Battery pack

Abstract

The utility model belongs to the technical field of power batteries, and discloses a battery pack. The battery pack comprises a battery module and a box body, the battery module comprises a plurality of regularly arranged single cells, an anti-explosion valve is arranged on one side of each single cell, a containing cavity is formed in the box body, the single cells are placed in the containing cavity, a liquid receiving groove is formed in the inner wall of the bottom of the box body, and the liquid receiving groove is located between the anti-explosion valve and the side wall of the box body. And the liquid receiving tank is used for collecting the electrolyte sprayed from the anti-explosion valve. Through the arrangement, after being sprayed out from the explosion-proof valve, the electrolyte is firstly sprayed to the side walls at the two ends of the box body, then flows down along the side walls and finally flows into the liquid receiving groove at the bottom, so that the sprayed electrolyte is collected and treated through the liquid receiving groove, and the potential safety hazard that the electrolyte causes secondary damage to a single battery cell is avoided; therefore, the use safety and reliability of the whole battery pack are improved.

Description

Technical Field

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

[0002] In existing battery packs, the arrangement of battery modules is basically in a standing manner, that is, the battery cells are in a standing position and are stacked along the direction perpendicular to the larger surface of the battery cells. However, this arrangement has the following problems: 1. When there are many series-connected and parallel-connected battery cells, the expansion force of the battery module is large, making it difficult to control; 2. When a battery cell malfunctions, the electrolyte will spray upward after the valve of the battery cell is opened, and the high-temperature electrolyte is likely to cause secondary damage when it falls; 3. Most battery packs are relatively thick, making it difficult to control the thickness dimension of the battery applied to an automobile.

[0003] The prior art discloses a flat square battery module, which includes a battery cell group. The battery cell group is composed of a plurality of single battery cells with electrodes arranged on the front surface of the battery cell group side by side, so that the two large-area sides of the single battery cell face the upper and lower sides of the battery cell group respectively, and are arranged in a flat manner, so that the overall height of the square battery module is relatively low, meeting the space requirements of the battery pack on the chassis of a general passenger car. By arranging the battery cells in a smaller surface, the problem of excessive expansion force of the module is solved. Moreover, after the valve of the battery cell is opened, the spraying direction of the high-temperature electrolyte is no longer upward, avoiding secondary damage caused by the falling of the electrolyte. However, this square battery module cannot effectively treat the high-temperature electrolyte, resulting in the possibility of still having an adverse impact on the single battery cell and causing secondary damage to it.

[0004] Based on this, there is an urgent need for a battery pack to solve the problems existing in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a battery pack, which can effectively treat the ejected high-temperature electrolyte, avoid secondary damage to the single battery cell, and improve the use safety and reliability of the whole battery pack.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The battery pack includes a battery module and a box body. The battery module includes a plurality of regularly arranged single battery cells. An explosion-proof valve is arranged on one side of the single battery cell. The box body has a receiving cavity. The single battery cells are placed in the receiving cavity, and a liquid receiving groove is arranged on the inner wall of the bottom of the box body. The liquid receiving groove is located between the explosion-proof valve and the side wall of the box body, and the liquid receiving groove can collect the electrolyte ejected from the explosion-proof valve.

[0008] Preferably, a liquid storage tank is further provided on the inner wall of the bottom of the box body. Along the direction perpendicular to the valve opening direction of the explosion-proof valve horizontally, the liquid storage tank is located between the battery module and the side wall of the box body. A liquid discharge port is provided on the side wall of the box body, and the liquid discharge port is communicated with the liquid storage tank. The bottom plane of the liquid receiving tank is horizontally inclined, and the lowest point of the bottom surface of the liquid receiving tank is connected to the liquid storage tank.

[0009] Preferably, the depth h of the liquid receiving tank and the thickness H of the bottom of the box body satisfy: 2 ≤ H / h ≤ 5.

[0010] Preferably, along the valve opening direction of the explosion-proof valve, the dimension m of the box body and the dimension n of the liquid receiving tank satisfy: m / n = 34:1.

[0011] Preferably, the battery pack includes two of the battery modules, and the two battery modules are symmetrically arranged along the valve opening direction of the explosion-proof valve, so that the explosion-proof valves on the two battery modules are arranged back to back, and along the valve opening direction of the explosion-proof valve, liquid receiving grooves are provided at both ends of the bottom surface of the box body.

[0012] Preferably, the battery pack further includes a conductive column, one end of the conductive column is fixedly connected to the positive output aluminum row in one of the battery modules, and the other end of the conductive column is fixedly connected to the negative output aluminum row in the other battery module.

[0013] Preferably, a buffer heat-conducting member is clamped between adjacent single cells.

[0014] Preferably, the thickness of the buffer heat-conducting member ranges from 0.7 to 1.3 mm.

[0015] Preferably, the buffer heat-conducting member is a silica gel pad.

[0016] Preferably, along the vertical direction, a plurality of the single cells are stacked in the battery module.

[0017] The beneficial effects of the present utility model: The present utility model provides a battery pack, which includes a battery module and a box body. The battery module includes a plurality of regularly arranged single cells, and an explosion-proof valve is provided on one side of the single cell. A liquid receiving groove is provided inside the bottom of the box body, and the liquid receiving groove is located between the explosion-proof valve and the side wall of the box body. Through the above arrangement, when the electrolyte sprays out from the explosion-proof valve, it will first spray onto the side wall of the box body, and then the electrolyte will flow down along the side wall and finally flow into the liquid receiving groove, so as to collect and process the sprayed electrolyte through the liquid receiving groove, avoiding the safety hazard of the electrolyte scattering in the box body and causing secondary damage to the single cells, thereby improving the use safety and reliability of the entire battery pack. Description of the Drawings

[0018] Figure 1It is a schematic structural diagram of the battery pack provided by the present utility model;

[0019] Figure 2 It is a front view of the internal structure of the battery pack provided by the present utility model;

[0020] Figure 3 It is a schematic structural diagram of the battery pack provided by the present utility model after the cover plate is hidden;

[0021] Figure 4 It is a schematic structural diagram of the battery pack provided by the present utility model after the box body is hidden;

[0022] Figure 5 It is a sectional view of the battery pack provided by the present utility model;

[0023] Figure 6 It is Figure 5 a partial enlarged view of the position A in

[0024] Figure 7 It is a rear view of the battery pack provided by the present utility model.

[0025] In the figure:

[0026] 1. Battery module; 11. Single cell; 111. Explosion-proof valve;

[0027] 2. Box body; 201. Liquid receiving groove; 202. Liquid storage groove; 203. Drainage port; 21. Box shell; 22. Cover plate;

[0028] 3. Conductive column;

[0029] 4. Battery management unit;

[0030] 51. First socket; 52. Second socket. Specific embodiments

[0031] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model are shown in the drawings, rather than all structures.

[0032] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0033] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0034] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, 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 thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] The following will specifically introduce the technical solution provided by the present utility model in conjunction with the attached Figure 1 to the attached Figure 7 and embodiments.

[0036] Combined with Figures 1 to 3 As shown, this embodiment provides a battery pack, which includes a battery module 1 and a box body 2. Among them, the battery module includes a plurality of regularly arranged single cells 11, and an explosion-proof valve 111 is provided on one side of the single cell 11; the box body 2 includes a box shell 21 and a cover plate 22. The box shell 21 is in a box-shaped structure and has a receiving cavity capable of placing the single cells 11. After the single cells 11 and other components are installed in the box shell 21, the cover plate 22 is then buckled at the open mouth of the box shell 21 to seal and protect the battery module 1 and other components.

[0037] In this embodiment, the single cells 11 are arranged along Figure 2They are arranged side by side in the direction shown by the X-axis in the figure, that is, the monomer cells 11 in the same row are connected in a way that their smaller-area sides are in contact with each other. Through the above settings, the monomer cells 11 are placed in the box 2 in a lying state (that is, the larger-area surfaces are arranged upward or downward), thereby reducing the influence brought by the expansion force of the battery module 1. In addition, in this embodiment, the explosion-proof valves 111 of the monomer cells 11 are arranged in a horizontal state, that is, the explosion-proof valves 111 are located at one of the front and rear ends of the monomer cells 11. After the monomer cells 11 open the valves, the high-temperature electrolyte can be prevented from spraying upward, preventing secondary damage caused by the falling of the high-temperature electrolyte. Moreover, arranging the monomer cells 11 in a lying posture can effectively reduce the thickness of the overall battery module 1, so as to meet the space requirements for installing the battery pack in general automobiles.

[0038] Further, in this embodiment, as Figure 2 shown, along the vertical direction, two monomer cells 11 are stacked in the battery module 1, so as to increase the energy density of the entire battery module 1 on the basis of meeting the installation space, and effectively improve the use power of a single battery pack.

[0039] Even further, in this embodiment, as Figure 3 shown, the battery pack includes two battery modules 1. The two battery modules 1 are symmetrically arranged along the valve-opening direction of the explosion-proof valves 111 (refer to the direction shown by the Y-axis in Figure 5 the figure, that is, the electrolyte can spray out from the inside of the monomer cells 11 along the Y-axis), so that the explosion-proof valves 111 of the two battery modules 1 are arranged back to back, which not only further improves the voltage output and energy storage capacity of the battery pack, but also can avoid the influence on the use of adjacent battery modules 1 when the monomer cells 11 open the valves.

[0040] Specifically, referring to Figure 4 shown, the battery pack further includes a conductive column 3. Both ends of the conductive column 3 have threaded sections. One end of the conductive column 3 passes through the positive conductive aluminum row of one of the battery modules 1 and is threadedly connected to a nut. The other end of the conductive column 3 passes through the negative conductive aluminum row of the other battery module 1 and is threadedly connected to a nut. The two nuts respectively abut against the positive conductive aluminum row and the negative conductive aluminum row, so that the two battery modules 1 can be fixed and conductively connected through the conductive column 3, facilitating the modular assembly of the battery modules 1 in the battery pack and being beneficial to the rapid installation of the battery pack.

[0041] Optionally, in this embodiment, a buffer heat-conducting member (not shown in the figure) is further clamped between every two adjacent monomer cells 11. The buffer heat-conducting member can be selected as a silica gel pad. The silica gel pad has good elasticity and heat-conducting performance, can form a buffer layer between the monomer cells 11, reduce the extrusion force between the monomer cells 11, and at the same time can also enhance the heat transfer efficiency between the monomer cells 11 and promote the uniform distribution of heat.

[0042] It should be noted that the thickness of the buffer heat-conducting member ranges from 0.7 to 1.3 mm. For example, the value of the thickness c can be 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, or 1.3 mm. If the thickness c of the buffer heat-conducting member is less than 0.7 mm, the buffering force will be weak and unable to meet the requirements. If the thickness c of the buffer heat-conducting member is greater than 1.3 mm, it will affect the energy density of the entire battery pack and will also be limited by space and unable to be installed smoothly. Exemplarily, in this embodiment, the thickness c of the buffer heat-conducting member is 1 mm.

[0043] During the use of the battery pack, when a thermal runaway occurs in the single cell 11, the electrolyte in the high-temperature state inside the single cell 11 will rush out from the explosion-proof valve 111 and spray inside the battery pack to release the internal pressure of the single cell 11 and avoid battery explosion. In order to prevent the high-temperature electrolyte from contacting the single cell 11 and causing secondary damage, in this embodiment, combined with Figure 5 、 Figure 6 As shown, a liquid receiving groove 201 is further provided on the inner wall of the bottom of the box body 2. The liquid receiving groove 201 is located between the explosion-proof valve 111 and the side wall of the box body 2. That is, two liquid receiving grooves 201 are provided on the inner wall of the bottom of the box body 2, and the two liquid receiving grooves 201 correspond to the two battery modules 1 one by one, so that when a thermal runaway occurs in any single cell 11 in the two battery modules 1 and the explosion-proof valve 111 explodes, the ejected electrolyte can be received by the corresponding liquid receiving groove 201.

[0044] Exemplarily, the working principle of the above liquid receiving groove 201 is as follows: when the electrolyte sprays out from the explosion-proof valve 111, it will first spray onto the inner side wall of the box body 2, and then flow down along the inner side wall and finally flow into the liquid receiving groove 201 at the bottom, so as to collect and process the ejected electrolyte through the liquid receiving groove 201, avoiding environmental pollution of the electrolyte inside the battery pack and potential safety hazards to other single cells 11.

[0045] Furthermore, in this embodiment, along the valve opening direction of the explosion-proof valve 111, the dimension m of the box body 2 and the dimension n of the liquid receiving groove 201 satisfy m / n = 34:1. Exemplarily, the dimension m of the box body 2 is 510 mm, and the dimension n of the liquid receiving groove 201 is 15 mm. The value of the dimension n of the liquid receiving groove 201 can have a tolerance of ±2 mm, so that the liquid receiving groove 201 can not only have sufficient capacity to collect the electrolyte and avoid electrolyte overflow, but also avoid the placement area of the battery module 1 and ensure the energy density of the battery pack.

[0046] In this embodiment, referring to Figure 6As shown, the depth h of the liquid receiving tank 201 and the thickness H of the bottom of the box body 2 satisfy the relational expression: 2 ≤ H / h ≤ 5. Exemplarily, when the thickness H of the bottom of the box body 2 is 10 mm, the value range of the depth h of the liquid receiving tank 201 is 2 mm - 5 mm. The depth h of the liquid receiving tank 201 can be 2 mm, 3 mm, 4 mm or 5 mm. If the depth h of the liquid receiving tank 201 is less than 2 mm, the liquid receiving tank 201 is too shallow, which may lead to too low a capacity of the liquid receiving tank 201 and cause the problem of electrolyte overflow. If the depth h of the liquid receiving tank 201 is greater than 5 mm, the liquid receiving tank 201 is too deep, which will affect the structural strength of the bottom of the box body 2, easily cause deformation or even cracking, and reduce the use safety of the battery pack.

[0047] Furthermore, in combination with Figure 2 、 Figure 7 As shown, a liquid storage tank 202 is further provided on the inner wall of the bottom of the box body 2. Along the direction perpendicular to the valve opening direction of the explosion-proof valve 111 horizontally, that is, along the Figure 2 direction shown by the X-axis in Figure 2 , the liquid storage tank 202 is located between the battery module 1 and the side wall of the box body 2. In addition, a liquid discharge port 203 is provided on the side wall of the box body 2, and the liquid discharge port 203 communicates with the liquid storage tank 202. The bottom plane of the liquid receiving tank 201 is horizontally inclined, and the lowest part of the bottom surface of the liquid receiving tank 201 is connected to the liquid storage tank 202. For example, in this embodiment, the depth of the highest part of the bottom surface of the liquid receiving tank 201 is 2 mm, and the depth of the lowest part of the bottom surface of the liquid receiving tank 201 is 5 mm, so that the liquid receiving tank 201 can have a sufficient inclination to quickly transfer the electrolyte into the liquid storage tank 202 and avoid the electrolyte staying in the liquid receiving tank 201 for a long time. Through the above setting of the liquid storage tank 202, the high-temperature electrolyte can be discharged out as soon as possible, so that it will not stay near the pole columns of the single battery cells 11 in the battery pack, thereby further reducing the influence of the electrolyte on the single battery cells 11 and improving the stability and safety.

[0048] Optionally, the battery pack provided in this embodiment further includes a battery management unit 4 and a socket. Among them, the battery management unit 4 can be installed in the box body 2 through a bracket, and can monitor parameters such as the voltage, temperature, and current of the battery module 1, and perform charge and discharge control as needed to ensure the normal operation of the single battery cells 11. The socket includes a first socket 51 and a second socket 52, and the first socket 51 and the second socket 52 can be electrically connected to the battery module 1 through copper bars respectively. The battery management unit 4 and the socket are both existing parts, and will not be elaborated too much in this embodiment.

[0049] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. Battery pack, characterized in that, It includes a battery module (1) and a box body (2). The battery module (1) includes a plurality of monomer battery cells (11) arranged regularly. An explosion-proof valve (111) is provided on one side of the monomer battery cell (11). The box body (2) has a receiving cavity, and the monomer battery cells (11) are placed in the receiving cavity. A liquid receiving groove (201) is provided on the inner wall of the bottom of the box body (2). The liquid receiving groove (201) is located between the explosion-proof valve (111) and the side wall of the box body (2), and the liquid receiving groove (201) can collect the electrolyte sprayed from the explosion-proof valve (111).

2. The battery pack according to claim 1, characterized in that, A liquid storage groove (202) is also provided on the inner wall of the bottom of the box body (2). Along the direction perpendicular to the valve opening direction of the explosion-proof valve (111) horizontally, the liquid storage groove (202) is located between the battery module (1) and the side wall of the box body (2). A liquid discharge port (203) is opened on the side wall of the box body (2), and the liquid discharge port (203) communicates with the liquid storage groove (202). The bottom plane of the liquid receiving groove (201) is horizontally inclined, and the lowest point of the bottom surface of the liquid receiving groove (201) is connected to the liquid storage groove (202).

3. The battery pack according to claim 1, characterized in that, The depth h of the liquid receiving groove (201) and the thickness H of the bottom of the box body (2) satisfy: 2 ≤ H / h ≤ 5.

4. The battery pack according to claim 1, characterized in that, Along the valve opening direction of the explosion-proof valve (111), the dimension m of the box body (2) and the dimension n of the liquid receiving groove (201) satisfy: m / n = 34:

1.

5. The battery pack according to any one of claims 1-4, characterized in that, The battery pack includes two of the battery modules (1). The two battery modules (1) are symmetrically arranged along the valve opening direction of the explosion-proof valve (111) so that the explosion-proof valves (111) on the two battery modules (1) are arranged back to back. Along the valve opening direction of the explosion-proof valve (111), the liquid receiving grooves (201) are opened at both ends of the bottom surface of the box body (2).

6. The battery pack according to claim 5, characterized in that, The battery pack further includes a conductive column (3). One end of the conductive column (3) is fixedly connected to the positive output aluminum row in one of the battery modules (1), and the other end of the conductive column (3) is fixedly connected to the negative output aluminum row in the other battery module (1).

7. The battery pack according to any one of claims 1-4, characterized in that, A buffer heat-conducting member is clamped between adjacent monomer battery cells (11).

8. The battery pack according to claim 7, characterized in that, The thickness of the buffer heat-conducting member ranges from 0.7 to 1.3 mm.

9. The battery pack according to claim 7, characterized in that, The buffer heat-conducting member is a silica gel pad.

10. The battery pack according to any one of claims 1-4, characterized in that, Along the vertical direction, a plurality of the monomer battery cells (11) are stacked in the battery module (1).

Images