core 102. One end of the plate is welded to the tab 1022 on the left and right sides of the stacked core 102, and the other end is welded to the pole post of the cover plate 104 on the top of the stacked core 102. Energy is input and output to the stacked core 102 through the pole post.

[0043] In this embodiment, the battery cell 1 is the energy storage unit of the battery pack. The housing 101 is set according to the overall shape of the stacked core 102, so that the stacked core 102 is placed inside the housing 101. The stacked core 102 and the housing 101 can fit together completely, making the maximum use of the space inside the battery cell 1 and improving the volumetric energy density of the battery cell 1.

[0044] Example 2

[0045] according to Figure 6 As shown, this embodiment provides a battery cell module, which includes the battery cell 1, separator 2 and end plate 3 of Embodiment 1.

[0046] The battery module includes multiple battery cells 1, which are arranged along the width direction of the battery cells 1.

[0047] Multiple battery cells 1 are arranged at both ends and clamped and fixed by end plates 3. The end plates 3 are in the shape of an inverted convex character, and the shape of the end plates 3 is exactly the same as the longitudinal cross-sectional shape of the battery cells 1. Without increasing the space of the battery cell module, the rigidity of the battery cell module is improved and the safety of the battery cell module is enhanced.

[0048] The cells 1 are connected to each other by spacers 2, and the cells 1 are connected to the end plate 3 by spacers 2. The spacers 2 are made of polycarbonate.

[0049] The specific connection method between the separator 2, the battery cell 1, and the end plate 3 is as follows: double-sided adhesive is applied to both surfaces of the separator 2, and the battery cell 1 is bonded to the end plate 3 through the separator 2 and the double-sided adhesive, thereby forming a battery cell module.

[0050] Example 3

[0051] according to Figure 7-9 As shown, this embodiment provides a battery pack, which includes the cell module of embodiment 2, a horizontal plate 4, an energy-absorbing strip 5, and a longitudinal beam 6.

[0052] The battery pack includes multiple cell modules, which are arranged along the width of the cell modules.

[0053] The end plates 3 of multiple battery cell modules are supported and constrained by the horizontal plate 4, which is made of aluminum alloy.

[0054] The gaps at the bottom of both sides of the battery cell module are filled by energy-absorbing strips 5. The energy-absorbing strips 5 are bonded to the battery cell module with double-sided adhesive, so that the energy-absorbing strips 5 can be fixed on the gaps. The shape of the energy-absorbing strips 5 is the same as the shape of the gaps, so that the outer edges of the upper and lower parts of the battery cell module are flush. The two ends of the energy-absorbing strips 5 are connected to the horizontal plate 4 with double-sided adhesive. The energy-absorbing strips 5 are made of rubber, sponge or foam material.

[0055] There are gaps between adjacent battery cell modules, and these gaps are rectangular in shape. These gaps are filled by longitudinal beams 6, which are made of aluminum alloy. The longitudinal beams 6 have the same shape as the gaps, and both ends of the longitudinal beams 6 are connected to the horizontal plates 4 by welding or other means.

[0056] In this embodiment, the battery pack is equipped with energy-absorbing strips 5 to increase the side protection of the battery pack without taking up additional internal space, and longitudinal beams 6 to increase the rigidity of the battery pack, thereby improving the safety of the battery pack.

[0057] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An electric cell, characterized by, It includes a shell (101) and a core (102). The shell (101) is an internal hollow shell. The longitudinal sections of both the shell (101) and the core (102) are inverted convex shapes. The core (102) is placed inside the shell (101) and can fit completely with the shell (101).

2. The battery cell according to claim 1, wherein the stacked core (102) includes a main body (1021) and a tab (1022), the main body (1021) is rectangular, and the tab (1022) is disposed on the upper part of the left and right sides of the main body (1021).

3. The battery cell according to claim 2, wherein the upper end of the housing (101) is connected to the cover plate (104), and the electrode tab (1022) is connected to the electrode post of the cover plate (104) through the L-shaped plate (103).

4. An electrochemical cell module, characterized by, It includes the battery cell (1), separator (2) and end plate (3) as described in any one of claims 1-3, wherein a plurality of battery cells (1) are provided between the end plates (3), and the battery cells (1) are connected to each other by the separator (2).

5. The battery cell module of claim 4, wherein, The end plate (3) is shaped like an inverted convex character.

6. The battery cell module of claim 4, wherein, The battery cell (1) is connected to the end plate (3) through a spacer (2).

7. The battery cell module of claim 6, wherein, Double-sided adhesive is applied to both surfaces of the separator (2). The separator (2) and the double-sided adhesive are used to bond the battery cell (1) to the battery cell (1) and to the end plate (3).

8. A battery pack, characterized by, It includes the battery cell module as described in any one of claims 4-7, a horizontal plate (4), an energy-absorbing strip (5) and a longitudinal beam (6), with multiple battery cell modules arranged between the horizontal plates (4), the gap between adjacent battery cell modules being filled by the longitudinal beam (6), and the gap at the bottom of the side of the battery cell module being filled by the energy-absorbing strip (5).

9. The battery pack of claim 8, wherein, The energy-absorbing strip (5) is bonded to the battery cell module with double-sided adhesive.

10. The battery pack of claim 8, wherein, The longitudinal beam (6) is connected to the transverse plate (4) at both ends.

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