Battery cell shell, battery cell and battery pack

Abstract

The utility model provides a battery cell shell, a battery cell and a battery pack. The battery cell shell comprises a shell body and a cover plate, the containing cavity is located in the shell body, the liquid inlet channel and the liquid outlet channel are located on the periphery of the containing cavity and arranged in the circumferential direction of the containing cavity in a separated mode, the communicating channels are arranged between the liquid inlet channel and the liquid outlet channel and sequentially communicate with one another, and the liquid inlet channel and the liquid outlet channel communicate with the adjacent communicating channels correspondingly; the plurality of communication channels are communicated with each other; the cover plates are arranged at the two ends of the shell body, and at least one cover plate is provided with a liquid inlet communicated with the liquid inlet channel and / or a liquid outlet communicated with the liquid outlet channel. According to the battery cell shell disclosed by the utility model, a cooling medium sequentially flows through the communicating channels from the liquid inlet channel and then flows into the liquid outlet channel, so that the accommodating cavity can be cooled, and a relatively good cooling effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery cell shell; at the same time, the utility model also relates to a battery cell provided with the battery cell shell, and a battery pack provided with the battery cell. Background Art

[0002] At present, the main types of power batteries for new energy vehicles include lithium-ion batteries, lithium cobalt oxide batteries, lithium iron phosphate batteries, and lithium iron phosphate batteries, etc. These battery types play a key role in electric vehicles, providing the required power and endurance for the vehicles.

[0003] Among them, cylindrical cells are a common type of battery, and their design and structure make them a place in the field of power batteries. Its advantages include high energy density and high power output, which enable electric vehicles to achieve longer driving range and faster acceleration performance. In addition, cylindrical cells usually have good heat dissipation performance, which can effectively dissipate the heat generated by the battery when working at high power, improving the safety and reliability of the battery. In addition, cylindrical cells also have a long service life and can withstand multiple charge and discharge cycles while maintaining relatively stable performance.

[0004] Existing cylindrical cells are usually cooled by a serpentine liquid cooling plate arranged between multiple cylindrical cells. The liquid cooling plate is arranged between two rows of cylindrical cells and removes the heat of the cylindrical cells by contacting the side walls of the cylindrical cells. However, when the diameter of the large cylindrical cells is large, the cooling effect of the serpentine liquid cooling plate is not good. When the cylindrical cells are fast charged, a good cooling effect cannot be achieved, which is not conducive to the safety of the cylindrical cells. Utility Model Content

[0005] In view of this, the utility model aims to provide a battery cell casing to improve the cooling effect.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A battery cell shell comprises a shell body and a cover plate; the shell body has an accommodating cavity located inside, a liquid inlet channel and a liquid outlet channel located on the periphery of the accommodating cavity and separated along the circumference of the accommodating cavity, and a plurality of connecting channels arranged between the liquid inlet channel and the liquid outlet channel and connected in sequence, the liquid inlet channel and the liquid outlet channel are respectively connected to the adjacent connecting channels and are connected together through the plurality of connecting channels; the cover plates are arranged at both ends of the shell body, and at least one of the cover plates is provided with a liquid inlet connected to the liquid inlet channel, and / or a liquid outlet connected to the liquid outlet channel.

[0008] Furthermore, two adjacent connecting channels, as well as the liquid inlet channel, the liquid outlet channel and adjacent connecting channels are all connected via connecting ports; a plurality of connecting ports are alternately arranged in sequence at both ends of the shell body along the circumference of the accommodating cavity, and the cooling medium flows from the liquid inlet channel through each connecting channel in a circuitous manner and then flows into the liquid outlet channel.

[0009] Furthermore, the shell body includes an inner shell having the accommodating cavity, and an outer shell sleeved outside the inner shell, the inner shell being connected to the outer shell via a plurality of connecting ribs arranged at intervals along the circumference of the accommodating cavity; and the liquid inlet channel, the liquid outlet channel and the connecting channels are respectively formed between two adjacent connecting ribs and the cover plates at both ends.

[0010] Furthermore, the cross section of the inner shell is circular; and / or the cross section of the outer shell is square.

[0011] Furthermore, the number of the connecting ribs is four and they are spaced apart along the circumference of the inner shell.

[0012] Furthermore, at least one of the length a, width b and height c of the shell body satisfies: 200≤a≤1200mm, 20≤b≤100mm; 20≤c≤100mm.

[0013] Furthermore, one of the cover plates is provided with a through hole for the output pole block of the power supply core to pass through; and / or, the other cover plate is provided with an explosion-proof valve connected to the accommodating cavity.

[0014] Furthermore, the liquid inlet channel, the liquid outlet channel and each of the connecting channels are all extended along the axial direction of the accommodating cavity.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The battery cell shell described in the utility model is convenient for installing the electrode group or the winding core by providing the accommodating cavity in the shell body, and is convenient for the cooling medium to flow from the liquid inlet channel through each connecting channel in sequence and then into the liquid outlet channel by arranging the liquid inlet channel and multiple connecting channels on the periphery of the accommodating cavity, so as to cool the accommodating cavity with good cooling effect. Meanwhile, compared with the solution of additionally arranging the liquid cooling plate, it can also reduce the space occupied in the battery pack and improve the energy density of the battery pack.

[0017] In addition, multiple connecting ports are alternately arranged at both ends of the shell body along the circumference of the accommodating cavity, which is conducive to the cooling medium flowing from the liquid inlet channel through each connecting channel and then flowing into the liquid outlet channel, further extending the flow path of the cooling medium, thereby facilitating the improvement of the cooling efficiency of the shell body. The structure of the inner shell, the outer shell and the connecting ribs is simple and easy to arrange and implement. The cross-section of the inner shell is circular, which is conducive to the installation of the cylindrical battery core, and the cross-section of the outer shell is directional, which is conducive to the arrangement and implementation, and can also help to increase the flow of the cooling medium, with a better cooling effect.

[0018] In addition, there are four connecting ribs, which has the advantage of easy layout and implementation. The setting of the length, width and height parameters of the shell body is conducive to meeting the use requirements of batteries of different specifications, and has good versatility. The setting of the through hole on the cover plate is conducive to the exposure of the output pole block; the setting of the explosion-proof valve is conducive to improving the safety of the battery. The liquid inlet channel, the liquid outlet channel and each connecting channel are all arranged along the axial extension of the accommodating cavity, which is convenient for layout and implementation, and has a good cooling effect.

[0019] In addition, another object of the present invention is to provide a battery cell, which includes the battery cell shell as described above.

[0020] The battery cell of the utility model is beneficial to improving the cooling effect of the battery cell by providing the above battery cell shell, thereby improving the safety of the battery cell.

[0021] In addition, the utility model also provides a battery pack, which includes the battery cell as described above.

[0022] The battery pack of the utility model, by providing the above-mentioned battery cells, is advantageous in eliminating the structure of the liquid cooling plate, thereby facilitating improving the electric capacity and safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 This is a disassembled diagram of the battery cell housing according to an embodiment of the utility model;

[0025] Figure 2 This is a schematic structural diagram of the first end of the housing body according to an embodiment of the present utility model;

[0026] Figure 3 This is a schematic structural diagram of the second end of the housing body according to an embodiment of the present utility model;

[0027] Figure 4 It is a schematic diagram of the structure of the outer shell in the unfolded state according to the embodiment of the utility model.

[0028] Description of reference numerals:

[0029] 1. Shell body; 2. Cover plate;

[0030] 100, accommodating cavity; 101, inner shell; 102, outer shell; 103, liquid inlet channel; 104, liquid outlet channel; 105, communication channel; 106, first connecting rib; 107, second connecting rib; 108, third connecting rib; 109, fourth connecting rib; 110, communication port;

[0031] 201, liquid inlet; 202, liquid outlet; 203, explosion-proof valve; 204, through hole; 205, liquid inlet pipe; 206, liquid outlet pipe;

[0032] A. First end; B. Second end. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0034] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0036] The present embodiment relates to a battery cell shell, which comprises a shell body 1 and a cover plate 2 in terms of overall structure. The shell body 1 has an internal accommodating chamber 100, a liquid inlet channel 103 and a liquid outlet channel 104 which are located on the periphery of the accommodating chamber 100 and are separated and arranged along the circumference of the accommodating chamber 100, and a plurality of connecting channels 105 which are arranged between the liquid inlet channel 103 and the liquid outlet channel 104 and are connected in sequence. The liquid inlet channel 103 and the liquid outlet channel 104 are respectively connected to the adjacent connecting channels 105, and are connected together through the plurality of connecting channels 105. The cover plate 2 is arranged at both ends of the shell body 1, and at least one of the cover plates 2 is provided with a liquid inlet 201 connected to the liquid inlet channel 103, and / or a liquid outlet 202 connected to the liquid outlet channel 104.

[0037] The cell shell of this embodiment facilitates the installation of the pole group or winding core by providing the accommodating cavity 100 in the shell body 1, and by providing the liquid inlet channel 103, the liquid outlet channel 104 and a plurality of connecting channels 105 on the periphery of the accommodating cavity 100, it facilitates the cooling medium to flow from the liquid inlet channel 103 through each connecting channel 105 in sequence and then flow into the liquid outlet channel 104, so as to cool the accommodating cavity 100 and have a good cooling effect. At the same time, compared with the solution of additionally arranging a liquid cooling plate, it can also reduce the space occupied in the battery pack and improve the energy density of the battery pack.

[0038] Based on the above overall introduction, the exemplary structure of the battery cell housing described in this embodiment is as follows Figure 1 As shown in . The battery cell shell is specifically a part of the cylindrical battery cell, and the accommodating cavity 100 is specifically used to install the winding core. As a preferred embodiment, the shell body 1 includes an inner shell 101 having an accommodating cavity 100, and an outer shell 102 sleeved outside the inner shell 101, and the inner shell 101 is connected to the outer shell 102 through a plurality of connecting ribs arranged at intervals along the circumference of the accommodating cavity 100.

[0039] A liquid inlet channel 103, a liquid outlet channel 104 and communication channels 105 are respectively formed between two adjacent connecting ribs and the cover plates 2 at both ends. Here, the structures of the inner shell 101, the outer shell 102 and the connecting ribs are simple and easy to arrange and implement.

[0040] As a preferred embodiment, each connecting rib is arranged to extend along the axial direction of the accommodating cavity 100, so that the liquid inlet channel 103, the liquid outlet channel 104 and each connecting channel 105 are arranged to extend along the axial direction of the accommodating cavity 100. Such an arrangement is not only convenient for arrangement and implementation, but also can improve the cooling effect of the entire housing body 1.

[0041] In terms of specific structure, Figure 2 and Figure 3 As shown in , the cross section of the inner shell 101 is circular, and the cross section of the outer shell 102 is square. There are four connecting ribs arranged at intervals along the circumference of the inner shell 101, and there are two connecting channels 105. For the convenience of distinguishing descriptions, the connecting rib separating the inlet channel 103 and the outlet channel 104 is called the first connecting rib 106, the connecting rib between the inlet channel 103 and the adjacent connecting channel 105 is called the second connecting rib 107, the connecting rib between two adjacent connecting channels 105 is called the third connecting rib 108, and the connecting rib between the outlet channel 104 and the adjacent connecting channel 105 is called the fourth connecting rib 109.

[0042] In this embodiment, the middle portion of the cover plate 2 is used to block the opening at the end of the accommodating cavity 100 , and the outer periphery of the cover plate 2 is used to block the openings at the ends of each channel to ensure that the cooling medium in the channel does not flow into the accommodating cavity 100 .

[0043] When implementing it, refer to Figures 2 to 4 As shown in the figure, two adjacent communication channels 105, as well as the inlet channel 103, the outlet channel 104 and the adjacent communication channels 105 are all connected through the communication openings 110. A plurality of communication openings 110 are alternately arranged at both ends of the shell body 1 along the circumference of the accommodating cavity 100, and the cooling medium flows from the inlet channel 103 through each communication channel 105 and then flows into the outlet channel 104. For the convenience of distinguishing descriptions, the end of the second connecting rib 107 having the communication opening 110 is referred to as the first end A of the connecting rib, and the other end of the accommodating cavity 100 is referred to as the second end B of the connecting rib.

[0044] Still combined Figures 2 to 4 As shown in , the communication port 110 on the second connecting rib 107 is arranged at its first end A, the communication port 110 on the third connecting rib 108 is arranged at its second end B, and the communication port 110 on the fourth connecting rib 109 is arranged at its first end A. In addition, the liquid inlet 201 communicating with the liquid inlet channel 103 is preferably arranged on the cover plate 2 arranged opposite to the communication port 110 on the second connecting rib 107. The liquid outlet 202 communicating with the liquid outlet channel 104 is preferably arranged on the cover plate 2 arranged opposite to the communication port 110 on the fourth connecting rib 109.

[0045] For example, the liquid inlet 201 and the liquid outlet 202 in this embodiment are arranged on the same cover plate 2. For the inflow and outflow of the cooling medium, a liquid inlet pipe 205 communicating with the liquid inlet 201 and a liquid outlet pipe 206 communicating with the liquid outlet 202 may also be arranged on the cover plate 2.

[0046] It should be noted that the number of connecting ribs in this embodiment can be adaptively increased or decreased according to the use requirements, as long as the arrangement specifications of the connecting ports 110 are met so that the cooling medium can flow around the outer peripheral wall of the accommodating cavity 100. In addition, it is also feasible to adopt other arrangements of the multiple connecting ports 110, in which case the cooling medium can also flow through the outer peripheral wall of the accommodating cavity 100, thereby achieving a better cooling effect.

[0047] In addition, in this embodiment, at least one of the length a, width b and height c of the shell body 1 satisfies: 200≤a≤1200mm, 20≤b≤100mm; 20≤c≤100mm. Such a configuration can meet the use requirements of batteries of different specifications and has good versatility. In specific implementation, the parameters of the length a, width b and height c of the shell body 1 can be determined according to the use requirements.

[0048] For example, the length a of the housing body 1 may be 200 mm, 300 mm, 400 mm, 500 mm, 600 mm, 700 mm, 800 mm, 900 mm, 1000 mm, 1100 mm, or 1200 mm, etc. The width b of the housing body 1 may be 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 700 mm, 80 mm, 90 mm, or 100 mm, etc. The height c of the housing body 1 may be 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 700 mm, 80 mm, 90 mm, or 100 mm, etc.

[0049] In this embodiment, a through hole 204 for the output pole block of the power core to pass through is provided on one cover plate 2, and an explosion-proof valve 203 is provided on the other cover plate 2 to communicate with the accommodating cavity 100. It can be understood that if the battery cell shell is a square battery cell shell, the through hole 204 and the explosion-proof valve 203 can be provided on the same cover plate 2 according to the use requirements.

[0050] In this embodiment, the cell shell is provided with a flow channel of the cooling medium on the shell body 1, which is beneficial to improving the cooling efficiency of the cell and can omit the liquid cooling plate in the traditional solution, thus having good practicality.

[0051] In addition, this embodiment also relates to a battery cell, which includes the battery cell shell as described above.

[0052] The battery cell described in this embodiment is beneficial to improving the cooling effect of the battery cell by providing the above battery cell housing, thereby improving the safety of the battery cell.

[0053] In addition, the present embodiment also relates to a battery pack, which includes the battery cell as described above.

[0054] The battery pack of this embodiment, by providing the above-mentioned battery cells, is advantageous in eliminating the structure of the liquid cooling plate, thereby facilitating improving the capacity and safety of the battery pack.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cell casing, characterized in that: It includes a shell body and a cover plate; The shell body has an accommodating cavity located inside, a liquid inlet channel and a liquid outlet channel located on the outer periphery of the accommodating cavity and separated and arranged along the circumferential direction of the accommodating cavity, and a plurality of communication channels arranged between the liquid inlet channel and the liquid outlet channel and connected in sequence, the liquid inlet channel and the liquid outlet channel are respectively connected to the adjacent communication channels, and are connected together through the plurality of communication channels; The cover plates are arranged at both ends of the shell body, and at least one of the cover plates is provided with a liquid inlet communicated with the liquid inlet channel, and / or a liquid outlet communicated with the liquid outlet channel.

2. The battery cell casing according to claim 1, characterized in that: Two adjacent communication channels, as well as the liquid inlet channel, the liquid outlet channel and the adjacent communication channels are all connected via a communication port; The plurality of communication ports are alternately arranged in sequence at both ends of the shell body along the circumferential direction of the accommodating cavity, and the cooling medium flows from the liquid inlet channel through each of the communication channels in a circuitous manner and then flows into the liquid outlet channel.

3. The battery cell casing according to claim 1, characterized in that: The housing body comprises an inner housing having the accommodating cavity, and an outer housing sleeved outside the inner housing, wherein the inner housing is connected to the outer housing via a plurality of connecting ribs arranged at intervals along the circumference of the accommodating cavity; The liquid inlet channel, the liquid outlet channel and the communicating channels are respectively formed between two adjacent connecting ribs and the cover plates at both ends.

4. The battery cell casing according to claim 3, characterized in that: The cross section of the inner shell is circular; and / or the cross section of the outer shell is square.

5. The battery cell casing according to claim 3, characterized in that: The number of the connecting ribs is four and they are arranged at intervals along the circumference of the inner shell.

6. The battery cell casing according to claim 1, characterized in that: At least one of the length a, width b and height c of the housing body satisfies: 200≤a≤1200mm, 20≤b≤100mm; 20≤c≤100mm.

7. The battery cell casing according to claim 1, characterized in that: The cover plate is provided with a through hole for the output pole block of the power supply core to pass through; and / or, Another cover plate is provided with an explosion-proof valve which is communicated with the accommodating cavity.

8. The battery cell casing according to any one of claims 1 to 7, characterized in that: The liquid inlet channel, the liquid outlet channel and each of the communication channels are all extended along the axial direction of the accommodating cavity.

9. A battery cell, characterized in that: A battery cell casing comprising the battery cell casing according to any one of claims 1 to 8.

10. A battery pack, characterized in that: Comprising the battery cell as claimed in claim 9.

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