Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack, the battery module comprises: a plurality of battery cell groups which are arranged in sequence along a first direction, each battery cell group comprises a plurality of battery cells which are arranged in sequence along a second direction, and an included angle is formed between the first direction and the second direction; the first temperature sensors are connected with the battery cells to monitor the temperature of the battery cells, and the number of the first temperature sensors is smaller than that of the battery cells. By applying the technical scheme of the utility model, the technical problem of high production cost of the battery can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery modules, and particularly relates to a battery module and a battery pack. Background Art

[0002] With the development of the energy storage industry, energy storage batteries, as key equipment on the grid side, have received increasing attention. However, during the use of energy storage batteries, battery heating is an inevitable problem. To avoid battery safety issues, reduce the impact of energy storage battery heating on battery performance, and improve the safety and stability of energy storage batteries, it has become crucial to adopt battery thermal management strategies.

[0003] In the related art, temperature detection elements are usually used to monitor the temperature of the battery. If all battery cells are monitored for temperature, a relatively large number of temperature detection units are required, which will increase the volume and production cost of the battery, thus being unfavorable for the mass production of the battery. Summary of the Utility Model

[0004] Embodiments of the utility model provide a battery module and a battery pack, which can improve the technical problem of high battery production cost.

[0005] In a first aspect, embodiments of the utility model provide a battery module, which includes: a plurality of cell groups arranged in sequence along a first direction, each cell group includes a plurality of cells arranged in sequence along a second direction, and there is an included angle between the first direction and the second direction; a plurality of first temperature sensors, the first temperature sensors are connected to the cells to monitor the temperature of the cells, and the number of the first temperature sensors is less than the number of the cells.

[0006] In an embodiment, the battery module further includes: a second temperature sensor; a first output terminal; a second output terminal, with a polarity opposite to that of the first output terminal, and the second temperature sensor is connected to the first output terminal and / or the second output terminal to monitor the temperature of the first output terminal and / or the second output terminal.

[0007] In an embodiment, the distance between two adjacent first temperature sensors in the first direction is L1, and 90mm ≤ L1 ≤ 110mm.

[0008] In an embodiment, the distance between two adjacent first temperature sensors in the second direction is L2, and 90mm ≤ L2 ≤ 110mm.

[0009] In an embodiment, there is at least one cell between two adjacent first temperature sensors arranged along the second direction.

[0010] In an embodiment, two adjacent first temperature sensors arranged along the first direction are respectively connected to pole columns with different polarities.

[0011] In one embodiment, the battery module further includes a connecting piece, the connecting piece is disposed on the battery cell, the pole columns of two adjacent battery cells are electrically connected through the connecting piece, and the first temperature sensor is connected to the connecting piece.

[0012] In one embodiment, the first temperature sensor is fixedly welded or adhesively fixed to the connecting piece.

[0013] In one embodiment, the first temperature sensor and the second temperature sensor include a thermistor sensor or a temperature sensing chip.

[0014] In one embodiment, the included angle between the first direction and the second direction is a right angle.

[0015] In a second aspect, an embodiment of the present invention provides a battery pack, the battery pack includes: a battery box body having a receiving cavity; the above-mentioned battery module, and the battery module is disposed in the receiving cavity.

[0016] Applying the technical solution of the present invention, a first temperature sensor is disposed on the battery cell, and the number of the first temperature sensors is set to be less than the number of battery cells. In this way, not only can the temperature of the battery cell be monitored to reduce the risk of overheating and out-of-control of the battery cell, but also the production cost of the battery module can be reduced to a certain extent, so as to facilitate the mass production of the battery module and achieve the purpose of cost reduction and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 is a schematic structural diagram of a first embodiment of a battery pack provided by an embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of a second embodiment of a battery pack provided by an embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of a third embodiment of a battery pack provided by an embodiment of the present invention;

[0021] Figure 4 is a schematic structural diagram of a fourth embodiment of a battery pack provided by an embodiment of the present invention;

[0022] Figure 5 is a schematic structural diagram of a battery module provided by an embodiment of the present invention.

[0023] Among them, the above-mentioned drawings include the following reference numerals:

[0024] 1. Battery module;

[0025] 10. Cell group; 11. Cell;

[0026] 20. First temperature sensor;

[0027] 30. Second temperature sensor;

[0028] 40. First output terminal;

[0029] 50. Second output terminal;

[0030] 60. Connecting piece;

[0031] 70. Battery box;

[0032] X. First direction; Y. Second direction. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0034] As Figures 1 to 5 shown, in a first aspect, an embodiment of the present invention provides a battery module 1, and the battery module 1 includes: a plurality of cell groups 10 arranged in sequence along a first direction, each cell group 10 includes a plurality of cells 11 arranged in sequence along a second direction, and there is an included angle between the first direction and the second direction; a plurality of first temperature sensors 20, the first temperature sensors 20 are connected to the cells 11 to monitor the temperature of the cells 11, and the number of the first temperature sensors 20 is less than the number of the cells 11.

[0035] Applying the technical solution of the present invention, the first temperature sensors 20 are arranged on the cells 11, and the number of the first temperature sensors 20 is set to be less than the number of the cells 11. In this way, not only can the temperature of the cells 11 be monitored to reduce the risk of overheating and out-of-control of the cells 11, but also the production cost of the battery module 1 can be reduced to a certain extent, so as to facilitate the mass production of the battery module 1 and achieve the purpose of cost reduction and efficiency improvement.

[0036] In one embodiment, the battery module 1 further includes: a second temperature sensor 30; a first output terminal 40; a second output terminal 50, having a polarity opposite to that of the first output terminal 40. The second temperature sensor 30 is connected to the first output terminal 40 and / or the second output terminal 50 to monitor the temperature of the first output terminal 40 and / or the second output terminal 50. In the present application, the first output terminal 40 is the positive terminal, and the second output terminal 50 is the negative terminal. The first output terminal 40 and the second output terminal 50 are respectively used to connect to an external component to form a circuit. The second temperature sensor 30 is used to measure the first output terminal 40 and the second output terminal 50, so as to monitor the temperature of the first output terminal 40 and the second output terminal 50 in a timely manner, because a suitable temperature is beneficial to improving the capacity retention rate of the battery. Within an appropriate temperature range, the battery can store and release electrical energy more effectively, reducing the capacity loss caused by temperature fluctuations.

[0037] Furthermore, high temperature will accelerate the aging of the internal materials of the battery, while low temperature may reduce the chemical reaction rate inside the battery. Both will affect the cycle life of the battery. By monitoring the temperature of the first output terminal 40 and the second output terminal 50, the battery operating environment can be adjusted in a timely manner, extending the service life of the battery.

[0038] Specifically, high temperature is likely to cause thermal runaway of the battery, which in turn may trigger a safety accident. Real-time monitoring of the temperature of the first output terminal 40 and the second output terminal 50 can promptly detect abnormal temperatures and take corresponding measures for intervention to avoid the occurrence of thermal runaway. Under low-temperature conditions, the internal resistance of the battery will increase, resulting in increased power consumption. Through temperature detection, the battery operating environment can be optimized, the internal resistance can be reduced, and the charge and discharge efficiency of the battery can be improved.

[0039] The temperature detection of the first output terminal 40 and the second output terminal 50 provides key data support for the battery management system, enabling the system to more precisely control the charge and discharge process of the battery and improve the use efficiency of the battery. At the same time, potential battery failure hazards, such as abnormal temperature rises, can be detected in a timely manner, providing early warning information for maintenance and replacement, and reducing losses caused by failures.

[0040] In one embodiment, the distance between two adjacent first temperature sensors 20 in the first direction is L1, where 90 mm ≤ L1 ≤ 110 mm. When L1 > 110 mm, the distance between two adjacent first temperature sensors 20 in the first direction is too large. Due to the limited length of the battery module 1, not only the number of first temperature sensors 20 is reduced, but also it is not conducive to accurately monitoring the temperature of the battery cells 11. When L1 < 90 mm, the distance between two adjacent first temperature sensors 20 in the first direction is too small, which will increase the number of first temperature sensors 20 and is not conducive to controlling the production cost of the battery module 1. Therefore, setting 90 mm ≤ L1 ≤ 110 mm can not only ensure the number of first temperature sensors 20, facilitate accurate monitoring of the temperature of the battery cells 11, but also prevent the number of first temperature sensors 20 from being excessive, which is beneficial to controlling the production cost of the battery module 1 and realizing the mass production of the battery module 1. Optionally, L1 can be set to values such as 90 mm, 100 mm, or 110 mm. In this application, L1 is set to 110 mm.

[0041] In one embodiment, the distance between two adjacent first temperature sensors 20 in the second direction is L2, where 90 mm ≤ L2 ≤ 110 mm. When L2 > 110 mm, the distance between two adjacent first temperature sensors 20 in the second direction is too large. Due to the limited length of the battery module 1, not only the number of first temperature sensors 20 is reduced, but also it is not conducive to accurately monitoring the temperature of the battery cells 11. When L2 < 90 mm, the distance between two adjacent first temperature sensors 20 in the second direction is too small, which will increase the number of first temperature sensors 20 and is not conducive to controlling the production cost of the battery module 1. Therefore, setting 90 mm ≤ L2 ≤ 110 mm can not only ensure the number of first temperature sensors 20, facilitate accurate monitoring of the temperature of the battery cells 11, but also prevent the number of first temperature sensors 20 from being excessive, which is beneficial to controlling the production cost of the battery module 1 and realizing the mass production of the battery module 1. Optionally, L2 can be set to values such as 90 mm, 100 mm, or 110 mm. In this application, L2 is set to 110 mm.

[0042] In this application, L1 can be set to be greater than, equal to, or less than L2. The specific setting should be selected according to the usage environment of the battery module 1.

[0043] In one embodiment, there is at least one battery cell 11 between two adjacent first temperature sensors 20 arranged in the second direction. In the first embodiment of the present application, the battery module 1 includes 4 battery cell groups 10, and each battery cell group 10 includes 13 battery cells 11. In the first battery cell group 10 from top to bottom, the first temperature sensors 20 are arranged on the battery cells 11 at positions 1, 3, 5, 7, 9, 11, and 13 from left to right; in the second battery cell group 10 from top to bottom, the first temperature sensors 20 are arranged on the battery cells 11 at positions 2, 4, 6, 8, 10, 12, and 13 from left to right; in the third battery cell group 10 from top to bottom, the first temperature sensors 20 are arranged on the battery cells 11 at positions 1, 3, 5, 7, 9, 11, and 13 from left to right; in the fourth battery cell group 10 from top to bottom, the first temperature sensors 20 are arranged on the battery cells 11 at positions 1, 2, 4, 6, 8, 10, and 13 from left to right. Such uniform distribution can improve the accurate monitoring of the temperature of the battery module 1.

[0044] In the second embodiment of the present application, the battery module 1 includes 4 battery cell groups 10, and each battery cell group 10 includes 13 battery cells 11. In the first battery cell group 10 from top to bottom, the first temperature sensors 20 are arranged on the battery cells 11 at positions 2, 7, and 13 from left to right; in the second battery cell group 10 from top to bottom, the first temperature sensors 20 are arranged on the battery cells 11 at positions 2, 6, and 12 from left to right; in the third battery cell group 10 from top to bottom, the first temperature sensors 20 are arranged on the battery cells 11 at positions 1, 7, and 13 from left to right; in the fourth battery cell group 10 from top to bottom, the first temperature sensors 20 are arranged on the battery cells 11 at positions 2, 8, and 12 from left to right. Such uniform distribution can improve the accurate monitoring of the temperature of the battery module 1.

[0045] In the third embodiment of the present application, the battery module 1 includes 4 battery cell groups 10, and each battery cell group 10 includes 13 battery cells 11. In the first battery cell group 10 from top to bottom, the first temperature sensors 20 are arranged on the battery cells 11 at positions 2, 7, and 12 from left to right; in the second battery cell group 10 from top to bottom, the first temperature sensors 20 are arranged on the battery cells 11 at positions 2, 7, and 12 from left to right; in the third battery cell group 10 from top to bottom, the first temperature sensors 20 are arranged on the battery cells 11 at positions 2, 7, and 12 from left to right; in the fourth battery cell group 10 from top to bottom, the first temperature sensors 20 are arranged on the battery cells 11 at positions 2, 7, and 12 from left to right. Such uniform distribution can improve the accurate monitoring of the temperature of the battery module 1.

[0046] In the fourth embodiment of the present application, the battery module 1 includes 4 cell groups 10, and each cell group 10 includes 13 cells 11. In the first cell group 10 from top to bottom, the first temperature sensor 20 is disposed on the cells 11 at positions 2, 7, and 12 from left to right; in the second cell group 10 from top to bottom, the first temperature sensor 20 is disposed on the cells 11 at positions 2, 7, and 12 from left to right; in the third cell group 10 from top to bottom, the first temperature sensor 20 is disposed on the cells 11 at positions 2, 7, and 12 from left to right; in the fourth cell group 10 from top to bottom, the first temperature sensor 20 is disposed on the cells 11 at positions 2, 7, and 12 from left to right. Such uniform distribution can improve the accurate monitoring of the temperature of the battery module 1.

[0047] Moreover, in the third and fourth embodiments, the positions where the first temperature sensors 20 are disposed on the same cell are different, so that the battery module 1 can be monitored according to the requirements under different usage environments, thereby improving the monitoring application range of the first temperature sensors 20.

[0048] In one embodiment, two adjacent first temperature sensors 20 arranged along the first direction are respectively connected to pole posts of different polarities. By such an arrangement, the monitoring range and applicability of the first temperature sensors 20 can be improved, so as to meet the usage requirements under different environments.

[0049] In one embodiment, the battery module 1 further includes a connecting piece 60. The connecting piece 60 is disposed on the cell 11, and the pole posts of two adjacent cells 11 are electrically connected through the connecting piece 60. The first temperature sensor 20 is connected to the connecting piece 60. By such an arrangement, the first temperature sensor 20 does not occupy additional installation space, thereby being able to reduce the overall volume of the battery module 1 to achieve the miniaturized development of the battery module 1.

[0050] In one embodiment, the first temperature sensor 20 is fixedly welded or adhered to the connecting piece 60. In the present application, the first temperature sensor 20 is fixedly welded to the connecting piece 60. Since welding fixation has greater rigidity and overall performance, it can withstand various loads to improve the connection stability between the first temperature sensor 20 and the connecting piece 60.

[0051] In one embodiment, the first temperature sensor 20 and the second temperature sensor 30 include a thermistor sensor or a temperature-sensitive chip. In the present application, both the first temperature sensor 20 and the second temperature sensor 30 are set as negative temperature coefficient thermistors.

[0052] Optionally, in other embodiments of the present application, the first temperature sensor 20 and the second temperature sensor 30 can also be set as other types, such as thermocouple temperature sensing, as long as the temperature monitoring requirements of the device can be met.

[0053] In one embodiment, the angle between the first direction and the second direction is a right angle. Such a setting makes the arrangement of the battery cell groups 10 more reasonable, so as to improve the efficiency when installing the battery cell groups 10.

[0054] In a second aspect, an embodiment of the present utility model provides a battery pack, which includes: a battery box body 70 having an accommodation cavity; the above-mentioned battery module 1, and the battery module 1 is arranged in the accommodation cavity.

[0055] Applying the technical solution of the present utility model, a first temperature sensor 20 is arranged on the battery cell 11, and the number of the first temperature sensors 20 is set to be less than the number of the battery cells 11. In this way, not only can the temperature of the battery cells 11 be monitored to reduce the risk of overheating and out-of-control of the battery cells 11, but also the production cost of the battery module 1 can be reduced to a certain extent, so as to facilitate the mass production of the battery module 1 and achieve the purpose of cost reduction and efficiency improvement.

[0056] 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 application. 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, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0057] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps described in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters indicate like items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0058] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0059] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation other than the orientation described in the drawings for the device. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0060] In addition, it should be noted that using words such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without separate statement, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0061] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery module, characterized in that, The battery module includes: A plurality of battery cell groups arranged in sequence along a first direction, each of the battery cell groups including a plurality of battery cells arranged in sequence along a second direction, an included angle existing between the first direction and the second direction; A plurality of first temperature sensors, the first temperature sensors being connected to the battery cells to monitor the temperatures of the battery cells, the number of the first temperature sensors being less than the number of the battery cells.

2. The battery module according to claim 1, wherein The battery module further includes: A second temperature sensor; A first output terminal; A second output terminal having a polarity opposite to that of the first output terminal, the second temperature sensor being connected to the first output terminal and / or the second output terminal to monitor the temperature of the first output terminal and / or the second output terminal.

3. The battery module according to claim 1, wherein The distance between two adjacent ones of the first temperature sensors in the first direction is L1, and 90 mm ≤ L1 ≤ 110 mm.

4. The battery module according to claim 1, wherein, The distance between two adjacent ones of the first temperature sensors in the second direction is L2, and 90 mm ≤ L2 ≤ 110 mm.

5. The battery module according to any one of claims 1-4, characterized in that, There is at least one of the battery cells between two adjacent ones of the first temperature sensors arranged along the second direction.

6. The battery module according to any one of claims 1-4, characterized in that, Two adjacent ones of the first temperature sensors arranged along the first direction are respectively connected to pole columns with different polarities.

7. The battery module according to claim 1, wherein The battery module further includes a connecting piece, the connecting piece being arranged on the battery cells, the pole columns of two adjacent battery cells being electrically connected through the connecting piece, and the first temperature sensors being connected to the connecting piece.

8. The battery module according to claim 7, characterized in that, The first temperature sensors are fixedly connected to the connecting piece by welding or bonding.

9. The battery module according to claim 2, wherein The first temperature sensors and the second temperature sensor include thermistor sensors or temperature sensing chips.

10. The battery module according to claim 1, wherein, The included angle between the first direction and the second direction is a right angle.

11. A battery pack, characterized in that, The battery pack includes: A battery box body having a receiving cavity; The battery module according to any one of claims 1-10, the battery module being arranged in the receiving cavity.

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