Battery module and battery pack

Abstract

The utility model provides a battery module and battery pack, battery module includes first battery cell group, second battery cell group and vapor chamber, wherein first battery cell group and second battery cell group both include a plurality of battery cells that are arranged along first direction, first battery cell group and second battery cell group are respectively arranged along first direction both sides of vapor chamber, the battery cell is square, and the first direction is the length direction of the battery cell. According to the battery module provided by the utility model, the battery cells are transversely arranged, which is different from the traditional mode that the battery cells are stacked and arranged along the thickness direction, so that only two batteries generate expansion interaction in the side direction of the battery cells, the battery module does not generate expansion force accumulation in the use process, and the structure is not damaged; the performance of the battery cell can be ensured; and the temperature equalizing plate is arranged between the first battery cell group and the second battery cell group and is used for equalizing the temperature of the battery module so as to reduce the temperature difference of the battery module and further keep the performance consistency of the battery cells.

Description

Technical Field

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

[0002] In the related art, a square module is designed with multiple groups of battery cells arranged in parallel along its length direction, and each battery cell group is formed by stacking multiple battery cells along its thickness direction. Such a module generates a large cumulative expansion force during use, which will eventually cause structural damage and degradation of battery cell performance. In addition, such a module has a higher temperature between two adjacent groups of battery cells, resulting in a large temperature difference in the module, which in turn leads to poor consistency in battery cell performance. Utility Model Content

[0003] The purpose of the embodiment of the utility model is to provide a battery module to solve the technical problems existing in the prior art that the cumulative amount of expansion force generated by the battery module during use is large and the middle temperature of the module is high.

[0004] In a first aspect, an embodiment of the utility model provides a battery module, comprising:

[0005] A first battery cell group, comprising a plurality of battery cells arranged along a first direction;

[0006] A second battery cell group, comprising a plurality of battery cells arranged along a first direction; and

[0007] A temperature averaging plate, wherein the first battery cell group and the second battery cell group are respectively arranged on two sides of the temperature averaging plate along a first direction;

[0008] The shape of the battery cell is square, and the first direction is the length direction of the battery cell.

[0009] In one embodiment, the battery module further includes:

[0010] a third battery cell group, comprising a plurality of battery cells arranged along the first direction, wherein the third battery cell group is disposed on one side of the temperature vapor chamber along the first direction; and

[0011] A fourth battery cell group, comprising a plurality of battery cells arranged along the first direction, wherein the fourth battery cell group is disposed on the other side of the temperature homogenizing plate along the first direction;

[0012] Among them, the height direction of the battery cell is the second direction, the third battery cell group is arranged on one side of the first battery cell group along the second direction, and the electrode columns of the battery cells of the first battery cell group and the electrode columns of the battery cells of the third battery cell group are deviated from each other, and the fourth battery cell group is arranged on one side of the second battery cell group along the second direction, and the electrode columns of the battery cells of the second battery cell group and the electrode columns of the battery cells of the fourth battery cell group are deviated from each other.

[0013] In one embodiment, the first battery cell group, the second battery cell group, the third battery cell group and the fourth battery cell group have the same number of battery cells, and the positive electrode column and the negative electrode column of each battery cell of each battery cell group are alternately arranged along the first direction;

[0014] Among them, the arrangement of positive and negative electrode columns of the first battery cell group is the same as that of the fourth battery cell group, and the arrangement of positive and negative electrode columns of the second battery cell group is the same as that of the third battery cell group.

[0015] In one embodiment, the battery module further includes:

[0016] A first electrode connecting sheet, used to connect the positive electrode column and the negative electrode column adjacently arranged along the first direction;

[0017] A second electrode connecting sheet, used for connecting the positive electrode column and the negative electrode column which are adjacently arranged along the second direction and located at one end of the battery cell group; and

[0018] A power output terminal is arranged at one end of the battery cell group away from the second electrode connecting sheet, and the power output terminal is used as an output end of the battery module.

[0019] In one embodiment, the battery module further includes:

[0020] A third electrode connecting sheet;

[0021] The thickness direction of the battery cell is the third direction, and the third electrode connecting sheet is used to connect the positive electrode column and the negative electrode column which are adjacently arranged along the third direction and located at one end of the battery cell group away from the second electrode connecting sheet.

[0022] In one embodiment, the battery module further includes:

[0023] A first side plate, arranged on one side of the battery cell group along the third direction;

[0024] A second side plate is arranged on the other side of the battery cell group along the third direction; and

[0025] The steel belt surrounds the battery cell group along the first direction and the third direction and is arranged outside the first side plate and the second side plate.

[0026] In one embodiment, the first side plate and the second side plate are both provided with guide grooves along the first direction, and the steel belt is arranged in the guide grooves.

[0027] In one embodiment, the temperature homogenizing plate is a hollow structure.

[0028] In one embodiment, the temperature homogenizing plate is provided with mounting holes spaced apart along the first direction and the second direction, and each of the battery cells is bonded to an opening of one of the mounting holes.

[0029] In a second aspect, the utility model provides a battery pack, which includes the battery module as described above.

[0030] The battery module provided by the utility model has the beneficial effects that, compared with the related art, the first battery cell group and the second battery cell group of the battery module of the utility model both include a plurality of battery cells arranged along the length direction of the battery cells, that is, the battery cells are arranged transversely, which is different from the traditional way of stacking and arranging the battery cells along the thickness direction, so that only two batteries generate expansion interaction on the side of the battery cells, and the battery module will not generate accumulation of expansion force during use, and will not cause structural damage, thereby ensuring the performance of the battery cells; and a temperature equalizing plate is arranged between the first battery cell group and the second battery cell group, and the temperature equalizing plate is used to equalize the temperature of the battery module to reduce the temperature difference of the battery module, thereby maintaining consistent battery cell performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 A schematic diagram of the three-dimensional structure of a battery module provided by an embodiment of the utility model;

[0033] Figure 2 A schematic diagram of the three-dimensional structure of a temperature equalizing plate provided in an embodiment of the utility model;

[0034] Figure 3 A schematic diagram of the three-dimensional structure of the second side plate provided in an embodiment of the utility model;

[0035] Figure 4 A schematic diagram of the distribution of positive and negative electrodes of a battery module provided in an embodiment of the utility model;

[0036] Figure 5 A schematic diagram of the three-dimensional structure of a battery pack provided in an embodiment of the utility model;

[0037] Figure 6 Schematic diagram of the structure of the battery pack bonded to the temperature equalizing plate provided in the embodiment of the utility model Figure 1 ;

[0038] Figure 7Schematic diagram of the structure of the battery pack bonded to the temperature equalizing plate provided in the embodiment of the utility model Figure 2 ;

[0039] Figure 8 A schematic diagram of the structure of a battery module provided by an embodiment of the utility model when no electrode sheet is connected;

[0040] Fig. 9 A schematic diagram of the three-dimensional structure of multiple battery modules provided in an embodiment of the utility model.

[0041] Among them, the reference numerals in the figure are:

[0042] 100, battery module; 10, first battery cell group; 11, battery cell; 20, second battery cell group; 30, temperature equalizing plate; 301, mounting hole; 40, third battery cell group; 50, fourth battery cell group; 60, first electrode connecting piece; 70, second electrode connecting piece; 80, power output terminal; 90, third electrode connecting piece; 110, first side plate; 120, second side plate; 121, guide groove; 130, steel belt; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0045] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] It should be pointed out that the square battery cell has six planes, among which the plane with the pole is the top plane, and correspondingly, the plane opposite to the top plane is the bottom plane, and the other four planes are side planes, and the four side planes are arranged opposite to each other in pairs, the two large side planes are arranged opposite to each other and the distance between them is the thickness of the square battery cell, the two small side planes are arranged opposite to each other and the distance between them is the length of the square battery cell, the large side plane is the side plane with a relatively large surface area, and conversely, the small side plane is the side plane with a relatively small surface area.

[0048] See also Figure 1 , the battery module 100 provided by the embodiment of the utility model is now described. The battery module 100 includes a first battery cell group 10, a second battery cell group 20 and a temperature averaging plate 30. Among them, the first battery cell group 10 includes a plurality of battery cells 11 arranged along the first direction X, and the second battery cell group 20 also includes a plurality of battery cells 11 arranged along the first direction X. The first battery cell group 10 is arranged on one side of the temperature averaging plate 30 along the first direction X, and the second battery cell group 20 is arranged on the other side of the temperature averaging plate 30 along the first direction X. Among them, the shape of the battery cell 11 is square, that is, the battery cell 11 is a rectangular parallelepiped as a whole, and the first direction X is the length direction of the battery cell 11.

[0049] It is understandable that when the first battery cell group 10, the second battery cell group 20 and the temperature equalizing plate 30 are combined to form the battery module 100, the first battery cell group 10 and the second battery cell group 20 include the same number of battery cells 11, and the specific number of each battery cell group can be selected according to actual needs.

[0050] Compared with the related art, the battery module 100 provided in the embodiment of the utility model has a first cell group 10 and a second cell group 20 of the battery module 100, each including a plurality of cells 11 arranged along the length direction of the cell 11, that is, the cell 11 is arranged transversely, which is different from the traditional stacking arrangement of the cell 11 along the thickness direction, so that only two batteries have expansion interaction on the side of the cell 11, and the battery module 100 will not generate expansion force accumulation during use, and will not cause structural damage, thereby ensuring the cell performance; and a temperature equalizing plate 30 is arranged between the first cell group 10 and the second cell group 20, and the temperature equalizing plate 30 is used to equalize the temperature of the battery module 100 to reduce the temperature difference of the battery module 100, thereby maintaining consistent cell performance.

[0051] Specifically, the battery cell 11 includes a positive electrode sheet, a separator and a negative electrode sheet stacked in sequence along the thickness direction of the battery cell 11. When the battery is charged and discharged, the positive electrode sheet and the negative electrode sheet will generate a force perpendicular to the electrode sheet, thereby generating an expansion force along the thickness direction on the battery cell 11; traditional battery cells 11 are stacked along the thickness direction, which will generate a cumulative expansion force of multiple battery cells 11 in the thickness direction of the battery cell 11, while the battery module of this embodiment has only two battery cells 11 in the thickness direction of the battery cell 11, so only two battery cells 11 produce expansion interaction.

[0052] In one embodiment of the present invention, please refer to Figure 1 The battery module 100 may further include a third battery cell group 40 and a fourth battery cell group 50, wherein the third battery cell group 40 includes a plurality of battery cells 11 arranged along the first direction X, and the fourth battery cell group 50 also includes a plurality of battery cells 11 arranged along the first direction X, and the third battery cell group 40 is arranged on one side of the temperature averaging plate 30 along the first direction X, and the fourth battery cell group 50 is arranged on the other side of the temperature averaging plate 30 along the first direction X.

[0053] In this embodiment, the height direction of the battery cell 11 is the second direction Y, which intersects the first direction X. The third battery cell group 40 is arranged on one side of the first battery cell group 10 along the second direction Y, and the fourth battery cell group 50 is arranged on one side of the second battery cell group 20 along the second direction Y. At this time, the third battery cell group 40 is arranged on one side of the temperature averaging plate 30 along the first direction X, and the fourth battery cell group 50 is arranged on the other side of the temperature averaging plate 30 along the first direction X. In other words, the third battery cell group 40, the fourth battery cell group 50, the second battery cell group 20 and the first battery cell group 10 are arranged in sequence on the end surface of the battery module 100 along the first direction X and in the clockwise direction.

[0054] The electrode columns of the cells 11 of the first cell group 10 and the electrode columns of the cells 11 of the third cell group 40 are separated from each other, and the electrode columns of the cells 11 of the second cell group 20 and the electrode columns of the cells 11 of the fourth cell group 50 are separated from each other. In this way, the electrode columns of each cell 11 of the cell group are arranged outward to facilitate welding of the electrode connecting sheet.

[0055] It can be understood that when the first battery cell group 10, the second battery cell group 20, the third battery cell group 40, the fourth battery cell group 50 and the temperature equalizing plate 30 are combined to form the battery module 100, the number of battery cells 11 included in the first battery cell group 10, the second battery cell group 20, the third battery cell group 40 and the fourth battery cell group 50 is the same, and the specific number of each battery cell group can be selected according to actual needs.

[0056] In one embodiment of the present invention, please refer to Figure 1 and Figure 4, the number of cells 11 in the first cell group 10, the second cell group 20, the third cell group 40 and the fourth cell group 50 is the same. A positive electrode column and a negative electrode column are arranged on the end surface of one end of the cell 11 along the second direction Y, and the positive electrode column and the negative electrode column of each cell 11 of each cell group are alternately arranged along the first direction X. Among them, the arrangement of the positive and negative electrode columns of the first cell group 10 is the same as that of the fourth cell group 50; the arrangement of the positive and negative electrode columns of the second cell group 20 is the same as that of the third cell group 40. Please refer to Figure 4 , "+" represents the positive column, and "-" represents the negative column.

[0057] In this embodiment, the cell groups of the battery module 100 are arranged vertically and horizontally in a centrally symmetrical manner, and the positive and negative electrode columns of each cell group are arranged alternately, so that the battery module 100 can ensure the alternation of positive and negative poles when in use, and does not require fool-proof design. Its assembly is simple, with fewer structural parts and lower cost.

[0058] See also Fig. 9 When a plurality of battery modules 100 are placed in a battery pack, any arrangement of the battery modules 100 along the width direction can ensure alternation of positive and negative poles, so there is no need to prevent fooling around.

[0059] In one embodiment of the present invention, please refer to Figure 1 , the battery module 100 may also include a first electrode connecting sheet 60, a second electrode connecting sheet 70 and a power output terminal 80. Among them, the first electrode connecting sheet 60 is used to connect the positive electrode column and the negative electrode column arranged adjacently along the first direction X; the second electrode connecting sheet 70 is used to connect the positive electrode column and the negative electrode column arranged adjacently along the second direction Y and located at one end of the battery cell group; the power output terminal 80 is arranged at one end of the battery cell group away from the second electrode connecting sheet 70, and the power output terminal 80 is used as the output end of the battery module 100. In this embodiment, there are two power output terminals 80, one is the positive electrode and the other is the negative electrode. The power output of the battery module 100 is on the same side, which is convenient for power connection and can also save wiring arrangement.

[0060] In one embodiment of the present invention, please refer to Figure 1 , the battery module 100 may further include a third electrode connecting sheet 90. In this embodiment, the thickness direction of the battery cell 11 is the third direction Z, and the third electrode connecting sheet 90 is used to connect the positive electrode column and the negative electrode column that are adjacently arranged along the third direction Z and located at one end of the battery cell group away from the second electrode connecting sheet 70. At this time, the battery cells 11 of each battery cell group of the battery module 100 are connected in series into a whole, and its structure is simple and compact.

[0061] In one embodiment of the present invention, please refer to Figure 1, the battery module 100 may further include a first side plate 110, a second side plate 120 and a steel belt 130. Among them, the first side plate 110 is arranged on one side of the battery cell group along the third direction Z, and the second side plate 120 is arranged on the other side of the battery cell group along the third direction Z. Specifically, the first side plate 110 is arranged on one side of the second battery cell group 20 and the fourth battery cell group 50 along the third direction Z, and the second side plate 120 is arranged on one side of the first battery cell group 10 and the third battery cell group 40 along the third direction Z. The steel belt 130 is arranged outside the first side plate 110 and the second side plate 120 along the first direction X and the second direction Y around the battery cell group. In this embodiment, the first side plate 110 and the second side plate 120 are used to protect the battery cell group, and the steel belt 130 is used to bundle the battery cell group to fix the battery module 100 into a whole.

[0062] In one embodiment of the present invention, please refer to Figure 1 and Figure 2 The temperature equalizing plate 30 is a hollow structure, and the temperature equalizing plate 30 can also be filled with phase change materials, such as copper VC (Vapor Chamber, temperature equalizing plate), which can simultaneously achieve the two functions of absorbing expansion force and equalizing temperature.

[0063] In one embodiment, see Figure 2 The temperature averaging plate 30 is provided with mounting holes 301 spaced apart along the first direction X and the second direction Y, and each battery cell 11 is bonded to the opening of one of the mounting holes 301. In this embodiment, the mounting hole 301 penetrates the temperature averaging plate 30 along the third direction Z, thereby forming two openings arranged opposite to each other in the third direction Z, and a battery cell 11 is bonded to each opening. The shape of the mounting hole 301 is adapted to the shape of the battery cell 11, and a plurality of mounting holes 301 are arranged in an array on the temperature averaging plate 30.

[0064] It is understandable that in other embodiments, the mounting holes 301 may also be arranged in other ways and have other shapes.

[0065] In one embodiment of the present invention, please refer to Figure 1 and Figure 3 , the first side plate 110 and the second side plate 120 are both provided with guide grooves 121 along the first direction X, and the steel belt 130 is arranged in the guide grooves 121. In this embodiment, the guide grooves 121 are used to guide the steel belt 130, and at the same time, the steel belt 130 is confined in the groove to prevent the steel belt 130 from moving, thereby ensuring that the steel belt 130 firmly bundles the battery module 100 into a whole. Among them, the shape of the guide grooves 121 is adapted to the shape of the steel belt 130, the guide grooves 121 penetrate the end surfaces of the first side plate 110 and the second side plate 120, and the guide grooves 121 are provided on the side surfaces of the first side plate 110 and the second side plate 120 facing away from the battery cell group.

[0066] Please also read Figures 4 to 8 The assembly method of the battery module 100 of the embodiment of the utility model is as follows:

[0067] See also Figure 5 , firstly arrange the battery cells 11 horizontally;

[0068] See also Figure 6 and Figure 7 , bonding the battery cell 11 and the temperature absorbing plate 30 with a thermally conductive structural adhesive;

[0069] See also Figure 8 , respectively install the first side plate 110, the second side plate 120 and the steel belt 130, wherein the positive and negative electrodes of the upper and lower layers of the battery cells 11 are arranged alternately;

[0070] See also Figure 4 , weld the electrode connecting piece, and reserve the module power output terminal 80 to assemble into a finished battery module 100.

[0071] An embodiment of the utility model further provides a battery pack, which includes the battery module 100 described above.

[0072] 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 and improvements 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 module, characterized in that: include: A first battery cell group, comprising a plurality of battery cells arranged along a first direction; A second battery cell group, comprising a plurality of battery cells arranged along a first direction; as well as A temperature averaging plate, wherein the first battery cell group and the second battery cell group are respectively arranged on two sides of the temperature averaging plate along a first direction; The shape of the battery cell is square, and the first direction is the length direction of the battery cell.

2. The battery module according to claim 1, characterized in that: The battery module also includes: a third battery cell group, comprising a plurality of battery cells arranged along the first direction, wherein the third battery cell group is disposed on one side of the temperature vapor chamber along the first direction; and A fourth battery cell group, comprising a plurality of battery cells arranged along the first direction, wherein the fourth battery cell group is disposed on the other side of the temperature homogenizing plate along the first direction; Among them, the height direction of the battery cell is the second direction, the third battery cell group is arranged on one side of the first battery cell group along the second direction, and the electrode columns of the battery cells of the first battery cell group and the electrode columns of the battery cells of the third battery cell group are deviated from each other, and the fourth battery cell group is arranged on one side of the second battery cell group along the second direction, and the electrode columns of the battery cells of the second battery cell group and the electrode columns of the battery cells of the fourth battery cell group are deviated from each other.

3. The battery module according to claim 2, characterized in that: The first battery cell group, the second battery cell group, the third battery cell group and the fourth battery cell group have the same number of battery cells, and the positive electrode column and the negative electrode column of each battery cell of each battery cell group are alternately arranged along the first direction; Among them, the arrangement of positive and negative electrode columns of the first battery cell group is the same as that of the fourth battery cell group, and the arrangement of positive and negative electrode columns of the second battery cell group is the same as that of the third battery cell group.

4. The battery module according to claim 3, characterized in that: The battery module also includes: A first electrode connecting sheet, used to connect the positive electrode column and the negative electrode column adjacently arranged along the first direction; A second electrode connecting sheet, used for connecting the positive electrode column and the negative electrode column which are adjacently arranged along the second direction and located at one end of the battery cell group; and A power output terminal is arranged at one end of the battery cell group away from the second electrode connecting sheet, and the power output terminal is used as an output end of the battery module.

5. The battery module according to claim 4, characterized in that: The battery module also includes: A third electrode connecting sheet; The thickness direction of the battery cell is the third direction, and the third electrode connecting sheet is used to connect the positive electrode column and the negative electrode column which are adjacently arranged along the third direction and located at one end of the battery cell group away from the second electrode connecting sheet.

6. The battery module according to claim 5, characterized in that: The battery module also includes: A first side plate, arranged on one side of the battery cell group along the third direction; A second side plate is arranged on the other side of the battery cell group along the third direction; and The steel belt surrounds the battery cell group along the first direction and the third direction and is arranged outside the first side plate and the second side plate.

7. The battery module according to claim 6, characterized in that: The first side plate and the second side plate are both provided with guide grooves along the first direction, and the steel belt is arranged in the guide grooves.

8. The battery module according to any one of claims 2 to 7, characterized in that: The temperature equalizing plate is a hollow structure.

9. The battery module according to claim 8, characterized in that: The temperature homogenizing plate is provided with mounting holes spaced apart along the first direction and the second direction, and each of the battery cells is bonded to an opening of one of the mounting holes.

10. A battery pack, characterized in that: Comprising the battery module according to any one of claims 1 to 9.

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