Battery module and power battery

Abstract

The utility model relates to the technical field of power batteries, in particular to a battery module and a power battery. The battery module has a length direction and a height direction which are perpendicular to each other; the battery module comprises a plurality of first battery cells and a plurality of second battery cells which are arranged along the length direction, and the plurality of first battery cells and the plurality of second battery cells are arranged in a staggered manner; the battery module comprises a top side and a bottom side which are opposite to each other in the height direction; the anti-explosion valve of the first battery cell is arranged on the top surface of the first battery cell, and the anti-explosion valve of the second battery cell is arranged on the bottom surface of the second battery cell; the top surface of the second battery cell is concave to the two adjacent first battery cells, and the bottom surface of the second battery cell is convex to the two adjacent first battery cells. According to the battery module and the power battery provided by the invention, the problem that in a battery cell arrangement mode of an existing battery module, once abnormal thermal runaway occurs in the battery cells, heat is easily transferred to adjacent battery cells, so that the heat is gathered on one side of an anti-explosion valve and subjected to chain reaction, and thermal runaway is intensified is solved.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a battery module and a power battery. Background Art

[0002] Existing power batteries adopt a thermoelectric separation design to avoid affecting the output pole when thermal runaway occurs in the battery cell. That is, the battery cell explosion-proof valve in the battery module is located on the surface away from the battery cell output pole. For example, the battery cell explosion-proof valve and the battery cell output pole are not on the same surface. The battery cell output poles are located on two surfaces in the length direction of the battery cell, and the battery cell explosion-proof valve is located on two surfaces in the width direction of the battery cell.

[0003] However, existing battery cells are arranged in the same direction when grouped, and the explosion-proof valves of adjacent battery cells are located close to each other, and the upper and lower surfaces of the battery cells are set flush. Once an abnormal thermal runaway occurs in the battery cell, the heat from the abnormal internal reaction of the battery cell and high-temperature substances will be ejected from the battery cell explosion-proof valve. The heat can be easily transferred to the adjacent battery cell, causing heat to accumulate on one side of the explosion-proof valve, resulting in a chain reaction, thereby aggravating the thermal runaway. Utility Model Content

[0004] The purpose of the present application is to provide a battery module and a power battery, thereby solving the problem that in the existing battery module cell arrangement method, once an abnormal thermal runaway occurs in a cell, the heat is easily transferred to the adjacent cell, causing heat to accumulate on one side of the explosion-proof valve, causing a chain reaction, thereby causing the thermal runaway to worsen.

[0005] According to a first aspect of the present application, a battery module is provided, which has a length direction and a height direction perpendicular to each other; the battery module includes a plurality of first battery cells and a plurality of second battery cells arranged along the length direction, and the plurality of first battery cells and the plurality of second battery cells are staggered; the battery module includes a top side and a bottom side opposite to each other in the height direction; the explosion-proof valve of the first battery cell is arranged on the top surface of the first battery cell, and the explosion-proof valve of the second battery cell is arranged on the bottom surface of the second battery cell; the top surface of the second battery cell is concave than the two adjacent first battery cells, and the bottom surface of the second battery cell is convex than the two adjacent first battery cells.

[0006] In any of the above technical solutions, further, the first battery cell and the second battery cell have the same structure.

[0007] In any of the above technical solutions, further, the height of each of the second battery cells protruding from the first battery cell accounts for 3% to 20% of the height of the first battery cell.

[0008] In any of the above technical solutions, further, the battery module also includes a plurality of isolation strips; the space formed by the top surface of the second battery cell and the two adjacent first battery cells is defined as a top groove, and the space formed by the bottom surface of the first battery cell and the two adjacent second battery cells is defined as a bottom groove; the isolation strips are provided inside the top groove and the bottom groove.

[0009] In any of the above technical solutions, further, the isolation strip is a cooling tube; a water inlet is provided at one end of each cooling tube, and a water outlet is provided at the other end of each cooling tube; external cooling water can enter from the water inlet of the cooling tube and flow out from the water outlet of the cooling tube to cool the first battery cell and the second battery cell.

[0010] In any of the above technical solutions, further, the battery module also includes a top water inlet collector, a top water outlet collector, a bottom water inlet collector and a bottom water outlet collector; the water inlets of the multiple cooling tubes arranged in the top groove are connected to the top water inlet collector, and the water outlets of the multiple cooling tubes arranged in the top groove are connected to the top water outlet collector; the water inlets of the multiple cooling tubes arranged in the bottom groove are connected to the bottom water inlet collector, and the water outlets of the multiple cooling tubes arranged in the bottom groove are connected to the bottom water outlet collector; the top water inlet collector, the top water outlet collector and the multiple cooling tubes arranged in the top groove are an integrated structure, and the top water inlet collector includes a total water inlet, and the top water outlet collector includes a total water outlet; the bottom water inlet collector, the bottom water outlet collector and the multiple cooling tubes arranged in the bottom groove are an integrated structure, and the bottom water inlet collector includes a total water inlet, and the bottom water outlet collector includes a total water outlet.

[0011] In any of the above technical solutions, further, the cooling tube arranged in the top groove is bonded to the top surface of the second battery cell; the top surface of the cooling tube arranged in the top groove is on the same plane as the top surface of the first battery cell; the cooling tube arranged in the bottom groove is bonded to the bottom surface of the first battery cell; the bottom surface of the cooling tube arranged in the bottom groove is on the same plane as the bottom surface of the second battery cell.

[0012] In any of the above technical solutions, further, the battery module also has a width direction which is perpendicular to the length direction and the height direction respectively; the first battery cell is provided with a positive electrode column and a negative electrode column on two sides opposite to each other in the width direction respectively; the second battery cell is provided with a positive electrode column and a negative electrode column on two sides opposite to each other in the width direction respectively.

[0013] According to a second aspect of the present application, a power battery is provided, comprising the battery module as described above.

[0014] In any of the above technical solutions, further, the power battery also includes an upper box and a lower box for accommodating the battery module; the upper box and the lower box are both provided with an exhaust channel corresponding to the explosion-proof valve.

[0015] In any of the above technical solutions, further, there are multiple battery modules, and the multiple battery modules are arranged in the same direction; and the exhaust channel is an exhaust groove.

[0016] According to the battery module of the present application, the battery module has a length direction and a height direction perpendicular to each other; the battery module includes a plurality of first battery cells and a plurality of second battery cells arranged along the length direction, and the plurality of first battery cells and the plurality of second battery cells are arranged alternately; the battery module includes a top side and a bottom side opposite to each other in the height direction. Among them, the explosion-proof valve of the first battery cell is arranged on the top surface of the first battery cell, and the explosion-proof valve of the second battery cell is arranged on the bottom surface of the second battery cell; the top surface of the second battery cell is concave to the two adjacent first battery cells, and the bottom surface of the second battery cell protrudes from the two adjacent first battery cells.

[0017] According to the above technical features, the beneficial effects of this application are:

[0018] Any two adjacent cells of the battery module of the present application are arranged in a staggered height (one high and one low), and the surface with the explosion-proof valve is protruding. In this way, when an abnormal thermal runaway occurs in the cell, the heat accumulated at the position of the cell explosion-proof valve will be reduced and transferred to the adjacent cell, thereby reducing the risk of thermal runaway of the adjacent cell. On this basis, the explosion-proof valves of the adjacent cells and the explosion-proof valves of the runaway cells are in opposite directions. Even if the adjacent cells are induced to have thermal runaway, the heat ejected will not gather on the same side of the cells, thereby further reducing the heat accumulation of the battery module, thereby improving safety.

[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram showing the arrangement of the first battery cell and the second battery cell of an embodiment of the present application is shown;

[0022] Figure 2 Show Figure 1 A schematic diagram of the cross-sectional structure of;

[0023] Figure 3 A schematic diagram showing the overall structure of a battery module according to an embodiment of the present application;

[0024] Figure 4 Show Figure 3 A schematic diagram of the cross-sectional structure of;

[0025] Figure 5 A schematic diagram showing the structure of a battery module installed in a lower box according to an embodiment of the present application;

[0026] Figure 6 A cross-sectional schematic diagram showing a power battery according to an embodiment of the present application;

[0027] Figure 7 A schematic diagram showing the structure of multiple battery modules installed in a lower box according to an embodiment of the present application.

[0028] Icon: 100-battery module; 101-first battery cell; 102-second battery cell; 1031-positive electrode column; 1032-negative electrode column; 1033-explosion-proof valve; 103-top groove; 104-bottom groove; 200-cooling pipe; 300-top water inlet collector; 400-top water outlet collector; 500-lower box; 501-support part; 502-exhaust channel; X-length direction; Y-width direction; Z-height direction. DETAILED DESCRIPTION

[0029] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0030] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0031] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0032] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0033] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0034] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0035] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0036] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0037] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0038] The first aspect of the present application provides a battery module, which solves the problem that in the existing battery module cell arrangement, once an abnormal thermal runaway occurs in a cell, the heat is easily transferred to the adjacent cell, causing heat to accumulate on one side of the explosion-proof valve, resulting in a chain reaction, thereby causing the thermal runaway to worsen.

[0039] The following will refer to Figures 1 to 4 A battery module according to some embodiments of the present application is described.

[0040] In the embodiments of the present application, Figure 1 As shown, the battery module 100 of the present application has a length direction X, a height direction Z, and a width direction Y that are perpendicular to each other; the battery module 100 includes a plurality of first battery cells 101 and a plurality of second battery cells 102 arranged along the length direction X, and the plurality of first battery cells 101 and the plurality of second battery cells 102 are arranged alternately; the battery module 100 includes a top side and a bottom side that are opposite to each other in the height direction Z. Among them, the explosion-proof valve 1033 of the first battery cell 101 is arranged on the top surface of the first battery cell 101, and the explosion-proof valve 1033 of the second battery cell 102 is arranged on the bottom surface of the second battery cell 102; the top surface of the second battery cell 102 is concave to the two adjacent first battery cells 101, and the bottom surface of the second battery cell 102 is protruding from the two adjacent first battery cells 101.

[0041] In summary, any two adjacent cells of the battery module of the present application are arranged in a staggered height (one high and one low), and the surface with the explosion-proof valve 1033 is protruding. In this way, when an abnormal thermal runaway occurs in the cell, the heat accumulated at the position of the cell explosion-proof valve 1033 will be reduced and transferred to the adjacent cell, thereby reducing the risk of thermal runaway of the adjacent cell. On this basis, the explosion-proof valve 1033 of the adjacent cell is opposite to the explosion-proof valve 1033 of the runaway cell. Even if the adjacent cell is induced to have thermal runaway, the heat ejected will not gather on the same side of the cell, thereby further reducing the heat accumulation of the battery module, thereby improving safety.

[0042] Optionally, in the embodiment of the present application, in order to achieve thermal and electrical separation to avoid the influence on the output pole when the battery cell has thermal runaway, as Figure 1 As shown, the positive electrode column 1031 and the negative electrode column 1032 of the first battery cell 101 of the present application can be respectively arranged on two sides of the first battery cell 101 opposite to each other in the width direction Y; the positive electrode column 1031 and the negative electrode column 1032 of the second battery cell 102 can be respectively arranged on two sides of the second battery cell 102 opposite to each other in the width direction Y.

[0043] Optionally, in order to facilitate processing and manufacturing, Figure 1 As shown, the structures of the first battery cell 101 and the second battery cell 102 of the present application can be the same, so that the first battery cell 101 and the second battery cell 102 can be staggered by simply flipping their positions ( Figure 1 In the embodiment, the exposed poles are staggered distribution of positive poles and negative poles).

[0044] Preferably, in the embodiments of the present application, Figure 2 As shown, the height of each second battery cell 102 protruding / depressed from the first battery cell 101 accounts for 3% to 20% of the height of the first battery cell 101. That is, h / H = 3% to 20%. In this way, heat transfer can be reduced and the installation of the isolation strip is convenient.

[0045] In the embodiment of the present application, in order to further reduce the heat transfer, as Figure 3 and Figure 4 As shown, the battery module 100 of the present application may also include a plurality of isolation strips. Figure 2 As shown, the space formed by the top surface of the second battery cell 102 and the two adjacent first battery cells 101 is defined as the top groove 103, and the space formed by the bottom surface of the first battery cell 101 and the two adjacent second battery cells 102 is defined as the bottom groove 104; isolation strips are provided inside the top groove 103 and the bottom groove 104. In this way, when the first battery cell 101 has thermal runaway, the heat generated by it is not easily transferred to the two adjacent second battery cells 102.

[0046] Furthermore, in order to further reduce the heat transfer, the first battery cell 101 and the second battery cell 102 are cyclically cooled. Figure 3 and Figure 4 As shown, the isolation strip can be a cooling tube 200; a water inlet is provided at one end of each cooling tube 200, and a water outlet is provided at the other end of each cooling tube 200; external cooling water can enter from the water inlet of the cooling tube 200 and flow out from the water outlet of the cooling tube 200 to cool the first battery cell 101 and the second battery cell 102.

[0047] As an example, Figure 3 As shown, the battery module 100 of the present application may also include a top water inlet current collector 300, a top water outlet current collector 400, a bottom water inlet current collector and a bottom water outlet current collector. The water inlets of the multiple cooling tubes 200 disposed in the top groove 103 are connected to the top water inlet current collector 300, and the water outlets of the multiple cooling tubes 200 disposed in the top groove 103 are connected to the top water outlet current collector 400.

[0048] In this embodiment, in order to facilitate processing and manufacturing, the top water inlet current collector 300, the top water outlet current collector 400 and the plurality of cooling pipes 200 disposed in the top groove 103 are an integrated structure, that is, formed in a "ladder" shape. In addition, the top water inlet current collector 300 includes a total water inlet, and the top water outlet current collector 400 includes a total water outlet, which circulates water through the cooling system outside the power battery.

[0049] Similarly, the water inlets of the multiple cooling tubes 200 arranged in the bottom groove 104 are connected to the bottom water inlet collector, and the water outlets of the multiple cooling tubes 200 arranged in the bottom groove 104 are connected to the bottom water outlet collector; the bottom water inlet collector, the bottom water outlet collector and the multiple cooling tubes 200 arranged in the bottom groove 104 are an integrated structure, and the bottom water inlet collector includes a total water inlet, and the bottom water outlet collector includes a total water outlet.

[0050] Preferably, in the embodiment of the present application, the cooling tube 200 disposed in the top groove 103 is bonded to the top surface of the second battery cell 102 by adhesive. The two first battery cells 101 adjacent to the second battery cell 102 are bonded to the cooling tube 200 with less adhesive, or even no adhesive is applied, which reduces heat transfer and improves safety on the one hand, and prevents overflow of adhesive from blocking the explosion-proof valve 1033 on the other hand.

[0051] In addition, in order to facilitate the installation of the cooling tube 200 and the grouping volume of the battery module 100 , preferably, the top surface of the cooling tube 200 disposed in the top groove 103 is on the same plane as the top surface of the first battery cell 101 .

[0052] Similarly, the cooling tube 200 arranged in the bottom groove 104 is bonded to the bottom surface of the first battery cell 101; the two second battery cells 102 adjacent to the first battery cell 101 are bonded to the cooling tube 200 with less adhesive, or even no adhesive is applied, and the bottom surface of the cooling tube 200 arranged in the bottom groove 104 is on the same plane as the bottom surface of the second battery cells 102.

[0053] According to a second aspect of the present application, a power battery is provided, comprising the battery module 100 as described above.

[0054] Furthermore, if Figure 6 As shown, the power battery also includes an upper box body and a lower box body 500 ( Figure 6 1034 shows the state after the upper box body and the lower box body 500 are installed). The upper box body and the lower box body 500 are both provided with an exhaust passage 502 corresponding to the explosion-proof valve 1033.

[0055] As an example, Figure 5 and Figure 6 As shown, two rows of explosion-proof valves 1033 are provided on the top and bottom surfaces of each battery module 100 , and the corresponding upper box body and lower box body 500 are provided with two exhaust channels 502 .

[0056] As an example, Figure 5 and Figure 6 As shown, the exhaust channel 502 can be an exhaust groove. Specifically, the support portion 501 of the bottom plate of the lower box body 500 is used to support the battery module 100, and the exhaust groove formed on the bottom plate serves as the exhaust channel 502 for evacuating the smoke and high-temperature substances discharged from the battery cell.

[0057] Similarly, the support portion 501 of the top plate of the upper box body is used to support the battery module 100 , and the exhaust groove formed on the top plate serves as an exhaust channel 502 .

[0058] Preferably, a flame retardant and heat insulating material may be attached to the inner surface of the exhaust groove to prevent the box from being broken due to the ejection of the battery cell and high temperature.

[0059] Furthermore, in order to increase the capacity of the power battery, Figure 7 As shown, the battery module 100 can be multiple ( Figure 7 ), a plurality of battery modules 100 are arranged along the width direction Y, and a plurality of corresponding exhaust grooves are also arranged.

[0060] In summary, any two adjacent cells of the battery module of the present application are arranged in a staggered height (one high and one low), and the surface with the explosion-proof valve is protruding. In this way, when an abnormal thermal runaway occurs in the cell, the heat accumulated at the position of the cell explosion-proof valve will be reduced and transferred to the adjacent cell, thereby reducing the risk of thermal runaway of the adjacent cell. On this basis, the explosion-proof valves of the adjacent cells and the explosion-proof valves of the runaway cells are in opposite directions. Even if the adjacent cells are induced to have thermal runaway, the heat ejected will not gather on the same side of the cells, thereby further reducing the heat accumulation of the battery module, thereby improving safety.

[0061] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. A battery module, characterized in that: The battery module has a length direction and a height direction that are perpendicular to each other; The battery module comprises a plurality of first battery cells and a plurality of second battery cells arranged along the length direction, and the plurality of first battery cells and the plurality of second battery cells are arranged alternately; The battery module includes a top side and a bottom side opposite to each other in the height direction; The explosion-proof valve of the first battery cell is arranged on the top surface of the first battery cell, and the explosion-proof valve of the second battery cell is arranged on the bottom surface of the second battery cell; The top surface of the second battery cell is concave relative to the two adjacent first battery cells, and the bottom surface of the second battery cell is protruding relative to the two adjacent first battery cells.

2. The battery module according to claim 1, characterized in that: The first battery cell and the second battery cell have the same structure.

3. The battery module according to claim 2, characterized in that: The height of each of the second battery cells protruding from the first battery cell accounts for 3% to 20% of the height of the first battery cell.

4. The battery module according to claim 1, characterized in that: The battery module also includes a plurality of isolation bars; A space formed by a top surface of the second battery cell and two adjacent first battery cells is defined as a top groove, and a space formed by a bottom surface of the first battery cell and two adjacent second battery cells is defined as a bottom groove; The isolation strips are disposed inside the top groove and the bottom groove.

5. The battery module according to claim 4, characterized in that: The isolation strip is a cooling tube; One end of each cooling tube is provided with a water inlet, and the other end of each cooling tube is provided with a water outlet; External cooling water can enter from the water inlet of the cooling pipe and flow out from the water outlet of the cooling pipe to cool the first battery core and the second battery core.

6. The battery module according to claim 5, characterized in that: The battery module also includes a top water inlet current collector, a top water outlet current collector, a bottom water inlet current collector and a bottom water outlet current collector; The water inlets of the plurality of cooling pipes disposed in the top groove are connected to the top water inlet current collector, and the water outlets of the plurality of cooling pipes disposed in the top groove are connected to the top water outlet current collector; The water inlets of the plurality of cooling pipes arranged in the bottom groove are connected to the bottom water inlet current collector, and the water outlets of the plurality of cooling pipes arranged in the bottom groove are connected to the bottom water outlet current collector; The top water inlet current collector, the top water outlet current collector and the plurality of cooling pipes arranged in the top groove are an integrated structure, and the top water inlet current collector includes a total water inlet, and the top water outlet current collector includes a total water outlet; The bottom water inlet current collector, the bottom water outlet current collector and the plurality of cooling tubes arranged in the bottom groove are an integrated structure, and the bottom water inlet current collector includes a total water inlet, and the bottom water outlet current collector includes a total water outlet.

7. The battery module according to claim 6, characterized in that: The cooling tube disposed in the top groove is bonded to the top surface of the second battery core; The top surface of the cooling tube disposed in the top groove is on the same plane as the top surface of the first battery cell; The cooling tube disposed in the bottom groove is bonded to the bottom surface of the first battery cell; The bottom surface of the cooling tube arranged in the bottom groove is on the same plane as the bottom surface of the second battery core.

8. The battery module according to any one of claims 1 to 7, characterized in that: The battery module also has a width direction perpendicular to the length direction and the height direction respectively; The first battery cell is provided with a positive electrode column and a negative electrode column on two sides opposite to each other in the width direction; The second battery cell is provided with a positive electrode column and a negative electrode column on two sides opposite to each other in the width direction.

9. A power battery, characterized in that: Comprising a battery module as claimed in any one of claims 1 to 8; The power battery also includes an upper box and a lower box for accommodating the battery module; The upper box body and the lower box body are both provided with exhaust passages corresponding to the explosion-proof valves.

10. The power battery according to claim 9, characterized in that: There are multiple battery modules, and the multiple battery modules are arranged in the same direction; The exhaust passage is an exhaust groove.

Images