Battery housing assembly and battery

Abstract

The utility model relates to battery structure technical field provides a kind of battery shell assembly and battery, above-mentioned battery shell assembly includes: shell, and shell has inner cavity in it.The top cover of shell is provided with and the injection hole of inner cavity communication, and the side wall of shell forms storage tank to the side of inner cavity.The storage tank extends along the direction perpendicular to the plane where the top cover is located.The side wall is the adjacent side wall of top cover.The battery shell assembly of the utility model, by constructing storage tank in the inner side of the side wall adjacent to top cover, storage tank extends along vertical direction when injecting, a certain amount of electrolyte can be stored in storage tank during injection process, and along groove body forms liquid column with certain height, liquid column can be infiltrated to pole group in shell in different height position, cooperate with the electrolyte deposited in shell bottom, can improve infiltration speed, and it is favorable to make the infiltration of electrolyte to pole group more uniform.

Description

Technical Field

[0001] This utility model relates to the field of battery structure technology, and in particular to a battery casing assembly and a battery. Background Technology

[0002] In related technologies, after the battery is assembled, electrolyte is usually injected into the battery through the injection hole on the battery casing. The injected electrolyte will deposit at the bottom of the battery and gradually wet the electrode assembly. The wetting speed is slow and the wetting is uneven. Utility Model Content

[0003] This invention provides a battery casing assembly and a battery to solve the problem in the prior art where the electrolyte injected into the battery casing will deposit at the bottom of the battery, gradually wetting the electrode assembly, resulting in slow wetting speed and uneven wetting.

[0004] In a first aspect, this utility model provides a battery housing assembly, comprising: The housing has an inner cavity; the top cover of the housing is provided with a liquid injection hole communicating with the inner cavity; a liquid storage tank is formed on the side wall of the housing adjacent to the top cover facing the inner cavity; the liquid storage tank extends in a direction perpendicular to the plane of the top cover. The sidewall is the adjacent sidewall of the top cover.

[0005] The battery casing assembly according to this utility model further includes a guide member disposed in the liquid storage tank. The guide member is used to cooperate with the tank wall of the liquid storage tank to form a liquid storage cavity in the liquid storage tank. The guide member is provided with an immersion hole communicating with the liquid storage cavity and the inner cavity.

[0006] According to the battery housing assembly of this utility model, there are multiple wetting holes, and the multiple wetting holes are arranged at intervals along a direction perpendicular to the plane where the top cover is located.

[0007] According to the battery housing assembly of this utility model, the guide is in the shape of a hollow tube, the outer wall of the guide is in contact with the wall of the liquid storage tank, and the cavity of the guide constitutes the liquid storage cavity.

[0008] According to the battery housing assembly of this utility model, the guide includes a first part and two second parts, the two second parts being respectively connected to the first part; the wetting hole is formed in the first part; One of the second parts is attached to one side wall of the liquid storage tank, and the other second part is attached to the other side wall of the liquid storage tank. The first part is disposed opposite to the bottom wall of the liquid storage tank. The first part, the two second parts, and the bottom wall of the liquid storage tank together form the liquid storage cavity.

[0009] According to the battery casing assembly of this utility model, the diameter of the wetting hole is not less than 1 mm and not more than 4 mm, and the distance between adjacent wetting holes is not less than 15 mm and not more than 40 mm.

[0010] According to the battery housing assembly of this utility model, the housing is a square housing, the sidewall includes two first sidewalls and two second sidewalls, the first sidewalls are connected to the long side of the top cover one-to-one, and the second sidewalls are connected to the short side of the top cover one-to-one. The liquid storage tank is formed at least on the first sidewall.

[0011] According to the battery housing assembly of this utility model, there are multiple liquid storage tanks, and the multiple liquid storage tanks are arranged at intervals along the long side of the top cover on the first side wall.

[0012] According to the battery housing assembly of this utility model, the plurality of liquid storage tanks are arranged symmetrically about the axis of symmetry of the first sidewall.

[0013] Secondly, this utility model also provides a battery, comprising: an electrode assembly and a battery casing assembly as described in any one of the above claims; The electrode assembly is installed in the inner cavity of the housing.

[0014] The battery casing assembly of this utility model has an injection hole on the top cover that communicates with the inner cavity, so that the top cover can be placed upwards for injection when needed. At the same time, a storage tank is constructed on the inner side of the side wall adjacent to the top cover. The storage tank extends vertically during injection and can store a certain amount of electrolyte, forming a liquid column of a certain height along the tank. The liquid column can wet the electrode assembly inside the casing at different heights. Combined with the electrolyte deposited at the bottom of the casing, it can improve the wetting speed and make the electrolyte wetting of the electrode assembly more uniform. This effectively solves the problem in the prior art that the electrolyte injected into the battery casing will deposit at the bottom of the battery and gradually wet the electrode assembly, resulting in slow wetting speed and uneven wetting. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the battery housing assembly provided in an embodiment of the present invention.

[0017] Figure 2This is an exploded view of the battery housing assembly provided in an embodiment of this utility model.

[0018] Figure 3 This is a partial cross-sectional view of the battery housing assembly provided in an embodiment of this utility model.

[0019] Figure 4 This is a partial cross-sectional view of a battery housing assembly provided in another embodiment of the present invention.

[0020] Figure label: 1. Shell; 11. Internal cavity; 12. Side wall; 121. Liquid storage tank; 122. First side wall; 123. Second side wall; 2. Guide component; 21. Immersion hole; 22. First part; 23. Second part. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] The following is combined Figures 1-4 This invention describes the battery housing assembly.

[0023] In some embodiments, such as Figure 1 and Figure 2 As shown, this utility model provides a battery housing assembly, including: a housing 1, with an inner cavity 11 inside the housing 1. A top cover (not shown) of the housing 1 is provided with a liquid injection hole communicating with the inner cavity 11, and a liquid storage tank 121 is formed on the side wall 12 of the housing 1 facing the inner cavity 11. The liquid storage tank 121 extends in a direction perpendicular to the plane of the top cover. The side wall 12 is an adjacent side wall of the top cover.

[0024] In this embodiment, an inner cavity 11 is formed inside the housing 1. The inner cavity 11 is used to accommodate the internal components of the battery (such as electrode assembly) and electrolyte. An injection hole communicating with the inner cavity 11 is provided on the top cover of the housing 1 so that electrolyte can be injected into the inner cavity 11 after battery assembly. It is understood that during electrolyte injection, the top cover of the housing 1 is usually positioned upwards so that the injection hole faces upwards for convenient injection. In this embodiment, a liquid storage tank 121 extending in a direction perpendicular to the plane of the top cover is constructed on the inner side of the side wall 12 adjacent to the top cover. When the battery is filled with electrolyte, the liquid storage tank 121 extends in a vertical direction. During the filling process, a portion of the electrolyte will flow into the liquid storage tank 121. Since the cross-sectional area of ​​the liquid storage tank 121 perpendicular to the vertical direction is small, the electrolyte can form a liquid column of a certain height in the liquid storage tank 121. The liquid column can wet the electrode assembly inside the shell at different height positions, which is beneficial to wet the electrode assembly more quickly and evenly.

[0025] The battery casing assembly of this utility model has an injection hole on the top cover of the casing 1 that communicates with the inner cavity 11, so that the top cover can be placed upwards for injection when needed. At the same time, a storage tank 121 is constructed on the inner side of the side wall 12 adjacent to the top cover. The storage tank 121 extends vertically during injection. During the injection process, a certain amount of electrolyte can be stored in the storage tank 121, and a liquid column of a certain height is formed along the tank. The liquid column can wet the electrode assembly inside the casing at different heights. Combined with the electrolyte deposited at the bottom of the casing 1, the wetting speed can be improved, and it is beneficial to make the electrolyte wetting of the electrode assembly more uniform. This effectively solves the problem in the prior art that the electrolyte injected into the battery casing will deposit at the bottom of the battery and gradually wet the electrode assembly, resulting in slow wetting speed and uneven wetting.

[0026] In addition, it is understood that the electrolyte reservoir 121 can also provide additional electrolyte storage space, allowing the entire housing 1 to hold more electrolyte, which is beneficial to improving the cycle performance of the battery.

[0027] In some embodiments, such as Figure 1 and Figure 2 As shown, the battery housing assembly also includes a guide 2, which is disposed in the liquid storage tank 121. The guide 2 is used to cooperate with the tank wall of the liquid storage tank 121 to form a liquid storage cavity in the liquid storage tank 121. The guide 2 is provided with an immersion hole 21 that connects the liquid storage cavity and the inner cavity 11.

[0028] In this embodiment, a guide 2 is provided inside the liquid storage tank 121. The guide 2 can cooperate with the liquid storage tank 121 to form a liquid storage cavity. For example, the guide 2 can be enclosed by the tank wall of the liquid storage tank 121 to form a liquid storage cavity, or the guide 2 has a liquid storage cavity inside. The guide 2 is simply installed inside the liquid storage tank 121. Compared with the liquid storage tank 121 alone, the communication area between the liquid storage cavity and the inner cavity 11 is smaller. During liquid injection, the electrolyte flowing into the liquid storage cavity is less likely to flow out, and the liquid column in the liquid storage cavity can accumulate to a higher height. By reasonably configuring the position and number of wetting holes 21 on the guide 2, the liquid column in the liquid storage cavity can wet the electrode assembly at a higher position. At the same time, since the liquid column can only flow into the inner cavity 11 through the wetting holes 21 to wet the electrode assembly, the number and position of the wetting holes 21 can be reasonably set according to the corresponding experiments or simulations to achieve fixed-point and directional wetting. This makes the wetting position of the liquid column on the electrode assembly more scientific and reasonable, which is conducive to improving wetting efficiency and shortening wetting time.

[0029] Alternatively, in some embodiments, such as Figure 1 As shown, the length of the guide 2 can be slightly shorter than the length of the storage tank 121. When the storage tank 121 is placed vertically, the top of the guide 2 is slightly lower than the top of the storage tank 121 so that a gap connecting the storage cavity and the inner cavity 11 is formed above the guide 2, so that the electrolyte entering the inner cavity 11 can flow into the storage cavity more smoothly through the gap.

[0030] In some embodiments, such as Figure 1 and Figure 2 As shown, there are multiple wetting holes 21, which are arranged at intervals along a direction perpendicular to the plane of the top cover.

[0031] In this embodiment, by opening multiple wetting holes 21 at intervals on the guide member 2 along the direction perpendicular to the plane of the top cover, the multiple wetting holes 21 are arranged along the height direction of the battery during liquid injection and wetting, so that the electrode group can be wetted at different height positions, the wetting of the electrode group is more uniform, and the wetting effect is better.

[0032] Specifically, in some embodiments, such as Figure 3 As shown, the guide 2 is a hollow tube, and the outer wall of the guide 2 is attached to the wall of the liquid storage tank 121. The tube of the guide 2 forms the liquid storage chamber.

[0033] In this embodiment, by designing the guide 2 as a hollow tube and installing it in the liquid storage tank 121, the cavity of the hollow tube can serve as a liquid storage chamber to store a certain amount of electrolyte. As an integral structure, the hollow tube has better sealing performance in parts other than the wetting hole 21, which can better store electrolyte and wet the electrode group only through the wetting hole 21, thus achieving better fixed-point and directional wetting.

[0034] In one specific embodiment, such as Figure 3 As shown, guide 2 is a square tube.

[0035] Alternatively, in other embodiments, such as Figure 2 and Figure 4 As shown, the guide 2 includes a first part 22 and two second parts 23, which are respectively connected to the first part 22; an immersion hole 21 is formed in the first part 22. One second part 23 is attached to one side wall of the liquid storage tank 121, and the other second part 23 is attached to the other side wall of the liquid storage tank 121. The first part 22 and the bottom wall of the liquid storage tank 121 are arranged opposite to each other. The first part 22, the two second parts 23 and the bottom wall of the liquid storage tank 121 together form a liquid storage cavity.

[0036] In this embodiment, the guide 2 is composed of a first part 22 and two second parts 23 connected together. The two second parts 23 are arranged opposite to each other. When the guide 2 is installed in the liquid storage tank 121, the first part 22 and the bottom wall of the liquid storage tank 121 are arranged opposite to each other, and the two second parts 23 are respectively attached to the two side walls of the liquid storage tank 121. Thus, the first part 22, the two second parts 23, and the bottom wall of the liquid storage tank 121 constitute the four walls of the liquid storage cavity, which together form the liquid storage cavity. Compared with the hollow tubular guide 2, the guide 2 in this embodiment adopts a semi-open structure. The guide 2 itself occupies less space, which is beneficial to increasing the accommodating space in the liquid storage cavity.

[0037] In some embodiments, the aperture of the wetting hole 21 is not less than 1 mm and not more than 4 mm, and the spacing between adjacent wetting holes 21 is not less than 15 mm and not more than 40 mm. In this embodiment, by limiting the aperture of the wetting hole 21, it is to avoid the wetting hole 21 being too large or too small. If the wetting hole 21 is too small, it will increase the processing difficulty of the wetting hole 21 and may cause the electrolyte in the storage cavity to not flow smoothly from the storage cavity into the inner cavity 11. If the wetting hole 21 is too large, it will affect the size and strength of the guide 2. At the same time, by limiting the spacing between adjacent wetting holes 21, the distribution of the wetting holes 21 along the height direction of the battery can be more reasonable, avoiding the wetting holes 21 being too far apart, resulting in an area that cannot be wetted between two wetting holes 21, and avoiding the wetting holes 21 being too close together, resulting in an area that is simultaneously wetted by the electrolyte flowing out of two wetting holes 21.

[0038] In some embodiments, such as Figure 1 and Figure 2As shown, the shell 1 is a square shell, and the side wall 12 includes two first side walls 122 and two second side walls 123. The first side walls 122 are connected to the long side of the top cover one by one, and the second side walls 123 are connected to the short side of the top cover one by one. The liquid storage tank 121 is formed at least on the first side wall 122.

[0039] In this embodiment, the housing 1 is a square housing, suitable for square battery cells. The housing 1 has six sidewalls, each of which is rectangular or square. Taking the top cover as an example with rectangular sidewalls, the sidewalls 12 adjacent to the top cover include four sidewalls, specifically two first sidewalls 122 adjacent to the long side of the top cover and two second sidewalls 123 adjacent to the short side of the top cover. It can be understood that the area of ​​the first sidewalls 122 is obviously larger than that of the second sidewalls 123. In this embodiment, by setting the electrolyte storage tank 121 inside the first sidewalls 122, the electrolyte in the electrolyte storage tank 121 can wet the electrode assembly from the side of the electrode assembly toward the first sidewalls 122, resulting in a larger contact area between the electrolyte and the electrode assembly and a better wetting effect.

[0040] In some embodiments, such as Figure 1 and Figure 2 As shown, there are multiple liquid storage tanks 121, which are arranged at intervals along the long side of the top cover on the first side wall 122.

[0041] In this embodiment, by constructing multiple liquid storage tanks 121 on the first sidewall 122 and arranging them at intervals along the long side of the top cover, the multiple liquid storage tanks 121 can simultaneously store electrolyte during the liquid injection process and simultaneously wet the electrode assembly from one side toward the first sidewall 122 during the subsequent wetting process. The electrolyte in the multiple liquid storage tanks 121 can wet the electrode assembly at different positions on the first sidewall 122, which helps to accelerate the wetting speed and wet the electrode assembly more evenly, resulting in a better wetting effect.

[0042] In some embodiments, such as Figure 1 and Figure 2 As shown, the multiple liquid storage tanks 121 are arranged symmetrically about the axis of symmetry of the first sidewall 122.

[0043] It is understood that the first sidewall 122 is a rectangular sidewall. In this embodiment, the multiple liquid storage tanks 121 on the first sidewall 122 are arranged axially symmetrically about the axis of symmetry of the first sidewall 122, so that the position of the electrode group being wetted is also arranged axially symmetrically about the first sidewall 122, which is beneficial to make the electrode group more uniformly wetted.

[0044] Secondly, this utility model also provides a battery, comprising: an electrode assembly and a battery housing assembly provided in any of the above embodiments. The electrode assembly is installed in the inner cavity 11 of the housing 1. The battery of this utility model, by adopting the battery housing assembly of the above embodiments, also has the advantages of the above-described battery housing assembly, which will not be elaborated further here.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery casing assembly, characterized in that, include: The housing has an inner cavity; the top cover of the housing is provided with a liquid injection hole communicating with the inner cavity; a liquid storage tank is formed on the side wall of the housing adjacent to the top cover facing the inner cavity; the liquid storage tank extends in a direction perpendicular to the plane of the top cover.

2. The battery casing assembly according to claim 1, characterized in that, It also includes a guide member disposed in the liquid storage tank. The guide member is used to cooperate with the tank wall of the liquid storage tank to form a liquid storage cavity in the liquid storage tank. The guide member is provided with an immersion hole that connects the liquid storage cavity and the inner cavity.

3. The battery casing assembly according to claim 2, characterized in that, There are multiple wetting holes, which are arranged at intervals along a direction perpendicular to the plane of the top cover.

4. The battery casing assembly according to claim 2, characterized in that, The guide is a hollow tube, and its outer wall is in contact with the wall of the liquid storage tank. The tube of the guide forms the liquid storage chamber.

5. The battery housing assembly according to claim 2, characterized in that, The guide includes a first part and two second parts, the two second parts being respectively connected to the first part; the wetting hole is formed in the first part; One of the second parts is attached to one side wall of the liquid storage tank, and the other second part is attached to the other side wall of the liquid storage tank. The first part is disposed opposite to the bottom wall of the liquid storage tank. The first part, the two second parts, and the bottom wall of the liquid storage tank together form the liquid storage cavity.

6. The battery housing assembly according to any one of claims 3 to 5, characterized in that, The diameter of the impregnation hole is not less than 1 mm and not more than 4 mm, and the distance between adjacent impregnation holes is not less than 15 mm and not more than 40 mm.

7. The battery housing assembly according to claim 2, characterized in that, The shell is a square shell, and the sidewalls include two first sidewalls and two second sidewalls. The first sidewalls are connected to the long side of the top cover one by one, and the second sidewalls are connected to the short side of the top cover one by one. The liquid storage tank is formed at least on the first sidewall.

8. The battery housing assembly according to claim 7, characterized in that, There are multiple liquid storage tanks, which are arranged at intervals along the long side of the top cover on the first side wall.

9. The battery housing assembly according to claim 8, characterized in that, The plurality of liquid storage tanks are arranged axially symmetrically about the axis of symmetry of the first sidewall.

10. A battery, characterized in that, include: The electrode assembly and the battery housing assembly as described in any one of claims 1 to 9; The pole assembly is installed in the inner cavity of the housing.

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