Battery cell, battery module and battery pack

Abstract

The utility model discloses a battery cell, a battery module and a battery pack. The battery cell comprises a shell, a first cover plate and a second cover plate, two ends of the shell in the length direction are opened; the first cover plate and the second cover plate are respectively arranged at the openings at the two ends of the shell, a positive pole and a negative pole are arranged on the first cover plate, and an anti-explosion valve is arranged on the second cover plate. According to the battery cell disclosed by the utility model, the two ends of the shell are opened, and the first cover plate provided with the positive pole and the negative pole and the second cover plate provided with the anti-explosion valve are respectively arranged at the openings in the two ends of the shell; according to the invention, the positive pole and the negative pole which are used for electric connection on the battery cell can be separated from the explosion-proof valve which has a safety function and sprays hot gas outwards when the battery cell is in thermal runaway, so that the influence on the electric connection of the positive pole and the negative pole when the battery cell is in thermal runaway and the explosion-proof valve is on fire can be avoided, the thermoelectric separation of the battery cell is realized, and more serious safety accidents are avoided.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of batteries, and in particular to a battery core, a battery module and a battery pack. Background Art

[0002] With the continuous development of technology, users have higher and higher requirements for new energy batteries. In order to improve the safety performance of battery cells, explosion-proof valves are usually installed on battery cells. When the battery thermal runaway occurs, the explosion-proof valve opens, and when the explosion-proof valve catches fire, it is easy to affect the circuit connection and cause more serious safety accidents. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery cell, which can avoid thermal runaway of the battery cell and fire at the explosion-proof valve affecting the electrical connection at the positive pole and the negative pole, thereby achieving thermal and electrical separation of the battery cell.

[0004] The utility model also provides a battery module, which includes the above-mentioned battery core.

[0005] The utility model also provides a battery pack, which includes the above-mentioned battery module.

[0006] The battery cell according to the embodiment of the utility model comprises a shell, a first cover plate and a second cover plate. The two ends of the shell in the length direction are open; the first cover plate and the second cover plate are respectively arranged at the open openings at the two ends of the shell, the first cover plate is provided with a positive pole column and a negative pole column, and the second cover plate is provided with an explosion-proof valve.

[0007] According to the battery cell of the embodiment of the utility model, by opening the two ends of the shell, and respectively arranging the first cover plate provided with the positive electrode column and the negative electrode column and the second cover plate provided with the explosion-proof valve at the open openings at the two ends of the shell, the positive electrode column and the negative electrode column used for electrical connection on the battery cell and the explosion-proof valve having a safety function and spraying hot gas outward when the battery cell thermally runs away can be separated, which can prevent the battery cell from thermally running away or fire at the explosion-proof valve from affecting the electrical connection at the positive electrode column and the negative electrode column, thereby realizing thermal and electrical separation of the battery cell and avoiding more serious safety accidents.

[0008] In some embodiments of the present invention, the positive electrode column and the negative electrode column are arranged in the width direction of the battery cell and the positive electrode column and the negative electrode column are symmetrically arranged with respect to a center plane of the battery cell that is perpendicular to the width direction.

[0009] In some embodiments of the present invention, a liquid injection hole is provided on the second cover plate, and the liquid injection hole and the explosion-proof valve are spaced apart in the width direction of the battery core.

[0010] The battery module according to the embodiment of the present invention comprises the above-mentioned battery cell, wherein the number of the battery cells is multiple.

[0011] According to the battery module of the embodiment of the utility model, by opening the two ends of the shell, and respectively arranging the first cover plate provided with the positive electrode column and the negative electrode column and the second cover plate provided with the explosion-proof valve at the open openings at the two ends of the shell, the positive electrode column and the negative electrode column used for electrical connection on the battery cell and the explosion-proof valve with a safety function for spraying hot gas outward when the battery cell thermally runs away can be separated, which can prevent the battery cell from thermally running away or fire at the explosion-proof valve from affecting the electrical connection at the positive electrode column and the negative electrode column, realize the thermal and electrical separation of the battery cell, avoid causing more serious safety accidents, and make the battery module safer and more reliable.

[0012] In some embodiments of the present invention, the plurality of battery cells are divided into a first battery group and a second battery group which are spaced apart in the length direction of the battery cells, the first battery group and the second battery group each include a plurality of the battery cells, the explosion-proof valves of the battery cells in the first battery group are located on a side of the battery cells away from the second battery group, and the explosion-proof valves of the battery cells in the second battery group are located on a side of the battery cells away from the first battery group.

[0013] In some embodiments of the present invention, the first battery group and the second battery group include a plurality of columns of battery cells arranged along a width direction of the battery cells, and each column of the battery cells includes a plurality of battery cells arranged in a thickness direction of the battery cells.

[0014] In some embodiments of the present invention, the first battery group and the second battery group have the same number of columns and the same number of battery cells in each column.

[0015] In some embodiments of the present invention, the battery cells of the first battery group are connected to the battery cells of the same layer in the thickness direction of the battery cells in the second battery group, and along the width direction of the battery cells, the multiple columns of the battery cells of the first battery group are L1 to L2, respectively. n The multiple columns of cells in the second battery pack are M1 to M n Column, No. L i The positive electrode column of the battery cell in the battery cell array is connected to the Mth i The negative poles of the cells in the Lth column are connected by a connecting piece. i The negative electrode column of the battery cell in the battery cell array is connected to the Mth i-1 The positive poles of the battery cells in the battery cell column are connected by connecting sheets, wherein 1≤i≤n.

[0016] In some embodiments of the present invention, along the width direction of the battery cell, the positive electrode column of the battery cell is located on the same side of the negative electrode column, the first battery group and the second battery group are staggered in the width direction of the battery cell, and the first battery group is staggered in the width direction of the battery cell. i The positive electrode column of the battery cell in the battery cell array is connected to the Mth i The negative electrode columns of the cells in the row of cells are arranged opposite to each other in the length direction of the cells, and the Lth i The negative electrode column of the battery cell in the battery cell array is connected to the Mth i-1 The positive electrode columns of the battery cells in the battery cell column are arranged opposite to each other in the length direction of the battery cells.

[0017] A battery pack according to an embodiment of the present invention includes the above-mentioned battery module.

[0018] According to the battery pack of the embodiment of the utility model, by opening the two ends of the shell, and providing a first cover plate with a positive electrode column and a negative electrode column and a second cover plate with an explosion-proof valve at the open openings at the two ends of the shell respectively, the positive electrode column and the negative electrode column used for electrical connection on the battery cell and the explosion-proof valve with a safety function for spraying hot gas outward when the battery cell thermally runs away can be separated, which can prevent the battery cell from thermally running away or fire at the explosion-proof valve from affecting the electrical connection at the positive electrode column and the negative electrode column, realize thermal and electrical separation of the battery cell, avoid causing more serious safety accidents, make the battery module safer and more reliable, and make the battery pack safer and more reliable.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a front view of a battery cell according to an embodiment of the utility model;

[0022] Figure 2 It is a left side view of a battery cell according to an embodiment of the utility model;

[0023] Figure 3 It is a right side view of a battery cell according to an embodiment of the utility model;

[0024] Figure 4 is a three-dimensional diagram of a battery cell according to an embodiment of the utility model;

[0025] Figure 5 is a three-dimensional diagram of two stacked battery cells according to an embodiment of the utility model;

[0026] Figure 6 is a front view of a connection between a portion of a first battery pack and a portion of a second battery pack according to an embodiment of the utility model;

[0027] Figure 7 is a three-dimensional diagram of a first battery pack according to an embodiment of the utility model;

[0028] Figure 8 is a front view of a battery module according to an embodiment of the utility model;

[0029] Fig. 9 is a three-dimensional diagram of a conventional arrangement of a first battery pack according to an embodiment of the utility model;

[0030] Fig.10 It is a top view of a conventional arrangement of battery modules according to an embodiment of the present utility model.

[0031] Reference numerals:

[0032] 100. Battery module;

[0033] 10. A first battery pack;

[0034] 1. Battery cell;

[0035] 11. Shell; 12. First cover plate; 121. Positive pole; 122. Negative pole; 13. Second cover plate; 131. Explosion-proof valve; 132. Liquid injection hole;

[0036] 2. Aerogel;

[0037] 20. Second battery pack; 30. Electrical connection channel; 40. Pressure relief channel; 50. Wiring harness area; 60. Connecting piece. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Reference below Figure 1-Figure 4 A battery cell 1 according to an embodiment of the present utility model is described.

[0042] like Figure 1 As shown, the battery cell 1 according to the embodiment of the utility model includes a housing 11 , a first cover plate 12 and a second cover plate 13 .

[0043] Specifically, the length direction of the housing 11 (eg Figure 4 Both ends of the battery cell 1 (in the direction a shown in the figure) are open, and other structures inside the battery cell 1 can be installed inside the shell 11 through the open openings.

[0044] like Figure 2 and Figure 3 As shown, the first cover plate 12 and the second cover plate 13 are respectively arranged at the open openings at both ends of the housing 11, and the first cover plate 12 is provided with a positive electrode column 121 and a negative electrode column 122, and the second cover plate 13 is provided with an explosion-proof valve 131. The positive electrode column 121 and the negative electrode column 122 for electrical connection on the battery cell 1 and the explosion-proof valve 131 with a safety function that can spray out hot gas when the battery cell 1 is thermally runaway can be separated, so that the thermal runaway of the battery cell 1 and the fire at the explosion-proof valve 131 can be avoided to affect the electrical connection at the positive electrode column 121 and the negative electrode column 122, thereby avoiding causing more serious safety accidents.

[0045] According to the battery cell 1 of the embodiment of the utility model, by opening the two ends of the shell 11, and providing the first cover plate 12 with the positive electrode column 121 and the negative electrode column 122 and the second cover plate 13 with the explosion-proof valve 131 at the open openings at the two ends of the shell 11 respectively, the positive electrode column 121 and the negative electrode column 122 for electrical connection on the battery cell 1 and the explosion-proof valve 131 with a safety function for spraying hot gas outward when the battery cell 1 thermally runs away can be separated, so that the electrical connection at the positive electrode column 121 and the negative electrode column 122 can be prevented from being affected by the thermal runaway of the battery cell 1 and the fire at the explosion-proof valve 131, so as to achieve thermal and electrical separation of the battery cell 1 and avoid causing more serious safety accidents.

[0046] In some embodiments of the present invention, Figure 2 and Figure 4 As shown, the positive electrode column 121 and the negative electrode column 122 are in the width direction of the battery cell 1 (such as Figure 4 The positive electrode column 121 and the negative electrode column 122 are arranged in the direction b) and are symmetrically arranged about the center plane of the battery cell 1 that is perpendicular to the width direction. It can be understood that the positive electrode column 121 and the negative electrode column 122 are symmetrical about the center line of the width direction of the battery cell 1 and the center line of the negative electrode column is located at the center position of the negative electrode column 122 side, the center line of the positive electrode column is located at the center position of the positive electrode column 121 side, the positive electrode column 121 is axially symmetrical about the center line of the positive electrode column, and the negative electrode column 122 is axially symmetrical about the center line of the negative electrode column. When the battery cell 1 is arranged horizontally, the positions of the positive electrode column 121 of a single battery cell 1 and the negative electrode column 122 of the opposite battery cell 1 can be electrically connected, and the positions of the negative electrode column 122 of a single battery cell 1 and the positive electrode column 121 of another battery cell 1 can be electrically connected. When multiple battery cells 1 are connected, the misalignment between the positive electrode column 121 and / or the negative electrode column 122 can be avoided.

[0047] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, the second cover plate 13 is provided with a liquid injection hole 132, which can prevent the electrolyte from flowing to the positive electrode column 121 and the negative electrode column 122 when the battery cell 1 is injected, and can prevent the positive electrode column 121 and the negative electrode column 122 of the battery cell 1 from short circuiting. The liquid injection hole 132 and the explosion-proof valve 131 are arranged at intervals in the width direction of the battery cell 1, which can prevent the electrolyte from flowing to the explosion-proof valve 131 when the battery cell 1 is injected, and can prevent the explosion-proof valve 131 from being damaged by corrosion of the electrolyte, thereby preventing the sealing of the battery cell 1 from being affected.

[0048] According to the battery module 100 of the embodiment of the present utility model, Figure 7 As shown, it includes the above-mentioned battery cell 1, and the battery cell 1 is multiple.

[0049] According to the battery module 100 of the embodiment of the utility model, by opening the two ends of the shell 11, and providing the first cover plate 12 with the positive electrode column 121 and the negative electrode column 122 and the second cover plate 13 with the explosion-proof valve 131 at the open openings at the two ends of the shell 11 respectively, the positive electrode column 121 and the negative electrode column 122 for electrical connection on the battery cell 1 and the explosion-proof valve 131 with a safety function for spraying hot gas outward when the battery cell 1 thermally runs away can be separated, and the electrical connection at the positive electrode column 121 and the negative electrode column 122 can be avoided when the battery cell 1 thermally runs away or the explosion-proof valve 131 catches fire, thereby realizing the thermal and electrical separation of the battery cell 1, avoiding causing more serious safety accidents, and making the battery module 100 safer and more reliable.

[0050] In some embodiments of the present invention, Figure 6 and Figure 8 As shown, the plurality of battery cells 1 are divided into a first battery group 10 and a second battery group 20 spaced apart in the length direction of the battery cells 1. The first battery group 10 and the second battery group 20 both include a plurality of battery cells 1. The explosion-proof valve 131 of the battery cell 1 in the first battery group 10 is located on the side of the battery cell 1 away from the second battery group 20, and the explosion-proof valve 131 of the battery cell 1 in the second battery group 20 is located on the side of the battery cell 1 away from the first battery group 10. Figure 8 In the d direction shown in the figure, the positive electrode column 121 and the negative electrode column 122 of the multiple battery cells 1 in the battery module 100 are all located in the middle part, and the explosion-proof valves 131 of the multiple battery cells 1 in the battery module 100 are all located in the two end areas, so that the electrical connection channel 30 of the battery module 100 is concentrated in the middle area, and the pressure relief area of ​​the explosion-proof valve 131 of the battery module 100 is concentrated on both sides of the length direction of the battery module 100, which can realize the thermal and electrical separation of the battery module 100 and improve the safety performance of the battery module 100.

[0051] In addition, if Figure 8 As shown, pressure relief channels 40 may be provided on both sides of the length direction of the battery module 100. When thermal runaway occurs in the battery cell 1, the explosion-proof valve 131 may be directionally ejected, and the gas in the explosion-proof valve 131 is ejected from the pressure relief channels 40 on both sides without affecting the electrical connection channel 30, thereby improving the safety of the battery module 100.

[0052] Furthermore, if Figure 6 and Figure 8 As shown, the first battery pack 10 and the second battery pack 20 include a plurality of battery packs 10 and 20 along the width direction of the battery cell 1 (eg Figure 4 The plurality of columns of battery cells 1 are arranged in the direction b as shown, and each column of battery cells 1 includes a plurality of columns of battery cells 1 arranged in the direction of thickness of the battery cells 1 (as shown in FIG. Figure 4 The first battery pack 10 and the second battery pack 20 are arranged as shown in the c direction. Figure 5As shown, aerogel 2 needs to be arranged between the large surfaces of the battery cells 1 to space the battery cells 1 and reduce the risk of heat spread, while the narrow surfaces do not need to be isolated by aerogel 2.

[0053] Assuming that the size of the battery cell 1 is 20 mm thick, 120 mm wide, and 500 mm long, and a battery module 100 is provided with 40 battery cells 1, the optimized battery module 100 requires aerogel 2120*500*4*4*2=1920000mm 2 ; and Fig. 9 and Fig.10 As shown, the traditional arrangement requires 120*500*19*2=2280000mm 2 ; Aerogel 2 usage was reduced by 15.8%;

[0054] That is, assuming that the thickness of the battery cell 1 is a, the width is ma (m is a positive integer greater than 1, and for the convenience of calculation, it is approximately assumed that the width of the battery cell 1 is m times the thickness), the length of the battery cell 1 is b, and a battery module 100 has a total of 2n battery cells 1, that is, there are n battery cells 1 on one side. If the outer dimensions of the battery module 100 are not greatly changed in order to arrange the arrangement, the traditional method is to arrange n battery cells 1 on each side, and the use area of ​​the aerogel 2 can be calculated as: 2*(n-1)*ma*b=2abm(n-1); and the use area of ​​the aerogel 2 in the arrangement of the utility model can be calculated as: 2*ma*b*(m-1)*(n / m)=2abn(m-1); since n>m in the actual battery module 100, 2abm(n-1)>2abn(m-1), then the reduction amount of aerogel 2 in the utility model is

[0055] It can be seen from this that when the battery cells 1 in the first battery group 10 and the second battery group 20 are arranged in multiple columns along the width direction of the battery cells 1 and each column of battery cells 1 includes multiple battery cells 1 arranged in the thickness direction of the battery cells 1, the use of aerogel 2 can be reduced and the manufacturing cost of the battery module 100 can be reduced.

[0056] Furthermore, if Figure 6 and Figure 8 As shown, the first battery group 10 and the second battery group 20 have the same number of columns and the same number of cells 1 in each column. When the first battery group 10 and the second battery group 20 are electrically connected, the number of positive poles 121 of the first battery group 10 corresponds to the number of negative poles 122 of the second battery group 20, and the number of negative poles 122 of the first battery group 10 corresponds to the number of positive poles 121 of the second battery group 20, so that the electrical connection between the first battery group 10 and the second battery group 20 is more reliable.

[0057] Furthermore, if Figure 6 and Figure 8As shown, the battery cells 1 of the first battery group 10 are connected to the battery cells 1 of the same layer in the thickness direction of the battery cells 1 in the second battery group 20. Along the width direction of the battery cells 1, the multiple columns of battery cells 1 of the first battery group 10 are L1 to L2. n The multiple columns of cells 1 of the second battery pack 20 are M1 to M n Column, No. L i The positive electrode column 121 of the battery cell 1 in the battery cell 1 of the row is connected to the Mth i The negative electrode column 122 of the battery cell 1 in the battery cell 1 of the first row is connected by the connecting piece 60. i The negative electrode column 122 of the battery cell 1 in the battery cell 1 of the row is connected to the Mth i-1 The positive electrode posts 121 of the cells 1 in the column of cells 1 are connected via the connecting sheet 60 , where 1≤i≤n.

[0058] like Figure 8 As shown, at this time, the negative electrode column 122 of the battery cell 1 in the L1th column of the first battery group 10 is electrically connected to the external circuit of the battery module 100, the positive electrode column 121 of the battery cell 1 in the L1th column of the battery cell 1 is connected to the negative electrode column 122 of the battery cell 1 in the M1th column of the battery cell 1 through the connecting piece 60, the negative electrode column 122 of the battery cell 1 in the M1th column of the battery cell 1 is connected to the positive electrode column 121 of the battery cell 1 in the M1th column of the battery cell 1, and the positive electrode column 121 of the battery cell 1 in the M1th column of the battery cell 1 is connected to the negative electrode column 122 of the battery cell 1 in the L2th column of the battery cell 1 through the connecting piece 60. The battery cells 1 in the first battery group 10 and the second battery group 20 are electrically connected in this way, and the battery cells 1 in the M1th column of the second battery group 20 are electrically connected to the battery module 100. n The positive electrode column 121 of the battery cell 1 in the battery cell column 1 is electrically connected to the external circuit of the battery module 100, so that the multiple battery cells 1 in the battery module 100 are all electrically connected, which can make the circuit of the battery module 100 more convenient and smooth.

[0059] Furthermore, if Figure 6 and Figure 8 As shown, along the width direction of the battery cell 1, the positive electrode column 121 of the battery cell 1 is located on the same side of the negative electrode column 122, the first battery group 10 and the second battery group 20 are staggered in the width direction of the battery cell 1, and the first battery group 10 and the second battery group 20 are staggered in the width direction of the battery cell 1. i The positive electrode column 121 of the battery cell 1 in the battery cell 1 of the row is connected to the Mth i The negative electrode column 122 of the battery cell 1 in the L column is arranged opposite to the negative electrode column 122 in the length direction of the battery cell 1. i The negative electrode column 122 of the battery cell 1 in the battery cell 1 of the row is connected to the Mth i-1 The positive electrode posts 121 of the cells 1 in the row of cells 1 are arranged opposite to each other in the length direction of the cells 1. i The positive electrode column 121 of the battery cell 1 in the battery cell 1 of the row is connected to the Mth i The negative electrode column 122 of the battery cell 1 in the battery cell 1 of the first row is connected by the connecting piece 60.i The negative electrode column 122 of the battery cell 1 in the battery cell 1 of the row is connected to the Mth i-1 The positive poles 121 of the battery cells 1 in the battery cell column 1 are connected by connecting pieces 60, which can shorten the length of the connecting pieces 60 in the battery module 100, reduce the risk of the connecting pieces 60 breaking or deforming when the battery module 100 vibrates, avoid contact between multiple connecting pieces 60, and avoid short circuit of the battery module 100 as much as possible.

[0060] In addition, if Figure 8 As shown, the area of ​​the second battery pack 20 that is opposite to the negative electrode 122 of the battery cell 1 in the L1th column of the battery cell 1 in the first battery pack 10 may be provided with a wiring harness area 50, and the area of ​​the first battery pack 10 that is opposite to the negative electrode 122 of the battery cell 1 in the Mth column of the second battery pack 20 n A wiring harness area 50 may be provided in the area directly opposite to the positive electrode 121 of the battery cell 1 in the column of battery cells 1, so that the wiring harness of the battery module 100 can be fixed in the wiring harness area 50, so that the position of the wiring harness of the battery module 100 is clearer, and the inspection of the wiring harness during subsequent repair work of the battery module 100 is more convenient.

[0061] The battery pack according to the embodiment of the present invention includes the above-mentioned battery module 100 .

[0062] According to the battery pack of the embodiment of the utility model, by opening the two ends of the shell 11, and providing the first cover plate 12 with the positive electrode column 121 and the negative electrode column 122 and the second cover plate 13 with the explosion-proof valve 131 at the open openings at the two ends of the shell 11 respectively, the positive electrode column 121 and the negative electrode column 122 for electrical connection on the battery cell 1 and the explosion-proof valve 131 with a safety function for spraying hot gas outward when the battery cell 1 thermally runs away can be separated, and the thermal runaway of the battery cell 1 and the fire at the explosion-proof valve 131 can be avoided. The electrical connection at the positive electrode column 121 and the negative electrode column 122 can be avoided, and the thermal and electrical separation of the battery cell 1 can be achieved to avoid causing more serious safety accidents, so that the battery module 100 can be made safer and more reliable, and the battery pack can be made safer and more reliable.

[0063] Other structures and operations of the battery cell 1 according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A shell, wherein both ends of the shell in the length direction are open; A first cover plate and a second cover plate, wherein the first cover plate and the second cover plate are respectively arranged at the open openings at both ends of the shell, a positive pole and a negative pole are arranged on the first cover plate, and an explosion-proof valve is arranged on the second cover plate.

2. The battery cell according to claim 1, characterized in that: The positive electrode column and the negative electrode column are arranged in the width direction of the battery cell and the positive electrode column and the negative electrode column are symmetrically arranged with respect to a center plane of the battery cell that is perpendicular to the width direction.

3. The battery cell according to claim 1, characterized in that: The second cover plate is provided with a liquid injection hole, and the liquid injection hole and the explosion-proof valve are spaced apart in the width direction of the battery core.

4. A battery module, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 3, wherein the battery cell is in plurality.

5. The battery module according to claim 4, characterized in that: The multiple battery cells are divided into a first battery group and a second battery group which are spaced apart in the length direction of the battery cells. The first battery group and the second battery group each include multiple battery cells. The explosion-proof valves of the battery cells in the first battery group are located on a side of the battery cells away from the second battery group, and the explosion-proof valves of the battery cells in the second battery group are located on a side of the battery cells away from the first battery group.

6. The battery module according to claim 5, characterized in that: The first battery group and the second battery group include a plurality of columns of battery cells arranged along a width direction of the battery cells, and each column of battery cells includes a plurality of battery cells arranged in a thickness direction of the battery cells.

7. The battery module according to claim 6, characterized in that: The first battery group and the second battery group have the same number of columns and the same number of battery cells in each column.

8. The battery module according to claim 7, characterized in that: The battery cells of the first battery group are connected to the battery cells of the same layer in the thickness direction of the battery cells in the second battery group. In the width direction of the battery cells, the multiple columns of the battery cells of the first battery group are L1 to L2. n The multiple columns of cells in the second battery pack are M1 to M n Column, No. L i The positive electrode column of the battery cell in the battery cell array is connected to the Mth i The negative poles of the cells in the Lth column are connected by a connecting piece. i The negative electrode column of the battery cell in the battery cell array is connected to the Mth i-1 The positive poles of the battery cells in the battery cell column are connected by connecting sheets, wherein 1≤i≤n.

9. The battery module according to claim 8, characterized in that: Along the width direction of the battery cell, the positive electrode column of the battery cell is located on the same side of the negative electrode column, the first battery group and the second battery group are staggered in the width direction of the battery cell, and the first battery group is staggered in the width direction of the battery cell. i The positive electrode column of the battery cell in the battery cell array is connected to the Mth i The negative electrode columns of the cells in the row of cells are arranged opposite to each other in the length direction of the cells, and the Lth i The negative electrode column of the battery cell in the battery cell array is connected to the Mth i-1 The positive electrode columns of the battery cells in the battery cell column are arranged opposite to each other in the length direction of the battery cells.

10. A battery pack, characterized in that: Comprising a battery module according to any one of claims 4-9.

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