Battery case, single battery, battery pack, and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery case, a single battery, a battery pack and a battery pack. The battery shell comprises a shell body, a top cover and a melting structure, the shell body is provided with a first opening and a second opening, the first opening is located at the top of the shell body, the top cover is installed at the first opening, the second opening is located at the bottom of the shell body and / or the side part facing the external environment, and the melting structure is installed at the second opening. And when the temperature in the battery rises to a temperature threshold value, the melting structure can melt and open the second opening. According to the arrangement, a common explosion-proof valve assembly is replaced by the melting structure of the battery shell, and under the action of the melting structure, the air pressure and the temperature in the battery shell can be reduced to be within a safe range value, so that the use safety of the electrode assembly is ensured, explosion is avoided, and other accessories in a vehicle are not ignited; therefore, time for people to get out of danger is provided, potential hazards cannot be directly caused to a user, and the safety of the user can be guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery shell, single battery, battery pack and battery package. BACKGROUND

[0002] The structure of the existing battery shell usually includes a cover plate and a shell, and an explosion-proof valve assembly is usually arranged on the cover plate or the shell. The main function of the explosion-proof valve assembly is to timely open when a side reaction occurs in the battery (for example, due to overcharging, short circuit, or external high temperature, etc.), so as to prevent the battery from exploding.

[0003] At present, the explosion-proof valve assembly, the liquid injection hole and the pole are usually fixed on the cover plate. When the battery is vertically placed after being grouped, the flame can be sprayed into the car interior after the battery catches fire, thereby endangering personal safety. If the battery is placed upside down, the tab of the battery is easy to be inserted into the pole after being placed upside down, thereby increasing the use risk and reducing the safety of the battery.

[0004] Based on the above, there is an urgent need for a battery shell, single battery, battery pack and battery package to solve the problems existing in the prior art. UTILITY MODEL CONTENTS

[0005] The first purpose of the utility model is to provide a battery shell, which can improve the safety of the battery and reduce the potential risk to the user, thereby protecting the safety of the user.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The battery shell comprises a shell, a top cover and a melting structure. The shell has a first opening and a second opening. The first opening is located at the top of the shell, and the top cover is installed on the first opening. The second opening is located at the bottom of the shell and / or the side facing the external environment. The melting structure is installed on the second opening. The melting structure is arranged to melt and open the second opening when the temperature in the shell rises to a temperature threshold.

[0008] Preferably, the side of the melting structure facing the external environment is flush with the end of the second opening facing the external environment.

[0009] Preferably, the melting structure comprises a first melting part and a second melting part. The diameter of the first melting part is smaller than the diameter of the second melting part. The first melting part is embedded in the second opening, and the second melting part is attached to the inner side wall of the shell.

[0010] Preferably, the inner side wall of the shell is provided with a groove, and the second melting part is arranged in the groove.

[0011] Preferably, the melting structure comprises any one of PE hot-melt part, PP hot-melt part, PET hot-melt part, PPS hot-melt part, PTFE hot-melt part and PS hot-melt part.

[0012] Preferably, the structural strength of the first melting part is less than that of the second melting part.

[0013] Preferably, the second opening and the melting structure are correspondingly provided with a plurality of openings.

[0014] The battery shell replaces the commonly used explosion-proof valve assembly with the melting structure, so that the melting structure can melt when the temperature inside the battery shell rises, thereby releasing the gas pressure and heat in the battery shell, reducing the gas pressure and temperature in the battery shell to a safe range, ensuring the safe use of the electrode assembly and preventing explosion.

[0015] The second purpose of the utility model is to provide a single battery, which can improve the use safety and protect the safety of users.

[0016] To achieve the purpose, the utility model adopts the following technical scheme:

[0017] The single battery comprises an electrode assembly and the battery shell, the battery shell has a containing cavity, the electrode assembly is located in the containing cavity, and the pole column of the battery shell is conductively connected to the tab group of the electrode assembly.

[0018] The single battery provided by the utility model has the advantages that the single battery uses the above-mentioned battery shell, compared with the single battery provided by the prior art, explosion does not occur, the use safety is high, potential harm to users is avoided, and the safety of users is protected.

[0019] The third purpose of the utility model is to provide a battery pack, which can reduce the possibility of fire and explosion and reduce harm to users.

[0020] To achieve the purpose, the utility model adopts the following technical scheme:

[0021] The battery pack comprises a plurality of single batteries, and the plurality of single batteries are arranged along a preset direction.

[0022] The battery pack has the advantages that: the battery pack is provided with the single battery, the melting structure is arranged on the single battery, the possibility of fire and explosion of the battery pack is reduced, the personal safety of the user is not endangered, and thus the battery pack has high market application value and practicability.

[0023] A fourth object of the present application is to provide a battery pack which can reduce the possibility of fire and explosion and reduce the harm to the user.

[0024] To achieve the above object, the present application adopts the following technical scheme.

[0025] The battery pack comprises a box body and the battery pack.

[0026] The battery pack has the advantages that: the battery pack is provided with the single battery, the melting structure is arranged on the single battery, the possibility of fire and explosion of the battery pack is reduced, the personal safety of the user is not endangered, and thus the battery pack has high market application value and practicability. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic view of a battery shell provided by the present application;

[0028] Figure 2 is a structural schematic view of a top cover provided by the present application;

[0029] Figure 3 is a bottom view of a shell provided by the present application;

[0030] Figure 4 is a structural schematic view of a melting structure provided by the present application;

[0031] Figure 5 is an assembly view of the battery pack in a vehicle provided by the present application.

[0032] In the drawings:

[0033] 1, shell; 11, second opening; 12, groove;

[0034] 21, cover plate; 22, pole; 23, lower plastic; 24, liquid injection hole;

[0035] 3, melting structure; 31, first melting part; 32, second melting part;

[0036] 100, single battery; 200, bottom plate. DETAILED DESCRIPTION

[0037] The utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings, not all the structures.

[0038] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] In the description of the embodiment, the terms "upper", "lower", "right", "left" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation of the utility model. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.

[0041] At present, the explosion-proof valve assembly and the pole 22 in the battery are usually fixed on the cover plate 21, and when the battery is vertically placed after being grouped, the flame can be sprayed into the automobile interior after the battery catches fire, thereby endangering personal safety. If the battery is placed upside down, the pole lug of the battery is easy to be inserted into the pole after being inverted, thereby increasing the use risk and reducing the use safety of the battery.

[0042] The embodiment provides a battery shell, which is mainly applied in a vehicle, reduces the influence on personal safety after the battery catches fire, reduces the use risk of the battery, and improves the use safety.

[0043] Specifically, asFigure 1 、 Figure 2 As shown in FIG. 1, the battery shell provided by the embodiment is of a square structure, comprising a shell 1, a top cover and a melting structure 3. The shell 1 is internally provided with an accommodating cavity for accommodating an electrode assembly, and a first opening and a second opening 11 are formed at two ends of the shell 1, wherein the first opening is located at the top of the shell 1, and the second opening 11 is located at the bottom of the shell 1, and both the first opening and the second opening 11 are communicated with the accommodating cavity. The top cover comprises a cover plate 21, a pole 22 and a lower plastic 23, wherein the cover plate 21 is sealingly arranged at the first opening, the pole 22 and the lower plastic 23 are both mounted on the cover plate 21, the pole 22 is usually provided with two, one of which is electrically connected to the positive lug group of the electrode assembly, and the other is electrically connected to the negative lug group of the electrode assembly, and the lower plastic 23 is overlapped at the first opening for insulating the cover plate 21 and the electrode assembly to ensure safety. The melting structure 3 is installed at the second opening 11, and the melting structure 3 is arranged to be able to melt and open the second opening 11 when the temperature in the shell 1 rises to a temperature threshold, so as to communicate the inside and outside of the battery.

[0044] Further, the cover plate 21 is further provided with a liquid injection hole 24 for injecting electrolyte into the battery shell, which can also be used for pre-charging negative pressure exhaust, discharging moisture of the electrode assembly and the like.

[0045] In the above arrangement, the battery shell replaces the commonly used explosion-proof valve assembly with the melting structure 3, so that when the temperature inside the battery shell rises, the melting structure 3 can melt, and since the air pressure in the battery shell will also rise at this time, the melted melting structure 3 will be squeezed out of the battery shell, thereby releasing the air pressure and heat in the battery shell, so that the air pressure and temperature in the battery shell are reduced to a safe range. In addition, since the melting structure 3 is arranged at the bottom of the battery shell, the gas and heat will be directly sprayed on the chassis 200 of the vehicle, and will not ignite other accessories inside the vehicle, thereby providing time for the person to escape from danger. Compared with the arrangement of the explosion-proof valve, the melting structure 3 provided by the embodiment not only ensures the safe use of the electrode assembly and does not explode, but also does not directly cause potential harm to the user, which helps to protect the safety of the user.

[0046] It should be noted that in other alternative embodiments of the present embodiment, the two pole posts 22 can also be on different sides of the battery shell, for example, one of the pole posts 22 is arranged at the top of the battery shell, and the other pole post 22 is arranged at the side of the battery shell, or the two pole posts 22 are arranged at different sides of the battery shell. As long as the pole post 22 is in a vertical or lateral posture, so that the lug group of the electrode assembly connected with the pole post 22 is also in a vertical or lateral state, so that the lug group cannot be inserted into the pole piece of the electrode assembly, it is within the protection scope of the utility model. Therefore, the present utility model does not limit the setting position of the pole post 22.

[0047] It should be further noted that in other alternative embodiments of the present embodiment, the melting structure 3 can also be arranged on the side of the battery shell facing the external environment, so that after the melting structure 3 melts, the gas pressure and heat in the battery shell can be sprayed away from the vehicle interior, and the safety of other parts in the vehicle and the user in the vehicle can also be ensured. Therefore, arranging the melting structure 3 on the side of the battery shell facing the external environment also belongs to the range to be protected by the present utility model.

[0048] Preferably, in the present embodiment, as shown in Figure 3 It is arranged only on the bottom of the battery shell, and six melting structures 3 are arranged, which can meet the requirements of actual working conditions. Of course, in some other parallel embodiments, the melting structure 3 can also be arranged only on the side of the battery shell facing the external environment, or the melting structure 3 described above is arranged on the bottom of the battery shell and the side of the battery shell facing the external environment. The above three implementation cases all belong to the range to be protected by the present utility model, and the person skilled in the art can select the position and number of the melting structure 3 arranged on the battery shell according to the actual situation to meet the diversified needs of the market for the battery shell.

[0049] As shown in Figure 2 Since no explosion-proof valve assembly is arranged on the cover plate 21, the lower plastic 23 provided by the present embodiment is not arranged with an explosion-proof valve protection area, so that the lower plastic 23 is thinner, which can effectively reduce the occupied space of the lower plastic 23, and help to improve the energy density of the battery.

[0050] As shown in Figure 4As shown, in the present embodiment, the melting structure 3 comprises a first melting part 31 and a second melting part 32, wherein the diameter of the first melting part 31 is smaller than that of the second melting part 32, the first melting part 31 is embedded in the second opening 11, and the second melting part 32 is attached to the inner side wall of the shell 1. During installation, the melting structure 3 is placed into the shell 1 from the first opening, and the first melting part 31 is inserted into the second opening 11 and the second melting part 32 is attached to the inner side wall of the shell 1, thereby completing the installation of the melting structure 3. The installation process is simple and convenient, and the melting structure 3 can be stably installed on the shell 1. In addition, during normal use, the second melting part 32 can limit the sliding of the first melting part 31 in the second opening 11, thereby avoiding the situation that the melting structure 3 slips off the shell 1 and causes the battery to fail.

[0051] In the present embodiment, the end of the first melting part 31 away from the second melting part 32 (i.e., the side of the melting structure 3 facing the external environment) is flush with the end of the second opening 11 facing the external environment, so as to ensure that the bottom plane of the shell 1 is flat and has no protrusions, which helps to improve the stability of the battery shell when placed in a vehicle and prevent tilting or even collapse.

[0052] In the present embodiment, the inner side wall of the shell 1 is provided with a groove 12, so that the thickness of the part of the bottom of the shell 1 located in the groove 12 is smaller than that of the part outside the groove 12, and the second melting part 32 is arranged in the groove 12. In this way, the size of the electrode assembly is not reduced due to the introduction of the melting structure 3, and the overall volume and energy density of the electrode assembly in the battery shell are ensured.

[0053] Specifically, in the present embodiment, the melting structure 3 is made of a high-temperature-resistant polymer material and comprises at least one of a PE (polyethylene) melting part, a PP (polypropylene) melting part, a PET (polyethylene terephthalate) melting part, a PPS (polyphenylene sulfide) melting part, a PTFE (polytetrafluoroethylene) melting part, and a PS (polystyrene) melting part. For example, the melting structure 3 can only use one of the PE melting part, the PP melting part, the PET melting part, the PPS melting part, the PTFE melting part, and the PS melting part, or a mixture of two or more of the PE melting part, the PP melting part, the PET melting part, the PPS melting part, the PTFE melting part, and the PS melting part, so that the temperature value of the melting structure 3 during melting is not higher than the heat temperature generated during thermal runaway of the electrode assembly.

[0054] More specifically, the structural strength of the first melting portion 31 is less than the structural strength of the second melting portion 32, so that the structural strength of the second melting portion 32 is higher, which can support and protect the first melting portion 31, and is not easy to be deformed by the impact under the abnormal situation of the internal pressure of the battery shell or other abnormal situations, so as to improve the installation stability of the melting structure 3 at the second opening 11, and further make the battery shell use reliable, and reduce the risk of accidents.

[0055] Exemplarily, in the embodiment, the first melting portion 31 includes at least one of PE hot melting portion, PP hot melting portion and PPS hot melting portion, and the second melting portion 32 includes at least one of PET hot melting portion and PTFE hot melting portion. For example, the first melting portion 31 can be made of only PE, PP or PPS material, or can be made of a mixture of at least two of PE, PP and PPS materials; the second melting portion 32 can be made of only PET or PTFE material, or can be made of a mixture of PET and PTFE materials. As long as the structural strength of the second melting portion 32 is greater than that of the first melting portion 31, it is within the protection scope of the utility model.

[0056] It should be noted that the above various high-temperature-resistant polymer materials are conventional materials in the art, and no improvement is made in the present application.

[0057] The embodiment also provides a single battery 100, which includes an electrode assembly and the above-mentioned battery shell. The battery shell has a containing chamber, and the electrode assembly is located in the containing chamber, and the pole 22 of the battery shell is conductively connected to the group of pole tabs of the electrode assembly. Since the single battery 100 uses the battery shell in the above-mentioned embodiment, and the above-mentioned battery shell uses the melting structure 3 to replace the explosion-proof valve assembly, compared with the single battery 100 provided by the prior art, when the single battery 100 is on fire and the internal temperature rises, the gas and heat will melt the melting structure 3 and directly spray on the chassis 200 of the vehicle, without igniting other accessories inside the vehicle, thereby providing time for the person to escape from danger. Therefore, the single battery 100 not only will not explode, but also has high safety in use, and will not directly cause potential harm to the user, which helps to protect the safety of the user.

[0058] The single battery 100 provided by the embodiment is a square battery, of course, in other parallel embodiments, the single battery 100 can also be a cylindrical battery or a blade battery.

[0059] The embodiment also provides a battery pack, such as Figure 5As shown, the battery pack includes a plurality of single batteries 100 arranged in a preset direction. The battery pack includes a plurality of single batteries 100 arranged in a normal direction perpendicular to the larger area side of the single battery 100 (i.e. the preset direction), in order to ensure that when one of the single batteries 100 is in thermal runaway, it can prevent the use of other single batteries 100 from being affected, and the melting structure 3 is preferably arranged at the bottom of the single battery 100, i.e. at the bottom of the shell 1, so that the gas pressure and heat generated by the single battery 100 are aligned with the chassis 200 of the vehicle, and other single batteries 100 will not cause thermal runaway, thereby helping to improve the safety and reliability of the battery pack.

[0060] By arranging the above-mentioned single battery 100 on the battery pack, since the melting structure 3 is arranged on the single battery 100, the possibility of fire or even explosion of the battery pack can be reduced, and the personal safety of the user will not be endangered, thereby having high market application value and practicality.

[0061] The embodiment also provides a battery pack, which includes a box body and the battery pack provided by the above-mentioned embodiments, wherein the number of the battery pack can be one or a plurality of parallel arrangements, which is not limited by the utility model. Since the battery pack is provided with the above-mentioned battery pack, it is safe and reliable to use, has a long service life, and can reduce the safety hazards to the user.

[0062] In the description of the present specification, the description of the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above-mentioned terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0063] Obviously, the above-mentioned embodiments of the utility model are only for the purpose of clear illustration of the utility model, and are not a limitation on the implementation mode of the utility model. For ordinary skilled persons in the art, various obvious changes, readjustments and replacements can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A battery case characterized by, The battery shell comprises a shell (1), a top cover and a melting structure (3), the shell (1) has a first opening and a second opening (11), the first opening is located at the top of the shell (1), the top cover is installed on the first opening, the second opening (11) is located at the bottom of the shell (1) and / or the side facing the external environment, and the melting structure (3) is installed on the second opening (11), and the melting structure (3) is arranged to be capable of melting and opening the second opening (11) when the temperature in the shell (1) rises to a temperature threshold.

2. The battery case according to claim 1, wherein The side of the melting structure (3) facing the external environment is flush with the end of the second opening (11) facing the external environment.

3. The battery case according to claim 1 or 2, characterized by The melting structure (3) comprises a first melting part (31) and a second melting part (32), the diameter of the first melting part (31) is smaller than the diameter of the second melting part (32), the first melting part (31) is embedded in the second opening (11), and the second melting part (32) is attached to the inner side wall of the shell (1).

4. The battery case according to claim 3, wherein The inner side wall of the shell (1) is provided with a groove (12), and the second melting part (32) is arranged in the groove (12).

5. The battery case according to claim 1 or 2, wherein The melting structure (3) comprises any one of a PE hot melting part, a PP hot melting part, a PET hot melting part, a PPS hot melting part, a PTFE hot melting part and a PS hot melting part.

6. The battery case of claim 3, wherein, The structural strength of the first melting part (31) is smaller than that of the second melting part (32).

7. The battery case according to claim 1 or 2, wherein The second opening (11) and the melting structure (3) are correspondingly provided with a plurality of openings.

8. A single cell characterized by The battery shell comprises an electrode assembly and the battery shell of any one of claims 1-7, the battery shell has a containing cavity, the electrode assembly is located in the containing cavity, and the pole column (22) of the battery shell is conductively connected to the tab group of the electrode assembly.

9. A battery pack characterized by The battery pack comprises a plurality of single batteries (100) according to claim 8, and the plurality of single batteries (100) are arranged along a preset direction.

10. A battery pack, characterized by, The battery pack comprises a plurality of single batteries (100) according to claim 8, and the plurality of single batteries (100) are arranged along a preset direction.

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