Battery system

Abstract

The utility model discloses a battery system. The battery system comprises a box body, a battery cell module, a tab supporting piece and an end plate, the box body is provided with a mounting cavity. And the battery cell module is arranged in the mounting cavity. The tab supporting piece is arranged at the end part of the battery cell module, a first exhaust hole is formed in the tab supporting piece, and the first exhaust hole is communicated with the mounting cavity. The end plate is arranged on the side, away from the battery cell module, of the tab supporting piece, the end plate is connected with the tab supporting piece, a second exhaust hole is formed in the end plate, the second exhaust hole is communicated with the first exhaust hole, and the second exhaust hole is communicated with the outside of the box body. When the battery cell module abnormally generates gas, the gas can be directionally discharged out of the box body through the mounting cavity, the first exhaust hole and the second exhaust hole in sequence. The mounting cavity, the first exhaust hole and the second exhaust hole form a directional exhaust channel. According to the battery system, gas can be quickly and orderly discharged, the risk of sudden pressure increase in the battery system is effectively reduced, and the safety of the battery system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery equipment, in particular to a battery system. Background Art

[0002] With the rapid development of new energy technologies, battery systems, as core components for energy storage and supply, are widely used in the field of electric vehicles.

[0003] Currently, in existing battery systems, end plates, which serve as the end supports and fixing structures for the battery cell modules, are typically enclosed, making it impossible to form a directional and efficient exhaust channel. The connection between traditional end plates and battery cell modules is mostly a sealed structure. When abnormal gas production occurs in the battery cell module, the gas tends to accumulate inside the battery system. The inability to exhaust the gas to the outside of the box through the end plates may cause the gas to accumulate in other areas of the box, increasing the risk of thermal runaway and reducing the safety of the battery system. Utility Model Content

[0004] The main purpose of the present invention is to provide a battery system, aiming to solve the technical problem of low safety of the battery system.

[0005] In order to achieve the above-mentioned purpose of the utility model, the present utility model provides a battery system.

[0006] A battery system comprising:

[0007] A box body, wherein the box body is provided with a mounting cavity;

[0008] A battery cell module, the battery cell module being disposed in the mounting cavity;

[0009] A tab support, the tab support being disposed at an end of the battery cell module, the tab support being provided with a first exhaust hole, the first exhaust hole being in communication with the mounting cavity; and

[0010] An end plate is arranged on a side of the tab support away from the battery cell module, and the end plate is connected to the tab support. The end plate is provided with a second exhaust hole, the second exhaust hole is connected to the first exhaust hole, and the second exhaust hole is connected to the outside of the box.

[0011] In one embodiment, the battery system includes a sealing film, and the sealing film is provided on the hole wall of the first exhaust hole;

[0012] When the temperature in the installation cavity is lower than a temperature threshold, the sealing film seals the first exhaust hole. When the temperature in the installation cavity is higher than the temperature threshold, the sealing film is carbonized to connect the first exhaust hole with the second exhaust hole.

[0013] In one embodiment, a first fireproof glue is filled between the tabs of the battery cell module and the end plate.

[0014] In one embodiment, the battery system includes a filler, the filler is disposed between the first fireproof glue and the first vent, and the filler abuts against the sealing film;

[0015] When the temperature in the installation cavity is lower than the temperature threshold, the filler isolates the first fireproof glue and the first exhaust hole. When the temperature in the installation cavity is higher than the temperature threshold, the filler is carbonized to connect the first exhaust hole with the installation cavity.

[0016] In one embodiment, a plurality of the first exhaust holes are provided, and the plurality of first exhaust holes are spaced apart along the length direction of the tab support.

[0017] In one embodiment, a first snap-fit ​​portion is extended from one end of the tab support, a first slot is provided on the inner side wall of the end plate facing the tab support, and the first snap-fit ​​portion is locked in the first slot; and / or

[0018] A second buckle portion is extended from the other end of the tab support, and a second slot is provided on the inner side wall of the end plate facing the tab support, and the second buckle portion is locked in the second slot.

[0019] In one embodiment, the tab support is provided with an exhaust groove, the exhaust groove is provided between the first exhaust hole and the second exhaust hole, and the exhaust groove is communicated with the first exhaust hole and the second exhaust hole respectively.

[0020] In one embodiment, a plurality of the tab supports are provided, the plurality of tab supports are arranged along the stacking direction of the battery cells, and the plurality of tab supports are connected to the inner sidewall of the end plate facing the tab supports.

[0021] In one embodiment, the battery system includes a liquid cooling plate, which is disposed in the mounting cavity and on a side of the battery cell module, and is connected to the end plate.

[0022] In one embodiment, a second fireproof glue is filled between the two battery core modules connected in series.

[0023] Beneficial effects:

[0024] The battery system of the present invention includes a housing, a cell module, a tab support, and an end plate. The housing is provided with an installation cavity. The cell module is disposed within the installation cavity. The tab support is disposed at the end of the cell module and is provided with a first exhaust hole, which is in communication with the installation cavity. The end plate is disposed on the side of the tab support facing away from the cell module and is connected to the tab support. The end plate is provided with a second exhaust hole, which is in communication with the first exhaust hole and is in communication with the exterior of the housing. During operation, the first exhaust hole provided by the tab support is directly in communication with the installation cavity, and the second exhaust hole provided by the end plate is in communication with the first exhaust hole and the exterior of the housing. When the cell module produces gas abnormally, the gas can be discharged in a directional manner to the exterior of the housing through the installation cavity, the first exhaust hole, and the second exhaust hole in sequence. The installation cavity, the first exhaust hole, and the second exhaust hole form a directional exhaust channel. The battery system can discharge gas quickly and orderly, effectively reducing the risk of sudden pressure increase within the battery system and improving the safety of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an exploded view of a battery system according to an embodiment of the present invention.

[0026] Figure 2 It is a partial structural diagram of a battery system according to an embodiment of the present invention.

[0027] Figure 3 It is a structural schematic diagram of the end plate, tab support and battery cell module of one embodiment of the present invention.

[0028] Figure 4 It is a top view of the end plate, tab support and battery cell module of one embodiment of the present invention.

[0029] Figure 5 yes Figure 4 Cross-sectional view at AA in the middle.

[0030] Figure 6 yes Figure 5 Enlarged view of point B in the middle.

[0031] Figure 7 It is a structural schematic diagram of a tab support member according to an embodiment of the present invention.

[0032] Figure 8 This is a front view of a tab support member according to an embodiment of the present invention.

[0033] Figure 9 yes Figure 8 Cross-sectional view at CC.

[0034] in:

[0035] 100, box body; 110, installation cavity;

[0036] 200, battery cell module;

[0037] 300, tab support; 310, first exhaust hole; 320, exhaust groove; 330, first buckle portion; 340, second buckle portion;

[0038] 400, end plate; 410, second exhaust hole; 420, sealing film; 430, filler;

[0039] 500, liquid cooling plate;

[0040] 600, the first fireproof glue; 610, the second fireproof glue.

[0041] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and 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 direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0044] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0046] like Figures 1 to 3 As shown, in some embodiments, a battery system includes a housing 100, a cell module 200, a tab support 300, and an end plate 400. The housing 100 is provided with an installation cavity 110. The cell module 200 is disposed in the installation cavity 110. The tab support 300 is disposed at the end of the cell module 200, and the tab support 300 is provided with a first exhaust hole 310, which is connected to the installation cavity 110. The end plate 400 is disposed on a side of the tab support 300 facing away from the cell module 200, and the end plate 400 is connected to the tab support 300. The end plate 400 is provided with a second exhaust hole 410. The second exhaust hole 410 is connected to the first exhaust hole 310, and the second exhaust hole 410 is connected to the outside of the housing 100.

[0047] During operation, the first exhaust hole 310 provided in the tab support 300 is directly connected to the mounting cavity 110. The second exhaust hole 410 provided in the end plate 400 is connected to the first exhaust hole 310 and the outside of the box body 100. When thermal runaway occurs in the battery cell module 200, the gas can be discharged to the outside of the box body 100 in a direction through the mounting cavity 110, the first exhaust hole 310, and the second exhaust hole 410 in sequence. The mounting cavity 110, the first exhaust hole 310, and the second exhaust hole 410 form a directional exhaust channel. The battery system can quickly and orderly discharge gas, effectively reducing the risk of sudden pressure increase inside the battery system and improving the safety of the battery system.

[0048] Specifically, the housing 100 defines a mounting cavity 110. Mounted within this cavity are components such as the cell modules 200, tab supports 300, end plates 400, and a liquid cooling plate 500. The housing 100 provides physical protection for these components, isolating them from external dust, moisture, and impurities. It also prevents direct contact between the cell modules 200 and circuitry within the housing and external objects, reducing the risk of short circuits and electrical leakage.

[0049] Specifically, multiple groups of battery cells are stacked and welded horizontally to form a battery module 200. Multiple battery modules 200 are arranged and connected in series to form a battery module assembly. The tabs of the stacked cells are connected sequentially through laser welding, ultrasonic welding, or other methods, forming an electrical path between the cells and mechanically securing them, thereby integrating the dispersed cells into a single battery module 200 with a specific voltage and capacity.

[0050] Specifically, the battery system includes a liquid cooling plate 500. The liquid cooling plate 500 is positioned within the mounting cavity 110 and is attached to the side of the battery cell module 200. The liquid cooling plate 500 is connected to the end plate 400. The housing 100 and the liquid cooling plate 500 together form the housing 100 liquid cooling assembly. Exhaust channels for dedicated modules are designed between adjacent liquid cooling plates 500 and between the liquid cooling plate 500 and the housing 100. The hot air is then exhausted through explosion-proof valves.

[0051] Please refer to Figure 8 and Figure 9 In some embodiments, the battery system includes a sealing film 420. The sealing film 420 is disposed on the wall of the first vent 310. When the temperature within the mounting cavity 110 is below a temperature threshold, the sealing film 420 seals the first vent 310. When the temperature within the mounting cavity 110 is above the temperature threshold, the sealing film 420 is carbonized, thereby connecting the first vent 310 with the second vent 410.

[0052] Specifically, sealing film 420 is made of a material with specific thermal stability. Specifically, sealing film 420 can be made of flame-retardant resin, high-temperature-resistant composite film, etc. The carbonization temperature of sealing film 420 is precisely set to the safe temperature threshold of the battery system, typically based on the gas production temperature in the initial stage of thermal runaway of the battery cell, for example, 80-150°C.

[0053] When the battery system is operating normally, the temperature inside the installation cavity 110 is lower than the temperature threshold, the sealing film 420 maintains physical integrity, and fits tightly against the wall of the first exhaust hole 310 to form a sealing structure to prevent leakage of electrolyte vapor or trace gases. When the battery is operating normally, the battery cell may produce a small amount of electrolyte volatiles or trace gases. The sealing film 420 can prevent these substances from leaking through the first exhaust hole 310 to the outside of the box 100 or reacting with other components by sealing the first exhaust hole 310, thereby maintaining the stability of the internal environment of the battery system. In addition, the sealing film 420 can isolate external contaminants from entering the installation cavity 110, preventing dust, water vapor, etc. outside the box 100 from entering the installation cavity 110 through the first exhaust hole 310, preventing the battery cell module 200 from being contaminated or short-circuited, and ensuring the long-term operational reliability of the battery system.

[0054] When an abnormality occurs in the battery cell module 200 and the temperature in the installation cavity 110 rises and exceeds the temperature threshold, the sealing film 420 undergoes chemical decomposition or physical carbonization due to the high temperature, causing the sealing film 420 to be broken or melted, and the first exhaust hole 310 and the second exhaust hole 410 of the end plate 400 form a connecting path, so that the high-temperature gas generated by the battery cell module 200 can be discharged along the first exhaust hole 310 and the second exhaust hole 410 to the outside of the box body 100, thereby avoiding gas accumulation in the installation cavity 110.

[0055] Please refer to Figure 2 In some embodiments, a first fireproof adhesive 600 is filled between the tabs of the battery cell module 200 and the end plate 400. There is an assembly gap between the tabs of the battery cell module 200 and the end plate 400, as well as irregular spaces in the tab welding area. The first fireproof adhesive 600 solidifies after filling, forming a continuous, dense sealing layer. The first fireproof adhesive 600 blocks the diffusion path of gas to other areas, allowing the gas generated by the battery cell module 200 to flow to the first exhaust hole 310 of the tab support 300 and then be discharged through the second exhaust hole 410 of the end plate 400, thereby improving the exhaust efficiency of the battery system.

[0056] Specifically, the first fireproof adhesive 600 can be an epoxy resin-based fireproof adhesive, a silicone-based fireproof adhesive, a composite system fireproof adhesive, or the like.

[0057] Specifically, a second fireproof adhesive 610 is filled between two battery modules 200 connected in series. The battery modules 200 connected in series are typically closely arranged along the length or width, with a small gap between the battery modules 200. The second fireproof adhesive 610 fills this gap, and after curing, the adhesive forms a continuous, dense structure. By blocking the gap between the modules, the second fireproof adhesive 610 cuts off the lateral diffusion path of the gas, allowing the gas to be discharged in a directional manner along the installation cavity 110, the first exhaust hole 310, and the second exhaust hole 410, thereby preventing the risk of gas "randomly" spreading.

[0058] Specifically, the second fireproof adhesive 610 can be an epoxy resin-based fireproof adhesive, a silicone-based fireproof adhesive, a composite system fireproof adhesive, etc.

[0059] Please refer to Figures 4 to 6 In some embodiments, the battery system includes a filler 430 disposed between the first fireproof adhesive 600 and the first vent 310 , with the filler 430 abutting the sealing film 420 . When the temperature within the mounting cavity 110 is below a temperature threshold, the filler 430 isolates the first fireproof adhesive 600 from the first vent 310 . When the temperature within the mounting cavity 110 is above the temperature threshold, the filler 430 is carbonized, thereby connecting the first vent 310 to the mounting cavity 110 . Specifically, the filler 430 is an air bag foam.

[0060] It should be noted that the air bag foam serves as a flexible filler 430, tightly filling the space between the first fireproof adhesive 600 and the first vent 310 and abutting against the sealing film 420. The air bag foam forms an elastic seal when compressed, which can block direct contact between the first fireproof adhesive 600 and the first vent 310, thereby preventing the vent from being blocked when the first fireproof adhesive 600 cures.

[0061] When the battery cell experiences thermal runaway, causing the temperature inside the mounting cavity 110 to exceed a threshold, the polyethylene and polyurethane components of the airbag foam undergo thermal decomposition and carbonization. The carbonized foam structure collapses, forming a loose, porous residue or directly decomposing into gas. This breaks open the previously isolated space, allowing the high-pressure gas inside the mounting cavity 110 to directly impact the sealing film 420. When the airbag foam and sealing film 420 simultaneously carbonize and fail, the first vent 310 is fully connected to the mounting cavity 110 through the carbonized foam channel, ultimately allowing the gas to be discharged in a targeted manner through the exhaust channel.

[0062] Please refer to Figure 7 In some embodiments, the tab support 300 can be a long, block-shaped structure. The tab support 300 adopts a long, block-shaped design, with its length aligned with the tab arrangement direction of the battery cell module 200. The tab support 300 provides continuous linear support for the tab through its rigid or semi-rigid properties.

[0063] Specifically, a plurality of first exhaust holes 310 are provided. The plurality of first exhaust holes 310 are spaced apart along the length direction of the tab support 300. Specifically, the intervals between two adjacent first exhaust holes 310 are equal.

[0064] Specifically, the first exhaust hole 310 may be a circular hole.

[0065] In some embodiments, the tab support 300 is provided with an exhaust groove 320. The exhaust groove 320 is provided between the first exhaust hole 310 and the second exhaust hole 410, and the exhaust groove 320 is respectively connected to the first exhaust hole 310 and the second exhaust hole 410. Specifically, the exhaust groove 320 is provided along the length of the tab support 300. Specifically, the plurality of first exhaust holes 310 are all connected to the exhaust groove 320.

[0066] It should be noted that the length of the exhaust groove 320 can cover the distribution range of the multiple first exhaust holes 310. The width and depth of the exhaust groove 320 are adapted to the gas circulation requirements. When thermal runaway occurs in the battery cells at different positions in the battery cell module 200, the generated high-temperature gas is released through the multiple first exhaust holes 310 and converges into the exhaust groove 320. The gas in the exhaust groove 320 is guided into the second exhaust hole 410 and finally discharged to the outside of the battery system through the second exhaust hole 410.

[0067] Please refer to Figure 7 In some embodiments, a first latch portion 330 is provided on one end of the tab support 300. A first latching groove is provided on the inner sidewall of the end plate 400 facing the tab support 300. The first latching portion 330 is latched in the first latching groove. A second latching portion 340 is provided on the other end of the tab support 300. A second latching groove is provided on the inner sidewall of the end plate 400 facing the tab support 300. The second latching portion 340 is latched in the second latching groove.

[0068] Please refer to Figure 3 Specifically, a plurality of tab supports 300 are provided. The plurality of tab supports 300 are arranged along the stacking direction of the battery cells, and the plurality of tab supports 300 are connected to the inner sidewall of the end plate 400 facing the tab supports 300 .

[0069] It should be noted that in the battery cell module 200, the tabs of multiple battery cells are often arranged in layers in the vertical direction, such as a stacked battery cell group. Each layer of battery cells corresponds to a group of tabs. Multiple tab supports 300 are arranged in the vertical direction and can correspond one-to-one to the tabs arranged in layers. Each tab support 300 specifically supports the tabs of a specific layer to form a layered bearing structure. This structure prevents a single tab support 300 from bearing the concentrated load of multiple layers of tabs by dispersing the tab's own gravity, the lateral force generated by the expansion of the battery cell, and the force of vibration and impact, thereby reducing the risk of deformation and breakage of the tabs due to excessive local force.

[0070] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery system, characterized in that: include: A box body, wherein the box body is provided with a mounting cavity; A battery cell module, the battery cell module being disposed in the mounting cavity; A tab support, the tab support being disposed at an end of the battery cell module, the tab support being provided with a first exhaust hole, the first exhaust hole being in communication with the mounting cavity; and An end plate is arranged on a side of the tab support away from the battery cell module, and the end plate is connected to the tab support. The end plate is provided with a second exhaust hole, the second exhaust hole is connected to the first exhaust hole, and the second exhaust hole is connected to the outside of the box.

2. The battery system according to claim 1, wherein: The battery system includes a sealing film, which is arranged on the hole wall of the first exhaust hole; When the temperature in the installation cavity is lower than a temperature threshold, the sealing film seals the first exhaust hole. When the temperature in the installation cavity is higher than the temperature threshold, the sealing film is carbonized to connect the first exhaust hole with the second exhaust hole.

3. The battery system according to claim 2, characterized in that A first fireproof glue is filled between the tabs of the battery module and the end plates.

4. The battery system according to claim 3, characterized in that The battery system includes a filler, which is arranged between the first fireproof glue and the first exhaust hole, and the filler abuts against the sealing film; When the temperature in the installation cavity is lower than the temperature threshold, the filler isolates the first fireproof glue and the first exhaust hole. When the temperature in the installation cavity is higher than the temperature threshold, the filler is carbonized to connect the first exhaust hole with the installation cavity.

5. The battery system according to claim 1, wherein: The first exhaust holes are provided in plurality, and the plurality of first exhaust holes are arranged at intervals along the length direction of the tab support.

6. The battery system according to claim 1, wherein: A first buckle portion is extended from one end of the tab support, a first slot is provided on the inner side wall of the end plate facing the tab support, and the first buckle portion is locked in the first slot; and / or A second buckle portion is extended from the other end of the tab support, and a second slot is provided on the inner side wall of the end plate facing the tab support, and the second buckle portion is locked in the second slot.

7. The battery system according to claim 1, characterized in that The tab support is provided with an exhaust groove, which is provided between the first exhaust hole and the second exhaust hole, and the exhaust groove is communicated with the first exhaust hole and the second exhaust hole respectively.

8. The battery system according to claim 1, wherein: There are multiple tab supports, which are arranged along the stacking direction of the battery cells, and are connected to the inner sidewalls of the end plates facing the tab supports.

9. The battery system according to claim 1, wherein: The battery system includes a liquid cooling plate, which is arranged in the installation cavity and on the side of the battery cell module, and is connected to the end plate.

10. The battery system according to claim 1, wherein: A second fireproof glue is filled between the two battery core modules connected in series.

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