CN112838335B

CN112838335B - Battery, battery module, battery pack and electric vehicle

Info

Publication number: CN112838335B
Application number: CN201911159779.0A
Authority: CN
Inventors: 孙华军; 鲁志佩; 胡世超; 朱燕; 黄达
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2021-10-22
Anticipated expiration: 2039-11-22
Also published as: CN112838335A

Abstract

The invention provides a battery, which comprises a shell, a plurality of accommodating cavities, a partition plate, a pole core group, a liquid guide hole and a blocking mechanism, wherein the shell is provided with a plurality of accommodating cavities; the liquid guide hole is used for communicating the accommodating cavities on the two sides of the partition plate; the blocking mechanism is at least partially arranged in the partition plate and can rotate relative to the partition plate; the blocking mechanism divides the liquid guide hole into a first liquid guide hole and a second liquid guide hole, and a conducting hole is formed in the blocking mechanism; when the blocking mechanism is in the first state, the first liquid guide hole and the second liquid guide hole are communicated through the conducting hole so as to communicate two adjacent accommodating cavities on two sides of the partition plate; when the blocking mechanism is in the second state, the blocking mechanism separates the first liquid guide hole and the second liquid guide hole so as to disconnect the communication between two adjacent containing cavities at two sides of the partition board; the blocking mechanism is rotatable from a first state to a second state. The invention further provides a battery module, a battery pack and an electric vehicle based on the battery module. The invention realizes the communication and the closing between two adjacent containing cavities at two sides of the partition board in a rotating mode through the blocking mechanism.

Description

Battery, battery module, battery pack and electric vehicle

Technical Field

The invention relates to the field of batteries, in particular to a battery, a battery module, a battery pack and an electric vehicle.

Background

With the continuous popularization of new energy automobiles, the use requirement of power batteries in the new energy automobiles becomes higher and higher. Particularly, the requirement of a user on the continuous mileage of the new energy automobile is continuously improved, and the total capacity of the battery pack used by the new energy automobile is continuously improved; meanwhile, in the using process of the power battery pack, the internal consumption caused by the internal resistance is required to be reduced as much as possible.

The width of a common new energy automobile is generally more than 1 meter, and the length of the common new energy automobile is several meters; the power battery pack serving as a new energy automobile is generally placed at the bottom of the new energy automobile; at present, a power battery pack on the market generally has a width direction approximately consistent with the width of a new energy automobile, and is approximately more than 1 meter. The length is determined according to the reserved space at the bottom of the new energy automobile and is generally more than 2 meters. In the whole, the length and the width of the power battery pack exceed 1 meter; at present, the length of the single battery is about 0.3 meter, so at least 3 single batteries are needed to be arranged side by side in the power battery pack, and even more.

Set up a plurality of battery cells side by side, all need add fixed knot to every battery cell and construct, simultaneously, need carry out power connection through the power connecting piece of peripheral hardware between two adjacent battery cells. The installation structure of the single battery is more, the cost is increased, and the whole weight is increased; meanwhile, in the volume of the single bag body, the installation structure occupies more internal space of the bag body, so that the overall capacity of the power battery bag is reduced, and the more the single batteries are arranged side by side, the more the space is wasted. In addition, because of need set up a plurality of external power connecting pieces and carry out the power connection, lead to the internal resistance to increase, improved the internal consumption of power battery package in use.

In order to solve the above technical problem, patent CN201110021300.4 provides an internal series battery pack, which comprises a battery housing and a plurality of pole groups disposed in the battery housing, wherein the plurality of pole groups are connected in series, and two adjacent pole groups are separated by a partition plate. Therefore, the plurality of pole groups are arranged in the battery shell and are arranged side by side relative to the plurality of single batteries, so that the shell and an external installation structure are reduced, the space utilization rate is improved, and the overall capacity of the power battery pack is ensured; meanwhile, the use of external power connecting pieces is reduced, the mode that the directly adjacent pole groups in the shell are connected in series is changed, the connection stability and reliability of the power connecting pieces do not need to be considered, the connection content can be reduced, and the internal consumption of the power battery pack in use is further reduced.

In the above patent, since a plurality of pole groups are connected in series in parallel, the potential difference between the front and rear ends is high, and if the plurality of pole groups connected in series share the electrolyte in one chamber, the electrolyte is highly likely to be decomposed due to the high potential difference between the front and rear ends, and the single battery fails. In order to solve the above problem, in the above patent, a partition plate is provided between two adjacent pole groups, and each pole group is divided into chambers by the partition plate, and each chamber contains a single electrolyte.

However, in CN201110021300.4, since the partition plates divide the interior of the housing into a plurality of separate cavities, how to inject the electrolyte into each separate cavity and ensure the isolation between two adjacent cavities becomes a problem not considered by CN201110021300.4 and also becomes a core problem of the solution disclosed in CN 201110021300.4.

Disclosure of Invention

The present disclosure is directed to solving at least one of the problems in the prior art. To this end, in a first aspect of the present application, there is provided a battery comprising:

the device comprises a shell and a plurality of accommodating cavities positioned in the shell;

two adjacent accommodating cavities are separated by a partition plate;

the accommodating cavity is internally provided with a pole core group, and the pole core group comprises at least one pole core; the pole core groups in the two adjacent accommodating cavities are connected in series;

at least one partition plate is provided with a liquid guide hole, and the liquid guide hole is used for communicating two adjacent accommodating cavities on two sides of the partition plate;

a blocking mechanism at least partially disposed in the partition and rotatable relative to the partition; the blocking mechanism divides the liquid guide hole into a first liquid guide hole and a second liquid guide hole, and a conducting hole is formed in the blocking mechanism; when the blocking mechanism is in a first state, the first liquid guide hole and the second liquid guide hole are communicated through the via hole so as to communicate two adjacent accommodating cavities on two sides of the partition plate; when the blocking mechanism is in the second state, the blocking mechanism separates the first liquid guide hole and the second liquid guide hole so as to disconnect the communication between two adjacent accommodating cavities at two sides of the partition board; the blocking mechanism is rotatable from a first state to a second state.

In an embodiment of this application, the casing is the integral type structure that extends along first direction, the baffle interval set up in the casing, just the side week of baffle with the casing cooperation will the casing internal portion separates a plurality of hold the chamber, the chamber wall that holds the chamber is including being located the baffle or the end cover that hold the chamber tip, and be located between two adjacent baffles or between baffle and the end cover the casing.

In one embodiment of the present application, the housing includes a plurality of sub-housings arranged along a first direction, the partition board is simultaneously connected to two adjacent sub-housings, two adjacent accommodating chambers share one partition board, and a chamber wall of the accommodating chamber includes the sub-housings and the partition board or the end cap located at an end of the sub-housings.

In an embodiment of this application, the casing is the integral type structure that extends along first direction, be provided with electric core subassembly in the casing, electric core subassembly include the barrier film with the baffle, it is located to hold the chamber inside the barrier film, the baffle interval is located in the barrier film, the side week of baffle with the barrier film cooperation will it is a plurality of to keep apart the intraductal part of membrane hold the chamber, the chamber wall that holds the chamber is including being located the baffle or the end cover that hold the chamber tip to and be located between two adjacent baffles or between baffle and the end cover the barrier film.

In an embodiment of this application, the casing is the integral type structure that extends along first direction, be provided with the core subassembly in the casing, the core subassembly include the barrier film with the baffle, it is located to hold the chamber inside the barrier film, the barrier film includes a plurality of sub-barrier films that set up along first direction, the baffle is connected with two adjacent sub-barrier films simultaneously, and two adjacent chamber sharing one of holding the baffle, the chamber wall that holds the chamber includes sub-barrier film and be located the baffle or the end cover of sub-barrier film tip.

In one embodiment of the present application, the radial cross-section of the blocking means is circular.

In one embodiment of the present application, a first opening and a second opening are oppositely disposed on a circumferential surface of the blocking mechanism near the first end surface, and the first opening and the second opening communicate along a radial direction of the blocking mechanism to form the via hole.

In one embodiment of the present application, a first slot and a second slot are oppositely disposed on a first end surface of the blocking mechanism, and the first slot and the second slot communicate along a radial direction of the blocking mechanism to form the via hole.

In one embodiment of the present application, a portion of a circumference of the blocking mechanism near the first end surface is recessed toward a central axis of the blocking mechanism to form the via hole.

In an embodiment of the present application, a blocking mechanism accommodating space is provided on the partition plate, the blocking mechanism is located in the blocking mechanism accommodating space, and the blocking mechanism accommodating space is communicated with the liquid guide hole.

In an embodiment of the present application, an external thread is disposed on an outer surface of the blocking mechanism, an internal thread matched with the outer surface of the blocking mechanism is disposed on an inner surface of the blocking mechanism accommodating space, and the blocking mechanism rotates in the blocking mechanism accommodating space in a threaded manner.

In one embodiment of the present application, a fool-proof portion is disposed on the second end face of the blocking mechanism; the fool-proof part is used for indicating the communication state of the through hole to the first liquid guide hole and the second liquid guide hole, and the communication state comprises a state that the first liquid guide hole and the second liquid guide hole are arranged in parallel with the through hole so that the first liquid guide hole and the second liquid guide hole are communicated through the through hole.

In an embodiment of the present application, the fool-proof portion is a dent provided on an end surface of the blocking mechanism near the outside of the partition, the dent being provided in parallel with the via hole.

In one embodiment of the application, the blocking mechanism comprises a mechanism top section close to the side periphery of the partition plate and a cylindrical section close to the liquid guide hole, and the outer diameter of the mechanism top end is larger than that of the cylindrical section; the barrier mechanism accommodating space comprises a top channel close to the side periphery of the partition plate and a cylindrical channel close to the liquid guide hole, the inner diameter of the top channel is larger than that of the cylindrical channel, and when the top section of the mechanism rotates to the position, close to the end face of the liquid guide hole, of the top channel, the top channel is abutted and fixed.

In an embodiment of the present application, the blocking mechanism accommodating space further includes a groove corresponding to the cylindrical passage, and when the blocking mechanism rotates from the first state to the second state, one end of the cylindrical segment is inserted into the groove.

In an embodiment of the application, the blocking mechanism accommodating space is further used for injecting liquid into the liquid guide hole, and further injecting liquid into the accommodating cavities adjacent to two sides of the liquid guide hole.

In one embodiment of the application, before the battery is injected, during the injection or formation, or during the overcharge or short circuit of the battery, the blocking mechanism is in the first state, and the via hole is communicated with the liquid guide hole; after the battery is injected with liquid or is formed, the blocking mechanism rotates from the first state to the second state, and the blocking mechanism enables the liquid guide hole to be closed.

In a second aspect of the present application, there is provided a battery module including the battery according to any one of the above embodiments.

In a third aspect of the present application, a battery pack is provided, which includes the battery or at least one of the battery modules described above in any one of the above embodiments.

In a fourth aspect of the present application, there is provided an electric vehicle including the above battery pack.

Compared with the prior art, the beneficial effect that this application has does: first, the battery case is provided with a plurality of pole core groups in series, so that the capacity of the battery can be improved. Secondly, the partition plate is provided with the liquid guide hole, and the electrolyte injected into the battery can flow in two adjacent containing cavities on two sides of the partition plate through the liquid guide hole; the purpose of injecting the electrolyte into the plurality of accommodating cavities can be realized through one-time injection; in addition, if the liquid is injected into the liquid guide hole from the partition plate, the liquid guide hole can guide the electrolyte to two adjacent accommodating cavities on two sides of the partition plate; and the liquid guide hole can balance the air pressure of the accommodating cavity, so that the safety of the battery is improved. Thirdly, the first state and the second state are switched in a rotating mode through the blocking mechanism; during liquid injection, the blocking mechanism is in a first state, the conducting hole in the blocking mechanism is communicated with the first liquid guide hole and the second liquid guide hole, the liquid guide holes are in a conducting state, two adjacent containing cavities on two sides of the partition plate are in a communicating state, and at the moment, electrolyte can flow between the two adjacent containing cavities; after the liquid injection is finished, rotating the blocking mechanism to a second state, wherein at the moment, the blocking mechanism separates the first liquid guide hole from the second liquid guide hole so as to separate the communication between two adjacent accommodating cavities at two sides of the partition board; and then realize that two adjacent holding between the chamber in baffle both sides communicate and close, when conveniently annotating the liquid, guarantee the security of battery at the user state.

Drawings

Fig. 1 is a schematic structural diagram of a battery according to a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a pole core assembly provided in the present invention.

Fig. 3 is a schematic view of a structure of a separator and a blocking mechanism in a battery according to a first embodiment of the present invention.

Fig. 4 is another angle diagram of the structure of the partition board and the blocking mechanism according to the first embodiment of the present invention.

Fig. 5a is a cross-sectional view C-C of fig. 4, and fig. 5a shows a schematic view of the blocking mechanism outside the partition.

Fig. 5b shows a schematic cross-sectional view of the blocking means inside the partition according to the first embodiment of the invention.

Fig. 6 is a partially enlarged view of a portion M in fig. 5 a.

Fig. 7 is a schematic structural diagram of a blocking mechanism in a battery according to a second embodiment of the present invention.

Fig. 8 is a cross-sectional view taken along line D-D of fig. 7.

Fig. 9 is a schematic structural diagram of a blocking mechanism in a battery according to a third embodiment of the present invention.

Fig. 10 is a schematic view of a structure of a separator and a blocking mechanism in a battery according to a fourth embodiment of the invention.

Fig. 11a is a cross-sectional view of a battery with a barrier mechanism and a separator cooperating with each other according to a fourth embodiment of the present invention.

Fig. 11b shows a schematic cross-sectional view of a blocking mechanism inside a partition according to a fourth embodiment of the present invention.

Fig. 12 is a partially enlarged view of a portion L of fig. 11.

Fig. 13 is a schematic structural diagram of a battery according to a fifth embodiment of the present invention.

Fig. 14 is a partial enlarged view of the portion N in fig. 13.

Fig. 15 is a schematic structural diagram of a battery according to a sixth embodiment of the present invention.

Fig. 16 is a schematic structural diagram of a battery according to a seventh embodiment of the present invention.

Fig. 17 is a schematic structural diagram of a battery pack provided in the present application.

Detailed Description

While the following is a description of the preferred embodiments of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to fig. 3, a battery 10 according to a first embodiment of the present invention includes a housing 100 and a plurality of accommodating cavities 400 located in the housing 100; two adjacent accommodating chambers 400 are separated by a partition 300; the electrode core group 200 is arranged in the accommodating cavity 400, and the electrode core group 200 contains at least one electrode core 210 (shown in fig. 2); the pole core groups 200 in two adjacent accommodating cavities 400 are connected in series; at least one of the separators 300 is provided with a liquid guiding hole 310 (as shown in fig. 3), the liquid guiding hole 310 is used for communicating two adjacent accommodating cavities 400 of the separator 300 along two sides of a first direction a, and the first direction a is a length direction of the battery 10.

As shown in fig. 1, the case 100 of the battery 10 accommodates 3 electrode core groups 200 therein, and the three electrode core groups 200 are arranged in the length direction of the battery 10 and connected in series. Of course, in other embodiments, the number of pole core sets 200 may be 2, 4, or more.

In one embodiment of the present invention, as shown in fig. 1, 2 partition plates 300 are disposed in the casing 100, the 2 partition plates 300 partition the inside of the casing 100 into 3 accommodating cavities 400, and meanwhile, one pole core group 200 is disposed in each accommodating cavity 400, and the pole core groups 200 are connected in series in sequence; in other embodiments of the present invention, the number of the separators 300 may be 1 or more than 2, and each accommodation chamber 400 may accommodate only one pole-core group 200 as shown in fig. 1, or may accommodate a plurality of pole-core groups 200, such as 2 or 3, side by side in one accommodation chamber 400. In the present invention, it is desirable that one core assembly 200 is accommodated in one accommodation chamber 400, so that the best isolation effect can be achieved.

The liquid guide hole 310 in the battery provided by the invention is communicated with two adjacent accommodating cavities 400 at two sides of the separator 300, when the battery is filled with liquid, electrolyte can be injected into the accommodating cavity 400 at one side of the separator 300, and the electrolyte can flow into the accommodating cavity 400 at the other side of the separator 300 through the liquid guide hole 310. The liquid guiding hole 310 can also balance the air pressure in the accommodating cavity 400 at both sides of the partition 300, for example, when the air pressure in the accommodating cavity 400 at one side of the partition 300 is increased due to the overcharge of the pole core set 200 in the accommodating cavity 400, the air pressure in the accommodating cavity 400 can be reduced through the liquid guiding hole 310, so that the explosion caused by the excessive air pressure in the accommodating cavity 400 is avoided, and the battery safety is improved.

Referring to fig. 4 to 6, the battery 10 further includes a blocking mechanism 500, wherein the blocking mechanism 500 is at least partially disposed in the separator 300 and can rotate relative to the separator 300; the blocking mechanism 500 divides the liquid guiding hole 310 into a first liquid guiding hole 311 and a second liquid guiding hole 312 (as shown in fig. 5b and fig. 6), and the blocking mechanism 500 is provided with a via hole 510 (as shown in fig. 6); when the blocking mechanism 500 is in the first state, the first liquid guide hole 311 and the second liquid guide hole 312 are communicated through the via hole 510 to communicate two adjacent accommodating cavities 400 at two sides of the partition 300; when the blocking mechanism 500 is in the second state, the blocking mechanism 500 separates the first liquid guide hole 311 and the second liquid guide hole 312 to disconnect the two adjacent accommodating cavities 400 at the two sides of the partition 300; the blocking mechanism 500 is rotatable from a first state to a second state.

The blocking mechanism 500 in the present application achieves the transition between the first state and the second state by means of rotation. The first state and the second state may be two states of the blocking mechanism 500 at different positions in the second direction B, the second direction B being a direction toward the ground when the battery normally works, for example, the first state is a state where the blocking mechanism 500 is located at a first height from the ground, and the second state is a state where the blocking mechanism 500 is located at a second height from the ground, that is, the blocking mechanism 500 also changes the height from the ground during the rotation process. The first state and the second state may also be two states in which the blocking mechanism 500 rotates to different angles around its axis, for example, the first state is a state in which the blocking mechanism 500 rotates to a first angle around its axis, and the second state is a state in which the blocking mechanism 500 rotates to a second angle around its axis, that is, the blocking mechanism 500 only changes the angle during the rotation process, and does not change the height from the ground.

The battery 10 provided by the invention realizes the conversion between the first state and the second state in a rotating mode through the blocking mechanism 500, and further realizes the communication and the closing between two adjacent accommodating cavities 400 at two sides of the partition board 300.

In a further embodiment, the blocking mechanism 500 is in the first state before filling, during filling or formation of the battery 10, or during overcharge or short circuit of the battery, and the via hole 510 is in communication with the liquid guiding hole 310. Before or during injection of the battery 10, the blocking mechanism 500 is in the first state, and the electrolyte can flow between the accommodating chambers 400. When the battery 10 is overcharged or short-circuited, the air pressure of the accommodating cavity 400 is increased, and when the air pressure is excessively increased, the risk of explosion exists, at this time, the blocking mechanism 500 is located in the first state, and the via hole 510 is communicated with the liquid guide hole 310, so that the air pressure between the accommodating cavities 400 can be balanced, and the risk of explosion is reduced.

After the battery 10 is filled with liquid or after formation, the blocking mechanism 500 rotates from the first state to the second state, and the blocking mechanism 500 closes the liquid guide hole 310. Electrolyte in the accommodating cavity 400 can be prevented from passing through the liquid guide hole 310 into the adjacent accommodating cavity 400 during the use of the battery 10, and the current short circuit can be prevented.

In the present application, the pole core 210 is a pole core commonly used in the field of power batteries, and the pole core 210 and the pole core group 200 are components inside the outer shell of the battery 10 and cannot be understood as the battery 10 itself; the pole core 210 can be formed by winding, or the pole core 210 can be made in a lamination mode; generally, the core 210 includes at least a positive electrode sheet, a separator, and a negative electrode sheet, and an electrolyte, and the core 210 generally refers to an assembly that is not completely sealed. Thus, the battery 10 referred to in the present application cannot be simply understood as a battery module or a battery pack because it includes a plurality of pole pieces 210. In the present application, the pole core set 200 may be composed of a single pole core 210; at least two pole cores 210 can also be included, and the at least two pole cores 210 are connected in parallel to form the pole core group 200. For example, after two pole cores 210 are connected in parallel, a pole core group 200 is formed; or four pole cores 210 are connected in parallel to form the pole core group 200.

In the present application, when a plurality of pole core groups 200 are connected in series, the electrolyte in different pole core groups 200 is in a communicated state, and an internal short circuit problem exists; in addition, a higher potential difference exists between different pole core groups 200 (taking a lithium iron phosphate battery as an example, the potential difference is about 4.0-7.6V), and the electrolyte in the pole core groups can be decomposed due to the larger potential difference, so that the performance of the battery is influenced; particularly, the separator 300 is disposed between the adjacent pole core groups 200. Preferably, in order to better perform the function of insulation and isolation, the separator 300 itself may be made of an insulating material, that is, the separator 300 is an insulating separator 300. In this manner, it is possible to isolate two adjacent pole core groups 200 directly by the separator 300 and maintain insulation therebetween without performing other operations.

In the present application, the partition 300 divides the accommodation space into a plurality of accommodation cavities 400, each of which accommodates the pole core assembly 200 in the accommodation cavity 400, in other words, is completely different from the conventional battery module, and two adjacent accommodation cavities 400 share one partition 300, so that the battery 10 described in the present application is different from the battery module in the prior art

In a further embodiment, the casing 100 is a one-piece structure extending along the first direction a, the partition plates 300 are arranged in the casing 100 at intervals, and the side peripheries of the partition plates 300 are matched with the casing 100 to divide the interior of the casing 100 into a plurality of accommodating chambers 400, the chamber walls of the accommodating chambers 400 include the partition plates 300 or the end caps 410 (shown in fig. 1) at the ends of the accommodating chambers 400, and the casing 100 is located between two adjacent partition plates 300 or between the partition plates 300 and the end caps 410. Taking the battery 10 with two separators 300 and three accommodating chambers 400 separated by two separators 300 as an example, the chamber walls of the accommodating chambers 400 at two ends of the battery 10 are composed of the separators 300 and the end caps 410, and the housing 100 therebetween, and the chamber wall of the accommodating chamber 400 in the middle of the battery is composed of two separators 300 and the housing 100 between two separators 300.

The invention separates two adjacent pole core groups 200 by the same clapboard 300, and connects a plurality of pole core groups 200 in series in the shell 100, which can improve the capacity of the battery.

In a further embodiment, the radial cross-section of the blocking mechanism 500 is circular. The radial cross-section is circular, allowing the barrier structure 500 to rotate more smoothly. In this embodiment, the outer surface of the blocking structure 500 is a circumferential surface.

Referring again to fig. 6, in a further embodiment, the blocking mechanism 500 includes a first end surface 520, where the first end surface 520 is an end surface of the blocking mechanism 500 facing the ground when the battery 10 is in normal use; the circumferential surface 530 of the blocking mechanism 500 near the first end surface 520 is oppositely provided with a first opening 540 and a second opening 550, and the first opening 540 and the second opening 550 are communicated along the radial direction of the blocking mechanism 500 to form a through hole 510. The circumferential surface 530 of the barrier 500 refers to the surface between the two end surfaces of the barrier 500.

When the blocking mechanism 500 is in the first state, the first opening 540 is communicated with the first liquid guiding hole 311, and the second opening 550 is communicated with the second liquid guiding hole 312, so as to communicate the accommodating cavities 400 at two sides of the partition 300. When the blocking mechanism 500 rotates to the second state, the portion of the circumferential surface 530 close to the first end surface 520, which is not provided with the opening, aligns with the first liquid guiding hole 311 and the second liquid guiding hole 312, so as to block the communication between the first liquid guiding hole 311 and the second liquid guiding hole 312, and further block the communication between the accommodating cavities 400 at the two sides of the partition 300. In this embodiment, the first state refers to a state in which the blocking mechanism 500 rotates around its axis by a first angle, and the second state refers to a state in which the blocking mechanism 500 rotates around its axis by a second angle, that is, only the angle of the blocking mechanism 500 is changed during the rotation process, and the height from the ground is not changed.

It should be noted that the width of the circumferential surface portion between the first opening 540 and the second opening 550 is at least equal to the aperture of the first liquid guiding hole 311 and the second liquid guiding hole 312, so that when the blocking mechanism 500 is in the second state, the circumferential surface portion between the first opening 540 and the second opening 550 can completely close the first liquid guiding hole 311 and the second liquid guiding hole 312.

In a further embodiment, the partition 300 is provided with a blocking mechanism accommodating space 320, the blocking mechanism 500 is located in the blocking mechanism accommodating space 320 (as shown in fig. 5 b), and the blocking mechanism accommodating space 320 is communicated with the liquid guide hole 310. The barrier mechanism 500 rotates by itself in the barrier mechanism housing space 320 or rotates up and down in the second direction B.

In a further embodiment, the blocking mechanism accommodating space 320 is further used for filling the liquid into the liquid guiding hole 310, so as to fill the adjacent accommodating cavities 400 at two sides of the liquid guiding hole 310. In the present application, the stopper housing space 320 is a housing space of the stopper mechanism 500 for stopping and sealing the liquid guide hole 310, and is used as a liquid injection hole for injecting the electrolyte into the battery 10.

In a further embodiment, the blocking mechanism 500 includes a second end 560 (shown in fig. 6), the second end 560 referring to the end of the cell 10 that faces away from the ground when the blocking mechanism 500 is in normal use; a fool-proof part 561 is arranged on the second end surface 560 of the blocking mechanism 500; the fool-proof portion 561 indicates a communication state of the via hole 510 with respect to the first liquid guide hole 311 and the second liquid guide hole 312, and the communication state includes a state in which the first liquid guide hole 311 and the second liquid guide hole 312 are arranged in parallel with the via hole 510 and the first liquid guide hole 311 and the second liquid guide hole 312 are communicated with each other through the via hole 510. Through the arrangement of the fool-proof portion 561, the user can know the state of the blocking mechanism 500 blocking the via 510 more clearly, thereby improving the operation convenience.

In a further embodiment, the fool-proof portion 561 is a dent 561 disposed on the blocking mechanism 500 near the second end 560 of the partition 300, and the dent 561 is disposed in parallel with the through hole 510. Generally, the liquid guide holes 310 are formed through the separator 300 along the first direction a, and the liquid guide holes 310 are parallel to the first direction a. When the blocking mechanism 500 is rotated and the dent 561 is found to be parallel to the liquid guiding hole 310, it can be determined that the via hole 510 is parallel to the liquid guiding hole 310, and thus it can be known that the blocking mechanism 500 is in the first state at this time, and the via hole 510 is communicated with the liquid guiding hole 310; when the blocking mechanism 500 is rotated and the dent 561 is found to be perpendicular to the liquid guide hole 310, it can be determined that the via hole 510 is perpendicular to the liquid guide hole 310, and thus it can be seen that the blocking mechanism 500 is in the second state at this time, and the via hole 510 is blocked from the liquid guide hole 310.

Referring to fig. 7 and fig. 8, a battery 10a according to a second embodiment of the present invention is different from the first embodiment in that a blocking mechanism 500 of the battery 10a includes a first end surface 520, where the first end surface 520 is an end surface of the blocking mechanism 500 facing the ground when the battery 10 is in normal use; the first end surface 520 of the blocking mechanism 500 is oppositely provided with a first open slot 521 and a second open slot 522, and the first open slot 521 and the second open slot 522 are communicated along the radial direction of the blocking mechanism 500 to form the through hole 510.

Referring to fig. 9, a battery 10b according to a third embodiment of the present invention is different from the first embodiment in that a blocking mechanism 500 of the battery 10b includes a first end surface 520, and the first end surface 520 is an end surface of the blocking mechanism 500 facing the ground when the battery 10 is in normal use; a portion of the circumferential surface 530 of the stop mechanism 500 near the first end surface 520 is recessed toward a central axis of the stop mechanism 500 to form a via 510. The through hole 510 is similar to the notch on the circumferential surface 530 of the blocking mechanism 500, and with this arrangement, compared with the arrangement of the first opening 540 and the second opening 550 in the first embodiment, the structure of the through hole 510 in the shape of the notch in the present embodiment is easier to form, and the manufacturing process is simplified.

Referring to fig. 10 to 12, a battery 10c according to a fourth embodiment of the present invention is different from the first embodiment in that an external thread 501 is disposed on an outer surface of a blocking mechanism 500 in the battery 10c, an internal thread 321 matched with the outer surface of the blocking mechanism 500 is disposed on an inner surface of a blocking mechanism accommodating space 320, and the blocking mechanism 500 is rotated in the blocking mechanism accommodating space 320 in a threaded manner. The blocking mechanism 500 is moved up and down in the second direction B by adopting a threaded rotation manner, that is, in this embodiment, the first state is a state where the blocking mechanism 500 is located at a first height from the ground, and the second state is a state where the blocking mechanism 500 is located at a second height from the ground, that is, the height from the ground is also changed during the rotation of the blocking mechanism 500.

In a further embodiment, the retention mechanism 500 includes a mechanism top section 570 proximate to the separator side perimeter 330 and a cylindrical section 580 proximate to the drain hole 310, the separator side perimeter 330 being the surface of the separator 300 that faces away from the ground during normal use of the cell 10, the mechanism top end 570 having an outer diameter greater than the outer diameter of the cylindrical section 580; the blocking mechanism accommodating space 320 comprises a top channel 322 close to the side periphery 330 of the partition plate and a cylindrical channel 323 close to the liquid guide hole 320, wherein the inner diameter of the top channel 322 is larger than that of the cylindrical channel 323, and the top section 570 is abutted and fixed when the top channel 322 rotates to the end face close to the liquid guide hole 320. Further, the blocking mechanism 500 can be stably fixed in the blocking mechanism accommodating space 320, and the situation that the blocking mechanism 500 is loosened from the blocking mechanism accommodating space 320 due to battery shaking and the sealing performance when the liquid guide hole 310 is closed is influenced is avoided.

In a further embodiment, the blocking mechanism receiving space 320 further comprises a groove 324 (shown in fig. 12), the groove 324 corresponding to the cylindrical passage 323, and an end of the cylindrical segment 580 is inserted into the groove 324 when the blocking mechanism 500 is rotated from the first state to the second state. Wherein the groove 324 is opened on the wall of the hole on the side of the drainage hole 310 facing the ground. The blocking mechanism 500 is further fixed in the partition 300, so that the situation that the blocking mechanism 500 is loosened from the blocking mechanism accommodating space 320 due to battery shaking, and the sealing performance when the liquid guide hole 310 is closed is further influenced is avoided.

Referring to fig. 13 and 14, a fifth embodiment of the invention provides a battery 10d, which is different from the first embodiment in that a housing 100 in the battery 10d includes a plurality of sub-housings 110 arranged along a first direction a, a partition 300 is simultaneously connected to two adjacent sub-housings 110, two adjacent accommodating chambers 400 share one partition 300, and a wall of each accommodating chamber 400 includes the sub-housing 110 and the partition 300 or an end cap 410 at an end of the sub-housing 110. Taking the battery 10d with two separators 300 and three accommodating chambers 400 separated by two separators 300 as an example, the chamber walls of the accommodating chambers 400 at two ends of the battery 10 are composed of the separators 300 and the end caps 410, and the sub-housing 110 therebetween, and the chamber wall of the accommodating chamber 400 in the middle of the battery is composed of two separators 300 and the sub-housing 110 between two separators 300.

Referring to fig. 15, a sixth embodiment of the present invention provides a battery 10e, which is different from the first embodiment, in which a housing 100 of the battery 10e is an integrated structure extending along a first direction a, a cell assembly 700 is disposed in the housing 100, the cell assembly 700 includes a separation film 600 and a partition board 300, receiving cavities 400 are located inside the separation film 600, the partition boards 300 are spaced inside the separation film 600, a side circumference of the partition board 300 cooperates with the separation film 600 to divide the inside of the separation film 600 into the receiving cavities 400, a cavity wall of each receiving cavity 400 includes the partition board 300 or an end cap 410 located at an end of the receiving cavity 400, and the separation film 600 located between two adjacent partition boards 300 or between the partition board 300 and the end cap 410.

In this embodiment, when a plurality of pole core sets 200 are connected in series, the voltage between different pole core sets 200 is different, which may cause the local potential of the outer shell, such as the aluminum shell, to be too low, and at this time, lithium ions are easily inserted into the inner part of the outer shell to form a lithium-aluminum alloy, and the aluminum shell is corroded, so in this embodiment, the isolating film 600 is disposed between the shell 100 and the pole core set 200 for isolating the contact between the electrolyte and the shell 100. The separator 600 has a certain insulation property and an electrolyte corrosion resistance, and the material of the separator 600 is not particularly limited as long as it can insulate and does not react with the electrolyte. In some embodiments, the material of the separation film 600 may include polypropylene (PP), Polyethylene (PE), or a multilayer composite film, for example, in some embodiments, a multilayer composite film including an inner layer including a plastic material, an outer layer, and an intermediate layer between the inner and outer layers, for example, the inner layer may be made using a material that is less reactive with the electrolyte within the separation film and has insulating properties. For example, PP or PE, the intermediate layer comprising a metal material capable of preventing the permeation of water vapor outside the battery while preventing the permeation of the internal electrolyte as the metal layer, preferably using aluminum foil, stainless steel foil, copper foil, etc., preferably aluminum foil in view of moldability, light weight and cost, and preferably using a pure aluminum-based or aluminum-iron-based alloy material as the material of the aluminum foil; the outer layer is a protective layer, and is made of a high-melting-point lifting or nylon material, so that the battery has strong mechanical performance, prevents external force from damaging the battery, and plays a role in protecting the battery. In the case where the inner film is a multilayer composite film, one embodiment is that the inner film is an aluminum-plastic composite film.

In some embodiments, the separator has a certain flexibility to facilitate the molding process of the battery 10 and to prevent puncture and the like. The thickness of the isolation film is preferably 80um to 200um, but may be adjusted according to the actual situation.

Referring to fig. 16, a seventh embodiment of the present invention provides a battery 10f, which is different from the first embodiment in that a housing 100 of the battery 10f is an integral structure extending along a first direction, a cell assembly 700 is disposed in the housing 100, the cell assembly 700 includes a separation film 600 and a partition 300, an accommodating chamber 400 is located inside the separation film 600, the separation film 600 includes a plurality of sub-separation films 610 disposed along the first direction a, the partition 300 is simultaneously connected to two adjacent sub-separation films 610, two adjacent accommodating chambers 400 share one partition 300, and a chamber wall of the accommodating chamber 400 includes the sub-separation films 610 and the partition 300 or an end cap 410 disposed at an end of the sub-separation films 610. The battery 10f differs from the battery 10e in the sixth embodiment in that the separator 600 is provided separately, and the separator 600 is divided into a plurality of sub-separators 610.

In this application, casing 100 is used for improving the intensity of battery, guarantees the safe handling of battery, can be plastic housing 100, also can be metal casing 100, and when being metal casing 100, heat dispersion is better, and casing 100's intensity is higher, can self play the effect of support.

In the present application, the battery may be a lithium ion battery.

In the present application, other structures of the battery 10 are the same as those of the conventional arrangement of the prior art, such as an explosion-proof valve, a current interrupting device, etc., and will not be described in detail herein.

In another aspect of the present application, there is provided a battery module including the battery 10 of any of the above embodiments. Adopt the battery module that this application provided, assembly process is few, and the cost of battery is lower.

As shown in fig. 17, the present application provides a battery pack 20 including the battery 10 of any one of the above embodiments or the above provided battery module. By adopting the battery pack 20 provided by the application, the assembly process is less, the cost of the battery is lower, and the energy density of the battery pack 200 is higher.

The invention also provides an electric vehicle which comprises the battery pack 20. The electric vehicle provided by the application has the advantages of high cruising ability and low cost.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A battery, comprising: the device comprises a shell and a plurality of accommodating cavities positioned in the shell;

two adjacent accommodating cavities are separated by a partition plate;

2. The battery of claim 1, wherein the housing is a one-piece structure extending along a first direction, the partition plates are arranged in the housing at intervals, and the side peripheries of the partition plates cooperate with the housing to divide the interior of the housing into a plurality of accommodating cavities, the walls of the accommodating cavities include partition plates or end caps at the ends of the accommodating cavities, and the housing is located between two adjacent partition plates or between a partition plate and an end cap.

3. The battery of claim 1, wherein the housing comprises a plurality of sub-housings arranged along a first direction, the partition is simultaneously connected with two adjacent sub-housings, two adjacent accommodating chambers share one partition, and the wall of each accommodating chamber comprises the sub-housings and a partition or an end cap at the end of the sub-housing.

4. The battery of claim 1, wherein the housing is an integrated structure extending along a first direction, the housing is provided with an electric core assembly, the electric core assembly comprises an isolation film and the partition board, the accommodating cavity is located inside the isolation film, the partition board is located in the isolation film at intervals, the partition board is matched with the isolation film at a side periphery to divide the inner part of the isolation film into a plurality of accommodating cavities, and the cavity wall of each accommodating cavity comprises a partition board or an end cover located at the end of the accommodating cavity and the isolation film located between two adjacent partition boards or between the partition board and the end cover.

5. The battery according to claim 1, wherein the housing is an integrated structure extending along a first direction, the housing is provided with an electric core assembly, the electric core assembly comprises an isolation film and the partition board, the accommodating cavity is located inside the isolation film, the isolation film comprises a plurality of sub-isolation films arranged along the first direction, the partition board is simultaneously connected with two adjacent sub-isolation films, two adjacent accommodating cavities share one partition board, and the cavity wall of the accommodating cavity comprises the sub-isolation films and the partition board or the end cover located at the end part of the sub-isolation films.

6. The cell defined in claim 1, wherein the blocking mechanism is circular in radial cross-section.

7. The battery of claim 6, wherein the circumferential surface of the blocking mechanism near the first end surface is provided with a first opening and a second opening which are opposite to each other, and the first opening and the second opening are communicated along the radial direction of the blocking mechanism to form the via hole.

8. The cell defined in claim 6, wherein the first end surface of the blocking mechanism has a first slot and a second slot disposed opposite to each other, the first slot and the second slot communicating in a radial direction of the blocking mechanism to form the via hole.

9. The cell defined in claim 6, wherein a portion of the circumference of the barrier adjacent the first end surface is recessed toward a central axis of the barrier to form the via.

10. The battery of claim 6, wherein the partition is provided with a blocking mechanism accommodating space, the blocking mechanism is located in the blocking mechanism accommodating space, and the blocking mechanism accommodating space is communicated with the liquid guide hole.

11. The battery of claim 10, wherein the outer surface of the blocking mechanism is provided with an external thread, and the inner surface of the blocking mechanism accommodating space is provided with an internal thread matching the outer surface of the blocking mechanism, and the blocking mechanism is screwed in the blocking mechanism accommodating space.

12. The battery of claim 1, wherein a fool-proof portion is disposed on the second end face of the blocking mechanism; the fool-proof part is used for indicating the communication state of the through hole to the first liquid guide hole and the second liquid guide hole, and the communication state comprises a state that the first liquid guide hole and the second liquid guide hole are arranged in parallel with the through hole so that the first liquid guide hole and the second liquid guide hole are communicated through the through hole.

13. The battery according to claim 12, wherein the fool-proof portion is a dent provided on an end surface of the stopper mechanism near the outside of the separator, the dent being provided in parallel with the via hole.

14. The battery of claim 11, wherein the blocking mechanism comprises a mechanism top section adjacent to a side periphery of the separator and a cylindrical section adjacent to the drain hole, wherein an outer diameter of the mechanism top section is larger than an outer diameter of the cylindrical section; the barrier mechanism accommodating space comprises a top channel close to the side periphery of the partition plate and a cylindrical channel close to the liquid guide hole, the inner diameter of the top channel is larger than that of the cylindrical channel, and when the top section of the mechanism rotates to the position, close to the end face of the liquid guide hole, of the top channel, the top channel is abutted and fixed.

15. The battery of claim 14, wherein the retention mechanism receiving space further comprises a groove corresponding to the cylindrical channel, wherein an end of the cylindrical segment is inserted into the groove when the retention mechanism is rotated from the first state to the second state.

16. The battery of claim 10, wherein the blocking mechanism accommodating space is further configured to inject liquid into the liquid guiding hole, so as to inject liquid into the accommodating cavities adjacent to two sides of the liquid guiding hole.

17. The battery of claim 1, wherein the blocking mechanism is in the first state before the battery is injected, during the injection or formation of the battery, or during the overcharge or short circuit of the battery, and the via hole is in communication with the drain hole; after the battery is injected with liquid or is formed, the blocking mechanism rotates from the first state to the second state, and the blocking mechanism enables the liquid guide hole to be closed.

18. A battery module comprising a plurality of the batteries according to any one of claims 1 to 17.

19. A battery pack comprising a plurality of batteries according to any one of claims 1 to 17 or at least one battery module according to claim 18.

20. An electric vehicle comprising the battery module according to claim 18 or the battery pack according to claim 19.