Battery cell module and battery pack

Abstract

The utility model relates to the technical field of battery protection, and discloses a battery cell module and a battery pack. The battery module comprises a plurality of battery cells, and the tops of the battery cells are respectively provided with an anti-explosion valve; the fire extinguishing cover covers the tops of the battery cells, the fire extinguishing cover is provided with a containing cavity, and a fire extinguishing agent is arranged in the containing cavity; a fire extinguishing opening communicating with the containing cavity is formed in the side, facing the anti-explosion valve, of the fire extinguishing cover and faces the anti-explosion valve, and a sealing film is arranged at the fire extinguishing opening. According to the utility model, the use amount of heat insulation materials between the battery cells can be reduced, the weight and the manufacturing cost of the battery pack are reduced, the energy density of the battery cell module and the battery pack is improved, the time of eruption of high-temperature gas and flame caused by thermal runaway of the battery cells can be effectively shortened, and heat spreading between adjacent battery cells is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery protection technical field, concretely relates to a kind of battery cell module and battery pack. BACKGROUND

[0002] The current battery pack thermal runaway protection scheme usually includes the following measures: first, place aerogel felt or other high-temperature-resistant insulation materials between the battery cells to prevent heat spread between the battery cells;Second, install mica plate or epoxy plate above the explosion-proof valve of the battery cell to prevent high-temperature gas and other high-temperature eruption from the explosion-proof valve of the battery cell when the battery cell overheats, igniting the battery pack upper cover and other high and low voltage electrical devices.

[0003] However, the above protection scheme, although it improves the safety of the battery pack, also has some negative effects. First, because of the additional addition of insulation materials, the weight and manufacturing cost of the battery pack will increase. Second, the insulation materials will occupy part of the installation space inside the battery pack, which will result in a decrease in the effective capacity of the battery pack and a decrease in the energy density of the battery pack. SUMMARY

[0004] Therefore, the utility model provides a battery cell module and a battery pack to solve the problem of increasing the weight, manufacturing cost and energy density of the battery pack in the related art.

[0005] In a first aspect, the utility model provides a battery cell module, comprising:

[0006] A plurality of battery cells, each having an explosion-proof valve at the top;

[0007] A fire extinguishing cover is provided on the top of the plurality of battery cells, and the fire extinguishing cover has a receiving cavity with a fire extinguishing agent inside. The side of the fire extinguishing cover facing the explosion-proof valve is provided with a fire extinguishing port connected to the receiving cavity, and the fire extinguishing port is arranged towards the explosion-proof valves, and a sealing film is provided at the fire extinguishing port.

[0008] Advantages: Compared with the technical solution described in the background art, the fire extinguishing cover of the utility model can not only serve as the top cover of the battery module but also has the function of extinguishing fire, and does not need to occupy the space between adjacent battery cells, so more space can be reserved for accommodating battery cells, thereby effectively improving the energy density of the battery cell module and the battery pack. In addition, since no insulation materials are needed between adjacent battery cells, the weight and manufacturing cost of the battery pack can also be reduced.

[0009] Further, from the final effect of the technical solution, the technical solution in the background art is more to reduce the heat transfer between adjacent battery cells, so it cannot shorten the time of the battery cell in the thermal runaway state. In contrast, the technical solution of the utility model not only can prevent the thermal spread between adjacent battery cells, but also can reduce the time of the battery cell thermal runaway spewing high-temperature gas and flame, thereby effectively shortening the time of the battery cell in the thermal runaway state.

[0010] In an alternative embodiment, the fire extinguishing cover is further provided with an annular flange arranged around the fire extinguishing port and extending towards the explosion-proof valve, and an end of the annular flange away from the fire extinguishing port is in abutment with the explosion-proof valve.

[0011] Beneficial effects: The annular flange connects the fire extinguishing port and the explosion-proof valve, so that the high-temperature gas and flame generated by the explosion-proof valve can be guided by the annular flange to accurately contact and damage the sealing film, thereby ensuring that the fire extinguishing agent can be released in time to achieve rapid fire extinguishing of the explosion-proof valve and shorten the time of the battery cell in the thermal runaway state. In addition, the end of the annular flange away from the fire extinguishing port is in abutment with the explosion-proof valve, which can maximize the restriction of high-temperature gas, flame and fire extinguishing agent within the annular flange. In this way, not only can the interference with adjacent normal battery cells be reduced, but also the fire extinguishing agent can fully contact the high-temperature gas and flame to quickly reduce the temperature when the battery cell is in thermal runaway.

[0012] In an alternative embodiment, a plurality of battery cells are arranged side by side, the fire extinguishing cover covers the top of the battery cells, and the bottom of the fire extinguishing cover avoids bonding with the top of the battery cell avoiding the explosion-proof valve.

[0013] Beneficial effects: The plurality of battery cells arranged side by side can maximize the use of the internal space of the battery cell module, thereby effectively improving the energy density of the battery cell module and the battery pack. Secondly, covering the fire extinguishing cover on the top of the plurality of battery cells can reduce the probability of damage to the top structure of the battery cell. In this way, the fire extinguishing cover not only has the function of fire extinguishing, but also has the function of protection. Further, bonding the fire extinguishing cover with the top of the battery cell can make the fire extinguishing cover more stably fixed on the top of the battery cell, reducing the possibility of relative position change between the fire extinguishing port and the explosion-proof valve due to vibration or impact during transportation, installation and use. In turn, when the battery cell is in thermal runaway, the fire extinguishing agent can be quickly and effectively sprayed out of the fire extinguishing port onto the explosion-proof valve to ensure the best fire extinguishing effect. In addition, compared with other fixing methods, the bonding operation is simple, the cost is lower, and it can also provide better connection strength.

[0014] In an alternative embodiment, the fire extinguishing port is a plurality of fire extinguishing ports, and a plurality of fire extinguishing ports are arranged one by one corresponding to a plurality of explosion-proof valves.

[0015] Beneficial effects: By setting multiple fire extinguishing ports and corresponding multiple explosion-proof valves, precise fire extinguishing can be achieved, and the influence of fire extinguishing agent on other normal battery cells can be avoided.

[0016] In an alternative embodiment, the fire extinguishing cover comprises an upper cover plate and a lower cover plate, the accommodation cavity is formed between the upper cover plate and the lower cover plate, and the fire extinguishing port is arranged on the lower cover plate.

[0017] Beneficial effects: The cavity structure formed by the upper cover plate and the lower cover plate has good structural strength, thereby better protecting the fire extinguishing agent. In addition, by arranging the fire extinguishing port on the lower cover plate, precise correspondence between the fire extinguishing port and the explosion-proof valve can be achieved during assembly, reducing assembly difficulty while ensuring the effectiveness of subsequent fire extinguishing.

[0018] In an alternative embodiment, the upper cover plate comprises a cover plate body with a groove and a first flange arranged on the circumferential side of the groove wall, the first flange is connected with the lower cover plate, and the accommodation cavity is formed between the cover plate body and the lower cover plate.

[0019] Beneficial effects: By arranging the first flange on the circumferential side of the groove wall, not only the structural strength of the upper cover plate can be increased to improve the stability of the overall structure, but also the contact area between the upper cover plate and the lower cover plate can be increased to improve the sealing effect of the accommodation cavity and the connection stability between the upper cover plate and the lower cover plate.

[0020] In an alternative embodiment, the circumferential side of the lower cover plate extends downward to form a second flange, the second flange surrounds the circumferential side of the plurality of battery cells and is bonded to the plurality of battery cells.

[0021] Beneficial effects: By arranging the second flange on the circumferential side of the lower cover plate, not only the structural strength of the lower cover plate can be increased to improve the stability of the overall structure, but also the contact area between the lower cover plate and the plurality of battery cells can be increased to improve the connection stability between the fire extinguishing cover and the plurality of battery cells, ensuring the effectiveness of subsequent fire extinguishing.

[0022] In an alternative embodiment, the top of the battery cell is further provided with a pole, the poles of two adjacent battery cells are connected through a busbar, and the bottom of the fire extinguishing cover avoiding the fire extinguishing port is bonded to the busbar.

[0023] Beneficial effects: the fire extinguishing cover is bonded with the busbar, so that the fire extinguishing cover can be more stably fixed on the top of the battery cell, reducing the possibility of relative position change of the fire extinguishing port and the explosion-proof valve due to vibration or impact during transportation, installation and use. Secondly, since the busbar will rise in temperature during current transmission, bonding the fire extinguishing cover with the busbar can cool the busbar with the fire extinguishing agent in the containing cavity, ensuring that the temperature is always within a reasonable range. In addition, the fire extinguishing cover arranged above the busbar can also play an insulating protection role.

[0024] In an alternative embodiment, the fire extinguishing cover is provided with a liquid injection port in communication with the containing cavity.

[0025] Beneficial effects: by providing a liquid injection port on the fire extinguishing cover, the step of filling the fire extinguishing agent into the containing cavity can be simplified, reducing the complexity of the operation.

[0026] In a second aspect, the utility model also provides a battery pack, comprising: a shell and at least one above-mentioned battery cell module, the battery cell module is installed in the shell.

[0027] Beneficial effects: by using the above-mentioned battery cell module, on the one hand, the weight and manufacturing cost of the battery pack can be reduced; on the other hand, the energy density of the battery pack can also be improved. Further, since the fire extinguishing agent in the battery cell module can effectively reduce the temperature of the battery cell thermal runaway and shorten the thermal runaway time of the battery cell, the use safety of the battery pack can be effectively improved. In addition, the battery pack of the utility model has all the advantages of the above-mentioned battery cell, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0029] Figure 1 It is a structural schematic view of a battery cell module of the utility model embodiment.

[0030] Figure 2 It is an explosion schematic view of the battery cell module shown in the figure. Figure 1

[0031] It is a structural schematic view of the fire extinguishing cover shown in the figure. Figure 3 Figure 1

[0032] Figure 4 Figure 3 ​​​A-A direction cross-sectional view schematic diagram;

[0033] Figure 5 For Figure 3 The bottom view schematic diagram of the fire extinguishing cover.

[0034] Reference signs:

[0035] 1, the cell; 101, the explosion-proof valve; 102, the pole; 2, the fire extinguishing cover; 201, the accommodating cavity; 202, the fire extinguishing port; 2021, the annular flange; 203, the sealing film; 204, the upper cover plate; 2041, the cover plate body; 2042, the recess; 2043, the first flange; 205, the lower cover plate; 2051, the second flange; 206, the liquid injection port; 3, the busbar. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0037] In order to solve the problems that the thermal runaway protection scheme of the battery pack in the related art increases the self weight of the battery pack, the manufacturing cost, and reduces the energy density of the battery pack, the utility model provides a kind of cell module and battery pack.

[0038] The embodiments of the utility model will be described below in conjunction with Figures 1 to 5 .

[0039] According to the embodiments of the utility model, on the one hand, as Figure 1 , Figure 2 and Figure 5 indicate, a kind of cell module is provided, comprising: multiple cells 1 and fire extinguishing cover 2.

[0040] Specifically, multiple cells 1 top is separately provided with explosion-proof valve 101;Fire extinguishing cover 2 cover is set to the top of multiple cells 1, fire extinguishing cover 2 is provided with accommodating cavity 201, accommodating cavity 201 is provided with fire extinguishing agent;Fire extinguishing cover 2 towards the side of explosion-proof valve 101 is provided with the fire extinguishing port 202 that is communicated with accommodating cavity 201, fire extinguishing port 202 is set towards explosion-proof valve 101, and sealing film 203 is provided at fire extinguishing port 202.

[0041] The fire extinguishing cover 2 of the embodiment functions as a battery module top cover while having a fire extinguishing effect, and does not need to occupy the space between adjacent battery cells 1, so more space for accommodating battery cells 1 can be reserved, thereby effectively improving the energy density of the battery cell module and the battery pack. In addition, since no thermal insulation material needs to be arranged between adjacent battery cells 1, the weight and manufacturing cost of the battery pack can also be reduced.

[0042] Further, from the final effect of the technical solution, the technical solution in the background art is more to reduce the heat transfer between adjacent battery cells 1, so it cannot shorten the time of the battery cell 1 in the thermal runaway state. In contrast, the technical solution of the embodiment not only prevents heat spread between adjacent battery cells 1, but also reduces the time of the battery cell 1 in the thermal runaway state. Specifically, the working principle of the technical solution of the embodiment is as follows:

[0043] When the battery cell 1 is in thermal runaway, the high-temperature gas and flame sprayed by the explosion-proof valve 101 can break through the sealing film 203 at the fire extinguishing port 202, so that the fire extinguishing agent can spray the explosion-proof valve 101 to reduce the temperature of the battery cell 1 in thermal runaway, reduce the time of the battery cell 1 in the thermal runaway state, and prevent heat spread between adjacent battery cells 1. Secondly, the fire extinguishing cover 2 is arranged on the top of the battery cell 1, so that the fire extinguishing agent can be released at the fire extinguishing port 202 under the condition of the battery cell 1 in the thermal runaway state and fully contact the high-temperature gas and flame sprayed by the explosion-proof valve 101, thereby ensuring the fire extinguishing effect.

[0044] It should be noted that the type of fire extinguishing agent in the embodiment can be a liquid fire extinguishing agent, a gas fire extinguishing agent, or a powder fire extinguishing agent. For example, in a specific embodiment, an insulating liquid fire extinguishing agent is arranged in the containing cavity 201 of the fire extinguishing cover 2. In this way, even if the fire extinguishing agent flows into the battery pack, there will be no short circuit problem of electrical connection. In addition, in order to improve the fire extinguishing effect of the fire extinguishing agent, the fire extinguishing agent with a certain pressure can be stored in the containing cavity 201.

[0045] In addition, in order to ensure that the high-temperature gas and flame sprayed by the explosion-proof valve 101 can break through the sealing film 203 in the thermal runaway state, a sealing film 203 with a lower melting point and a thinner thickness can be selected. For example, in a specific embodiment, the melting point of the sealing film 203 is 150-300℃, and the thickness of the sealing film 203 is 0.1-0.5mm. Further, in order to avoid the short circuit problem caused by the fragments of the damaged sealing film 203, the sealing film 203 in the embodiment can also be selected to be an insulating film.

[0046] According to an embodiment of the present application, Figure 4 and Figure 5As shown, the fire extinguishing cover 2 is further provided with an annular flange 2021 surrounding the fire extinguishing port 202 and extending towards the explosion-proof valve 101, and an end of the annular flange 2021 away from the fire extinguishing port 202 abuts against the explosion-proof valve 101. The annular flange 2021 is used to connect the fire extinguishing port 202 and the explosion-proof valve 101 in communication, so that the high-temperature gas and flame generated by the explosion-proof valve 101 can be guided by the annular flange 2021 to accurately contact and damage the sealing film 203, thereby ensuring that the fire extinguishing agent can be released in time to achieve rapid fire extinguishing of the explosion-proof valve 101 and shorten the time of the battery cell 1 in a thermal runaway state.

[0047] In addition, the annular flange 2021 abutting against the explosion-proof valve 101 at the end away from the fire extinguishing port 202 can maximize the restriction of high-temperature gas, flame and fire extinguishing agent within the annular flange 2021, so as to not only reduce the interference to the adjacent normal battery cell 1, but also allow the fire extinguishing agent to fully contact the high-temperature gas and flame to quickly reduce the temperature when the battery cell 1 is in a thermal runaway state.

[0048] According to an embodiment of the present application, as shown in Figure 2 The plurality of battery cells 1 are arranged side by side, the fire extinguishing cover 2 covers the top of the plurality of battery cells 1, and the bottom of the fire extinguishing cover 2 avoiding the fire extinguishing port 202 is bonded to the top of the battery cell 1 avoiding the explosion-proof valve 101. Arranging the plurality of battery cells 1 side by side is beneficial to maximize the use of the internal space of the battery cell module, thereby effectively improving the energy density of the battery cell module and the battery pack. Secondly, covering the fire extinguishing cover 2 on the top of the plurality of battery cells 1 can reduce the probability of damage to the structure at the top of the battery cell 1. In this way, the fire extinguishing cover 2 not only has the function of fire extinguishing, but also has the function of protection.

[0049] Further, bonding the fire extinguishing cover 2 to the top of the battery cell 1 can more stably fix the fire extinguishing cover 2 on the top of the battery cell 1, reducing the possibility of the relative position of the fire extinguishing port 202 and the explosion-proof valve 101 changing due to vibration or impact during transportation, installation and use. In turn, when the battery cell 1 is in a thermal runaway state, the fire extinguishing agent can be quickly and effectively sprayed out of the fire extinguishing port 202 onto the explosion-proof valve 101, ensuring the best fire extinguishing effect. In addition, compared with other fixing methods, the bonding operation is simple, the cost is lower, and at the same time, it can also provide better connection strength.

[0050] According to an embodiment of the present application, as shown in Figure 5As shown, the fire extinguishing ports 202 are multiple, and the multiple fire extinguishing ports 202 are arranged one-to-one with the multiple explosion-proof valves 101. By arranging the multiple fire extinguishing ports 202 and arranging the multiple fire extinguishing ports 202 one-to-one with the multiple explosion-proof valves 101, precise fire extinguishing can be achieved, and the influence of the fire extinguishing agent on other normal battery cells 1 can also be avoided. It can be understood that, since the multiple battery cells 1 are arranged side by side, the fire extinguishing ports 202 on the fire extinguishing cover 2 can be arranged at intervals along the thickness direction of the battery cell 1. Among them, the thickness direction of the battery cell 1 is consistent with the direction shown in the figure. Figure 2

[0051] According to an embodiment of the present application, as shown in the figure, Figures 2 to 4 The fire extinguishing cover 2 includes an upper cover plate 204 and a lower cover plate 205, and the upper cover plate 204 and the lower cover plate 205 form a containing cavity 201, and the fire extinguishing port 202 is arranged on the lower cover plate 205. The cavity structure formed by the upper cover plate 204 and the lower cover plate 205 has good structural strength, so as to better protect the fire extinguishing agent. In addition, the fire extinguishing port 202 is arranged on the lower cover plate 205, which facilitates precise correspondence between the fire extinguishing port 202 and the explosion-proof valve 101 during assembly, reduces the assembly difficulty, and ensures the effectiveness of subsequent fire extinguishing.

[0052] According to an embodiment of the present application, as shown in the figure, Figure 4 The upper cover plate 204 includes a cover plate body 2041 having a groove 2042 and a first flange 2043 arranged on the groove wall side of the groove 2042, and the first flange 2043 is connected with the lower cover plate 205. The cover plate body 2041 and the lower cover plate 205 form a containing cavity 201. By arranging the first flange 2043 on the groove wall side of the groove 2042, not only the structural strength of the upper cover plate 204 can be increased, the stability of the overall structure can be improved, but also the contact area between the upper cover plate 204 and the lower cover plate 205 can be increased, the sealing effect of the containing cavity 201 can be improved, and the connection stability between the upper cover plate 204 and the lower cover plate 205 can be improved.

[0053] According to an embodiment of the present application, as shown in the figure, Figures 2 to 5 The side of the lower cover plate 205 extends downward to form a second flange 2051, and the second flange 2051 is arranged around the side of the multiple battery cells 1 and is bonded with the multiple battery cells 1. By arranging the second flange 2051 on the side of the lower cover plate 205, not only the structural strength of the lower cover plate 205 can be increased, the stability of the overall structure can be improved, but also the contact area between the lower cover plate 205 and the multiple battery cells 1 can be increased, the connection stability between the fire extinguishing cover 2 and the multiple battery cells 1 can be improved, and the effectiveness of subsequent fire extinguishing can be ensured.

[0054] According to an embodiment of the present application, as shown in the figure, Figure 2 ​As shown, the top of the battery cell 1 is also provided with a pole 102, and the poles 102 of two adjacent battery cells 1 are connected through the busbar 3. The bottom of the fire extinguishing cover 2 avoiding the fire extinguishing port 202 is bonded with the busbar 3. The bonding of the fire extinguishing cover 2 and the busbar 3 can make the fire extinguishing cover 2 more stably fixed on the top of the battery cell 1, and reduce the possibility of the relative position between the fire extinguishing port 202 and the explosion-proof valve 101 changed due to vibration or impact during transportation, installation and use. Secondly, since the temperature of the busbar 3 will rise during the transmission of current, the bonding of the fire extinguishing cover 2 and the busbar 3 can make the fire extinguishing agent in the containing cavity 201 cool the busbar 3, so as to ensure that the temperature of the busbar 3 is always within a reasonable range. In addition, the fire extinguishing cover 2 arranged above the busbar 3 can also play an insulating protection role. It can be understood that, in order to further improve the heat dissipation effect of the busbar, the fire extinguishing cover 2 and the busbar 3 can be bonded together by using heat-conducting glue.

[0055] It should be noted that, since the lower cover plate 205 needs to be connected with the busbar, in order to avoid the short circuit problem between the busbar and the fire extinguishing cover 2, the material of the lower cover plate 205 can be high-temperature-resistant plastic. In addition, since the lower cover plate 205 isolates the upper cover plate 204 from the busbar, the material of the upper cover plate 204 can be aluminum plate or steel plate, and the upper cover plate 204 can be prepared into a shape by stamping.

[0056] According to an embodiment of the present application, Figures 1 to 3 As shown, the fire extinguishing cover 2 is provided with a liquid injection port 206 communicating with the containing cavity 201. By arranging the liquid injection port 206 on the fire extinguishing cover 2, the step of filling the fire extinguishing agent into the containing cavity 201 can be simplified, and the complexity of operation can be reduced. It can be understood that the liquid injection port 206 in the present embodiment can be arranged on the upper cover plate 204 or the lower cover plate 205, or arranged on both the upper cover plate 204 and the lower cover plate 205. The specific adjustment can be made according to the design requirement, and the present application does not make specific limitation.

[0057] According to the embodiment of the present application, on the other hand, a battery pack is also provided, which comprises a shell and at least one above-mentioned battery cell module, and the battery cell module is installed in the shell. By adopting the above-mentioned battery cell module, on the one hand, the weight and manufacturing cost of the battery pack can be reduced; on the other hand, the energy density of the battery pack can also be improved. Further, since the fire extinguishing agent in the battery cell module can effectively reduce the temperature of the thermal runaway of the battery cell 1 and shorten the thermal runaway time of the battery cell 1, the use safety of the battery pack can be effectively improved. In addition, the battery pack of the present embodiment has all the advantages of the above-mentioned battery cell 1, which will not be repeated here.

[0058] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope of the appended claims.

Claims

1. An electric cell module, characterized by comprising: The application relates to a battery module. The battery module comprises a plurality of battery cells, each of which is provided with an explosion-proof valve at the top; The battery module further comprises a fire extinguishing cover, which is arranged on the top of the plurality of battery cells and is provided with a containing cavity, wherein the containing cavity is provided with a fire extinguishing agent; one side of the fire extinguishing cover, which faces the explosion-proof valve, is provided with a fire extinguishing port which is in communication with the containing cavity, the fire extinguishing port faces the plurality of explosion-proof valves, and a sealing film is arranged at the fire extinguishing port.

2. The battery cell module of claim 1, wherein, The fire extinguishing cover is further provided with an annular flange which surrounds the fire extinguishing port and extends towards the explosion-proof valve, and one end of the annular flange, which is away from the fire extinguishing port, is in abutment with the explosion-proof valve.

3. The battery cell module of claim 1, wherein, The plurality of battery cells are arranged side by side, the fire extinguishing cover covers the top of the plurality of battery cells, and the bottom of the fire extinguishing cover, which avoids the fire extinguishing port, is bonded to the top of the battery cells, which avoids the explosion-proof valve.

4. The battery cell module of claim 1, wherein, The fire extinguishing port is provided in a plurality of forms, and the plurality of fire extinguishing ports are arranged in one-to-one correspondence with the plurality of explosion-proof valves.

5. The battery cell module of claim 1, wherein, The fire extinguishing cover comprises an upper cover plate and a lower cover plate, the containing cavity is formed between the upper cover plate and the lower cover plate, and the fire extinguishing port is arranged on the lower cover plate.

6. The battery cell module of claim 5, wherein, The upper cover plate comprises a cover plate body provided with a groove and a first flange arranged on the circumferential side of the groove wall of the groove, the first flange is connected with the lower cover plate, and the containing cavity is formed between the cover plate body and the lower cover plate.

7. The battery cell module of claim 5, wherein, The circumferential side of the lower cover plate extends downward to form a second flange, the second flange surrounds the circumferential side of the plurality of battery cells and is bonded to the plurality of battery cells.

8. The battery cell module of any one of claims 1 to 7, wherein, The top of the battery cell is further provided with a pole, the poles of two adjacent battery cells are connected through a busbar, and the bottom of the fire extinguishing cover, which avoids the fire extinguishing port, is bonded to the busbar.

9. The battery cell module of any one of claims 1-7, wherein, The fire extinguishing cover is provided with a liquid injection port which is in communication with the containing cavity.

10. A battery pack, characterized by, The application further relates to a battery pack, which comprises a shell and at least one battery cell module as claimed in any one of claims 1 to 9, and the battery cell module is arranged in the shell.

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