CN212517351U - Battery module and battery pack - Google Patents
Battery module and battery pack Download PDFInfo
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- CN212517351U CN212517351U CN202021476019.0U CN202021476019U CN212517351U CN 212517351 U CN212517351 U CN 212517351U CN 202021476019 U CN202021476019 U CN 202021476019U CN 212517351 U CN212517351 U CN 212517351U
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- battery
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- battery module
- resistor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The application relates to the field of batteries, discloses a battery module and battery package, include: the battery comprises a battery shell assembly, a wiring harness board assembly and a protective resistor; the battery shell assembly is electrically connected with the wiring harness board assembly through a protection resistor; the protection resistor breaks the electrical connection of the harness plate assembly with the battery case assembly when the current through the protection resistor exceeds a threshold value. The battery module is provided with a plurality of batteries, each battery comprises a battery shell assembly, an outer insulating film of the battery and other battery parts, and the batteries are connected in series and parallel through the wiring harness board assembly. The battery shell assembly is electrically connected with the wiring harness plate assembly through the protection resistor, and when the current passing through the protection resistor exceeds a threshold value, the protection resistor is disconnected with the electric connection of the wiring harness plate assembly and the battery shell assembly, so that the battery shell assembly and the wiring harness plate assembly can form effective fusing protection, and the functions of equipotential corrosion prevention and insulation failure fusing protection are achieved.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery module and a battery pack.
Background
In the design of the battery, in order to ensure the corrosion resistance of the battery shell in the life cycle, the battery shell and the positive electrode are usually designed to be equipotential, that is, the shell is positively charged, and then an insulating film is pasted outside the shell to ensure the electrical safety of the battery. However, when the battery insulating film is broken, for example, the battery module is pressed, collided, or mixed with foreign matter, the battery insulating film is broken, a short circuit is formed between the series-connected batteries, and a safety risk such as ignition or thermal runaway is caused.
SUMMERY OF THE UTILITY MODEL
The application discloses battery module and battery package for when the battery insulating film is damaged, the short circuit return circuit that forms between the disconnection series connection battery avoids causing safety risks such as battery module striking sparks or thermal runaway.
In order to achieve the purpose, the application provides the following technical scheme:
the application provides a battery module, includes: the battery comprises a battery shell assembly, a wiring harness board assembly and a protective resistor;
the battery shell assembly is electrically connected with the wiring harness board assembly through the protection resistor;
when the current passing through the protection resistor exceeds a threshold value, the protection resistor disconnects the electrical connection of the wiring harness board assembly and the battery case assembly.
The battery module is provided with at least two batteries, each battery comprises a battery shell assembly, an outer battery insulating film and other battery parts, and the at least two batteries are connected in series and parallel through the wiring harness board assembly. The battery shell assembly is electrically connected with the wiring harness plate assembly through the protection resistor, and when the current passing through the protection resistor exceeds a threshold value, the protection resistor is disconnected with the electric connection of the wiring harness plate assembly and the battery shell assembly, so that the battery shell assembly and the wiring harness plate assembly can form effective fusing protection, and the functions of equipotential corrosion prevention and insulation failure fusing protection are achieved.
Therefore, the battery module can realize the safety protection function during the insulation failure on the basis of ensuring the equipotential connection between the battery anode and the battery shell assembly.
The application also provides a battery pack, which comprises any one of the battery modules.
Drawings
Fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present disclosure;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is a schematic diagram of another protection resistor shown in FIG. 2;
fig. 4 is a schematic structural diagram of a battery in a battery module according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of another battery module according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a short circuit loop in another battery module according to an embodiment of the present disclosure;
FIG. 7 is a circuit diagram of the first shorting circuit of FIG. 6;
FIG. 8 is a circuit diagram of a second shorting circuit of FIG. 6;
fig. 9 is a schematic structural diagram of a wiring board assembly in a battery module according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a battery pack according to an embodiment of the present application.
Icon: 1-a battery case assembly; 2-a wiring harness board assembly; 3-protective resistance; 4-positive electrode; 5-an insulating block; 6-external insulating film of battery; 7-an outer frame; 11-a battery cover plate; 12-a battery housing; 21-a conductive bar; 22-a harness plate; 71-a first end plate; 72-a first side panel; 73-a second end plate; 74-second side panel.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1 to 3, an embodiment of the present application provides a battery module, including: the battery comprises a battery shell assembly 1, a wiring harness board assembly 2 and a protective resistor 3; the battery shell assembly 1 is electrically connected with the wiring harness board assembly 2 through a protection resistor 3; when the current passing through the protection resistor 3 exceeds a threshold value, the protection resistor 3 disconnects the electrical connection of the harness board assembly 2 and the battery case assembly 1.
The battery module is provided with at least two batteries, each battery comprises a battery shell assembly 1, a battery outer insulating film 6 and other battery parts, and the at least two batteries are connected in series and parallel through a wiring harness board assembly 2. The battery shell assembly 1 is electrically connected with the wiring harness plate assembly 2 through the protection resistor 3, when the current passing through the protection resistor 3 exceeds a threshold value, the protection resistor 3 disconnects the wiring harness plate assembly 2 from the battery shell assembly 1, so that the battery shell assembly 1 and the wiring harness plate assembly 2 can form effective fusing protection, and the functions of equipotential corrosion prevention and insulation failure fusing protection are achieved. For example, when the battery module or the battery pack is extruded, collided, invaded by foreign matters or other abnormal conditions, and the battery insulating films between adjacent series of the battery module or the battery pack are damaged or the battery insulating films are in other conditions and are in insulation failure, a short circuit loop is formed in the battery module or the battery pack, and in the case, the protection resistor 3 is fused to disconnect the short circuit loop, so that the safety risks of ignition or thermal runaway and the like of the battery module are avoided; when abnormal conditions occur in the application of the battery module or the battery pack, for example, insulation failure between batteries at different positions and a metal shell of the battery module or a box body of the battery pack causes insulation failure between batteries at intervals of n (strings) in an electric connection loop of the battery module or the battery pack, wherein n is a positive integer greater than or equal to 1, a short circuit loop is formed in the battery module or the battery pack, and under the conditions, the protection resistor 3 can also disconnect the short circuit loop, so that safety risks such as ignition or thermal runaway of the battery module are avoided, and the safety is improved.
Therefore, the battery module can realize the safety protection function during the insulation failure on the basis of ensuring the equipotential connection between the battery positive electrode 4 and the battery shell assembly 1.
Optionally, the wire harness board assembly 2 includes a conductive bar 21 electrically connected to the positive electrode 4 of the battery in the battery module, and the conductive bar 21 is electrically connected to the battery case assembly 1 through the protection resistor 3.
In a possible implementation manner, a plurality of batteries in the battery module realize the series connection of at least two batteries through at least one conductive bar on the wiring harness board assembly to form the battery module, for example, when the battery module is formed by two batteries connected in series through two conductive bars, a first conductive bar is connected with a negative electrode of a first battery to form a negative electrode of the battery module, a second conductive bar is connected with a positive electrode of the first battery and a negative electrode of a second battery, and a third conductive bar is connected with a positive electrode of the second battery to form a positive electrode of the battery module. Referring to fig. 1 and 2, the conductive bar 21 is electrically connected to the positive electrode 4 of the battery, for example, the conductive bar 21 is welded to the positive post of the battery, so as to realize equipotential connection between the conductive bar 21 and the positive electrode 4 of the battery, and the conductive bar 21 electrically connected to the positive electrode 4 of the battery is electrically connected to the battery case assembly 1 through the protection resistor 3, that is, the battery case assembly 1 is electrically connected to the conductive bar 21 through equipotential connection, so as to realize equipotential connection between the battery case assembly 1 and the positive electrode 4 of the battery. The protection resistor 3 can realize the safety protection function when the insulation fails on the basis of ensuring the equipotential connection between the battery anode 4 and the shell. Specifically, the conductive bar 21 electrically connected with the battery anode 4 is connected with the battery shell assembly 1 through the protection resistor 3 to form an equipotential design, so that the battery shell assembly 1 is prevented from being corroded when the battery is normally used; the equipotential design in the mode is simple in structure and low in cost; the protection resistor 3 with proper resistance is selected through calculation, the precision of the equipotential connecting resistor can be accurately controlled, the protection resistor can also be selected through experience, and the protection resistor is not limited in the application.
Optionally, the conductive bar 21 and the battery case assembly 1 are respectively welded with the protection resistor 3.
In a possible implementation mode, one end of the protection resistor 3 is welded with the conductive bar 21, and the other end of the protection resistor is welded with the battery shell assembly 1, so that the battery anode 4 is connected with the shell in an equipotential manner, meanwhile, the welding enables the connection between the protection resistor 3 and the conductive bar 21 as well as the connection between the protection resistor 3 and the battery shell assembly 1 to be more stable, and the connection structure is simple.
Optionally, the protection resistor 3 is a fusible resistor.
It should be noted that when the current passing through the protection resistor 3 exceeds a threshold value, the protection resistor 3 disconnects the electrical connection between the wiring harness board assembly 2 and the battery case assembly 1, specifically, when the current passing through the protection resistor 3 exceeds the threshold value, the protection resistor 3 is fused, that is, the protection resistor 3 is a fusible resistor; when the battery module receives extrusion, collision, foreign matter invasion or other abnormal conditions to lead to the battery insulating film damaged, protection resistance 3 can be used for breaking the short circuit return circuit that will form between the series connection battery as fusing structure, avoids causing safety risks such as module striking sparks or thermal runaway.
It is understood that the main function of the protection resistor 3 is to realize electrical connection and to automatically blow when the current passing through it exceeds a threshold value, and thus any structure capable of realizing the above function can be referred to as the protection resistor 3 of the present embodiment, for example, including but not limited to a protection wire or a fuse, etc.
The protection resistor 3 may be implemented in the following manner:
in the first mode, the protection resistor 3 is a protection wire.
Specifically, in this embodiment, the material of the protection wire may be, but is not limited to, an aluminum wire, and the cross-sectional shape of the protection wire may be, but is not limited to, a circle, a square, or the like. The selection of the length L and the sectional area S of the protection lead (namely the selection of the resistance value) can be obtained by calculation according to the current (I) of a short circuit formed when the insulation of the series batteries in the battery module fails and the fusing time (t) required by design. The resistance value R of the protection wire satisfies the following relationship:
R＝(cmΔT1+KAΔT2)/I2t
wherein: c is the specific heat capacity of the protection wire, m is the mass of the protection wire, Delta T1To protect the increase in wire temperature; k is the heat dissipation coefficient of the protection wire, A is the heat dissipation area of the protection wire, Delta T2To protect the temperature difference between the wires and the heat dissipation environment; i is the current through the protection wire and t is the fusing time required to protect the wire.
In particular, the protection wire temperature rise Δ T1The protection wire is fused when the melting point of the protection wire is reached. The protection wire resistance value R, as a function of the current through the protection wire (short-circuit current), i.e., the fuse current (I) of the protection wire and the fuse time (t) required for the protection wire, is as follows:
delta T of temperature increase of protection wire1：Q＝cmΔT1
Wherein: q is the heat generated by the protection wire, c is the specific heat capacity of the protection wire, and m is the quality of the protection wire;
protection of heat generated by the wire: q ═ Q1-Q2
Wherein: q1 is the heating value of the protection lead, and Q2 is the heat dissipation value of the protection lead;
heat generation amount Q of protection wire1：Q1＝I2Rt
Wherein: r is a protective wire resistor;
heat dissipation Q of the protection wire2：
Wherein:
in order to dissipate the heat power,
(K is the heat dissipation coefficient of the protection wire, A is the heat dissipation area of the protection wire, Δ T2To protect the temperature difference between the wires and the heat dissipation environment).
The theoretical calculation formula of the protection wire design can be known from the formula, wherein the range of the fusing current I is calculated through the electric schematic diagrams of fig. 6-8 and is designed by combining experimental data, and the range of the fusing current I is 500A-8000A, specifically, but not limited to, 500A, 1000A, 1500A, 2000A, 2500A, 3000A, 3500A, 4000A, 4500A, 5000A, 5500A, 6000A, 6500A, 7000A, 7500A or 8000A; the fusing time t may be 0.01s to 10s, and may be, but is not limited to, 0.01s, 1s, 2s, 3s, 4s, 5s, 6s, 7s, 8s, 9s, or 10 s.
In the second mode, the protection resistor 3 is a fuse.
Specifically, in the method, after the loop current (I) and the fusing time (t) are calculated to determine the resistance values, the current market mature fuse parts can be used for replacing the resistance values, and the equipotential corrosion prevention and insulation failure fusing protection effects can be achieved.
And in the third mode, the protective resistor 3 is combined by a protective wire and a fuse.
Alternatively, the battery case assembly 1 includes a battery cover plate 11 and a battery case 12 connected to the battery cover plate 11.
In a possible implementation manner, referring to fig. 4, the battery case assembly 1 includes a battery cover plate 11 and a battery case 12, and the battery cover plate 11, the battery case 12, the external battery insulation film 6 and other battery components constitute a battery. The positive/negative pole column, the insulating block 5 and the battery cover plate 11 are connected in the forms of rivet connection, clamping groove limiting and the like.
Optionally, the battery module further comprises an outer frame 7, wherein the outer frame 7 comprises a first end plate 71, a first side plate 72, a second end plate 73 and a second side plate 74 which are connected in sequence, wherein the first end plate 71 is opposite to the second end plate 73, and the first side plate 72 is opposite to the second side plate 74.
In a possible way of realization, with reference to fig. 5, a plurality of batteries are welded by the conductor bars 21 to complete series-parallel connection, and the structural outer frame 7 is designed to form a battery module.
When the battery modules are squeezed, collided, invaded by foreign matters or subjected to other abnormal conditions, so that the battery insulating films between the adjacent series connection of the battery modules are damaged or the insulation of the battery modules is failed under other conditions, a short-circuit loop is formed in the battery modules, and the short-circuit loop in the condition is referred to fig. 6 and 7; ra in fig. 7: resistance between the battery anode and the shell; rb: a series connection conducting bar resistor; rc: the internal resistance of the battery; under the condition, the protection resistor 3 is fused to disconnect a short circuit loop, so that the safety risks of ignition or thermal runaway and the like of the battery module are avoided.
When abnormal conditions occur in the operation of the battery module, such as insulation failure between the batteries at different positions and the metal shell of the battery module, which results in insulation failure between the batteries at intervals of n (strings) in the electrical connection loop of the battery module, a short circuit loop is formed in the battery module, referring to fig. 6 and 8; ra in fig. 8: resistance between the battery anode and the shell; rb: a series connection conducting bar resistor; rc': n-1 batteries and the total resistance of the series-connected conducting bars thereof (wherein n is a positive integer greater than or equal to 2); under the condition, the protective resistor 3 can also disconnect a short circuit loop, so that the safety risks of ignition or thermal runaway and the like of the battery module are avoided, and the safety is improved.
Optionally, the harness board assembly 2 further comprises a harness board for mounting the conductive bar 21.
In one possible implementation, referring to fig. 9, the conductive bar 21 is mounted on a wiring harness board, and the conductive bar 21 on the wiring harness board completes series-parallel connection of a plurality of batteries.
The application also provides a battery pack, which comprises any one of the battery modules.
In a possible implementation manner, in the battery pack, referring to fig. 10, when the insulation between adjacent batteries fails, or the insulation of the batteries at different positions in the battery pack fails, the short circuit loop can be broken, so that the safety is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A battery module, comprising: the battery comprises a battery shell assembly, a wiring harness board assembly and a protective resistor;
the battery shell assembly is electrically connected with the wiring harness board assembly through the protection resistor;
when the current passing through the protection resistor exceeds a threshold value, the protection resistor disconnects the electrical connection of the wiring harness board assembly and the battery case assembly.
2. The battery module of claim 1, wherein the harness board assembly comprises a conductive bar electrically connected to a positive electrode of a battery in the battery module, the conductive bar being electrically connected to the battery case assembly through the protective resistor.
3. The battery module according to claim 2, wherein the conductive bar and the battery case assembly are welded to the protective resistor, respectively.
4. The battery module according to claim 1, wherein the protection resistor is a fusible resistor.
5. The battery module according to claim 1 or 4, wherein the protection resistor includes at least one of a protection wire and a fuse.
6. The battery module according to claim 5, wherein when the protection resistor is a protection wire, the resistance R of the protection wire satisfies the following relationship:
R＝(cmΔT1+KAΔT2)/I2t
wherein:c is the specific heat capacity of the protection wire, m is the mass of the protection wire, Delta T1To protect the increase in wire temperature; k is the heat dissipation coefficient of the protection wire, A is the heat dissipation area of the protection wire, Delta T2To protect the temperature difference between the wires and the heat dissipation environment; i is the current through the protection wire and t is the fusing time required to protect the wire.
7. The battery module according to claim 1, wherein the battery case assembly includes a battery cover plate and a battery case connected to the battery cover plate.
8. The battery module according to claim 3, further comprising an outer frame comprising a first end plate, a first side plate, a second end plate, and a second side plate connected in series, wherein the first end plate is opposite to the second end plate, and the first side plate is opposite to the second side plate.
9. The battery module of claim 3, wherein the harness plate assembly further comprises a harness plate for mounting the conductive bars.
10. A battery pack comprising the battery module according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021476019.0U CN212517351U (en) | 2020-07-23 | 2020-07-23 | Battery module and battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021476019.0U CN212517351U (en) | 2020-07-23 | 2020-07-23 | Battery module and battery pack |
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| Publication Number | Publication Date |
|---|---|
| CN212517351U true CN212517351U (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021476019.0U Active CN212517351U (en) | 2020-07-23 | 2020-07-23 | Battery module and battery pack |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115347334A (en) * | 2021-05-14 | 2022-11-15 | 中创新航科技股份有限公司 | Battery, battery module and battery pack |
| WO2023207270A1 (en) * | 2022-04-29 | 2023-11-02 | 比亚迪股份有限公司 | Battery module, nail penetration protection method for battery module, and vehicle |
-
2020
- 2020-07-23 CN CN202021476019.0U patent/CN212517351U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115347334A (en) * | 2021-05-14 | 2022-11-15 | 中创新航科技股份有限公司 | Battery, battery module and battery pack |
| WO2023207270A1 (en) * | 2022-04-29 | 2023-11-02 | 比亚迪股份有限公司 | Battery module, nail penetration protection method for battery module, and vehicle |
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| CP01 | Change in the name or title of a patent holder |
Address after: No.66, Binhe North Road, high tech Development Zone, Luoyang City, Henan Province Patentee after: CHINA AVIATION LITHIUM BATTERY Co.,Ltd. Patentee after: AVIC Innovation Technology Research Institute (Jiangsu) Co.,Ltd. Address before: No.66, Binhe North Road, high tech Development Zone, Luoyang City, Henan Province Patentee before: CHINA AVIATION LITHIUM BATTERY Co.,Ltd. Patentee before: Kaibo Energy Technology Co.,Ltd. Address after: No.66, Binhe North Road, high tech Development Zone, Luoyang City, Henan Province Patentee after: CHINA AVIATION LITHIUM BATTERY Co.,Ltd. Patentee after: Kaibo Energy Technology Co.,Ltd. Address before: No.66, Binhe North Road, high tech Development Zone, Luoyang City, Henan Province Patentee before: CHINA AVIATION LITHIUM BATTERY Co.,Ltd. Patentee before: CHINA AVIATION LITHIUM BATTERY RESEARCH INSTITUTE Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220107 Address after: 213000 No. 1, Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Patentee after: Zhongchuangxin Aviation Technology Co.,Ltd. Patentee after: AVIC Innovation Technology Research Institute (Jiangsu) Co.,Ltd. Address before: No.66, Binhe North Road, high tech Development Zone, Luoyang City, Henan Province Patentee before: CHINA AVIATION LITHIUM BATTERY Co.,Ltd. Patentee before: AVIC Innovation Technology Research Institute (Jiangsu) Co.,Ltd. |
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| TR01 | Transfer of patent right |