Battery module with pressure detection function

Abstract

The utility model discloses a battery module with a pressure detection function, which comprises a battery cell component, a plurality of battery cells and an end plate, and the plurality of battery cells are sequentially stacked along an arrangement direction; the end plates cover the outmost battery cells in the arrangement direction in a sealing manner; the partition plates are arranged between every two adjacent battery cells in the arrangement direction; and the pressure detector is used for detecting the pressure of the battery cell. According to the battery module with the pressure detection function, disclosed by the utility model, the pressure detector is arranged to detect the pressure change of the battery cell when the battery cell is deformed so as to monitor the expansion condition of the battery cell of the battery module.

Description

Technical Field

[0001] The utility model relates to the technical field of battery modules, in particular to a battery module with pressure detection. Background Art

[0002] With the rapid development of electric vehicles, electric bicycles, energy storage and other technologies, lithium batteries have been used more and more widely, but safety issues have become more and more prominent. When the battery cells of the battery module are in use, the high temperature of the cells can easily cause the cells to expand, resulting in lithium battery explosions and fires.

[0003] The traditional method of monitoring battery usage status is to monitor the temperature by voltage and current, or by temperature detection. The measurement is relatively easy, but the precision and accuracy of predicting battery failure are not satisfactory. Utility Model Content

[0004] In order to overcome at least one defect of the above-mentioned prior art, the utility model provides a battery module with pressure detection, which detects the pressure change of the battery cell when it is deformed by setting a pressure detector to monitor the expansion of the battery cell of the battery module.

[0005] The technical solution adopted by the utility model to solve the problem is:

[0006] A battery module with pressure detection, comprising:

[0007] A battery cell assembly comprises a plurality of battery cells and an end plate, wherein the plurality of battery cells are stacked in sequence along an arrangement direction; the end plate is sealed outside the outermost battery cell in the arrangement direction;

[0008] A partition, wherein the partition is provided between two adjacent battery cells in the arrangement direction, and the partition is used to cool the battery cells;

[0009] A pressure detector is used to detect the pressure of the battery cell.

[0010] Furthermore, the pressure detector is mounted on the end plate.

[0011] Furthermore, the pressure detector is installed on the side of the end plate facing the battery cell.

[0012] Furthermore, the end plates are provided on both sides of the arrangement direction; and the two end plates are respectively sealed outside the outermost battery cells in the arrangement direction.

[0013] Furthermore, the pressure detector is installed on the partition.

[0014] Furthermore, the pressure detector is installed on the battery cell; the pressure detector is installed on the side of the battery cell located in the arrangement direction.

[0015] Furthermore, the pressure detector is provided with one or more.

[0016] Furthermore, the pressure detector is a pressure sensor.

[0017] Furthermore, a plurality of cooling channels are provided in the partition, and the plurality of cooling channels are distributed at intervals in the height direction of the partition.

[0018] Furthermore, the battery module also includes a battery steel belt, which is sleeved on the outer periphery of the battery cell assembly to fix the plurality of battery cells and the end plates in the arrangement direction.

[0019] To sum up, the utility model has the following technical effects: when the battery is overcharged, overheated or micro-short-circuited, the battery cells inside the battery module expand and squeeze the battery cells. The pressure of the battery cells changes after being squeezed. When the internal pressure begins to increase, the pressure detector can detect the pressure change of the battery cells. When the pressure value detected by the pressure detector reaches the set value of the battery management system, the battery management system can send an early warning, which can effectively avoid the occurrence of battery explosion and improve the safety of battery module use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a battery module of the utility model;

[0021] Figure 2 This is a schematic diagram of the exploded structure of the battery module of the present utility model;

[0022] Figure 3 A cross-sectional view of a battery module of the present utility model;

[0023] Figure 4 It is a structural schematic diagram of the partition of the utility model.

[0024] Among them, the meanings of the figure numbers are as follows: 10, battery cell; 11, conductive bar; 20, end plate; 30, partition; 31, cooling channel; 40, battery steel strip; 50, pressure detector. DETAILED DESCRIPTION

[0025] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0028] See also Figure 1-Figure 4 The utility model discloses a battery module with pressure detection, including a battery cell 10 assembly, a partition 30 and a pressure detector 50. The battery cell 10 assembly includes a plurality of battery cells 10 and an end plate 20. The plurality of battery cells 10 are stacked in sequence along an arrangement direction. The end plate 20 is sealed outside the outermost battery cell 10 in the arrangement direction, so that the plurality of battery cells 10 form a battery module in the stacking direction. A partition 30 is provided between two adjacent battery cells 10 in the arrangement direction, and a cooling channel 31 is provided in the partition 30. A cooling fluid can be introduced into the cooling channel 31 to cool the battery cell 10. The pressure detector 50 can detect the pressure of the battery cell 10.

[0029] On the basis of the above structure, when using the battery module with pressure detection of the utility model, when the battery module is assembled, several battery cells 10 can be arranged and stacked in sequence, and then the outermost end plate 20 is used to fix the several battery cells 10, and the electrodes of two adjacent battery cells 10 are electrically connected through the conductive bus 11, and then the electrical equipment can be connected to the battery module.

[0030] During the use of the battery module, the battery cells 10 are prone to generate high temperatures, so a partition 30 is set between two adjacent battery cells 10, and a cooling fluid is introduced into the cooling channel 31 in the partition 30 to cool the battery cells 10. This reduces the high temperature of the battery cells 10 during the use of the battery module, so that the temperature of the battery module will not rise too quickly during the use of the battery module, and the use safety is better.

[0031] In addition, since the structural changes of the battery cell 10 represent the battery characteristics, and the representation of the structural changes of the battery cell 10 is the pressure of the battery. There are many reasons for the failure of the battery cell 10, such as overcharging, overheating or micro-short circuit, but no matter what the reason, the internal pressure increases before the battery explodes, increases to a certain threshold, the battery structure is damaged, and the explosion occurs. Therefore, in this application, when the battery is overcharged, overheated or micro-short-circuited, the battery cell 10 inside the battery module expands, which will squeeze the battery cell 10. After the battery cell 10 is squeezed, the pressure changes. When the internal pressure begins to increase, the pressure detector 50 can detect the pressure change of the battery cell 10. When the pressure value detected by the pressure detector 50 reaches the set value of the battery management system, the battery management system can send an early warning, which can effectively avoid the occurrence of battery explosion and improve the safety of battery module use.

[0032] It should be noted that the end plate 20 may be an end cover or a side plate of a battery housing. In short, any structure that can be stacked on the battery cells 10 and abut against the outermost side of the battery module may be used, so that several battery cells, partitions and end plates can remain in a close fit after assembly, ensuring that the battery expansion and extrusion force can be transmitted in sequence, so that the pressure detector can accurately detect.

[0033] Of course, in addition to providing cooling channels inside the partitions to introduce cooling fluid for cooling, the partitions can also be cooled by providing a cooling material layer on the partitions. The specific cooling method of the partitions is selected according to actual needs.

[0034] In addition, the partition is made of insulating material, which can separate two adjacent battery cells and prevent short circuit between the two battery cells.

[0035] Furthermore, the pressure detector 50 is mounted on the end plate 20. If the battery cell 10 expands and deforms due to high temperature during use, the internal pressure of the battery increases, and the shell or packaging deforms, the pressure detector 50 disposed on the end plate 20 can detect the squeezing force of the battery cell 10.

[0036] More specifically, the pressure detector 50 is installed on the side of the end plate 20 facing the battery cell 10. When the battery cell 10 expands, the extrusion pressure generated by the expansion is transmitted from the inside to the outside. Therefore, in this embodiment, the pressure detector 50 is arranged on the side facing the battery cell 10. This can more quickly receive the deformation extrusion pressure of the battery cell 10, and the detection structure of the pressure detector 50 is faster and more accurate.

[0037] Of course, the pressure detector 50 can also be set on the side of the end plate 20 away from the battery cell 10. In this way, when the battery cell 10 expands and squeezes, force is applied to the inner side of the end plate 20 and then transmitted to the outer side. In this way, there will be a delay in pressure detection, resulting in inaccurate and in-time detection.

[0038] In addition, compared with the case where the pressure detector 50 is installed on the outside of the end plate 20 , the pressure detector 50 is installed on the inside of the end plate 20 to prevent damage caused by exposure of electrical components, thereby increasing the service life of the pressure detector 50 .

[0039] Furthermore, end plates 20 may be provided on both sides of the arrangement direction of the above-mentioned battery cells 10, and the two end plates 20 are respectively sealed on the outside of the outermost battery cells 10 in the arrangement direction, that is, the two end plates 20 are used to encapsulate a number of battery cells 10 to the inside on both sides of the battery cells 10 in the arrangement direction, so that the battery cells 10, the partitions 30 and the end plates 20 are all tightly fitted, so that the expansion and deformation of any battery cell 10 in the arrangement direction can be transmitted to each other, thereby causing pressure changes, so that the detection result of the pressure detection sensor is more accurate.

[0040] Furthermore, in addition to being installed at the end plate 20, the pressure detector 50 can also be installed on the partition 30. In this way, the pressure sensor on the partition 30 can directly receive the deformation pressure generated by the expansion of the battery cell 10, accurately detect the pressure change of the battery cell 10, and the pressure detection result is accurate.

[0041] Furthermore, the above-mentioned pressure detector 50 can also be installed on the battery cell 10, and the pressure detector 50 is installed on the side of the battery cell 10 in the arrangement direction. Since the battery cell 10 deforms and expands to squeeze the adjacent battery cell 10, and the squeezing is performed in the arrangement direction, the pressure detector 50 is set on the side of the battery cell 10. It can directly receive the deformation pressure caused by the expansion of the battery cell 10, accurately detect the pressure change of the battery cell 10, and the pressure detection result is accurate.

[0042] Furthermore, one or more pressure detectors 50 are provided. Specifically, pressure sensors can be added to the end cap and each battery cell 10 to achieve more reliable results.

[0043] It should be noted that the location and number of the pressure detectors 50 can be selected and set according to actual needs, as long as they can accurately detect the expansion pressure of the battery cell 10 .

[0044] Furthermore, the pressure detector 50 is a pressure sensor. Specifically, the pressure sensor can be a traditional mechanical pressure sensor in the prior art, or an electronic pressure sensor. After the pressure sensor obtains the pressure value signal, it can be sent to the battery management system (BMS) for processing and measurement. It can also be directly sent to the early warning system of the battery module. When abnormal pressure is detected, an early warning signal is issued to remind the user of danger and allow maintenance personnel to handle it immediately to avoid accidents.

[0045] Of course, the above-mentioned battery management system and battery module early warning system are existing technologies and can be implemented by control chips, processors, etc. in the existing technology. They do not belong to the technical content to be protected by this application and will not be described in detail here.

[0046] Further, see Figure 4 The partition 30 is provided with a plurality of cooling channels 31, which are spaced apart in the height direction of the partition 30. Since the partition 30 is provided with a plurality of cooling channels 31, the cooling fluid can be introduced at different positions in the height direction of the partition 30, so that the side of the battery cell 10 can be cooled from top to bottom, and the cooling surface is large, so that rapid cooling can be achieved. In addition, the cooling positions are evenly distributed, the cooling effect is even, and the local temperature can be effectively prevented from being too high.

[0047] Furthermore, the battery module also includes a battery steel belt 40, which is sleeved on the outer periphery of the battery cell 10 assembly to fix the battery cells 10 and the end plates 20 in the arrangement direction. Specifically, the battery steel belt 40 can be fixed on the end plate 20 or the battery cell 10 shell by screws, or can be fixed by bundling or bonding. In short, after the battery steel belt 40 is assembled to the outside of the battery cells 10 and the end plates 20, the battery cells 10 and the end plates 20 can be kept in close contact and are not prone to loosening, thereby reducing the expansion of the battery cells 10 and causing incorrect pressure transmission due to the assembly gap.

[0048] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A battery module with pressure detection, characterized in that: include, A battery cell assembly comprises a plurality of battery cells and an end plate, wherein the plurality of battery cells are stacked in sequence along an arrangement direction; the end plate is sealed outside the outermost battery cell in the arrangement direction; A partition, wherein the partition is provided between two adjacent battery cells in the arrangement direction; A pressure detector is used to detect the pressure of the battery cell.

2. The battery module with pressure detection according to claim 1, characterized in that: The pressure detector is mounted on the end plate.

3. The battery module with pressure detection according to claim 2, characterized in that: The pressure detector is installed on the side of the end plate facing the battery core.

4. The battery module with pressure detection according to claim 2, characterized in that: The end plates are arranged on both sides of the arrangement direction; the two end plates are respectively sealed outside the outermost battery cells in the arrangement direction.

5. The battery module with pressure detection according to claim 1, characterized in that: The pressure detector is mounted on the partition plate.

6. The battery module with pressure detection according to claim 1, characterized in that: The pressure detector is installed on the battery cell; the pressure detector is installed on the side of the battery cell located in the arrangement direction.

7. The battery module with pressure detection according to claim 6, characterized in that: The pressure detector is provided with one or more.

8. The battery module with pressure detection according to any one of claims 1 to 7, characterized in that: The pressure detector is a pressure sensor.

9. The battery module with pressure detection according to any one of claims 1 to 7, characterized in that: A plurality of cooling channels are arranged in the partition, and the plurality of cooling channels are distributed at intervals in the height direction of the partition.

10. The battery module with pressure detection according to any one of claims 1 to 7, characterized in that: The battery module also includes a battery steel belt, which is sleeved on the outer periphery of the battery cell assembly to fix the plurality of battery cells and the end plates in the arrangement direction.

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