Battery module and battery system

Abstract

The utility model discloses a battery module and a battery system, the battery module comprises a module shell and a soft package battery cell unit, an accommodating space is formed in the module shell, the bottom of the accommodating space is a bottom plate of the module shell, the soft package battery cell unit is arranged in the accommodating space, the bottom of the soft package battery cell unit abuts against the bottom plate, and the bottom of the soft package battery cell unit abuts against the bottom plate. The soft package battery cell unit is provided with two side sealing edges, a protruding part protruding out of the bottom of the soft package battery cell unit is formed at the bottom of each side sealing edge, and a groove for avoiding the protruding part is formed in the bottom plate. According to the battery module disclosed by the utility model, the avoidance structure is arranged on the surface, facing the soft package battery cell unit, of the bottom plate, so that the convex part formed by the two side sealing edges is prevented from being folded upwards, a weak point is prevented from being formed at the upwards bent part of the convex part, and the service life of the soft package battery cell unit is prolonged. Meanwhile, an avoiding structure is formed under the condition that the bottom plate is not thickened, the avoiding effect can be achieved, the thickness of the bottom plate is reduced, the space utilization rate of the module is increased, and cost is reduced.

Description

Technical Field

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

[0002] Soft-pack batteries are a common structural form of lithium-ion batteries. Their basic components are a bare battery body, an aluminum-plastic film structure encapsulated on the outside of the bare battery body, and an electrolyte filled in the aluminum-plastic film structure.

[0003] At present, the battery module includes a soft-pack battery cell and a battery shell. An accommodating space is formed inside the battery shell. The soft-pack battery cell is arranged in the accommodating space, and the bottom aluminum-plastic film of the soft-pack battery cell is in contact with the bottom plate of the accommodating space to facilitate the heat dissipation of the soft-pack battery cell. Among them, the soft-pack battery cell has two side seals, and a protrusion is formed at the bottom of the side seal. However, in the existing technology, because the protrusion formed by the side seal will interfere with the bottom plate, the side seal is usually folded upward in the direction away from the bottom plate. After a long time, the place where the protrusion is bent will slowly become a weak point, and even leakage will occur, thereby affecting the service life of the soft-pack battery cell. Utility Model Content

[0004] One of the main purposes of the present utility model is to provide a battery module and a battery system, which aims to solve the problem that the protrusion formed by the side seal of the soft-pack battery cell in the existing battery module will interfere with the bottom plate, so the protrusion is usually folded upward in the direction away from the bottom plate, resulting in the bending place of the protrusion gradually becoming a weak point over time, and even leakage may occur, thereby affecting the service life of the soft-pack battery cell. In order to achieve the above-mentioned purpose of the utility model, the first aspect of the present utility model proposes a battery module, including a module shell and a soft-pack battery cell unit, the module shell is formed with a accommodating space inside, the bottom of the accommodating space is the bottom plate of the module shell, the soft-pack battery cell unit is arranged in the accommodating space, the bottom of the soft-pack battery cell unit is abutted against the bottom plate, the soft-pack battery cell unit has two side seals, and the bottom of each side seal is formed with a protrusion protruding out of the bottom of the soft-pack battery cell unit, and a groove for avoiding the protrusion is opened on the bottom plate.

[0005] Furthermore, the number of the soft-pack battery cell units is set to be multiple, and the multiple soft-pack battery cell units are stacked in a horizontal direction to form a battery cell stack; the protrusion on one side seal is a first protrusion, and the protrusion on the other side seal is a second protrusion, the groove used to avoid the first protrusion is a first groove, and the groove used to avoid the second protrusion is a second groove, and the number of the first grooves and the second grooves are both set to be multiple, and the multiple first grooves correspond one-to-one to the multiple first protrusions, and the multiple second grooves correspond one-to-one to the multiple second protrusions.

[0006] Furthermore, the top of the accommodating space is the cover plate of the module shell, the inner surface of the cover plate faces the top surface of the battery cell stack, and a plurality of groups of ventilation parts are opened on the cover plate, each group of ventilation parts includes a plurality of ventilation grooves, and the plurality of ventilation grooves of each group of ventilation parts are connected one by one with the plurality of the soft-pack battery cell units.

[0007] Furthermore, the top aluminum-plastic film edge seal of the soft-pack battery cell unit forms a third edge seal, the bottom aluminum-plastic film of the battery cell body has no edge seal, and a first sealing glue is provided at the sealing position of the first edge seal and the second edge seal.

[0008] Furthermore, a fireproof and heat-insulating layer is provided between two adjacent soft-pack battery core units to provide fireproof and heat-insulating protection between the two adjacent soft-pack battery core units.

[0009] Furthermore, a second sealing glue is provided between the top surface of the fireproof and heat-insulating layer and the cover plate, a cavity for accommodating the soft-pack battery cell unit is formed between two adjacent fireproof and heat-insulating layers, and a plurality of ventilation grooves of each group of ventilation parts are connected to each of the cavities in a one-to-one correspondence.

[0010] Furthermore, the fireproof and heat-insulating layer includes an aerogel layer, and the aerogel layer is used to isolate two adjacent soft-pack battery core units from each other.

[0011] Furthermore, an expandable foam is arranged between the aerogel layer and the soft-pack battery core unit.

[0012] Furthermore, the fireproof and heat-insulating layer includes an aerogel layer, and the aerogel layer is used to isolate two adjacent soft-pack battery cells from each other.

[0013] Furthermore, an expandable foam is arranged between the aerogel layer and the soft-pack battery core.

[0014] A second aspect of the present invention provides a battery system, comprising the above-mentioned battery module.

[0015] Furthermore, the battery system comprises a plurality of the battery modules stacked in a horizontal direction, and a fireproof heat-insulating pad is arranged between two adjacent battery modules.

[0016] Compared with the prior art, the battery module and battery system of the utility model have the following beneficial effects:

[0017] The battery module of the utility model has an avoidance structure on the surface of the bottom plate facing the soft-pack battery cell unit to avoid the protrusions formed by the side sealing edges of the soft-pack battery cell unit that interfere with the bottom plate, thereby avoiding the protrusions formed by the two side sealing edges from folding upward, thereby avoiding the formation of weak points where the protrusions are bent upward, and improving the service life of the soft-pack battery cell unit. At the same time, it can be understood that the battery module of the utility model has an avoidance structure without thickening the bottom plate, which can achieve the avoidance effect, save the thickness of the bottom plate, improve the module space utilization rate, and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an exploded view of the battery module of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of a battery cell stack according to an embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of a single cell involved in an embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the cover plate involved in the embodiment of the utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the battery module of the utility model;

[0023] Figure 6 A top view of the battery module of the utility model;

[0024] Figure 7 for Figure 6 Sectional view at AA in the middle;

[0025] Figure 8 for Figure 7 A schematic diagram of the enlarged structure at B in the middle;

[0026] Fig. 9 for Figure 7 Schematic diagram of the enlarged structure at C in the middle;

[0027] Fig.10 This is a schematic structural diagram of a first protrusion and a second protrusion respectively formed on two side sealing edges of a soft-pack battery cell unit according to an embodiment of the utility model;

[0028] Fig.11 This is a schematic diagram of the structure of a battery cell unit according to an embodiment of the utility model;

[0029] Fig.12 for Fig.11 Schematic diagram of the enlarged structure at D in the middle.

[0030] Reference numerals in the accompanying drawings:

[0031] 10. Battery cell stack; 101. Battery cell; 1010. Positive electrode ear; 10101. Negative electrode ear; 1011. First edge seal; 1012. Second edge seal; 10121. First protrusion; 1013. Third edge seal; 10131. Second protrusion; 1014. Battery cell body; 20. Cover plate; 201. Ventilation portion; 2011. Ventilation groove; 21. Bottom plate; 211. First groove; 212. Second groove; 22. Left side plate; 23. Right side plate; 24. Front end plate; 25. Rear end plate; 30. Aerogel layer; 31. Aluminum fins; 32. Expanded foam; 40. Bus; 50. Sampling plate. DETAILED DESCRIPTION

[0032] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] In the description of the present invention, it should be understood that the terms "width", "up", "down", "front", "back", "top", "bottom", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] Please refer to Figure 1-Figure 12 In a first aspect, the utility model proposes a battery module, including a battery cell stack 10 and a module shell, the battery cell stack 10 includes a plurality of battery cell units stacked in a horizontal direction; an accommodating space is formed inside the module shell, the battery cell stack 10 is arranged in the accommodating space, the top of the accommodating space is the cover plate 20 of the module shell, the bottom of the accommodating space is the bottom plate 21, the front end of the accommodating space is the front end plate 24, the rear end of the accommodating space is the rear end plate 25, the left side of the accommodating space is the left side plate 22, and the right side of the accommodating space is the right side plate 23, that is, the cover plate 20, the bottom plate 21, the front end plate 24, the rear end plate 25, the left side plate 22 and the right side plate 23 are folded and connected to enclose to form the accommodating space. The inner surface of the cover plate 20 faces the top surface of the battery cell stack 10, and a plurality of groups of ventilation parts 201 are provided on the cover plate 20, each group of ventilation parts 201 includes a plurality of ventilation grooves 2011, and the plurality of ventilation grooves 2011 of each group of ventilation parts 201 are in correspondence with a plurality of battery cell units. When the battery module of the utility model is in use, when a battery cell unit has thermal runaway, the high-temperature gas generated by the battery cell unit having thermal runaway will be quickly and directionally discharged through the ventilation grooves 2011 corresponding to the thermal runaway battery cell unit, effectively delaying the heat propagation time between the battery cells 101 in the battery module, avoiding the occurrence of thermal runaway in a larger range, and playing a role in delaying the thermal runaway of other battery modules in the battery system and the entire battery system.

[0037] It should be noted that, after a single battery cell unit thermally runs away, the battery module of the embodiment of the utility model can guide the high-temperature gas generated by the thermal runaway battery cell to be discharged from the battery module through the ventilation groove 2011 on the cover plate 20 corresponding to the thermal runaway battery cell unit, thereby avoiding heat accumulation in the battery module and causing more battery cells in the battery module to run away at the same time. It is suitable for battery modules using soft-pack battery cells, thereby solving the problem that the existing high-energy density soft-pack battery cell module cannot quickly and effectively eject pressure in a directional manner when thermal runaway occurs.

[0038] In one embodiment, referring to Figure 2A fireproof and heat-insulating layer is provided between two adjacent battery cells, and the fireproof and heat-insulating layer is used to insulate the two adjacent battery cells from fire and heat, so that the two adjacent battery cells are isolated from each other. In this way, when thermal runaway occurs in one of the two adjacent battery cells, the other battery cell will not be affected. Specifically, when thermal runaway occurs in one of the two adjacent battery cells, the high-temperature gas generated by the thermal runaway battery cell will be discharged through the ventilation groove 2011 corresponding to the thermal runaway battery cell, and because there is fireproof and heat-insulating isolation between the two adjacent battery cells, it is further prevented that the thermal runaway battery cell affects other battery cells, thereby further improving the safety performance of the battery module.

[0039] In one embodiment, the battery cell unit is a soft-pack battery cell unit, and the smallest unit of the soft-pack battery cell unit may be a single soft-pack battery cell 101 or two soft-pack battery cells 101 connected in parallel, which is not limited here.

[0040] In one embodiment, referring to Figure 2 , the fireproof and heat-insulating layer includes an aerogel layer 30. Optionally, the aerogel layer 30 can be attached to one side of the battery cell unit. The function of the aerogel layer 30 is to isolate the two adjacent battery cells from each other. It can be understood that because the aerogel layer 30 has strong fireproof and heat-insulating properties, the aerogel layer 30 is arranged between the two adjacent battery cells, so that the battery cells can be isolated from each other, so that the thermal runaway of one of the two adjacent battery cells will not cause damage to the other battery cell in the two adjacent battery cells. Of course, in other embodiments, the fireproof and heat-insulating layer can also include mica material, and the mica material can also have fireproof and heat-insulating properties. Therefore, for those skilled in the art, by reasonably changing the fireproof and heat-insulating layer between the two adjacent battery cells 101, it should also fall within the protection scope of the present utility model.

[0041] In one embodiment, referring to Figure 3 , an aluminum fin 31 is provided on one side of the battery cell unit, and the aluminum fin 31 on each battery cell unit is located between two adjacent battery cells. The aluminum fin 31 here plays the role of: improving the heat dissipation efficiency of the battery cell unit and preventing thermal runaway from spreading to the adjacent battery cell unit. The aerogel layer 30 can be fixed on the aluminum fin 31, refer to Figure 2An expansion foam 32 is also provided between the aerogel layer 30 and the battery cell unit. The expansion foam 32 is clamped between the aluminum fin 31 and the aerogel layer 30, that is, the expansion foam 32 is located between the aerogel layer 30 and the aluminum fin 31. The foam is used to reserve space between the battery cells to absorb the expansion of the battery cells during charging and discharging, thereby providing a lasting constant force for the expansion and contraction of the battery cells during the cycle use, reducing the stress change of the battery during use, and improving the cycle life of the battery. At the same time, the expansion foam 32 also has the functions of fire extinguishing and heat insulation.

[0042] In one embodiment, referring to Figure 3 , Figure 6 and Figure 7 The battery cell unit is a soft-pack battery cell unit. The soft-pack battery cell 101 includes a battery cell body 1014 and an aluminum-plastic film wrapping the battery cell body 1014. A pole ear is arranged on the end of the battery cell body 1014. The end of the pole ear facing away from the battery cell body 1014 is exposed outside the aluminum-plastic film. The pole ear includes a positive pole ear 1010 and a negative pole ear 10101; wherein the edge sealing of the aluminum-plastic film includes a first edge sealing 1011, a second edge sealing 1012 and a third edge sealing 1013, that is, the battery cell body unit The element has two side seals and a top seal, the two side seals are the second seal 1012 and the third seal 1013, and the top seal is the first seal 1011. By providing an avoidance structure on the surface of the bottom plate facing the soft-pack battery cell unit, it is used to avoid the protrusions formed by the side seals of the soft-pack battery cell unit that interfere with the bottom plate, and avoid the protrusions formed by the two side seals from folding upward, thereby avoiding the formation of weak points where the protrusions are bent upward, and improving the service life of the soft-pack battery cell unit. At the same time, it can be understood that the battery module of the utility model can achieve the avoidance effect by providing an avoidance structure without thickening the bottom plate, saving the thickness of the bottom plate, improving the space utilization of the module, and reducing costs.

[0043] Specifically, the first edge seal 1011 is the top aluminum-plastic film edge seal of the soft-pack battery cell 101, the top aluminum-plastic film edge seal position of the soft-pack battery cell 101 is in contact with the cover plate 20, and the bottom aluminum-plastic film of the soft-pack battery cell 101 has no edge seal, the second edge seal 1012 and the third edge seal 1013 are the aluminum-plastic film edge seals at the opposite ends of the soft-pack battery cell 101, and sealing glue is set at the sealing positions of the second edge seal 1012 and the third edge seal 1013. Exemplarily, the positive electrode ear 1010 and the negative electrode ear 10101 are respectively located at opposite ends of the battery cell body 1014. Since the positive electrode ear 1010 and the negative electrode ear 10101 need to be exposed to the outside of the aluminum-plastic film, a sealing glue is arranged between the positive electrode ear 1010 and the second sealing edge 1012, and a sealing glue is arranged between the negative electrode ear 10101 and the third sealing edge 1013 to prevent high-temperature airflow and ejecta generated when the battery cell 101 thermally runs away from the aluminum-plastic film at the position of the positive and negative electrode ears 10101. In this way, the top edge sealing position of the soft-pack battery cell 101 forms a structural weak area of ​​the soft-pack battery cell 101. When the soft-pack battery cell 101 has thermal runaway, the top edge sealing position of the soft-pack battery cell 101 becomes the only position where heat erupts, and the top edge sealing position of each soft-pack battery cell 101 corresponds to and communicates with the ventilation grooves 2011 of each group of ventilation parts 201 on the cover plate 20. Therefore, when the soft-pack battery cell 101 in the battery module has thermal runaway, the high-temperature gas can cause the structural weak area to explode rapidly, and then break through the top aluminum-plastic film of the soft-pack battery cell 101 from the top edge sealing position of the soft-pack battery cell 101 and spray out, and finally be quickly discharged to the outside of the battery module through the ventilation grooves 2011, so as to avoid heat accumulation in the battery module, thereby greatly improving the safety performance of the battery module.

[0044] Of course, in other embodiments, the positive electrode ear 1010 and the negative electrode ear 10101 can also be arranged on the same side of the battery cell body 1014, that is, the positive electrode ear 1010 and the negative electrode ear 10101 are both arranged at one end of the battery cell body 1014. Exemplarily, a first sealing glue is arranged between the positive electrode ear 1010 and the second sealing edge 1012, and a first sealing glue is also arranged at the sealing position of the negative electrode ear 10101 and the third sealing edge 1013. In this way, the top sealing edge position of the soft-pack battery cell 101 can also be made the only position where heat erupts.

[0045] In one embodiment, referring to Figure 7-10, one end of the aluminum-plastic film on the two opposite sides of the cell body 1014 is folded and connected to form the above-mentioned second edge seal 1012, so that a first protrusion 10121 is formed at the bottom of the second edge seal 1012; the bottom of the accommodating space is the bottom plate 21 of the module shell, and a first groove 211 is provided on the bottom plate 21 for avoiding the first protrusion 10121. Similarly, the other end of the aluminum-plastic film on the two opposite sides of the cell body 1014 is folded and connected to form the above-mentioned third edge seal 1013, so that a second protrusion 10131 is formed at the bottom of the third edge seal 1013, and a second groove 212 is also provided on the bottom plate 21 for avoiding the second protrusion 10131. That is, it can be understood that the protrusion on one side of the edge seal on the soft-pack battery cell 101 is the above-mentioned first protrusion 10121, the protrusion on the other side of the edge seal on the soft-pack battery cell 101 is the above-mentioned second protrusion 10131, the groove used to avoid the first protrusion 10121 on the soft-pack battery cell 101 is the first groove 211, and the groove used to avoid the second protrusion 10131 on the soft-pack battery cell 101 is the second groove 212. Of course, since there are multiple soft-pack battery cells 101, the number of first grooves 211 and second grooves 212 is also multiple, and multiple first grooves 211 correspond to multiple first protrusions 10121 one by one, and multiple second grooves 212 correspond to multiple second protrusions 10131 one by one.

[0046] It should be noted that if the above-mentioned avoidance structure is not provided on the bottom plate 21, but the protrusions at the bottom of the second edge seal 1012 and the protrusions at the bottom of the third edge seal 1013 are folded upward, the bent place will gradually become a weak point over time, and even leakage may occur, thereby affecting the service life of the soft-pack battery 101.

[0047] In one embodiment, a second sealing glue is provided between the top surface of the fireproof and heat-insulating layer and the cover plate 20, and a cavity for accommodating the soft-pack battery cell unit is formed between two adjacent fireproof and heat-insulating layers, so that the multiple ventilation grooves 2011 of each group of ventilation parts 201 are in one-to-one correspondence with each cavity. It can be seen that each ventilation groove 2011 of each group of ventilation parts 201 corresponds to each battery cell unit one-to-one, and there are fireproof and heat-insulating layers on both sides of the battery cell unit, and a second sealing glue is provided between the top surface of the fireproof and heat-insulating layer and the cover plate 20. In this way, when a battery cell unit has thermal runaway, the ejecta (such as high-temperature gas) generated by the thermal runaway battery cell unit can only be ejected from the ventilation groove 2011 corresponding to the thermal runaway battery cell unit, and will not spread to the battery cell units adjacent thereto.

[0048] In one embodiment, a thermal conductive adhesive is provided between the bottom aluminum-plastic film of the soft-pack battery cell 101 and the bottom plate 21, that is, the bottom aluminum-plastic film of the soft-pack battery cell 101 is in contact with the bottom plate 21 through the thermal conductive adhesive, so that the heat generated by the operation of the battery cell unit will be transferred to the liquid cooling plate outside the bottom plate 21 by the thermal conductive adhesive, thereby achieving a rapid cooling effect.

[0049] In one embodiment, the battery cell units of the battery cell stack 10 are stacked and connected in series to form a battery cell module to improve the energy density of the battery module; the positive pole ear 1010 of one of the two adjacent battery cell units is connected to the negative pole ear 10101 of the other of the two adjacent battery cell units through a pole ear connector to achieve the series connection between the two adjacent battery cell units. The pole ear end of the battery cell module is connected to the bus 40, and the bus 40 can be fixed in the module shell; in addition, a circuit sampling board 50 is also provided in the module shell, and the circuit sampling board 50 is connected to the bus 40 through a connecting piece, and thereby collects the voltage on the bus 40, that is, obtains the voltage of the corresponding battery cell 101, and the obtained voltage can be output to an external controller through an interface. The working principle of the circuit sampling board 50 belongs to the prior art and will not be repeated here.

[0050] The second aspect of the utility model provides a battery system, including a battery module of the utility model, wherein the battery module has multiple battery modules, the multiple battery modules are stacked in the horizontal direction, and a fireproof heat insulation pad is arranged between two adjacent battery modules. The fireproof heat insulation pad can play a thermal protection role, so that when the battery module has thermal runaway, the heat is isolated by the heat insulation pad to prevent heat conduction to the adjacent battery module, thereby preventing the high-temperature smoke from the battery module runaway from continuously impacting and heating other adjacent battery modules.

[0051] In summary, when a battery module experiences thermal runaway, the high-temperature gas in the thermal runaway battery module will be discharged to the ventilation groove 2011 through the set path, and the thermal insulation pad can prevent heat from being conducted to adjacent battery modules. In this way, the high-temperature smoke generated by the thermal runaway battery module can be prevented from continuously impacting and heating other adjacent battery modules, thereby improving the safety performance of the battery system.

[0052] 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 specification 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 module, characterized in that: The invention comprises a module shell and a soft-pack battery cell unit, wherein an accommodating space is formed inside the module shell, the bottom of the accommodating space is the bottom plate of the module shell, the soft-pack battery cell unit is arranged in the accommodating space, the bottom of the soft-pack battery cell unit is abutted against the bottom plate, the soft-pack battery cell unit has sealed edges on both sides, the bottom of each side sealed edge is formed with a protruding portion protruding out of the bottom of the soft-pack battery cell unit, and the bottom plate is provided with a groove for avoiding the protruding portion.

2. The battery module according to claim 1, characterized in that: The number of the soft-pack battery cell units is multiple, and the multiple soft-pack battery cell units are stacked in a horizontal direction to form a battery cell stack; the protrusion on one side seal is a first protrusion, and the protrusion on the other side seal is a second protrusion, the groove used to avoid the first protrusion is a first groove, and the groove used to avoid the second protrusion is a second groove, and the number of the first grooves and the second grooves are both multiple, and the multiple first grooves correspond one-to-one to the multiple first protrusions, and the multiple second grooves correspond one-to-one to the multiple second protrusions.

3. The battery module according to claim 2, characterized in that: The top of the accommodating space is the cover plate of the module shell, the inner surface of the cover plate faces the top surface of the battery cell stack, and a plurality of ventilation parts are opened on the cover plate, each group of ventilation parts includes a plurality of ventilation grooves, and the plurality of ventilation grooves of each group of ventilation parts are connected one by one with the plurality of the soft-pack battery cell units.

4. The battery module according to claim 3, characterized in that: The soft-pack battery cell unit also has a top edge seal, the bottom of the soft-pack battery cell unit has no edge seal, and the first sealing glue is arranged at the sealing positions of the two side edge seals.

5. The battery module according to claim 4, characterized in that: A fireproof and heat-insulating layer is arranged between two adjacent soft-pack battery core units to provide fireproof and heat-insulating protection between the two adjacent soft-pack battery core units.

6. The battery module according to claim 5, characterized in that: A second sealing glue is arranged between the top surface of the fireproof and heat-insulating layer and the cover plate, a cavity for accommodating the soft-pack battery cell unit is formed between two adjacent fireproof and heat-insulating layers, and a plurality of ventilation grooves of each group of ventilation parts are connected to each of the cavities in a one-to-one correspondence.

7. The battery module according to claim 6, characterized in that: The fireproof and heat-insulating layer comprises an aerogel layer, and the aerogel layer is used to isolate two adjacent soft-pack battery core units from each other.

8. The battery module according to claim 7, characterized in that: Expandable foam is also arranged between the aerogel layer and the soft-pack battery core unit.

9. A battery system, characterized in that: A battery module comprising any one of claims 1-8.

10. The battery system according to claim 9, characterized in that: It comprises a plurality of battery modules stacked in a horizontal direction, and a fireproof heat-insulating pad is arranged between two adjacent battery modules.

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