Cylindrical battery module and vehicle

By designing the symmetrical safety gap between the exhaust slot on the bottom bracket and the nickel alloy positive electrode connecting plate in the cylindrical battery module, the problem of exhaust design of the battery explosion-proof valve is solved, and the battery is exhausted separately and the battery is short-circuited and fused, reducing the Secondary damage risk and insurance design cost.

CN222146491UActive Publication Date: 2024-12-10安徽得壹能源科技有限公司
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Patent Information

Application Number
CN202323409284.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-13
Publication Date
2024-12-10
Estimated Expiration
2033-12-13

AI Technical Summary

Technical Problem

The exhaust design of the battery explosion-proof valve in the existing cylindrical battery module goes downward, resulting in high-temperature and high-pressure gas or flames that may cause chain reactions and secondary damage. The busbar connection design has the problem of battery cell short circuit bonding, which is expensive to maintain. Difficult to apply on a large scale.

Method used

An exhaust structure with exhaust grooves and exhaust holes on the bottom bracket is designed to ensure that each battery is exhausted separately, and a safety gap is symmetrically set on both sides of the positive electrode connecting plate. The material is made of nickel alloy, which can be fused and cut off the battery connection to Prevent secondary damage.

Benefits of technology

The upper exhaust design of the cylindrical battery module is realized, avoiding the influence of high-temperature and high-pressure gas or flames to the next battery, timely cut off the battery connection, reduce the risk of secondary damage, and reduce the cost through the instantaneous fuse of the nickel alloy safety gap.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model particularly relates to a cylindrical battery module and a vehicle. The cylindrical battery module comprises a bottom layer support, a plurality of exhaust grooves are evenly distributed in the bottom layer support and communicated with the exhaust holes, first battery limiting grooves are formed in the bottoms of the exhaust grooves, battery limiting bottom pieces are fixedly connected to the bottoms of the first battery limiting grooves, and the diameter of the exhaust grooves is larger than that of the first battery limiting grooves. The top of the bottom layer support is connected with the exhaust layer support, a plurality of second battery limiting grooves are evenly distributed in the exhaust layer support, the arrangement positions of the first battery limiting grooves correspond to the arrangement positions of the second battery limiting grooves in a one-to-one mode, a plurality of exhaust channels are formed in the bottom of the exhaust layer support, and the exhaust holes are communicated with the exhaust channels. And a cylindrical battery is placed in the second battery limiting groove, penetrates through the second battery limiting groove and the first battery limiting groove and is connected with the battery limiting bottom sheet. According to the utility model, the exhaust direction of the cylindrical batteries and the structure of the exhaust channel are optimized, and each cylindrical battery exhausts independently without mutual influence.
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Description

Technical Field

[0001] The utility model relates to the field of power batteries, and in particular to a cylindrical battery module and a vehicle. Background Art

[0002] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the utility model, and shall not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field.

[0003] Compared with traditional fuel vehicles, electric vehicles have the advantages of energy saving and environmental protection, low use and maintenance costs, and high intelligence, so they are increasingly favored by consumers. As the power core of electric vehicles, batteries are a very important part of the entire electric vehicle. In the development of power batteries, they are mainly classified by shape into cylindrical batteries, square batteries and soft-pack batteries, among which cylindrical batteries are used more and more. There are various forms of cylindrical battery modules, but the exhaust of the battery explosion-proof valve in the cylindrical battery module is currently designed downward. At the same time, the exhaust at the bottom of many battery modules is connected. There is a problem that the high-temperature and high-pressure gas or flame generated by the explosion of the explosion-proof valve of a battery cell affects the battery next to it, thereby causing a chain reaction or secondary damage. At the same time, in the prior art, in order to meet the overcurrent of the battery, the cylindrical battery adopts the form of busbar connection, but the busbar of the cylindrical battery has the problem of short-circuit bonding of the battery cell. In order to improve safety, a complex and expensive insurance design is usually adopted, but the cost of its insurance design is too high and is not suitable for large-scale application in factories. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a cylindrical battery module and a vehicle. In the utility model, the exhaust direction of the cylindrical battery and the structure of the exhaust channel are optimized, so that each cylindrical battery can be exhausted separately without affecting each other. At the same time, the symmetrically designed safety gaps on both sides of the positive electrode connecting piece in the utility model can instantly fuse when the battery is short-circuited, cutting off the connection between the batteries, protecting other batteries and preventing secondary damage.

[0005] In a first aspect of the utility model, a cylindrical battery module is provided, comprising a bottom bracket, a plurality of exhaust grooves are evenly distributed on the bottom bracket, the exhaust grooves are communicated with exhaust holes, a first battery limiting groove is arranged at the bottom of the exhaust groove, a battery limiting bottom sheet is fixedly connected to the bottom of the first battery limiting groove, and a diameter of the exhaust groove is greater than a diameter of the first battery limiting groove;

[0006] The top of the bottom bracket is connected to the exhaust layer bracket, a plurality of second battery limiting grooves are evenly distributed on the exhaust layer bracket, the layout positions of the first battery limiting grooves correspond to the layout positions of the second battery limiting grooves one by one, a plurality of exhaust channels are arranged at the bottom of the exhaust layer bracket, and the exhaust holes are connected to the exhaust channels;

[0007] A cylindrical battery is placed in the second battery limiting groove, and the cylindrical battery passes through the second battery limiting groove and the first battery limiting groove and is connected to the battery limiting bottom plate.

[0008] According to a further technical solution, the electrodes of multiple cylindrical batteries are connected in series via a series busbar.

[0009] Preferably, the series busbar includes multiple groups of connection units, each of which includes a positive electrode connection sheet and a negative electrode connection sheet. Safety notches are symmetrically arranged on both sides of the middle of the positive electrode connection sheet, and the bottom of the positive electrode connection sheet is connected to the negative electrode connection sheet; the negative electrode connection sheets in the connection unit are connected to each other.

[0010] Preferably, the positive electrode connecting piece is made of nickel alloy. The cross-sectional area of ​​the insurance gap is reduced, so that the gap can be instantly melted when the battery is short-circuited, cutting off the connection between the batteries, protecting other batteries and preventing secondary damage.

[0011] Further preferably, the positive electrode connecting piece is connected to the positive electrode of the cylindrical battery, and the negative electrode connecting piece is connected to the negative electrode of the cylindrical batteries connected in series.

[0012] According to a further technical solution, the positive and negative electrodes at the head and tail of the cylindrical battery module are connected to the positive output busbar and the negative output busbar respectively.

[0013] Preferably, the positive output busbar includes a plurality of positive connecting plates, and the positive connecting plates are connected to the positive terminal connecting ends.

[0014] Preferably, the negative output busbar includes a plurality of negative connecting plates, and the negative connecting plates are connected to the negative terminal connecting ends.

[0015] A further technical solution is that in order to fix the cylindrical battery, the exhaust layer bracket is connected to the potting rubber layer, and a plurality of third battery limiting grooves are evenly distributed on the potting rubber layer. The layout positions of the third battery limiting grooves correspond one-to-one with the layout positions of the second battery limiting grooves, and the diameter of the third battery limiting grooves is the same as the diameter of the cylindrical battery.

[0016] According to a further technical solution, the diameters of the first battery limiting groove and the second battery limiting groove are the same and slightly larger than the diameter of the cylindrical battery, so that the cylindrical battery can just be loaded therein.

[0017] According to a further technical solution, the bottom of the bottom bracket is connected to the bottom plate of the cylindrical battery module to protect the cylindrical battery module.

[0018] A second aspect of the present invention provides an electric vehicle comprising the cylindrical battery module.

[0019] The beneficial effects of the utility model are:

[0020] (1) The utility model provides a plurality of exhaust grooves evenly distributed on the bottom bracket, each exhaust groove is connected to a separate exhaust hole, and the exhaust hole is connected to the exhaust channel of the top exhaust layer bracket, so that the exhaust of the cylindrical battery module is designed to be upward. At the same time, the exhaust of a single battery in the cylindrical battery module is not connected, which solves the problem that the high-temperature and high-pressure gas or flame generated by the explosion of the explosion-proof valve of a battery cell affects the batteries next to it.

[0021] (2) The positive electrode connecting piece provided by the utility model has safety notches symmetrically arranged on both sides of the middle, and the material of the positive electrode connecting piece is nickel alloy. The cross-sectional area at the safety notch becomes smaller, so that the notch can be instantly melted when the battery is short-circuited, thereby cutting off the connection between the batteries, protecting other batteries and preventing secondary damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute 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.

[0023] Figure 1 This is a schematic diagram of the structure of the cylindrical battery module in Example 1;

[0024] Figure 2 This is a schematic diagram of the exploded structure of the cylindrical battery module in Example 1;

[0025] Figure 3 This is a schematic diagram of the structure of the bottom bracket in the cylindrical battery module in Example 1;

[0026] Figure 4 This is a schematic diagram of the structure of the exhaust layer support in the cylindrical battery module in Example 1;

[0027] Figure 5 This is a schematic diagram of the structure of the series-connected busbars in the cylindrical battery module in Example 1;

[0028] Among them, 1-positive output busbar, 2-cylindrical battery, 3-potting glue layer, 4-exhaust layer bracket, 5-exhaust channel, 6-series busbar, 7-negative output busbar, 8-bottom bracket, 9-cylindrical battery module bottom plate, 10, third battery limiting groove, 4.1 potting glue layer limiting plate, 4.2 second battery limiting groove, 4.3-exhaust channel, 6.1-positive electrode connecting piece, 6.11-safety notch, 6.2-negative electrode connecting piece, 8.1-exhaust groove, 8.2-first battery limiting groove, 8.3-exhaust hole, 8.4-battery limiting bottom plate. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] The present invention will be further described in detail below in conjunction with specific embodiments. It should be noted that the specific embodiments are intended to explain the present invention rather than to limit it.

[0032] Example 1

[0033] See also Figure 2 A cylindrical battery module comprises a bottom bracket 8, a plurality of exhaust grooves 8.1 are evenly distributed on the bottom bracket, the exhaust grooves 8.1 are connected to the exhaust holes 8.3, a first battery limiting groove 8.2 is arranged at the bottom of the exhaust groove 8.1, a battery limiting bottom plate 8.4 is fixed to the bottom of the first battery limiting groove 8.2, and the diameter of the exhaust groove 8.1 is greater than the diameter of the first battery limiting groove 8.2; (see Figure 3 );

[0034] See also Figure 4 The top of the bottom bracket 8 is connected to the exhaust layer bracket 4, and a plurality of second battery limiting grooves 4.2 are evenly distributed on the exhaust layer bracket 4. The layout positions of the first battery limiting grooves 8.2 correspond to the layout positions of the second battery limiting grooves 4.2 one by one. A plurality of exhaust channels 5 are arranged at the bottom of the exhaust layer bracket 4, and the exhaust holes 8.3 are connected to the exhaust channels 5;

[0035] The cylindrical battery 2 is placed in the second battery limiting groove 4.2, and the cylindrical battery 2 passes through the second battery limiting groove 4.2 and the first battery limiting groove 8.2 and is connected to the battery limiting bottom plate 8.4.

[0036] See also Figure 5 , the electrodes of multiple cylindrical batteries 2 are connected in series through a series busbar 6; the series busbar 6 includes multiple groups of connection units, the connection units include a positive electrode connection sheet 6.1 and a negative electrode connection sheet 6.2, and the middle two sides of the positive electrode connection sheet 6.1 are symmetrically provided with a safety notch 6.11, and the bottom of the positive electrode connection sheet 6.1 is connected to the negative electrode connection sheet 6.2; the negative electrode connection sheets 6.2 in the connection unit are connected to each other. The material of the positive electrode connection sheet 6.1 is nickel alloy. The cross-sectional area at the safety notch 6.11 becomes smaller, so that the notch can be instantly melted when the battery is short-circuited, cutting off the connection between the batteries, protecting other batteries and preventing secondary damage. The positive electrode connection sheet 6.1 is connected to the positive electrode of the cylindrical battery 2, and the negative electrode connection sheet 6.2 is connected to the negative electrode of the cylindrical battery 2 connected in series.

[0037] The positive and negative electrodes at the head and tail of the cylindrical battery module are connected to the positive output busbar 1 and the negative output busbar 7 respectively. The positive output busbar 1 includes a plurality of positive connecting pieces 6.1, which are connected to the positive terminal connection end. The structure and material of the positive connecting piece 6.1 in the positive output busbar 1 are exactly the same as those of the positive connecting piece 6.1 in the series busbar 6. Safety notches 6.1 are symmetrically arranged on both sides of the middle of the positive connecting piece 6.1, and the material of the positive connecting piece 6.1 is nickel alloy. The negative output busbar 7 includes a plurality of negative connecting pieces 6.2, which are connected to the negative terminal connection end. The positive output busbar and the negative output busbar are in a stepped structure, the lower step is for connecting the positive and negative terminal connection ends of the cylindrical battery module, and the upper step is the positive connecting piece or the negative connecting piece.

[0038] In order to fix the cylindrical battery, the exhaust layer bracket 4 is connected to the potting glue layer 3, and a plurality of third battery limiting grooves 10 are evenly distributed on the potting glue layer 3. The layout positions of the third battery limiting grooves 10 correspond one-to-one to the layout positions of the second battery limiting grooves 4.2, and the diameter of the third battery limiting grooves 10 is the same as the diameter of the cylindrical battery 2. Here, the potting glue layer 3 is used to pot the battery after placing it in the second battery limiting groove 4.2. Therefore, the exhaust layer bracket 4 is surrounded by a potting glue layer limiting plate 4.1, and the diameter of the third battery limiting groove 10 is the same as the diameter of the cylindrical battery 2, which has a good fixing effect. Since the diameter of the second battery limiting groove 4.2 can just hold the cylindrical battery 2, the potting glue will not enter the second battery limiting groove 4.2.

[0039] The diameters of the first battery limiting groove 8.2 and the second battery limiting groove 4.2 are the same, and slightly larger than the diameter of the cylindrical battery 2, so that the cylindrical battery 2 can be just inserted.

[0040] The bottom of the bottom bracket 8 is connected to the bottom plate 9 of the cylindrical battery module to protect the cylindrical battery module.

[0041] The structural schematic diagram of the cylindrical battery module after final assembly of this embodiment is as follows Figure 1 shown.

[0042] This embodiment also provides an electric vehicle, comprising the above cylindrical battery module.

[0043] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of them with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A cylindrical battery module, characterized in that: The bottom bracket comprises a plurality of exhaust grooves evenly distributed on the bottom bracket, the exhaust grooves are communicated with the exhaust holes, a first battery limiting groove is arranged at the bottom of the exhaust groove, a battery limiting bottom sheet is fixedly connected to the bottom of the first battery limiting groove, and a diameter of the exhaust groove is larger than a diameter of the first battery limiting groove; The top of the bottom bracket is connected to the exhaust layer bracket, a plurality of second battery limiting grooves are evenly distributed on the exhaust layer bracket, the layout positions of the first battery limiting grooves correspond to the layout positions of the second battery limiting grooves one by one, a plurality of exhaust channels are arranged at the bottom of the exhaust layer bracket, and the exhaust holes are connected to the exhaust channels; A cylindrical battery is placed in the second battery limiting groove, and the cylindrical battery passes through the second battery limiting groove and the first battery limiting groove and is connected to the battery limiting bottom plate.

2. The cylindrical battery module according to claim 1, characterized in that: The electrodes of multiple cylindrical batteries are connected in series via a series busbar.

3. The cylindrical battery module according to claim 2, characterized in that: The series busbar includes multiple groups of connection units, each of which includes a positive electrode connection sheet and a negative electrode connection sheet. Safety notches are symmetrically arranged on both sides of the middle of the positive electrode connection sheet, and the bottom of the positive electrode connection sheet is connected to the negative electrode connection sheet; the negative electrode connection sheets in the connection unit are connected to each other.

4. The cylindrical battery module according to claim 3, characterized in that: The positive electrode connecting piece is connected to the positive electrode of the cylindrical battery, and the negative electrode connecting piece is connected to the negative electrode of the cylindrical batteries connected in series.

5. The cylindrical battery module according to claim 1, characterized in that: The positive and negative electrodes at the head and tail of the cylindrical battery module are connected to the positive output busbar and the negative output busbar respectively.

6. The cylindrical battery module according to claim 5, characterized in that: The positive output busbar includes a plurality of positive connecting plates, and the positive connecting plates are connected to the positive terminal connecting ends.

7. The cylindrical battery module according to claim 5, characterized in that: The negative output busbar includes a plurality of negative connecting plates, and the negative connecting plates are connected to the negative terminal connecting ends.

8. The cylindrical battery module according to claim 1, characterized in that: The exhaust layer bracket is connected to the potting rubber layer, and a plurality of third battery limiting grooves are evenly distributed on the potting rubber layer. The layout positions of the third battery limiting grooves correspond one-to-one with the layout positions of the second battery limiting grooves, and the diameter of the third battery limiting grooves is the same as the diameter of the cylindrical battery.

9. The cylindrical battery module according to claim 1, characterized in that: The bottom of the bottom bracket is connected to the bottom plate of the cylindrical battery module and is used to protect the cylindrical battery module.

10. An electric vehicle, characterized in that: A cylindrical battery module comprising any one of claims 1 to 9.